Centaur Automatic Setting System and Automatic Setting Method

Abstract

To provide technology allowing installation of a form for tunnel lining for installing lining concrete on an inner wall surface of a tunnel to be automated more efficiently than before.SOLUTION: A form for tunnel lining comprises: a cradle formed by connecting front gantry frames and rear gantry frames aligned with a space therebetween along a tunnel longitudinal direction; and a form body having a ceiling form supported with front ceiling beams of front gantry frames and rear ceiling beams of rear gantry frames, and an automatic setting system is provided with: a front left side lifting device and a front right side lifting device for lifting or lowering a pair of front leg parts extending downward from the front ceiling beams; and a rear left side lifting device and a rear right side lifting device for lifting or lowering a pair of rear leg parts extending downward from the rear ceiling beams; and a controller, wherein the controller transmits motion signals to each of the lifting devices based on detecting information detected with an inclination detection device to automatically carry out a leveling process allowing the front ceiling beams and the rear ceiling beams to be in a horizontal position.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an automatic setting system and an automatic setting method for a centering for placing formwork concrete on the inner wall surface of a tunnel.

Background Art

[0002] Conventionally, in the construction of formwork concrete in mountain tunnels, a centering, which is a movable formwork in which a formwork body having a cross-sectional arch shape and a gantry for supporting the formwork body are integrally movable, has been widely used. Usually, the gantry of the centering has portal frames at the front and rear in the longitudinal direction of the centering, and the front and rear portal frames are each horizontally installed in the centering width direction and have a top beam for supporting the formwork body and a pair of left and right legs extending downward from both ends of the top beam. Further, traveling wheels 29 are provided at the lower ends of the respective legs of the centering, whereby the centering can travel on a pair of left and right rails laid along the longitudinal direction of the tunnel.

[0003] In addition, the construction of formwork concrete using a centering is performed by installing an arch-shaped formwork body at a predetermined formwork setting position along the inner wall surface of the tunnel with a space between the inner wall surface of the tunnel and the formwork body, and placing concrete between the inner wall surface of the tunnel and the formwork body. After the concrete is placed, after demolding through a predetermined curing period, the centering on the rails is moved to the section (hereinafter referred to as the "newly installed formwork section") where formwork concrete is to be newly placed in the longitudinal direction of the tunnel, and then the formwork body is installed at the formwork setting position and concrete is placed in the newly installed formwork section. As described above, the construction of formwork concrete using a centering is sequentially performed from the portal side to the face side of the tunnel while repeating the movement of the centering to the newly installed formwork section, the installation of the formwork body at the formwork setting position, the placement of concrete, and demolding.

[0004] By the way, the installation position of the center line is an important factor in determining the thickness of the tunnel lining. Also, since there may be an error between the installation position of the center line and the designed alignment of the tunnel, various techniques have been developed to measure its installation position. As a method for measuring the installation position of the center line, in the vicinity of the joint position of the lining concrete, the center point of the tunnel cross-section is measured in advance, marks such as nails are clearly indicated on the top and floor of the tunnel, and the center of the center line is aligned with the marks. This method has been conventionally used.

[0005] In recent years, against the backdrop of the aging and decrease of workers, the need for automation technology to improve construction efficiency by mechanizing the construction of lining concrete using the center line has been increasing.

[0006] In this regard, a technology has also been proposed that consists of a computer storing tunnel alignment information and tunnel cross-section information, a surveying instrument capable of distance measurement and angle measurement installed in the tunnel, a plurality of sighting targets attached to the center position and circumferential position of the center line, and a portable information communication terminal capable of monitoring and displaying the calculation results by the computer. By sighting each sighting target provided on the center line with the surveying instrument and measuring their three-dimensional coordinates, the position coordinates of the center line are specified, and based on the tunnel alignment information and tunnel cross-section information in the computer, the difference between the measured value and the designed value of the position coordinates of the center line is displayed on the monitor of the portable information communication terminal (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] By the way, in a series of operations related to the construction of the covering concrete, when the center is moved to the newly established covering work area, the overhead beams in the front and rear portal frames may be inclined depending on the laying state of the rails. In such a case, it becomes a factor that requires a great deal of labor and time to install the formwork body at the formwork setting position. Therefore, after moving the center to the newly established covering work area and before installing the formwork body at the formwork setting position, the lifting cylinders installed on each leg of the front and rear portal frames are appropriately extended and retracted to level the center so that each portal frame (overhead beam) is in a horizontal position.

[0009] Conventionally, every time the center in the tunnel is moved to the newly established covering work area, it is necessary to perform three-dimensional surveying by sighting the sighting targets attached to four locations on each leg of the front and rear portal frames, and confirm the inclination state of the center based on the survey results, which actually requires a great deal of labor and time.

[0010] The present invention has been made in view of the above situation, and its purpose is to provide a technique for automating the installation of the center for placing the covering concrete on the inner wall surface of the tunnel more efficiently than before.

Means for Solving the Problem

[0011] In order to solve the above problems, the present invention provides an automatic centering system for a centering that can travel on a pair of left and right rails laid along the longitudinal direction of a tunnel and for placing formwork concrete on the inner wall surface of the tunnel. The centering includes a gantry formed by connecting a front portal frame and a rear portal frame arranged at intervals along the longitudinal direction of the tunnel to each other, and a formwork body having a top form supported by a front top beam of the front portal frame and a rear top beam of the rear portal frame. The centering operates in response to an operation signal, and includes a front left lifting device and a front right lifting device that independently lift and lower a pair of left and right front legs extending downward from the front top beam of the front portal frame, a rear left lifting device and a rear right lifting device that independently lift and lower a pair of left and right rear legs extending downward from the rear top beam of the rear portal frame, a control unit that controls these by transmitting an operation signal to each lifting device, and an inclination detection device that detects the inclination postures of the front top beam and the rear top beam. The control unit is characterized by executing a leveling process of automatically leveling the front top beam and the rear top beam by transmitting an operation signal to each lifting device based on the detection information of the inclination detection device.

[0012] Here, the automatic centering system according to the present invention further includes a first sighting target attached to either one of a pair of left and right front legs extending downward from the front top beam in the front portal frame, a second sighting target attached to either one of a pair of left and right rear legs extending downward from the rear top beam in the rear portal frame, and a surveying instrument for measuring the three-dimensional position coordinates of the first sighting target and the second sighting target. After the horizontal extension process, the control unit obtains the required upward and downward movement amounts of the first sighting target and the required upward and downward movement amounts of the second sighting target in each of the front portal frame and the rear portal frame in the tunnel vertical direction, which are calculated based on the measurement information of the surveying instrument, and transmits an operation signal corresponding to the required upward and downward movement amount of the first sighting target to the front left lifting device and the front right lifting device, and at the same time transmits an operation signal corresponding to the required upward and downward movement amount of the second sighting target to the rear left lifting device and the rear right lifting device, so as to execute the centering form height setting process for adjusting the height of the centering form.

[0013] In the automatic centering system according to the present invention, the first sighting target and the second sighting target may be respectively attached to one of the pair of left and right front legs and the pair of left and right rear legs on the same side in the tunnel width direction.

[0014] The automatic centering system according to the present invention further includes a traveling device that operates in response to an operation signal and travels the gantry along the rails. Before the horizontal extension process, the control unit obtains the required forward and backward movement amounts of the gantry in the tunnel longitudinal direction, which are calculated based on the measurement information of the surveying instrument, and transmits an operation signal corresponding to the required forward and backward movement amounts to the traveling device, so as to execute the centering front and rear position setting process for automatically matching the position of the centering in the tunnel longitudinal direction with a predetermined newly installed lining position.

[0015] In addition, the automatic centering system according to the present invention further includes a first lateral feed device that operates in response to an operation signal and laterally feeds the front portal frame in the tunnel width direction, and a second lateral feed device that laterally feeds the rear portal frame in the tunnel width direction. The control unit acquires a first left-right required movement amount and a second left-right required movement amount in each of the front portal frame and the rear portal frame in the tunnel width direction calculated based on the measurement information of the surveying instrument after the horizontal extension process and before the centering top form height setting process, and transmits an operation signal corresponding to the first left-right required movement amount to the first lateral feed device and an operation signal corresponding to the second left-right required movement amount to the second lateral feed device, so as to perform a centering left-right position setting process for automatically matching the position in the tunnel width direction of the centering with the newly constructed lining position. It may be configured as such.

[0016] In addition, the automatic centering system according to the present invention further includes a computer in which tunnel information including tunnel linear information and cross-sectional information is stored. When the centering front-rear position setting process is executed, the computer transmits the front-rear required movement amount calculated based on the measurement information of the surveying instrument and the tunnel information to the control unit. When the centering left-right position setting process is executed, the computer transmits the first collimation target left-right required movement amount and the second collimation target left-right required movement amount calculated based on the measurement information of the surveying instrument and the tunnel information to the control unit. When the centering top form height setting process is executed, the computer transmits the first collimation target up-down required movement amount and the second collimation target up-down required movement amount calculated based on the measurement information of the surveying instrument and the tunnel information to the control unit. It may be configured as such.

[0017] Here, the inclination detection device includes a front girder detection unit provided at a position corresponding to the front girder in the center front-rear direction and detecting the inclination posture of the front girder, and a rear girder detection unit provided at a position corresponding to the rear girder in the center front-rear direction and detecting the inclination posture of the rear girder. Each of the front girder detection unit and the rear girder detection unit may include an air-open type liquid tank provided on one side in the center width direction, a pressure gauge provided on the other side in the center width direction, and a communication pipe connecting the liquid tank and the pressure gauge.

[0018] Furthermore, in each of the front girder inclination detection unit and the rear girder detection unit, the liquid tank and the pressure gauge are provided at positions substantially symmetric with respect to the center line in the center width direction, and a first length dimension along the center width direction from the liquid tank to the center line in the front girder detection unit and a second length dimension along the center width direction from the liquid tank to the center line in the rear girder detection unit may be provided to be substantially equal.

[0019] Also, the inclination detection device is provided at a position corresponding to the front girder in the center front-rear direction and includes a first pressure gauge and a second pressure gauge each provided at a position substantially symmetric with respect to the center line in the center width direction, a third pressure gauge and a fourth pressure gauge each provided at a position corresponding to the rear girder in the center front-rear direction and at a position substantially symmetric with respect to the center line in the center width direction, a single air-open type liquid tank, and communication pipes connecting each of the first to fourth pressure gauges and the liquid tank. The width direction interval along the center width direction from the first pressure gauge to the center line and the width direction interval along the center width direction from the third pressure gauge to the center line are substantially equal, the first pressure gauge and the second pressure gauge and the third pressure gauge and the fourth pressure gauge are provided at positions substantially symmetric with respect to the center line in the center front-rear direction, and the first to fourth pressure gauges may be provided at the same height position.

[0020] Further, the centering member is a receiving member that protrudes rearward from a rear end region facing the nearest lining work section side of the tunnel in the formwork, and is formed at a position a certain amount inward from the outer peripheral surface of the formwork and has a support surface extending along the circumferential direction of the formwork. The centering member further includes a joint member that is disposed on the outer peripheral surface of the rear end side of the formwork and is movable toward a notch formed in the inner circumference of the front end portion of the existing lining concrete in the nearest lining work section. The joint member has a bottom surface that is movable along the front-rear direction on the outer peripheral surface of the formwork, and a support leg portion that protrudes from the rear end side of the bottom surface toward the support surface of the receiving member. By moving the joint member and inserting a part thereof into the notch, a protruding portion that follows the concave cross-sectional shape of the joint formed in the joint of the lining concrete may be formed at the boundary between the front end portion of the existing lining concrete in the nearest lining work section and the placement space of the new lining concrete.

[0021] Further, the side surface of the joint member may be formed into an inclined surface following the notch.

[0022] Further, a cushion body with a predetermined thickness may be provided on the support surface of the receiving member.

[0023] Further, the present invention may be specified as an automatic setting method for a centering member that can travel on a pair of left and right rails laid along the longitudinal direction of the tunnel and is used to place lining concrete on the inner wall surface of the tunnel. That is, the automatic setting method for the centering member according to the present invention is characterized in that the control unit executes a leveling process of automatically setting the front overhead beam and the rear overhead beam in a horizontal posture by transmitting an operation signal to each lifting device based on the detection information of the inclination detection device.

Advantages of the Invention

[0024] According to the present invention, it is possible to provide a technique for more efficiently automating the installation of a centering member for placing lining concrete on the inner wall surface of a tunnel compared to the prior art.

Brief Description of the Drawings

[0025]

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MODE FOR CARRYING OUT THE INVENTION

[0026] Next, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are examples for implementing the present invention, and the present invention is not limited to the aspects described below.

[0027] <Embodiment 1> FIG. 1 is a diagram for explaining an automatic setting system of the center E according to Embodiment 1.

[0028] The center E is a movable formwork used for placing covering concrete on the inner wall surface F (see FIG. 2) of the tunnel C. The center E is a so-called slide center, which can travel on a pair of left and right rails laid along the longitudinal direction of the tunnel C (hereinafter referred to as the "tunnel longitudinal direction"), and covering concrete can be continuously placed on the inner wall surface F of the tunnel C along the tunnel longitudinal direction. In the present embodiment, the placing progress direction of the covering concrete is set to be the direction from the portal side to the face side of the tunnel C. In the present embodiment, the placing progress direction of the covering concrete is set to be the direction from the portal side to the face side of the tunnel C.

[0029] The center E includes a formwork body 1 having an arch shape (substantially cylindrical shape) in a cross-sectional view perpendicular to the tunnel longitudinal direction, and a movable gantry 2 that supports the formwork body 1. Hereinafter, in this specification, a cross-section perpendicular to the tunnel longitudinal direction of the tunnel C is referred to as a "tunnel cross-section". In FIG. 1, the width direction (hereinafter referred to as the "tunnel width direction") and the height direction (hereinafter referred to as the "tunnel height direction (tunnel vertical direction)") of the tunnel C are illustrated. In this specification, the "front-rear direction" of the center E corresponds to the tunnel longitudinal direction, the "width direction (left-right direction)" of the center E corresponds to the tunnel width direction, and the "height direction (vertical direction)" of the center E corresponds to the tunnel height direction. In this specification, the center E is described by taking as an example the case where its front side (front surface side) faces the face side of the tunnel C and its back side (rear surface side) faces the portal side of the tunnel C. In this specification, the left-right direction of the center E is defined based on the left-right direction when looking at the center E from the portal side.

[0030] As shown in FIG. 1, the center E has an operation panel 6 as a control device for driving and controlling various devices provided in the center E. In the example shown in FIG. 1, the operation panel 6 is attached to the front side of the center E, but the installation position of the operation panel 6 is not particularly limited.

[0031] FIG. 2 is a diagram for explaining the center E in a state where it is installed at a predetermined formwork setting position.

[0032] Referring to FIGS. 1 and 2, the schematic configuration of the center E will be described. The gantry 2 includes a front portal frame 20A and a rear portal frame 20B that are arranged at intervals along the longitudinal direction of the tunnel. The front portal frame 20A and the rear portal frame 20B are frame structures formed in a portal shape by appropriately combining steel sections and the like, and are integrally connected to each other by a structural frame or the like extending along the longitudinal direction of the tunnel.

[0033] The front portal frame 20A and the rear portal frame 20B have substantially the same structure. The front portal frame 20A is provided at the front part (front side) of the center E, and the rear portal frame 20B is provided at the rear part (rear side) of the center E. The front portal frame 20A includes a front top beam 23 extending in the width direction (left - right direction) of the center E, and a pair of left and right front legs 21, 22 extending downward from the front top beam 23. Hereinafter, reference numeral 21 will be referred to as the "front right leg", and reference numeral 22 will be referred to as the "front left leg". The upper ends of the front left leg 22 and the front right leg 21 are connected to the left and right ends of the front top beam 23, and the front top beam 23 is supported by the front right leg 21 and the front left leg 22 so as to span therebetween. Similarly, the rear portal frame 20B includes a rear top beam 26 extending in the width direction (left - right direction) of the center E, and a pair of left and right rear legs 24, 25 extending downward from the rear top beam 26. Hereinafter, reference numeral 24 will be referred to as the "rear right leg", and reference numeral 25 will be referred to as the "rear left leg". The upper ends of the rear left leg 25 and the rear right leg 24 are connected to the left and right ends of the rear top beam 26, and the rear top beam 26 is supported by the rear right leg 24 and the rear left leg 25 so as to span therebetween.

[0034] In addition, at the lower ends of the front right foot portion 21, the front left foot portion 22, the rear right foot portion 24, and the rear left foot portion 25, first to fourth traveling devices 5A, 5B, 5C, 5D each having traveling wheels 29 for traveling on a pair of left and right rails TR, TR are provided. In the present embodiment, the traveling wheels 29 of the first traveling device 5A in the front right foot portion 21 and the second traveling device 5B in the front left foot portion 22 serve as drive wheels, and an electric drive unit for driving the traveling wheels 29 (drive wheels) is provided in the first traveling device 5A and the second traveling device 5B. However, a hydraulic drive unit may be applied instead of the electric drive unit. Of course, the traveling wheels 29 of the third traveling device 5C and the fourth traveling device 5D may also serve as drive wheels.

[0035] In the present embodiment, when the first traveling device 5A and the second traveling device 5B are activated by an activation signal from the operation panel 6, the respective traveling wheels 29 of the first traveling device 5A and the second traveling device 5B are rotationally driven in the forward and reverse directions according to the activation signal. As a result, the gantry 2 of the center E moves forward (moves forward) or backward (moves backward) along the tunnel longitudinal direction on the rails TR, TR. Here, the forward movement (forward movement) refers to the movement of the center E to the face side along the tunnel longitudinal direction, and the backward movement (backward movement) refers to the movement of the center E to the portal side along the tunnel longitudinal direction.

[0036] Among the first to fourth traveling devices 5A to 5D, at least one of the traveling wheels 29 is provided with a traveling amount detection sensor (not shown) for detecting the traveling amount of the traveling wheel 29. The traveling amount detection sensor may be configured to include, for example, a rotary encoder capable of detecting the rotational position of the traveling wheel 29. The detection signal detected by the traveling amount detection sensor is sequentially transmitted to the operation panel 6. The operation panel 6 controls the first traveling device 5A and the second traveling device 5B having drive wheels based on the detection signal received from the traveling amount detection sensor.

[0037] Here, between the front right leg portion 21 and the first traveling device 5A, a front right side lateral feed device 4A and a front right side elevating device 3A connected to the upper portion of the front right side lateral feed device 4A are provided. Also, between the front left leg portion 22 and the second traveling device 5B, a front left side lateral feed device 4B and a front left side elevating device 3B connected to the upper portion of the front left side lateral feed device 4B are provided. Further, between the rear right leg portion 24 and the third traveling device 5C, a rear right side lateral feed device 4C and a rear right side elevating device 3C connected to the upper portion of the rear right side lateral feed device 4C are provided. Additionally, between the rear left leg portion 25 and the fourth traveling device 5D, a rear left side lateral feed device 4D and a rear left side elevating device 3D connected to the upper portion of the rear left side lateral feed device 4D are provided. These elevating devices 3A to 3D and lateral feed devices 4A to 4D operate in response to actuation signals sent from the operation panel 6.

[0038] Each of the elevating devices 3A to 3D has a drive cylinder that can expand and contract along the center height direction, and can expand and contract (elevate and lower) the front, rear, left, and right leg portions 21, 22, 24, 25 along the center height direction. In this embodiment, since the elevating devices 3A to 3D are respectively provided on the front, rear, left, and right leg portions 21, 22, 24, 25, the front, rear, left, and right leg portions 21, 22, 24, 25 can be independently expanded and contracted (elevated and lowered) in the center height direction. More specifically, by the operation of the front right side elevating device 3A provided on the front right leg portion 21 and the front left side elevating device 3B provided on the front left leg portion 22, the front overhead beam 23 can be elevated and lowered along the tunnel height direction, or the inclination (posture) of the front overhead beam 23 with respect to the horizontal direction can be adjusted. Similarly, by the operation of the rear right side elevating device 3C provided on the rear right leg portion 24 and the rear left side elevating device 3D provided on the rear left leg portion 25, the rear overhead beam 26 can be elevated and lowered along the tunnel height direction, or the inclination (posture) of the rear overhead beam 26 with respect to the horizontal direction can be adjusted.

[0039] In addition, each of the cross-feed devices 4A to 4D has a drive cylinder that can expand and contract along the center width direction (tunnel width direction), and can slide the front, rear, left, and right legs 21, 22, 24, and 25 along the center width direction (tunnel width direction), thereby enabling the front overhead beam 23 and the rear overhead beam 26 to slide along the center width direction (tunnel width direction). In some cases, the front right cross-feed device 4A and the front left cross-feed device 4B, which can slide the front overhead beam 23 along the tunnel width direction, may be collectively referred to as the "first cross-feed device". Also, in some cases, the rear right cross-feed device 4C and the rear left cross-feed device 4D, which can slide the rear overhead beam 26 along the tunnel width direction, may be collectively referred to as the "second cross-feed device".

[0040] In this embodiment, the drive cylinders in each of the lifting devices 3A to 3D and each of the cross-feed devices 4A to 4D are hydraulic, but they may also be electric. Also, each of the lifting devices 3A to 3D and each of the cross-feed devices 4A to 4D are provided with extension position detection sensors (not shown) for detecting the extension positions of the respective drive cylinders. Each extension position detection sensor may be configured to include, for example, a linear encoder capable of detecting the extension position of each drive cylinder. The detection signals detected by each extension position detection sensor are sequentially transmitted to the operation panel 6. The operation panel 6 controls each of the lifting devices 3A to 3D and the cross-feed devices 4A to 4D based on the detection signals received from each extension position detection sensor.

[0041] Next, the arch-shaped formwork body 1 supported by the gantry 2 will be described. The formwork body 1 includes a top form 11 supported by the front overhead beam 23 of the front portal frame 20A and the rear overhead beam 26 of the rear portal frame 20B, a pair of side forms 12 whose upper ends are rotatably connected to both ends of the top form 11, and a pair of inverted forms 13 whose upper ends are rotatably connected to the lower ends of the respective side forms 12.

[0042] As shown in Fig. 2, the top form 11 is positioned at the top of the arch-shaped formwork body 1 and is a formwork area for forming the arch part (top end part) of the covering concrete. Also, the pair of side forms 12 are positioned at the sides of the arch-shaped formwork body 1 and are formwork areas for forming the side wall parts of the covering concrete. Further, the pair of invert forms 13 are positioned at the lower part of the arch-shaped formwork body 1 and are formwork areas for forming the invert part of the covering concrete. In the example shown in Fig. 2, the pair of invert forms 13 are arranged at a position below the spring line SL in the tunnel C. Also, the rotation axes at the connecting parts of the top form 11 and the side forms 12 and the rotation axes at the connecting parts of the side forms 12 and the invert forms 13 are provided parallel to the centroid front-rear direction (tunnel longitudinal direction).

[0043] Here, on the front portal frame 20A of the gantry 2, a pair of driving cylinders 71 for side forms are respectively arranged so as to be rotatable around a rotation axis parallel to the centroid front-rear direction (tunnel longitudinal direction) with respect to the lower regions of the pair of side forms 12 in the formwork body 1, the front right leg part 21, and the front left leg part 22. Similarly, for the rear portal frame 20B of the gantry 2, a pair of driving cylinders 71 for side forms are respectively arranged so as to be rotatable around a rotation axis parallel to the centroid front-rear direction (tunnel longitudinal direction) with respect to the lower regions of the pair of side forms 12 in the formwork body 1, the rear right leg part 24, and the rear left leg part 25. Also, one end of each driving cylinder 71 for side forms is connected to a part above each of the lifting devices 3A to 3D in the front, rear, left, and right leg parts 21, 22, 24, 25.

[0044] Furthermore, in the center E in the present embodiment, both ends of the driving cylinder 72 for the invert form are connected to the inside of each side form 12 in the formwork body 1 and each invert form 13 rotatably connected to the side form 12. As shown in FIG. 1, a total of four driving cylinders 72 for the invert form are provided. For example, a pair is provided on the left and right in the vicinity of the position corresponding to the front portal frame 20A along the center front-rear direction (tunnel longitudinal direction), and a pair is provided on the left and right in the vicinity of the position corresponding to the rear portal frame 20B.

[0045] Also, the driving cylinder 72 for the invert form rotatably connects a portion above the lower end of the side form 12 and a portion below the upper end of the invert form 13 around a rotation axis parallel to the center front-rear direction (tunnel longitudinal direction). Each of the driving cylinders 71 and 72 can be operated by an operation signal received from the operation panel 6, and an extension position detection sensor (not shown) for detecting the extension position is attached to each of the driving cylinders 71 and 72.

[0046] By extending each driving cylinder 71 to the value of the signal by the operation signal from the operation panel 6, the side form 12 in the formwork body 1 can be expanded in diameter, and the side form 12 can be brought closer to the inner wall surface F of the tunnel C. Conversely, by contracting each driving cylinder 71, the side form 12 in the formwork body 1 can be reduced in diameter, and the side form 12 can be moved away from the inner wall surface F of the tunnel C. Similarly, by extending each driving cylinder 72 to the value of the signal by the operation signal from the operation panel 6, the invert form 13 in the formwork body 1 can be expanded in diameter, and the invert form 13 can be brought closer to the inner wall surface F of the tunnel C. Conversely, by contracting each driving cylinder 72, the invert form 13 can be reduced in diameter, and the invert form 13 can be moved away from the inner wall surface F of the tunnel C.

[0047] Furthermore, the center E in the present embodiment includes an inclination detection device that detects the inclination postures of the front top beam 23 in the front portal frame 20A and the rear top beam 26 in the rear portal frame 20B. As shown in FIG. 1, the inclination detection device in the present embodiment includes a front top beam inclination detection unit 8A that detects the inclination posture of the front top beam 23 in the front portal frame 20A, and a rear top beam inclination detection unit 8B that detects the inclination posture of the rear top beam 26 in the rear portal frame 20B. The front top beam inclination detection unit 8A and the rear top beam inclination detection unit 8B have substantially the same structure, and each includes an air-open type liquid tank provided on one side in the center width direction, a pressure gauge provided on the other side in the center width direction, and a communication pipeline that communicates these liquid tank and pressure gauge.

[0048] Specifically, the front top beam inclination detection unit 8A includes an air-open type liquid tank 81 provided at a position corresponding to the front top beam 20A in the front-rear direction of the center (tunnel longitudinal direction), a pressure gauge 82, and a communication pipeline 83 that communicates the liquid tank 81 and the pressure gauge 82. The liquid tank 81 is provided on one side in the center width direction (the right side of the center E in the examples shown in FIGS. 1 and 2), and the pressure gauge 82 is provided on the other side in the center width direction (the left side of the center E in the examples shown in FIGS. 1 and 2). The liquid tank 81 in the front top beam inclination detection unit 8A is attached to a support column 231 that supports the front end side of the top form 11 and stands upright upward from the right end side in the center width direction of the front top beam 23. On the other hand, the pressure gauge 82 in the front top beam inclination detection unit 8A is attached to a support column 232 that supports the front end side of the top form 11 and stands upright upward from the left end side in the center width direction of the front top beam 23. The liquid tank 81 and the pressure gauge 82 in the front top beam inclination detection unit 8A communicate with each other through the communication pipeline 83 arranged along the front top beam 23. Further, the liquid tank 81 in the front top beam inclination detection unit 8A is installed at a position higher than the pressure gauge 82.

[0049] Further, the rear roof beam inclination detection unit 8B includes an open-air liquid tank 81 provided at a position corresponding to the rear roof beam 26 in the vehicle center longitudinal direction, a pressure gauge 82, and a communication pipeline 83 that connects the liquid tank 81 and the pressure gauge 82. The liquid tank 81 is provided on one side in the vehicle center width direction (the right side of the vehicle center E in the examples shown in FIGS. 1 and 2), and the pressure gauge 82 is provided on the other side in the vehicle center width direction (the left side of the vehicle center E in the examples shown in FIGS. 1 and 2). The liquid tank 81 in the rear roof beam inclination detection unit 8B is attached to a support column 261 that supports the rear end side of the roof form 11 and stands upright upward from the right end side in the vehicle center width direction of the rear roof beam 26. On the other hand, the pressure gauge 82 in the rear roof beam inclination detection unit 8B is attached to a support column 262 that supports the rear end side of the roof form 11 and stands upright upward from the left end side in the vehicle center width direction of the rear roof beam 26. The liquid tank 81 and the pressure gauge 82 communicate with each other via the communication pipeline 83 arranged along the rear roof beam 26. Further, the liquid tank 81 in the rear roof beam inclination detection unit 8B is installed at a position higher than the pressure gauge 82.

[0050] In this embodiment, each liquid tank 81 in the front roof beam inclination detection unit 8A and the rear roof beam inclination detection unit 8B is a water tank, and water is stored therein, but other liquids may be stored therein instead. Also, the material constituting each communication pipeline 83 in the front roof beam inclination detection unit 8A and the rear roof beam inclination detection unit 8B is not particularly limited, but when adjusting the inclination (posture) of the front roof beam 23 and the rear roof beam 26 with respect to the horizontal direction, it is preferably formed of a hose member or the like having flexibility such that it can follow the movement of the front roof beam 23 and the rear roof beam 26.

[0051] In the present embodiment, the liquid tank 81 and the pressure gauge 82 in the front roof beam inclination detector 8A are provided at positions substantially symmetric with respect to the center line (hereinafter referred to as the "center width direction center line") L1 in the center width direction (see FIG. 3), and the liquid tank 81 and the pressure gauge 82 in the rear roof beam inclination detector 8B are provided at positions substantially symmetric with respect to the center width direction center line L1. Further, the first length dimension from the center width direction center line L1 to the liquid tank 81 in the front roof beam inclination detector 8A along the center width direction and the second length dimension from the center line in the center width direction to the liquid tank 82 in the rear roof beam inclination detector 8B along the center width direction are provided to be substantially equal to each other.

[0052] FIG. 3 is a diagram for explaining the magnitude of the detection value of the pressure gauge 82 in the front roof beam inclination detector 8A (rear roof beam inclination detector 8B) corresponding to the front roof beam 23 (rear roof beam 26). FIG. 3(a) shows a state in which the posture of the front roof beam 23 (rear roof beam 26) is inclined downward from the right end side (left side in FIG. 3(a)) to the left end side (right side in FIG. 3(a)) of the front roof beam 23 (rear roof beam 26) (hereinafter also referred to as the "downward left inclination state"). FIG. 3(b) shows a state in which the posture of the front roof beam 23 (rear roof beam 26) is horizontal. FIG. 3(c) shows a state in which the posture of the front roof beam 23 (rear roof beam 26) is inclined upward from the right end side (left side in FIG. 3(c)) to the left end side (right side in FIG. 3(c)) of the front roof beam 23 (rear roof beam 26) (hereinafter also referred to as the "upward left inclination state").

[0053] Here, the reference numerals P1 to P3 shown in FIGS. 3(a) to 3(c) are detected values (water pressure) detected by the pressure gauge 82. As shown in FIG. 3(a), when the posture of the front overhead beam 23 (rear overhead beam 26) is in a downward leftward inclined state, the detected value (water pressure) P1 by the pressure gauge 82 becomes a relatively large value compared to the detected value (water pressure) P2. On the contrary, as shown in FIG. 3(c), when in an upward leftward inclined state, the detected value (water pressure) P3 by the pressure gauge 82 becomes a relatively small value compared to the detected value (water pressure) P2. Also, as shown in FIG. 3(b), the magnitude of the detected value (water pressure) P2 by the pressure gauge 82 when the posture of the front overhead beam 23 (rear overhead beam 26) is in a horizontal posture becomes the horizontal basic value.

[0054] In the present embodiment, the detected value P2 of the pressure gauge 82 corresponding to when the postures of the front overhead beam 23 or the rear overhead beam 26 are in a horizontal state respectively is grasped in advance by an actual machine test or the like as the "pressure value corresponding to the horizontal posture". According to this, during the construction of the covering concrete, by controlling the elevating devices 3A to 3D with the detected values (water pressure) detected by the respective pressure gauges 82 in the front overhead beam inclination detection unit 8A and the rear overhead beam inclination detection unit 8B at the horizontal time as P2, a leveling process for adjusting the front overhead beam 23 and the rear overhead beam 26 at the center E to a horizontal posture can be performed.

[0055] Furthermore, as shown in FIG. 1, a first sighting target 27 and a second sighting target 28 are respectively attached to the front portal frame 20A and the rear portal frame 20B at the center E. The first sighting target 27 and the second sighting target 28 are targets sighted by a total station R as a surveying instrument, and for example, a surveying prism can be applied.

[0056] In the present embodiment, the first sighting target 27 is one of a pair of left and right front legs extending downward from the front overhead beam 23 in the front portal frame 20A, that is, the front right leg 2 It is attached to either one of the front right foot 21 and the front left foot 22. Also, the second sighting target 28 is attached to either one of the pair of left and right rear legs extending downward from the rear crossbeam 26 in the rear portal frame 20B, that is, either the rear right foot 24 or the rear left foot 25. Further, in the example shown in FIG. 1, the first sighting target 27 and the second sighting target 28 are attached to one leg on the same side in the tunnel width direction among the pair of left and right front legs (front right foot 21 and front left foot 22) and the pair of left and right rear legs (rear right foot 24 and rear left foot 25). Specifically, the first sighting target 27 is attached to the front right foot 21 in the front portal frame 20A, and the second sighting target 28 is attached to the rear right foot 24 in the rear portal frame 20B.

[0057] Also, as shown in FIG. 1, in front of the center E in the tunnel C, a total station R for sighting the first sighting target 27 and the second sighting target 28 and measuring their three-dimensional position coordinates is installed at a position slightly away from the center E. The total station R is, for example, an automatic tracking type distance measuring and angle measuring instrument (surveying instrument) using laser light.

[0058] As described above, in this embodiment, since the first sighting target 27 and the second sighting target 28 are attached to the respective right legs 21, 24 in the pedestal 2 of the center E, the total station R is arranged in the region on the other side (that is, the left side region) with the center line in the center width direction as the boundary with the first sighting target and the second sighting target. In the example shown in FIG. 1, the total station R is installed at a position farther from the face side than the center E in the tunnel C, but it may be installed at a position farther from the rear side of the center E, that is, the pit mouth side.

[0059] Further, as shown in FIG. 1, the automatic setting system S of the center E in the present embodiment includes a computer 9. The computer 9 acquires the three-dimensional position coordinates of the first sighting target 27 and the second sighting target 28 measured by the total station R and transmits them to the control panel (control device) 6 of the center E. In the present embodiment, the computer 9 is communicably connected to the total station R by wire or wirelessly, but it may be incorporated inside the total station R.

[0060] The computer 9 may be, for example, a tablet or a notebook computer. FIG. 4 is a diagram showing a configuration example of the computer 9. The computer 9 includes a control unit 91, a display unit 94, an operation unit 95, a storage unit 96, a communication unit 97, and the like. The control unit 91 includes a CPU 92 and a memory 93, and the CPU 92 executes various programs stored in the memory 93 to perform various controls. The memory 93 can be constituted by, for example, a ROM, a RAM, or the like. The display unit 94 of the computer 9 can be constituted by, for example, a display or a touch panel. Also, the operation unit 95 can be constituted by, for example, operation buttons or a touch panel. The communication unit 97 can transmit and receive information data and signals to and from the total station R and the control panel 6. Further, tunnel information including the linear information and cross-sectional information of the tunnel C is stored in the storage unit 96.

[0061] FIG. 5 is a diagram showing a configuration example of the control panel 6 in the center E. The control panel 6 includes a control unit 61, a display unit 64, an operation unit 65, a storage unit 66, a communication unit 67, a speaker 68, and the like. The control unit 61 includes a CPU 62 and a memory 63, and the CPU 62 executes various programs stored in the memory 63 to perform various controls. The memory 63 can be constituted by, for example, a ROM, a RAM, or the like. The display unit 64 can be constituted by, for example, a display or a touch panel. Also, the operation unit 65 can be constituted by, for example, operation buttons or a touch panel. The communication unit 67 can transmit and receive information data and signals to and from the computer 9. Also, the communication unit 67 can transmit and receive information data between the total station R It may also be possible to transmit and receive data and signals. The storage unit 66 stores detection signals from sensors and instruments provided in various devices of the center E and data received from the computer 9. The speaker 68 outputs messages, announcements, etc. as audio, or outputs an alarm sound in an emergency.

[0062] Next, the processing content executed in the automatic setting system according to this embodiment will be described. FIG. 6 is a diagram showing an example of a front view of the operation panel 6. Reference numeral 901 is a touch panel included in the display unit 64 and the operation unit 65. Reference numeral 902 is a power lamp, and reference numeral 903 is an emergency stop switch. Reference numeral 904 is a hydraulic unit start switch for starting the hydraulic unit of the center E, reference numeral 905 is a hydraulic unit stop switch for stopping the hydraulic unit of the center E, reference numeral 906 is an electric unit start switch for starting the electric unit of the center E, and reference numeral 907 is an electric unit stop switch for stopping the electric unit of the center E. Reference numeral 908 is a pre-start alarm bell switch, reference numeral 910 is a right-side form crack prevention lamp, reference numeral 911 is a left-side form crack prevention lamp, reference numeral 912 is a right-side invert form crack prevention lamp, reference numeral 913 is a left-side invert form crack prevention lamp, and reference numeral 914 is a top form crack prevention lamp. Reference numeral 915 is a top form demolding switch.

[0063] The power lamp 902 is a lamp for indicating the presence or absence of power input to the operation panel 6. The emergency stop switch 903 is a switch for forcibly stopping the operation panel 6 in an emergency. The hydraulic unit start switch 904 is a switch for starting the hydraulic pump that operates the drive cylinders of the elevating devices 3A to 3D, the cross-feed devices 4A to 4D, the side form drive cylinder 71, the invert form drive cylinder 72, etc. provided in the center E, and the hydraulic unit stop switch 905 is a switch for stopping the hydraulic pump.

[0064] Also, the electric unit start switch 906 is a switch for starting the electric drive units of the first traveling device 5A and the second traveling device 5B provided in the center E, and for starting the supply of operating power to the travel amount detection sensor, each lifting device 3A to 3D, each cross-feed device 4A to 4D, the extension position detection sensors in each drive cylinder 71, 72, the pressure gauge 82 in the front gantry tilt detection unit 8A and the rear gantry tilt detection unit 8B. The electric unit stop switch 907 is a switch for stopping these. The pre-start alarm switch 908 is a switch for outputting a horn sound from the speaker 68 when starting the demolding of the mold body 1 in the center E or starting the movement of the center E.

[0065] Each crack prevention lamp 910 to 914 is a lamp for indicating the operating state of a crack prevention sensor (not shown) attached to a frame member facing the pit side in the mold body 1, and lights up, for example, when the sensor operates. The right side form crack prevention lamp 910 is a lamp for indicating the operating state of the crack prevention sensor installed in the right side form 12 in the center E, and the left side form crack prevention lamp 911 is a lamp for indicating the operating state of the crack prevention sensor installed in the left side form 12. Also, the right side invert form crack prevention lamp 912 is a lamp for indicating the operating state of the crack prevention sensor installed in the right side invert form 13 in the center E, and the left side invert form crack prevention lamp 913 is a lamp for indicating the operating state of the crack prevention sensor attached to the left side invert form 13. Also, the top form crack prevention lamp 914 is a lamp for indicating the operating state of the crack prevention sensor installed in the top form 11. Also, the reference numeral 915 is a top form demolding switch for simultaneously contracting each of the lifting devices 3A to 3D by a predetermined amount.

[0066] FIG. 7 is a diagram showing the construction procedure of the covering concrete by the automatic setting system. Also, FIGS. 8 to 22 are diagrams for explaining the construction procedure of the covering concrete.

[0067] Here, an example of mechanizing and automating the process from the state where the curing of the existing formwork concrete is completed, demolding the center E, moving the center E to the new formwork construction section where new formwork concrete is to be placed, and then installing the formwork body 1 at a predetermined formwork setting position will be described.

[0068] First, as shown in step S01 of FIG. 7, a demolding process is performed to mechanically and automatically demold the existing formwork concrete by reducing the diameter of the formwork body 1. Note that prior to starting the automatic demolding process, first, the operation panel 6 is activated. For example, an operator operates the hydraulic unit start switch 904 and the electric unit start switch 906 on the operation panel 6 to activate the hydraulic unit and the electric unit. Thereafter, the operator operates the pre-start alarm switch 908 to notify the surrounding area of the start of work on the center E.

[0069] Here, FIG. 8 is a diagram for explaining the operation selection screen P1 of the touch panel 901 on the operation panel 6. On the operation selection screen P1, various selection menus such as horizontal extension operation M1, top form up and down operation M2, top form left and right operation M3, side form / invert form operation M4, tilt operation M5, center front and rear position setting operation M6, wife plate operation M7, end M8, etc. are displayed. However, the above display mode of the touch panel 901 is an example.

[0070] Here, when the side form / invert form operation M4 on the operation selection screen P1 is selected from the menu, the touch panel 901 switches to the side form / invert form operation screen P2 shown in FIG. 9. On the side form / invert form operation screen P2, an automatic set switch SW1, an automatic demolding switch SW2, a side form operation switch SW3, an invert form operation switch SW4, and an operation selection screen return switch SW5 are displayed.

[0071] For example, when demolding the invert form 13 from the existing formwork concrete, after pressing the automatic demolding switch SW2 on the side form - invert form operation screen P2, press the invert form operation switch SW4. Triggered by this, the control unit 61 of the operation panel 6 sends an operation signal to the controllers of the pair of left - and - right invert form driving cylinders 72, and performs an invert form demolding process of shrinking the invert form driving cylinders 72 by a predetermined amount. As a result, the pair of left - and - right invert forms 13 are demolded by reducing their diameters. Note that the amount of contraction of each invert form driving cylinder 72 controlled during the demolding of the pair of left - and - right invert forms 13 can be set in advance. Of course, when demolding the invert form 13, the pair of left - and - right invert form driving cylinders 72 can be contracted in sequence to demold the left - and - right invert forms 13 in sequence. Also, regarding the operation amount of the invert form driving cylinders 72 when demolding the invert form 13, an input operation by the operator on the touch panel 901 can be accepted, and the invert form driving cylinders 72 can be operated according to the input value.

[0072] After the demolding of the invert form 13 is completed as described above, press the side form operation switch SW3 while the automatic demolding switch SW2 is selected. Triggered by this, the control unit 61 of the operation panel 6 outputs an operation signal to the controllers of the pair of left - and - right side form driving cylinders 71, and performs a side form demolding process of shrinking the side form driving cylinders 71 by a predetermined amount. As a result, the pair of left - and - right side forms 12 are demolded by reducing their diameters. Note that the amount of contraction of each side form driving cylinder 71 controlled during the demolding of the pair of left - and - right side forms 12 can be set in advance. Of course, when demolding the side form 12, the pair of left - and - right side form driving cylinders 71 can be operated in sequence. Also, regarding the operation amount of the side form driving cylinders 71 when demolding the side form 12, an input operation can also be accepted via the touch panel 901.

[0073] Next, after demolding the left and right invert forms 13 and the side forms 12 as described above, the operator operates the top form demolding switch 915 on the operation panel 6. Triggered by this, the control unit 61 on the operation panel 6 performs a top form demolding process of simultaneously contracting each of the lifting devices 3A to 3D by a predetermined amount. As a result, the top form 11 descends by a predetermined amount, and the top form 11 is demolded.

[0074] Note that the operating amount of each of the lifting devices 3A to 3D when demolding the top form 11 is set in advance as a specified value, and the top form 11 can be automatically demolded by pressing the top form demolding switch 915. However, regarding the operating amount of each of the lifting devices 3A to 3D when demolding the top form 11, the input operation of the operator may also be received via the touch panel 901. Also, in the above aspect, an example of separately receiving the operation of the operator on the touch panel 901 when performing the demolding operation of the invert form 13, the side form 12, and the top form 11 in the formwork body 1 has been described. However, triggered by a single operation on the touch panel 901, a series of demolding operations for the invert form 13, the side form 12, and the top form 11 may be performed fully automatically. In the above manner, the formwork body 1 can be mechanically and automatically demolded from the existing formwork concrete.

[0075] Next, the construction procedure of the formwork concrete proceeds to step S02 in FIG. 7, and a cleaning process for automatically cleaning the formwork surface in the formwork body 1 is performed. In the cleaning process, the operator returns to the operation selection screen P1 shown in FIG. 8 by selecting the operation selection screen return switch SW5 displayed on the side form / invert form operation screen P2, and then selects the cleaning operation M5 from the menu. When the cleaning operation M5 is selected from the menu, the screen moves to the cleaning operation screen P3 shown in FIG. 10. The cleaning operation screen P3 displays a forward movement switch SW6, a cleaning start switch SW7, and an operation selection screen return switch SW5.

[0076] FIG. 11 is a diagram for explaining the jacking work position for performing the automatic jacking work of the centering device E. The reference sign SC shown in FIG. 11 is the existing section ZB of the formwork concrete removed in the form removal step of step S01 (hereinafter referred to as the "immediate formwork section"), and the reference sign SC is the formwork concrete in the immediate formwork section ZB. The reference sign ZN is the newly constructed formwork section described above, and the newly constructed formwork section ZN is adjacent to the immediate formwork section ZB on the heading side. In FIG. 11, a state is shown in which the centering device E has moved forward to the heading side from the immediate formwork section ZB to the jacking work position. As shown in FIG. 11, the jacking work position is located on the heading side of the newly constructed formwork section ZN. That is, in the jacking process, the centering device E moves forward from the immediate formwork section ZB to the jacking work position that passes over the newly constructed formwork section ZN. Note that the moving distance (hereinafter referred to as the "jacking preparation forward distance") DC when moving forward from the immediate formwork section ZB to the jacking work position is preset as a specified value.

[0077] When moving the centering device E forward to the jacking work position, the operator presses the forward movement switch SW6 on the jacking operation screen P3 of the touch panel 901. Triggered by this, the control unit 61 of the operation panel 6 sends an operation signal to the first traveling device 5A and the second traveling device 5B, and performs a forward movement process for moving the centering device E forward to the jacking work position.

[0078] In the forward movement process, the control unit 61 of the operation panel 6 sequentially receives the detection signals detected by the traveling amount detection sensor from the first traveling device 5A and the second traveling device 5B, and moves the centering device E forward until the forward movement amount of the centering device E after operating the first traveling device 5A and the second traveling device 5B reaches the jacking preparation forward distance DC, and stops the first traveling device 5A and the second traveling device 5B when the forward movement amount reaches the jacking preparation forward distance DC. As a result, as shown in FIG. 11, the centering device E can be moved forward from the immediate formwork section ZB to the jacking work position.

[0079] When the center E moves forward, the control unit 61 of the operation panel 6 acquires detection signals from the travel amount detection sensors of the first traveling device 5A and the second traveling device 5B at regular intervals, calculates the forward movement amount of the center E based on the acquired detection signals, and sequentially stores the calculated forward movement amount in the storage unit 66. Further, when the first traveling device 5A and the second traveling device 5B are stopped, the control unit 61 resets the forward movement amount of the center E stored in the storage unit 66.

[0080] After mechanically and automatically moving the center E to the caulking work position as described above, the operator presses the caulking start switch SW7 on the caulking operation screen P3 of the touch panel 901. As a result, the control unit 61 on the operation panel 6 transmits an activation signal to an automatic caulking device (not shown). As a result, the automatic caulking device operates, and the formwork surface of the formwork body 1 is cleaned. Since this type of automatic caulking device itself is well-known, a detailed description thereof will be omitted. The automatic caulking device includes a belt member disposed along the circumferential direction on the formwork surface of the formwork body 1, a caulking portion supported by the belt member and capable of contacting the formwork surface, a belt member reciprocating device for reciprocating the belt member in its longitudinal direction, and a belt member moving device for driving the belt member along the front-rear direction (center longitudinal direction) of the gantry 2.

[0081] By moving the belt member in the longitudinal direction of the center while reciprocating the belt member along the circumferential direction on the formwork surface of the formwork body 1, deposits such as mortar adhering to the formwork surface of the formwork body 1 can be removed by the caulking portion, and the formwork surface can be cleaned. When the automatic caulking operation of the formwork body 1 in the center E is completed, the operator presses the operation selection screen return switch SW5 on the caulking operation screen P3 of the touch panel 901 to switch the display screen to the operation selection screen P1.

[0082] Next, the construction procedure of the lining concrete proceeds to step S03 in FIG. 7, and automatically adjusts the position of the center E (formwork 2) in the tunnel longitudinal direction to a predetermined new lining position (center front and rear position setting process). In the center front and rear position setting process, the operator selects the center front and rear position setting operation M6 from the operation selection screen P1 of the touch panel 901. Triggered by this, the control unit 61 on the operation panel 6 performs a center front and rear position setting process to automatically align the position of the center E in the tunnel longitudinal direction with the new lining position. In the center front and rear position setting process, the control unit 61 communicates with the total station R and transmits an operation signal to the total station R, causing the total station R to survey the three-dimensional position coordinates of the first sighting target 27 and the second sighting target 28 on the center E. Note that the control unit 61 may communicate with the computer 9 and operate the total station R via the computer 9.

[0083] The total station R that has received a command from the control unit 61 on the operation panel 6 sights at least one of the first sighting target 27 and the second sighting target 28 and acquires its three-dimensional position coordinates. Here, the case where the total station R surveys the three-dimensional position coordinates of the first sighting target 27 will be described as an example. The total station R transmits data regarding the three-dimensional position coordinates of the acquired first sighting target 27 (hereinafter referred to as "first position coordinate data") to the computer 9. The control unit 91 of the computer 9 stores the first position coordinate data acquired from the total station R in the storage unit 96.

[0084] Further, the control unit 91 of the computer 9 calculates the required forward and backward movement amount DB of the gantry 2 at the center E based on the first position coordinate data acquired from the total station R and the tunnel information data including the linear information and cross-sectional information of the tunnel C. This required forward and backward movement amount DB is the amount of movement necessary to align the position of the tunnel in the longitudinal direction at the center E with the position of the newly constructed lining. Also, the position of the newly constructed lining is the position in the longitudinal direction of the tunnel where the gantry 2 of the center E should be set when placing the lining concrete in the newly constructed lining section ZN, and is defined in association with the newly constructed lining section ZN. In the present embodiment, since the face advance work position is set closer to the face side than the newly constructed lining section ZN, the required forward and backward movement amount DB is calculated as the distance by which the gantry 2 of the center E should be moved backward toward the shaft side. Note that the required forward and backward movement amount DB may indicate the amount of movement by which the gantry 2 should be moved toward the shaft side along the longitudinal direction of the tunnel when the value is positive, and the amount of movement by which the gantry 2 should be moved toward the face side along the longitudinal direction of the tunnel when the value is negative.

[0085] Then, the control unit 91 of the computer 9 stores the calculated required forward and backward movement amount DB in the storage unit 96 and transmits the required forward and backward movement amount DB to the operation panel 6. Then, the control unit 61 of the operation panel 6 stores the required forward and backward movement amount DB received from the computer 9 in the storage unit 66 and transmits an operation signal corresponding to the required forward and backward movement amount DB to the first traveling device 5A and the second traveling device 5B to move the gantry 2 of the center E to the newly constructed lining position. Here, the first traveling device 5A and the second traveling device 5B are operated to move the gantry 2 of the center E backward on the rail TR to the newly constructed lining position.

[0086] At this time, the control unit 61 of the operation panel 6 sequentially receives the detection signals detected by the travel amount detection sensor from the first traveling device 5A and the second traveling device 5B, and moves the center E backward until the backward movement amount of the center E after operating the first traveling device 5A and the second traveling device 5B reaches the required forward and backward movement amount DB, and stops the first traveling device 5A and the second traveling device 5B when the backward movement amount reaches the required forward and backward movement amount DB. As described above, by the control unit 61 in the operation panel 6 executing the center front and rear position setting process, the position of the center E in the longitudinal direction of the tunnel can be mechanically and automatically matched with the newly installed lining position.

[0087] FIG. 12 is a diagram showing a state where the center front and rear position setting process (center front and rear position setting step) is completed. In the state shown in FIG. 12, the position of the center E in the longitudinal direction of the tunnel is arranged at the newly installed lining position corresponding to the newly installed lining section ZN. As shown in FIG. 12, the rear end region (shaft side) of the formwork 1 in the longitudinal direction of the tunnel at the center E is arranged so as to overlap (overlap) vertically with the front end region of the immediately preceding lining section ZB. Hereinafter, the rear end region at the center E may be referred to as the "overlap side region". Also, the end region on the opposite side of the overlap side region at the center E, that is, the front end region, may be referred to as the "ridge side region".

[0088] After the center front and rear position setting step, the construction procedure of the lining concrete proceeds to step S04 in FIG. 7, and a horizontal extension process for automatically setting the front top beam 23 of the front gantry frame 20A and the rear top beam 26 of the rear gantry frame 20B at the center E to a horizontal posture is executed by the control unit 61 in the operation panel 6 (horizontal extension step). In the horizontal extension process, the control unit 61 acquires the inclination postures of the front top beam 23 in the front gantry frame 20A and the rear top beam 26 in the rear gantry frame 20B based on the detection information of the inclination detection devices (front top beam inclination detection unit 8A, rear top beam inclination detection unit 8B), and independently controls the lifting devices 3A to 3D so that the front top beam 23 and the rear top beam 26 become horizontal postures based on the acquisition results.

[0089] FIG. 13 is a diagram schematically showing the situation of the horizontal extension process for the front overhead beam 23 and the rear overhead beam 26. Also, as described with reference to FIG. 3, the control unit 61 can determine the inclined postures of the front overhead beam 23 and the rear overhead beam 26 based on the detection values (water pressure) of the pressure gauges 82 in the front overhead beam inclination detection unit 8A and the rear overhead beam inclination detection unit 8B.

[0090] When an operator selects the horizontal extension operation M1 on the operation selection screen P1 of the touch panel 901, the display screen moves to the horizontal extension operation screen P4 shown in FIG. 14. On the horizontal extension operation screen P4 shown in FIG. 14, a wife-side horizontal extension switch SW8, a wrap-side horizontal extension switch SW9, and an operation selection screen return switch SW5 are displayed. Then, by touch operation by the operator by the operator, for example, when the wife-side horizontal extension switch SW8 is selected, the control unit 61 executes a horizontal extension process for the front overhead beam 23 of the front gantry frame 20A in response to this. Specifically, the control unit 61 acquires the pressure (hereinafter referred to as "first pressure detection value Pr1") detected by the pressure gauge 82 in the front overhead beam inclination detection unit 8A at regular intervals.

[0091] The control unit 61 sequentially stores the first pressure detection value Pr1 acquired from the pressure gauge 82 of the front overhead beam inclination detection unit 8A in the storage unit 66. Also, in the storage unit 66 of the control unit 61, a "horizontal posture corresponding pressure value Prb", which is the detection value of the pressure gauge 82 corresponding to when the posture of the front overhead beam 23 is in a horizontal state, is recorded. The control unit 61 compares the first pressure detection value Pr1 acquired from the front overhead beam inclination detection unit 8A with the horizontal posture corresponding pressure value Prb, and determines that the front overhead beam 23 is in a horizontal posture when both values match. If the front overhead beam 23 is in a horizontal posture from the beginning of the horizontal extension process, the control unit 61 may output a display on the touch panel 901 indicating that the horizontal extension operation for the front overhead beam 23 has been completed without operating the front right lifting device 3A and the front left lifting device 3B, or may output an announcement to that effect from the speaker 68.

[0092] On the other hand, when the first pressure detection value Pr1 does not match the horizontal posture corresponding pressure value Prb, the control unit 61 determines that the front overhead beam 23 is inclined in the tunnel height direction. As described with reference to FIG. 3, when the first pressure detection value Pr1 is greater than the horizontal posture corresponding pressure value Prb, the control unit 61 determines that the front overhead beam 23 is in a downward left inclined posture (see (a) of FIG. 3). In this case, the control unit 61 contracts the drive cylinder of the front right lifting device 3A to lower the front right leg portion 21, extends the drive cylinder of the front left lifting device 3B to raise the front left leg portion 22, or uses a combination of these. As a result, the downward left inclination degree of the front overhead beam 23 decreases, and the front overhead beam 23 can be brought closer to a horizontal posture.

[0093] Conversely, when the first pressure detection value Pr1 is smaller than the horizontal posture corresponding pressure value Prb, the control unit 61 determines that the front overhead beam 23 is in an upward left inclined posture (see (c) of FIG. 3). In this case, the control unit 61 extends the drive cylinder of the front right lifting device 3A to raise the front right leg portion 21, contracts the drive cylinder of the front left lifting device 3B to lower the front left leg portion 22, or uses a combination of these. As a result, the upward left inclination degree of the front overhead beam 23 decreases, and the front overhead beam 23 can be brought closer to a horizontal posture.

[0094] In the present embodiment, the control unit 61 performs feedback control on the front right lifting device 3A and the front left lifting device 3B so that the first pressure detection value Pr1 obtained from the front overhead beam inclination detection unit 8A at regular intervals matches the horizontal posture corresponding pressure value Prb. That is, until the first pressure detection value Pr1 matches the horizontal posture corresponding pressure value Prb, the drive cylinders of the front right lifting device 3A and the front left lifting device 3B are independently controlled, whereby the front overhead beam 23 can be made horizontal. Thereby, the horizontal alignment process for the front overhead beam 23 is completed.

[0095] Note that when the first pressure detection value Pr1 matches the horizontal posture corresponding pressure value Prb, the control unit 61 stops the operation of the front right lifting device 3A and the front left lifting device 3B, and ends the horizontal extension process for the front overhead beam 23. Further, the control unit 61 outputs a display on the touch panel 901 indicating that the horizontal extension operation for the front overhead beam 23 has been completed, or outputs an announcement to that effect as voice from the speaker 68.

[0096] Next, the horizontal extension process for the rear overhead beam 26 of the rear gantry frame 20B will be described. When the wrap side horizontal extension switch SW9 is selected on the horizontal extension operation screen P4, the control unit 61 starts the horizontal extension process for the rear overhead beam 26 in response to this. Specifically, the control unit 61 acquires at regular intervals the pressure detected by the pressure gauge 82 in the rear overhead beam tilt detection unit 8B (hereinafter referred to as the "second pressure detection value Pr2").

[0097] The control unit 61 sequentially stores the second pressure detection value Pr2 acquired from the pressure gauge 82 of the rear overhead beam tilt detection unit 8B in the storage unit 66. Further, in the storage unit 66 of the control unit 61, the "horizontal posture corresponding pressure value Prb", which is the detection value of the pressure gauge 82 corresponding to the state where the posture of the rear overhead beam 26 is horizontal, is recorded. The control unit 61 compares the second pressure detection value Pr2 acquired from the rear overhead beam tilt detection unit 8B with the horizontal posture corresponding pressure value Prb, and determines that the front overhead beam 23 is in a horizontal posture when the two values match. Note that if the rear overhead beam 26 is in a horizontal posture from the start of the horizontal extension process, the control unit 61 may output a display on the touch panel 901 indicating that the horizontal extension operation for the rear overhead beam 26 has been completed without operating the rear right lifting device 3C and the rear left lifting device 3D, or may output an announcement to that effect as voice from the speaker 68.

[0098] On the other hand, when the second pressure detection value Pr2 does not match the horizontal posture corresponding pressure value Prb, the control unit 61 determines that the rear overhead beam 26 is inclined in the tunnel height direction. As described with reference to FIG. 3, when the second pressure detection value Pr2 is greater than the horizontal posture corresponding pressure value Prb, the control unit 61 determines that the rear overhead beam 26 is in a downward left inclined posture (see (a) of FIG. 3). In this case, the control unit 61 contracts the drive cylinder of the rear right lifting device 3C to lower the rear right leg portion 24, extends the drive cylinder of the rear left lifting device 3D to raise the rear left leg portion 25, or uses a combination of these. As a result, the downward left inclination degree of the rear overhead beam 26 decreases, and the front overhead beam 23 can be brought closer to a horizontal posture.

[0099] Conversely, when the second pressure detection value Pr2 is smaller than the horizontal posture corresponding pressure value Prb, the control unit 61 determines that the rear overhead beam 26 is in an upward left inclined posture (see (c) of FIG. 3). In this case, the control unit 61 extends the drive cylinder of the rear right lifting device 3C to raise the rear right leg portion 24, contracts the drive cylinder of the rear left lifting device 3D to lower the rear left leg portion 25, or uses a combination of these. As a result, the upward left inclination degree of the rear overhead beam 26 decreases, and the rear overhead beam 26 can be brought closer to a horizontal posture.

[0100] In the present embodiment, the control unit 61 performs feedback control on the rear right lifting device 3C and the rear left lifting device 3D so that the second pressure detection value Pr2 obtained from the rear overhead beam inclination detection unit 8B at regular intervals matches the horizontal posture corresponding pressure value Prb. That is, by independently controlling the drive cylinders of the rear right lifting device 3C and the rear left lifting device 3D until the second pressure detection value Pr2 matches the horizontal posture corresponding pressure value Prb, the rear overhead beam 26 can be made horizontal. Thereby, the horizontal extension process for the rear overhead beam 26 is completed.

[0101] Note that when the second pressure detection value Pr2 matches the horizontal posture corresponding pressure value Prb, the control unit 61 stops the operation of the rear right lifting device 3C and the rear left lifting device 3D, and ends the horizontal extension process for the rear overhead beam 26. Further, the control unit 61 outputs a display on the touch panel 901 indicating that the horizontal extension operation for the rear overhead beam 26 has been completed, or outputs an announcement to that effect from the speaker 68 as voice.

[0102] Also, in the above aspect, an example in which the horizontal extension processes for the front overhead beam 23 and the rear overhead beam 26 at the center E are performed separately has been described, but these processes may be performed substantially simultaneously. For example, a "simultaneous horizontal extension switch for the wife side and the wrap side" is arranged on the horizontal extension operation screen P4 of the touch panel 901 shown in FIG. 14, and when the switch is selected and operated by an operator, the control unit 61 may perform the horizontal extension processes for the front overhead beam 23 and the rear overhead beam 26 in parallel. According to the automatic setting system of the center E in the present embodiment, since the tilt detection devices (front overhead beam tilt detection unit 8A, rear overhead beam tilt detection unit 8B) are provided, the horizontal extension of the front overhead beam 23 and the rear overhead beam 26 can be performed without surveying the first sighting target 27 and the second sighting target 28 by the total station R. Also, After the horizontal extension process of the center E is completed, when the operation selection screen return switch SW5 on the horizontal extension operation screen P4 of the touch panel 901 is selected and operated by an operator, the touch panel 901 is switched to the operation selection screen P1.

[0103] When the horizontal extension process ends, the process proceeds to step S05 in FIG. 7, and a center left and right position setting process is performed to automatically adjust the position of the center E in the tunnel width direction to the newly constructed lining position (center left and right position setting step). Usually, by aligning the center in the width direction of the center E with the center line L1 in the tunnel width direction, the position of the center E in the tunnel width direction matches the newly constructed lining position.

[0104] Here, when the left - right operation M3 of the top form in the operation selection screen P1 of the touch panel 901 is selected from the menu, the touch panel 901 switches to the left - right position setting operation screen P5 shown in FIG. 15. On the left - right position setting operation screen P5, a wife - side left - right alignment switch SW10, a wrap - side left - right alignment switch SW11, and an operation selection screen return switch SW5 are displayed. FIG. 16 is a diagram schematically showing the situation of the center left - right position setting process.

[0105] In the present embodiment, when either the wife - side left - right alignment switch SW10 or the wrap - beam - side left - right alignment switch SW11 on the left - right position setting operation screen P5 is selected and operated, the center left - right position setting process is started. When the center left - right position setting process is started, the control unit 61 on the operation panel 6 communicates with the total station R and transmits an operation signal to the total station R, so that the total station R measures the three - dimensional position coordinates of the first sighting target 27 and the second sighting target 28 at the center E. Note that the control unit 61 may communicate with the computer 9 and operate the total station R via the computer 9.

[0106] The total station R that has received a command from the control unit 61 on the operation panel 6 automatically tracks the first sighting target 27 and the second sighting target 28 and sequentially sights them, and acquires the three - dimensional position coordinates of the first sighting target 27 and the second sighting target 28 respectively. The total station R transmits the first position coordinate data regarding the acquired first sighting target 27 and the data regarding the three - dimensional position coordinates of the second sighting target 28 (hereinafter referred to as "second position coordinate data") to the computer 9. The control unit 91 of the computer 9 stores the first position coordinate data and the second position coordinate data acquired from the total station R in the storage unit 96.

[0107] The control unit 91 of the computer 9 calculates the first left - right required movement amount DW1 in the tunnel width direction of the front portal frame 20A at the center E and the second left - right required movement amount DW2 in the tunnel width direction of the rear portal frame 20B based on the first position coordinate data and the tunnel information data obtained from the total station R. The first left - right required movement amount DW1 is the movement amount along the tunnel width direction of the front portal frame 20A required to align the position in the tunnel width direction at the center E with the above - mentioned newly constructed lining position. Also, the second left - right required movement amount DW2 is the movement amount along the tunnel width direction of the rear portal frame 20B required to align the position in the tunnel width direction at the center E with the newly constructed lining position. In the present embodiment, the above - mentioned first left - right required movement amount DW1 and second left - right required movement amount DW2 respectively correspond to the first left - right required movement amount of the first lateral feeding device and the second left - right required movement amount of the second lateral feeding device of the present invention.

[0108] The control unit 91 of the computer 9 stores the calculated first left - right required movement amount DW1 and second left - right required movement amount DW2 in the storage unit 96 and transmits them to the operation panel 6. Then, the control unit 61 of the operation panel 6 stores the first left - right required movement amount DW1 and second left - right required movement amount DW2 received from the computer 9 in the storage unit 66. Note that the first left - right required movement amount DW1 (the second left - right required movement amount DW2) may indicate the movement amount by which the front portal frame 20A (rear portal frame 20B) should be slid to the right along the tunnel width direction when it is a positive value, and the movement amount by which the front portal frame 20A (rear portal frame 20B) should be slid to the left along the tunnel width direction when it is a negative value. 2 left - right required movement amount DW2) indicates the movement amount by which the front portal frame 20A (rear portal frame 20B) should be slid to the right along the tunnel width direction when it is a positive value, and the movement amount by which the front portal frame 20A (rear portal frame 20B) should be slid to the left along the tunnel width direction when it is a negative value.

[0109] Here, when the wife-side left-right alignment switch SW10 on the left-right position setting operation screen P5 is selected and operated, the control unit 61 of the operation panel 6 first performs center alignment of the front portal frame 20A (front top beam 23). That is, the control unit 61 transmits an operation signal corresponding to the first left-right required movement amount DW1 acquired from the computer 9 to the first lateral feed devices (front right lateral feed device 4A and front left lateral feed device 4B), and the center position in the width direction of the front portal frame 20A (the span center of the front top beam 23) is located on the center line L1 in the tunnel width direction. The drive cylinders of the front right lateral feed device 4A and the front left lateral feed device 4B are coordinately controlled simultaneously, in the same direction (extension or contraction direction), and at the same speed. Thereby, it can be slid along the tunnel width direction without applying a large load (external force) to the front portal frame 20A.

[0110] When operating the front right lateral feed device 4A and the front left lateral feed device 4B, the control unit 61 acquires the extension position of each drive cylinder from each extension position detection sensor provided in each lateral feed device 4A, 4B at regular intervals. Thereby, the control unit 61 can acquire the operation amount in real time since the operation of each lateral feed device 4A, 4B is started. Then, when the operation amount of each lateral feed device 4A, 4B reaches the first left-right required movement amount DW1, the control unit 61 stops the operation of each lateral feed device 4A, 4B, and thus the center alignment of the front portal frame 20A (front top beam 23) is completed. At that time, the control unit 61 may output a display indicating that the center alignment of the front portal frame 20A (front top beam 23) is completed to the touch panel 901, or may output an announcement to that effect from the speaker 68 as voice.

[0111] Next, when the operator selects and operates the wrap side left - right alignment switch SW11 on the left - right position setting operation screen P5, the control unit 61 of the operation panel 6 performs centering of the rear portal frame 20B (rear top beam 26). That is, the control unit 61 transmits an operation signal corresponding to the second left - right required movement amount DW2 acquired from the computer 9 to the second lateral feed devices (rear right - hand lateral feed device 4C and rear left - hand lateral feed device 4D), and simultaneously, in the same direction (extension or contraction direction), and at the same speed, the drive cylinders of the rear right - hand lateral feed device 4C and the rear left - hand lateral feed device 4D are coordinatedly controlled so that the center position in the width direction of the rear portal frame 20B (the span center of the rear top beam 26) is located on the center line L1 in the tunnel width direction. Thereby, it is possible to slide along the tunnel width direction without applying a large load (external force) to the rear portal frame 20B.

[0112] The control unit 61 acquires the extension position of each drive cylinder from each extension position detection sensor provided in each lateral feed device 4C, 4D at regular intervals, thereby acquiring in real - time the operation amount after starting the operation of each lateral feed device 4C, 4D. Then, when the operation amount of each lateral feed device 4C, 4D reaches the second left - right required movement amount DW2, the control unit 61 stops the operation of each lateral feed device 4C, 4D, and thus the centering of the rear portal frame 20B (rear top beam 26) is completed. At that time, the control unit 61 may output a display indicating that the centering of the front portal frame 20A (front top beam 23) has been completed to the touch panel 901, or may output an announcement to that effect from the speaker 68.

[0113] As described above, the centering left - right position setting process (centering left - right position setting step) for automatically aligning the position in the tunnel width direction at the center E with the newly - installed lining position is completed. In the above - mentioned centering left - right position setting process, an example in which the centering of the rear portal frame 20B (rear top beam 26) is performed after the front portal frame 20A (front top beam 23) has been described, but the order may be reversed. Or, on the left - right position setting operation screen P5 shown in FIG. 15 Place the "Wife Side / Wrap Side Simultaneous Left - Right Alignment Switch", and when the switch is selected and operated by the operator, the centering of the front portal frame 20A and the rear portal frame 20B may be performed in parallel. When the centering of the center E is completed as described above, the operator selects and operates the operation selection screen return switch SW5 on the left - right position setting operation screen P5, and the touch panel 901 is switched to the operation selection screen P1.

[0114] Next, when the operator selects the top form up - down operation M2 on the operation selection screen P1 of the touch panel 901 from the menu, the display screen moves to the top form height setting screen P6 shown in FIG. 17. The control unit 61 on the operation panel 6 executes a top form height setting process for aligning the top form 11 of the center E to a predetermined top form installation height according to the operation using the top form height setting screen P6 (the top form height setting step shown in step S06 of FIG. 7). The top form installation height is the design height at which the top form 11 of the center E should be installed when placing the formwork concrete in the newly - established formwork section ZN.

[0115] On the top form height setting screen P6 shown in FIG. 17, the wife - side height alignment switch SW12, the wrap - side height alignment switch SW13, and the operation selection screen return switch SW5 are displayed. FIG. 18 is a diagram schematically showing the situation of the top form height setting process.

[0116] In this embodiment, when either the wife - side height alignment switch SW12 or the wrap - side height alignment switch SW13 on the top form height setting screen P6 is selected and operated, the top form height setting process is started. When the top form height setting process is started, the control unit 61 on the operation panel 6 communicates with the total station R and transmits an operation signal to the total station R, causing the total station R to survey the three - dimensional position coordinates of the first sighting target 27 and the second sighting target 28 at the center E. Note that the control unit 61 may communicate with the computer 9 and operate the total station R via the computer 9.

[0117] The total station R that has received a command from the control unit 61 in the operation panel 6 automatically tracks the first sighting target 27 and the second sighting target 28 and sequentially sights them, and measures the three-dimensional position coordinates of the first sighting target 27 and the second sighting target 28. Then, the total station R transmits the first position coordinate data and the second position coordinate data to the computer 9, and the control unit 91 of the computer 9 stores the first position coordinate data and the second position coordinate data acquired from the total station R in the storage unit 96.

[0118] Based on the first position coordinate data acquired from the total station R and the tunnel information data, the control unit 91 of the computer 9 calculates the first vertical required movement amount DH1 in the tunnel height direction (vertical direction) of the front portal frame 20A at the center E and the second vertical required movement amount DH2 in the tunnel height direction (vertical direction) of the rear portal frame 20B, respectively. The first vertical required movement amount DH1 is the movement amount along the tunnel height of the front portal frame 20A required to match the ridge side region (front end region) of the roof form 11 to the roof form installation height. Also, the second vertical required movement amount DH2 is the movement amount along the tunnel height of the front portal frame 20A required to match the wrap side region (rear end region) of the roof form 11 to the roof form installation height. In the present embodiment, the above-described first vertical required movement amount DH1 and second vertical required movement amount DH2 respectively correspond to the first sighting target vertical required movement amount and the second sighting target vertical required movement amount of the present invention.

[0119] The control unit 91 of the computer 9 stores the calculated first vertical required movement amount DH1 and second vertical required movement amount DH2 in the storage unit 96 and transmits them to the operation panel 6. Then, the control unit 61 of the operation panel 6 receives the first vertical required movement amount DH1 and the The necessary vertical movement amount DH2 is stored in the storage unit 66. Note that the first necessary vertical movement amount DH1 (the second necessary vertical movement amount DH2) indicates the movement amount by which the front gantry frame 20A (the rear gantry frame 20B) should be slid upward along the tunnel height direction when it is a positive value, and may indicate the movement amount by which the front gantry frame 20A (the rear gantry frame 20B) should be slid downward along the tunnel height direction when it is a negative value. In this embodiment, since the top form 11 is lowered downward in the demolding process, the first necessary vertical movement amount DH1 and the second necessary vertical movement amount DH2 are calculated as positive values.

[0120] Here, when the wife-side height adjustment switch SW12 on the top form height setting screen P6 is selected and operated, the control unit 61 of the operation panel 6 first raises the front gantry frame 20A (the front top beam 23) to set the wife-side area of the top form 11 to the top form installation height. At this time, the control unit 61 transmits an operation signal corresponding to the first necessary vertical movement amount DH1 acquired from the computer 9 to the front right lifting device 3A and the front left lifting device 3B, and extends the drive cylinders of these lifting devices 3A and 3B to raise the front gantry frame 20A (the front top beam 23) that supports the wife-side area of the top form 11. At this time, the control unit 61 performs cooperative control on the drive cylinders of the lifting devices 3A and 3B simultaneously and at the same speed. Thereby, the wife-side area of the front gantry frame 20A and the top form 11 supported thereby can be raised without applying a large load (external force) to the front gantry frame 20A.

[0121] Further, when the control unit 61 performs extension control in cooperation with the drive cylinders of the lifting devices 3A and 3B, the control unit 61 acquires the extension position of the drive cylinder from the extension position detection sensor in each of the lifting devices 3A and 3B at regular intervals. Thereby, the control unit 61 can acquire the amount of operation in real time since the operation of each of the lifting devices 3A and 3B is started. When the amount of operation of each of the lifting devices 3A and 3B reaches the first vertical required movement amount DH1, the control unit 61 stops the operation of each of the lifting devices 3A and 3B, thereby completing the height adjustment on the wife side in the top form 11. At that time, the control unit 61 may output a display indicating that the height adjustment on the wife side in the top form 11 is completed to the touch panel 901, or may output an announcement to that effect from the speaker 68 as voice output.

[0122] Next, when the operator selects and operates the wrap side height adjustment switch SW13 on the top form height setting screen P6, the control unit 61 of the operation panel 6 raises the rear portal frame 20B (rear top beam 26) to set the wrap side area of the top form 11 to the top form installation height. At that time, the control unit 61 transmits an operation signal corresponding to the second vertical required movement amount DH2 acquired from the computer 9 to the rear right lifting device 3C and the rear left lifting device 3D, and extends the drive cylinders of these lifting devices 3C and 3D, thereby raising the rear portal frame 20B (rear top beam 26) that supports the wrap side area of the top form 11. At that time, the control unit 61 performs coordinated control on the drive cylinders of the lifting devices 3C and 3D simultaneously and at the same speed. Thereby, the rear portal frame 20B and the wrap side area of the top form 11 supported thereby can be raised without applying a large load (external force) to the rear portal frame 20B.

[0123] Further, when the control unit 61 performs extension control in cooperation with the drive cylinders of each of the lifting devices 3C and 3D, the control unit 61 acquires the extension position of the drive cylinder from the extension position detection sensor in each of the lifting devices 3C and 3D at regular intervals. Thereby, the control unit 61 can acquire the operation amount in real time since the operation of each of the lifting devices 3C and 3D is started. When the operation amount of each of the lifting devices 3C and 3D reaches the second vertical required movement amount DH2, the control unit 61 stops the operation of each of the lifting devices 3C and 3D, whereby the height adjustment on the wrap side in the top form 11 is completed. At that time, the control unit 61 may output a display indicating that the height adjustment on the wrap side in the top form 11 is completed to the touch panel 901, or may output an announcement to that effect from the speaker 68. In the top form height setting process described above, the case where the height adjustment of the wrap side area is performed after the height adjustment of the wife side area of the top form 11 has been described, but the order may be changed. Alternatively, a "wife side / wrap side simultaneous height adjustment switch" may be arranged on the top form height setting screen P6 shown in FIG. 17, and when the switch is selected and operated by an operator, the height adjustment of the wife side area and the wrap side area of the top form 11 may be performed in parallel.

[0124] Also, as described with reference to FIG. 12, the wrap side region of the top form 11 is installed so as to wrap around the front end side region of the existing lining concrete in the most recent lining work section ZB. Therefore, a crack prevention sensor for the top form (not shown) is installed in the wrap side region of the top form 11 in the present embodiment. The crack prevention sensor for the top form detects that the rear portal frame 20B has come into contact with the front end side region of the existing lining concrete in the most recent lining work section ZB when the rear portal frame 20B rises during the top form height setting process, and transmits the detection signal to the control unit 61. When the control unit 61 is coordinately controlling the rear right lifting device 3C and the rear left lifting device 3D, when it detects contact between the existing lining concrete and the crack prevention sensor for the top form based on the detection signal of the crack prevention sensor for the top form, it stops the operation of the rear right lifting device 3C and the rear left lifting device 3D. Thereby, when installing the top form 11, it is possible to avoid the wrap side region of the top form 11 from excessively pushing up the existing lining concrete and suppress cracking of the existing lining concrete. When the contact between the crack prevention sensor for the top form and the existing lining concrete is detected during the top form height setting process, the top form crack prevention lamp 914 on the operation panel 6 lights up.

[0125] As described above, the top form height setting process (top form height setting step) for adjusting the top form 11 of the center E to the top form installation height is completed. When the top form height setting process (top form height setting step) is finished, the operator selects and operates the operation selection screen return switch SW5 on the top form height setting screen P6, and the touch panel 901 is switched to the operation selection screen P1.

[0126] In addition, in the above-mentioned top form height setting process (top form height setting step), although a control example was described in which the total station R was made to survey the three-dimensional position coordinates of the first sighting target 27 and the second sighting target 28 again, it is not limited to this. That is, in the storage unit 96 of the computer 9, since the first position coordinate data and the second position coordinate data acquired from the total station R during the centering left-right position setting process (centering left-right position setting step) are stored, based on this first position coordinate data and the second position coordinate data, the control unit 91 of the computer 9 calculates the first required vertical movement amount DH1 and the second required vertical movement amount DH2, and may transmit them to the operation panel 6. Thereby, the time required for the top form height setting process can be shortened.

[0127] Next, the operator selects the side form - invert form operation M4 in the operation selection screen P1. As a result, the display screen of the touch panel 901 switches to the side form - invert form operation screen P2 shown in FIG. 9. On the side form - invert form operation screen P2, after the operator selects the automatic set switch SW1, the operator then selects the side form operation switch SW3. Triggered by these, the control unit 61 on the operation panel 6 outputs an operation signal to the controllers of the pair of left - right side form drive cylinders 71, and performs a side form setting process (side form setting step shown in step S07 of FIG. 7) to extend the side form drive cylinders 71 by a predetermined amount. FIG. 19 is a diagram schematically showing the situation of the side form setting process.

[0128] In the side form setting process, by expanding the pair of left - right side forms 12, each side form 12 can be set at a predetermined formwork setting position. Note that the extension amount of each side form drive cylinder 71 controlled when setting the pair of left - right side forms 12 is set in advance However, an input operation on the touch panel 901 by the operator may be accepted, and the side form drive cylinder 71 may be extension - controlled according to the input value. Also, the pair of left - right side forms 12 may be set simultaneously or in sequence.

[0129] Note that, also in the wrap side region of the side form 12, similar to the top form 11, since it is installed so as to wrap around the front end side region of the existing lining concrete in the most recent covering work section ZB, side form crack prevention sensors (not shown) are respectively installed in the wrap side regions of the pair of left and right side forms 12. Each side form crack prevention sensor detects contact with the front end side region of the existing lining concrete when the side form 12 is extended during the side form setting process, and transmits the detection signal to the control unit 61. When the control unit 61 detects the operation of the side form crack prevention sensor during the side form setting process, it stops the extension operation of the actuated side form drive cylinder 71. Thereby, it is possible to avoid the wrap side region of the side form 12 being excessively pressed against the existing lining concrete during the side form setting process, and suppress cracking of the existing lining concrete. Note that, when the side form crack prevention sensor in the right side form 12 operates during the side form setting process, the right side form crack prevention lamp 910 on the operation panel 6 is lit. Similarly, when the side form crack prevention sensor in the left side form 12 operates, the left side form crack prevention lamp 911 on the operation panel 6 is lit.

[0130] From the above, the side form setting process (side form setting step) is completed. When the side form setting process (side form setting step) is completed, the operator selects and operates the invert form operation switch SW4 in a state where the automatic set switch SW1 is selected on the side form - invert form operation screen P2. Triggered by this, the control unit 61 on the operation panel 6 outputs an operation signal to the controllers of the pair of left and right invert form drive cylinders 72, and performs an invert form setting process (invert form setting step shown in step S08 of FIG. 7) to extend the invert form drive cylinders 72 by a predetermined amount. FIG. 20 is a diagram schematically showing the situation of the invert form setting process.

[0131] In the invert form set process, by expanding the pair of left and right invert forms 13, each invert form 13 can be set at a predetermined formwork set position. Note that although the extension amount of each drive cylinder 72 for the invert form, which is controlled when setting the pair of left and right invert forms 13, is set in advance, it is also possible to accept an input operation on the touch panel 901 by an operator and perform extension control of the drive cylinder 72 for the invert form according to the input value. Also, the pair of left and right invert forms 13 may be set simultaneously or in sequence.

[0132] Note that also in the wrap side region of the invert form 13, similar to the top form 11 and the side form 12, since it is installed so as to wrap around the front end side region of the existing lining concrete in the most recent lining work section ZB, an invert form crack prevention sensor (not shown) is installed in each of the wrap side regions of the pair of left and right invert forms 13. Each invert form crack prevention sensor detects contact with the front end side region of the existing lining concrete when the invert form 13 expands during the invert form set process, and transmits the detection signal to the control unit 61. When the control unit 61 detects the operation of the invert form crack prevention sensor during the invert form set process, it stops the extension operation of the drive cylinder 72 for the invert form on the operating side. Thereby, it is possible to avoid excessive pressing of the wrap side region of the invert form 13 against the existing lining concrete during the invert form set process, and suppress cracking of the existing lining concrete. Note that when the invert form crack prevention sensor in the right invert form 13 operates during the invert form set process, the right invert form crack prevention lamp 912 on the operation panel 6 is lit, and when the side form crack prevention sensor in the left side form 12 operates, the left invert form crack prevention lamp 913 on the operation panel 6 is lit. When the right invert form crack prevention sensor in the right invert form 13 operates during the invert form set process, the right invert form crack prevention lamp 912 on the operation panel 6 is lit, and when the side form crack prevention sensor in the left side form 12 operates, the left invert form crack prevention lamp 913 on the operation panel 6 is lit.

[0133] In the above-described manner, in the newly established lining work section ZN, the installation of the formwork body 1 of the center E at a predetermined formwork setting position is completed. Next, the operator selects and operates the operation selection screen return switch SW5 on the side form - invert form operation screen P2, whereby the touch panel 901 is switched to the operation selection screen P1. Then, when the operator selects the wife plate operation M7 on the operation selection screen P1 from the menu, the display screen of the touch panel 901 is switched to the wife plate operation screen P7 shown in FIG. 21. On the wife plate operation screen P7, a wife plate setting switch SW14, a wife plate demolding switch SW15, and an operation selection screen return switch SW5 are displayed. In the present embodiment, when the operator selects and operates the wife plate setting switch SW14 on the wife plate operation screen P7 of the operation panel 6, a wife plate is automatically set on the wife side of the formwork body 1 in the center E (the wife plate setting process shown in step S09 of FIG. 7).

[0134] FIG. 22 is a diagram for explaining a wife formwork device 14 installed on the wife surface of the formwork body 1 in the center E. The wife formwork device 14 includes a plurality of wife plate parts 141 arranged adjacent to each other along the wife surface of the lining placement space S so as to cover the wife surface of the lining placement space S formed between the inner wall surface F of the tunnel C and the formwork surface of the formwork body 1, and a drive cylinder 142 for driving the wife plate part 141 and the like. Each wife plate part 141 is a steel telescopic wife plate that is lifted and lowered by the drive cylinder 142, and is arranged adjacent to each other along the arch shape of the formwork body 1.

[0135] FIG. 22(a) shows the completed state of the wife plate set with the wife plate part 141 of the wife formwork device 14 installed at the wife plate set position covering the wife surface of the lining placement space S, and FIG. 22(b) shows the state where the wife plate part 141 is demolded. Note that FIG. 22 is a side view of the wife formwork device 14 along the longitudinal direction of the tunnel C.

[0136] The driving cylinder 142 in the wife formwork device 14 is attached to the transverse frame member 233 in the wife side region that supports the formwork body 1 at the center E. The driving cylinder 142 is a hydraulic or electric cylinder that operates based on an operation signal from the control unit 61 on the operation panel 6, and a wife plate portion 141 is connected to the tip side thereof. The driving cylinder 142 can move each wife plate portion 141 up and down along the approximate normal direction of the formwork surface 1A in the formwork body 1 by expanding and contracting. Thereby, by extending the driving cylinder 142, the wife plate portion 141 is made to enter the covering construction space S, and the wife plate set state (Fig. 22(a)) in which the wife formwork surface 141A of the wife plate portion 141 is arranged to cover the wife surface of the covering construction space S, and by contracting the driving cylinder 142, the wife plate portion 141 is retracted from the covering construction space S, and the wife plate stripping state (Fig. 22(b)) in which the wife surface of the covering construction space S is opened can be switched.

[0137] As shown in Fig. 22, an air bladder 143 is attached to the top 141B of the wife plate portion 141. The air bladder 143 has a longitudinal direction along the arch shape at the center E and is an air tube body that extends along the arch shape. The air bladder 143 expands by the air supplied from an air supply source (not shown). The control unit 61 on the operation panel 6 controls the air supply source of the air bladder 143 and can switch between the expanded state shown in Fig. 22(a) in which the air bladder 143 is expanded by air and the contracted state shown in Fig. 22(b) in which the air bladder 143 is deflated by removing the air from the air bladder 143.

[0138] Also, as shown in Fig. 22, the transverse frame member 233 of the center E is an overhanging portion 23 formed by protruding to the face side in the tunnel longitudinal direction from the front end in the formwork body 1. It has 3A. On the upper surface of the overhanging portion 233A of the horizontal frame member 233, a receiving member 145 having a receiving portion 145A for receiving the end portion of the support member 144 for supporting the shutter plate portion 141 from the face side against the concrete pressure during the placement of the covering concrete is fixed. The receiving portion 145A of the receiving member 145 is formed by a C-shaped steel or the like extending along the arch shape at the center E.

[0139] By controlling the shutter formwork device 14 configured as described above by the control unit 6 of the operation panel 6, automatic setting and automatic demolding of the shutter plate portion 141 are performed. That is, when the shutter plate set switch SW14 on the shutter plate operation screen P7 is selected and operated, the control unit 6 supplies air from an air supply source to the air bulk 143 in the shutter formwork device 14 to expand the air bulk 143, and outputs an operation signal to each drive cylinder 142 to extend each drive cylinder 142 by a predetermined amount. Here, the extension amount when controlling the extension of each drive cylinder 142 is set to a value such that the top portion 141B of the shutter plate portion 141 does not collide with the inner wall surface F of the tunnel C during extension, and a gap is formed between the two, and the gap is adjusted to be blocked by the expanded air bulk 143. Further, a crack prevention sensor for the shutter plate may be provided at an appropriate position of the shutter formwork device 14, and it can be configured such that the shutter plate portion 141 that rises during automatic setting does not press against the inner wall surface F of the tunnel C excessively. As shown in Fig. 22(a), when the automatic setting of the shutter plate portion 141 is completed, the support member 144 is installed so as to be interposed between the receiving portion 145A of the receiving member 145 and the shutter plate portion 141.

[0140] As described above, when the wife plate setting process is completed, the preparation for placing the shotcrete between the inner wall surface F of the tunnel C and the formwork body 1 in the newly constructed shotcrete section ZN is completed. Then, the operator switches to the operation selection screen P1 by selecting and operating the operation selection screen return switch SW5 on the wife plate operation screen P7 of the touch panel 901, and then ends the operation of the operation panel 6 by selecting the end M8 of the operation selection screen P1 from the menu. Then, the construction procedure of the shotcrete proceeds to step S10 in FIG. 7, and the shotcrete is placed between the inner wall surface F of the tunnel C and the formwork body 1 in the newly constructed shotcrete section ZN (shotcrete placing process).

[0141] When the placing of the shotcrete in the newly constructed shotcrete section ZN is completed, after performing predetermined curing, the support member 144 installed between the wife plate portion 141 and the receiving portion 145A is removed, and then the wife plate portion 141 of the wife formwork device 14 is automatically demolded by the control unit 6. The automatic demolding of the wife plate portion 141 is triggered when the wife plate demolding switch SW1 is selected and operated on the wife plate operation screen P7 of the operation panel 6. When the wife plate demolding switch SW1 is selected and operated, the control unit 61 deflates the air bulkhead 143 in the wife formwork device 14 and contracts each drive cylinder 142 in response to this. As a result, the wife plate portion 141 can be mechanically and automatically demolded. After that, by repeating the procedures of each step described in FIG. 7, the shotcrete is sequentially constructed for the newly constructed shotcrete section next.

[0142] As described above, according to the automatic setting system and the automatic setting method of the center E in the present embodiment, the installation of the formwork body 1 of the center E can be mechanized and automated. Thereby, the construction of the shotcrete on the inner wall surface F of the tunnel C can be carried out in a short time and without much effort.

[0143] In particular, according to the automatic setting system of the center E according to the present embodiment, it is provided with an inclination detection device (front roof beam inclination detection unit 8A, rear roof beam inclination detection unit 8B) for detecting the inclination postures of the front roof beam 23 and the rear roof beam 26. The control unit 61 on the operation panel 6 executes a leveling process of automatically leveling the front roof beam 23 and the rear roof beam 26 by transmitting an operation signal to each of the lifting devices 3A to 3D based on the detection information of the inclination detection device. According to this, the inclination postures of the front roof beam 23 and the rear roof beam 26 can be detected without performing three-dimensional surveying using surveying instruments such as the total station R, and the leveling process can be performed. Therefore, the labor of three-dimensional surveying is reduced, and the time required for surveying can be reduced. Thus, the installation of the center for placing the shotcrete on the inner wall surface F of the tunnel C can be automated more efficiently than before.

[0144] Also, in the present embodiment, in each of the front roof beam inclination detection unit 8A and the rear roof beam inclination detection unit 8B, the liquid tank 81 and the pressure gauge 82 are provided at positions substantially symmetric with respect to the center line L1 in the center width direction of the center. If the first length dimension along the center width direction from the liquid tank 81 to the center line L1 in the front roof beam inclination detection unit 8A and the second length dimension along the center width direction from the liquid tank 81 to the center line L1 in the rear roof beam detection unit 8B are set to be substantially equal, and the height differences between the respective liquid tanks 81 and the pressure gauges 82 in the front and rear are set to be equal, then the horizontal posture corresponding pressure value Prb corresponding to when the front roof beam 23 is in a horizontal posture and the horizontal posture corresponding pressure value Prb corresponding to when the rear roof beam 26 is in a horizontal posture have the same value. Therefore, the structure of the inclination detection device can be made simpler.

[0145] Also, in the automatic setting system of the center E in the present embodiment, a first sighting target 27 is installed on either one of the pair of left and right front right leg portions 21 and front left leg portions 22 that extend downward from the front top beam 23 in the front portal frame 20A, and a second sighting target 28 is installed on either one of the pair of left and right rear right leg portions 24 and rear left leg portions 25 that extend downward from the rear top beam 26 in the rear portal frame 20B. As described above, in the present embodiment, an inclination detection device (front top beam inclination detection unit 8A, rear top beam inclination detection unit 8B) is provided, and since the horizontal setting process of the center E can be performed without performing three-dimensional surveying using a surveying instrument, when the control unit 61 performs the center top form height setting process, the surveying targets installed one by one on the front portal frame 20A and the rear portal frame 20B are three-dimensionally surveyed, and the top form 11 at the center E can be installed at a predetermined set position. That is, according to the automatic setting system of the center E in the present embodiment, it is not necessary to perform three-dimensional surveying by sighting the sighting targets attached to the four left and right leg portions in the front and rear portal frames as in the conventional method, and the labor and time required for surveying can be reduced compared to the conventional method.

[0146] Furthermore, according to the present embodiment, since it is not necessary to install the sighting targets at four locations on the left and right legs in each of the front and rear portal frames at the center, the first sighting target 27 and the second sighting target 28 can be attached only to one of the legs on the same side in the tunnel width direction among the pair of left and right front legs (front right leg 21 and front left leg 22) and the pair of left and right rear legs (rear right leg 24 and rear left leg 25). That is, the sighting target at the center E can be arranged by shifting it to only one of the right side region or the left side region with reference to the center width direction center line L1. According to the present embodiment, since it is not necessary to install sighting targets on both the right side region and the left side region across the center width direction center line L1, it is not necessary to install the total station R (surveying instrument) for sighting the sighting target near the center in the tunnel width direction, and the total station R (surveying instrument) can be installed closer to the other side in the tunnel width direction. According to this, it is possible to prevent the total station R (surveying instrument) installed in the tunnel C from obstructing the movement lines of other construction machines and workers, and conversely, to prevent the smooth surveying work from being hindered by the intrusion of other construction machines and people between the total station R (surveying instrument) and the sighting target.

[0147] Furthermore, in the automatic setting system of the center E in the present embodiment, the control unit 61 on the operation panel 6 acquires the required forward and backward movement amount DB of the gantry 2 in the tunnel longitudinal direction calculated based on the measurement information of the total station R (surveying instrument) before the horizontal extension process, and transmits an operation signal corresponding to the required forward and backward movement amount DB to the traveling device to automatically match the position of the center E in the tunnel longitudinal direction with a predetermined new lining position. The center front and rear position setting process is executed. According to this, it becomes possible to mechanically and automatically set the position of the center E in the tunnel longitudinal direction to the new lining position, and the construction of the lining concrete can be carried out in a shorter time without much effort.

[0148] Furthermore, in the automatic setting system of the center E in the present embodiment, the control unit 61 on the operation panel 6, after the center front and rear position setting process and before the center top form height setting process, based on the measurement information of the total station R (surveying instrument), obtains the first left-right required movement amount DW1 (the left-right required movement amount of the first transverse feed device) and the second left-right required movement amount DW2 (the left-right required movement amount of the second transverse feed device) in each of the front portal frame 20A and the rear portal frame 20B in the tunnel width direction, and transmits an operation signal corresponding to the first left-right required movement amount DW1 (the left-right required movement amount of the first transverse feed device) to the first transverse feed device and an operation signal corresponding to the second left-right required movement amount DW2 (the left-right required movement amount of the second transverse feed device) to the second transverse feed device, thereby executing the center left-right position setting process for automatically matching the position of the center E in the tunnel width direction with the newly constructed lining position. According to this, it becomes possible to mechanically and automatically set the position of the center E in the tunnel width direction to the newly constructed lining position, and the construction of the lining concrete can be carried out in a shorter time and with less effort.

[0149] In addition, according to the automatic setting system of the center E in the present embodiment, the top form 11, side forms 12, invert form 13, installation and removal of the gable form in the formwork body 1, and operations such as chamfering after concrete placement can be mechanically and automatically performed, contributing to further reduction of the labor and time required for the construction of the lining concrete.

[0150] Furthermore, according to the automatic setting system of the center E in the present embodiment, it includes a computer 9 in which tunnel information including the linear information and cross-sectional information of the tunnel C is stored. When the center front and rear position setting process is executed, the computer 9 calculates the required forward and backward movement amount DB based on the measurement information of the total station R (surveying instrument) and the tunnel information, and transmits it to the control unit 61 of the operation panel 6. When the center left and right position setting process is executed, the first left and right required movement amount DW1 (required movement amount of the first lateral feed device left and right) and the second left and right required movement amount DW2 (required movement amount of the first lateral feed device left and right) calculated based on the measurement information of the total station R and the tunnel information are transmitted to the control unit 61. When the center ceiling form height setting process is executed, the first up and down required movement amount DH1 (required movement amount of the first sighting target up and down) and the second up and down required movement amount DH2 (required movement amount of the second sighting target up and down) calculated based on the measurement information of the total station R and the tunnel information are transmitted to the control unit 61. According to this, the control unit 61 in the operation panel 6 can accurately and smoothly install the center E based on the movement amounts of each drive cylinder and the like received from the computer 9.

[0151] However, the automatic setting system of the center E in this embodiment is not limited to the above mode. The computer 9 does not necessarily need to be a separate device from the total station R (surveying instrument), and the computer 9 may be incorporated into the total station R. Further, the computer 9 may be installed in the center E, for example, may be incorporated into the operation panel 6. Further, tunnel information including the linear information and cross-sectional information of the tunnel C may be stored in the storage unit 66 in the operation panel 6. In this case, the operation panel 6 receives the coordinate data of the first sighting target 27 and the second sighting target 28 measured by the total station R (surveying instrument) from the total station R, and based on the coordinate data acquired from the total station R and the tunnel information stored in the storage unit 66, when the control unit 61 controls each drive cylinder of the center E, etc., the driving amount (front and rear required movement amount DB, first left and right required movement amount DW1 (left and right required movement amount of the first cross-feed device) and second left and right required movement amount DW2 (left and right required movement amount of the second cross-feed device), first up and down required movement amount DH1 (up and down required movement amount of the first sighting target) and second up and down required movement amount DH2 (up and down required movement amount of the second sighting target), etc.) may be calculated.

[0152] <Embodiment 2> Next, the automatic setting system of the center E according to Embodiment 2 will be described. The automatic setting system of the center E according to Embodiment 2 is substantially the same as Embodiment 1 except that the inclination detection device is different from Embodiment 1. Hereinafter, the differences between the automatic setting system 2 of the center E according to Embodiment 2 and Embodiment 1 will be mainly described, and the detailed description of the same configuration as Embodiment 1 will be omitted using the same reference numerals.

[0153] FIG. 23 is a diagram showing the automatic setting system of the center E2 according to Embodiment 2. In the center E2 according to Embodiment 2, an inclination detection device 80 is installed instead of the front gantry inclination detection unit 8A and the rear gantry inclination detection unit 8B according to Embodiment 1. FIG. 24 is a diagram showing the inclination detection device 80 according to Embodiment 2.

[0154] The inclination detection device 80 according to Embodiment 2 includes first pressure gauges 821 to 824, a single liquid tank 81, and communication pipelines 830 that connect each of the first pressure gauges 821 to 824 and the liquid tank 81. The liquid tank 81 is an open-to-atmosphere water tank, similar to that in Embodiment 1.

[0155] The first pressure gauge 821 and the second pressure gauge 822 are provided at positions corresponding to the front crossbeam 23 in the center longitudinal direction and are respectively provided at positions substantially symmetric with respect to the center line (center width direction center line) L1 in the center width direction. Specifically, the first pressure gauge 821 and the second pressure gauge 822 are respectively attached to the front crossbeam 23. And the first width direction interval Lw1 from the center width direction center line L1 to the first pressure gauge 821 along the center width direction and the second width direction interval Lw2 from the tunnel width direction center line L1 to the second pressure gauge 822 along the center width direction are substantially equal to each other.

[0156] The third pressure gauge 823 and the fourth pressure gauge 824 are provided at positions corresponding to the rear crossbeam 26 in the center longitudinal direction and are respectively provided at positions substantially symmetric with respect to the center line (center width direction center line) L1 in the center width direction. Specifically, the third pressure gauge 823 and the fourth pressure gauge 824 are respectively attached to the rear crossbeam 26. And the third width direction interval Lw3 from the center width direction center line L1 to the third pressure gauge 823 along the center width direction and the fourth width direction interval Lw4 from the center width direction center line L1 to the fourth pressure gauge 824 along the center width direction are substantially equal to each other.

[0157] Further, the single liquid tank 81 is attached to a support column (not shown) erected from the central positions of the central front portal frame 20A (front top beam 23) and the central rear portal frame 20B (rear top beam 26) along the longitudinal direction of the tunnel among the central support beams connecting the front portal frame 20A (front top beam 23) and the rear portal frame 20B (rear top beam 26) along the longitudinal direction of the tunnel. That is, the first pressure gauge 821 and the second pressure gauge 822, and the third pressure gauge 823 and the fourth pressure gauge 824 are arranged at substantially symmetric positions along the center front-rear direction with respect to the center line (hereinafter referred to as the "center front-rear direction center line") L2 in the center front-rear direction. More specifically, the first front-rear interval La1 along the center front-rear direction from the first pressure gauge 821 and the second pressure gauge 822 to the center front-rear direction center line L2 is substantially equal to the second front-rear interval La2 along the center front-rear direction from the third pressure gauge 823 and the fourth pressure gauge 824 to the center front-rear direction center line L2.

[0158] Furthermore, in the center height direction, all of the first pressure gauge 821 to the fourth pressure gauge 821 are installed at the same height, and the liquid tank 81 is installed at a position higher than the first pressure gauge 821 to the fourth pressure gauge 821.

[0159] In addition, the communication pipeline 830 in the inclination detection device 80 is arranged along the front top beam 23 together with a front pipeline portion 831 that communicates the first pressure gauge 821 and the second pressure gauge 822, a rear pipeline portion 832 that is arranged along the rear top beam 26 and communicates the third pressure gauge 823 and the fourth pressure gauge 824, and a central pipeline portion 833 that is arranged along the central support beam and communicates the central portions in the center width direction of the front pipeline portion 831 and the rear pipeline portion 832. The liquid tank 81 is connected to the central portion in the longitudinal direction of the central pipeline portion 833. In addition, the communication pipeline 830 (front pipeline portion 831, rear pipeline portion 832, central pipeline portion 833) is formed of a hose member or the like having appropriate flexibility.

[0160] In the inclination detection device 80 configured as described above, the detected values (water pressures) detected by the pressure gauges 821 to 824 are values corresponding to the liquid levels (water levels) H1, H2, H3, and H4 of the liquid tank 81 based on the heights of the pressure gauges 821 to 824. For example, when the front cross beam 23 (rear cross beam 26) is horizontal in the tunnel width direction, the liquid levels H1 and H2 are equal, so the detected values (water pressures) of the first pressure gauge 821 and the second pressure gauge 822 (the third pressure gauge 823 and the fourth pressure gauge 824) are equal. Also, when the heights of the first pressure gauge 821 and the third pressure gauge 823 (the second pressure gauge 822 and the fourth pressure gauge 824) are equal, the liquid level H1 and the liquid level H3 (the liquid level H2 and the liquid level H4) are equal, so the detected values (water pressures) of the first pressure gauge 821 and the third pressure gauge 823 (the second pressure gauge 822 and the fourth pressure gauge 824) are equal. Therefore, when the front cross beam 23 and the rear cross beam 26 at the center E are horizontal and have the same height, the detected values of all the pressure gauges 821 to 824 are the same value, indicating that the whole is horizontal.

[0161] Also, when the front cross beam 23 (rear cross beam 26) inclines up and down along the tunnel width direction, resulting in a difference in height between one end side and the other end side in the center width direction of the front cross beam 23 (rear cross beam 26), the difference in the detected values detected by the first pressure gauge 821 and the second pressure gauge 822 (the third pressure gauge 823 and the fourth pressure gauge 824) increases according to the inclination amount of the front cross beam 23 (rear cross beam 26). Also, when the heights of the front cross beam 23 and the rear cross beam 26 are different due to the gantry 2 inclining up and down along the tunnel longitudinal direction, the difference in the detected values detected by the first pressure gauge 821 and the third pressure gauge 823 (the second pressure gauge 822 and the fourth pressure gauge 824) increases according to the inclination amount of the gantry 2 in the tunnel longitudinal direction.

[0162] In the automatic setting system of the center E in Embodiment 2, the inclination detection device 80 detects the inclination postures of the front top beam 23 of the front gantry frame 20A and the rear top beam 26 of the rear gantry frame 20B, and the horizontal extension process described with reference to FIG. 7 is performed by the control unit 61 of the operation panel 6. For example, during the horizontal extension process, the control unit 61 independently controls the extension and contraction of the front right lifting device 3A and the front left lifting device 3B so that the detection values output by the first pressure gauge 821 and the second pressure gauge 822 are equal to each other, thereby adjusting the front top beam 23 to a horizontal posture. Further, the control unit 61 independently controls the extension and contraction of the rear right lifting device 3C and the rear left lifting device 3D so that the detection values output by the third pressure gauge 823 and the fourth pressure gauge 824 are equal to each other, thereby adjusting the rear top beam 26 to a horizontal posture.

[0163] In addition, the inclination detection device 80 in the present embodiment can easily grasp not only the inclination state along the tunnel width direction of the front top beam 23 and the rear top beam 26 in the center E but also the inclination state along the tunnel longitudinal direction. Therefore, during the horizontal extension process, the control unit 61 of the operation panel 6 may independently control the extension and contraction of each lifting device 3A to 3D so that the detection values detected by each pressure gauge 821 to 824 are all equal. According to this, not only can the front top beam 23 and the rear top beam 26 in the center E be adjusted to a horizontal posture along the tunnel width direction, but also the heights of the front top beam 23 and the rear top beam 26 can be made equal. Therefore, the construction time of the tunnel lining concrete of the tunnel C can be further shortened. Further, according to the inclination detection device 80 in the present embodiment, by using a single liquid tank 81, the structure of the inclination detection device 80 and its maintenance can be made simpler. Inclination detection device 80 and its maintenance can be made simpler.

[0164] <Embodiment 3> Next, the automatic setting system of the center E according to Embodiment 3 will be described. In Embodiment 1, when installing the position of the center E in the longitudinal direction of the tunnel at the position of the newly constructed lining, as shown in FIG. 12, the rear end region (shaft side) of the formwork body 1 in the longitudinal direction of the tunnel was overlapped (duplicated) with the front end region of the nearest lining section ZB. However, in Embodiment 3, an aspect (non-lap center) will be described in which the rear end region of the formwork body 1 is installed without overlapping with the front end region of the nearest lining section ZB. Note that the basic structure of the center E and its automatic setting system in the present embodiment, as well as the basic construction procedure of the lining concrete using these, are common to Embodiment 1. Hereinafter, Embodiment 3 will be described centering on the differences from Embodiment 1.

[0165] FIG. 25 is a diagram for explaining a state in which the center front and rear position setting process of automatically aligning the position of the center E in the longitudinal direction of the tunnel with the position of the newly constructed lining is completed in Embodiment 3. As described above, in the center front and rear position setting process of the present embodiment, the center E is installed at a position where the rear end 103 of the formwork body 1 exactly coincides with the front end C1 of the lining concrete SC in the longitudinal direction of the tunnel. Note that since the center E in the present embodiment has a joint formation structure shown in FIG. 26 described later, joints are formed at the joints between the lining concretes SC for each lining section. Cc shown in FIG. 25 is a notch in the concrete formed on the inner periphery of the front end of the existing lining concrete SC in the nearest lining section ZB for forming a joint between the existing lining concrete SC in the nearest lining section ZB and the lining concrete SC to be newly placed in the newly constructed lining section ZW. Also, the reference sign C2 is the inner peripheral surface of the existing lining concrete SC.

[0166] FIG. 26 is a diagram for explaining the joint formation structure according to Embodiment 3. Specifically, FIG. 26 shows the rear end region of the center E in a state where the self-propelled installation into the newly constructed lining section ZW is completed after passing through the demolding process S01 to the wife plate setting process S09 described in FIG. 7 of Embodiment 1. FIG. 27 is a cross-sectional view of the joint formation structure according to Embodiment 3 and is a cross-sectional view taken along line I-I of FIG. 26.

[0167] In Embodiment 3 as described above, since the center E is installed in the non-wrapped center mode, in the center front and rear position setting process, as shown in FIGS. 25 and 26, the necessary forward and backward movement amount DB of the center E (gantry 2) is calculated so that the rear end 103 of the formwork body 1 matches the position of the front end C1 of the covering concrete SC in the longitudinal direction of the tunnel, and the center E (gantry 2) is automatically moved to the new covering position based on the necessary forward and backward movement amount DB. Further, in the above-described top form height setting process, side form setting process, and invert form setting process, the outer peripheral surface 104 in the rear end region of the formwork body 1 (outer peripheral surface top form 11, side form 12, invert form 13) is positioned substantially on the same plane as the inner peripheral surface C2 of the existing covering concrete SC in the immediately preceding covering work section ZB, for example.

[0168] At the rear end 103 of the formwork body 1 in the center E, stays 101 project at a plurality of positions in the circumferential direction (see FIG. 27), and a plate-shaped receiving member 102 extending in the circumferential direction of the formwork 1 is installed and supported by these stays 101. The receiving member 102 projects rearward from the rear end 103 of the formwork body 1 and has a support surface 102A for supporting the support leg 301 in the joint material 300 described later. The support surface 102A of the receiving member 102 is located a certain amount inward from the outer peripheral surface 104 of the formwork body 1 (see FIGS. 25 and 26), and its plate width direction (the left-right direction in FIG. 26) extends a predetermined length inward to a position away from the inner peripheral surface C2 of the existing covering concrete SC. Further, the receiving member 102 extends in the circumferential direction over the entire section of the outer peripheral surface top form 11, side form 12, and invert form 13 that constitute the formwork body 1.

[0169] Also, a joint material 300 is disposed along the outer peripheral surface 104 in the rear end region of the formwork body 1 (outer peripheral surface top form 11, side form 12, invert form 13). The joint material 300 is an elongated body with a substantially triangular cross-section and is obtained by extrusion molding a rubber material or the like. The joint material 300 positions the bottom surface 304 of the triangular cross-section on the outer peripheral surface 104 in the rear end region of the formwork body 1, and is capable of moving forward and backward in the near and far directions (left and right direction in FIG. 26) with respect to the front end portion C1 of the existing covering concrete SC along the outer peripheral surface 104. Note that the forward and backward movement direction of the joint material 300 coincides with the front and back direction of the formwork body 1, that is, the longitudinal direction of the tunnel.

[0170] Also, as shown in FIG. 26, on the bottom surface of the rear end portion of the joint material 300 protruding from the outer peripheral surface 104 on the rear end 103 side of the formwork body 1 toward the existing covering concrete SC, a wall-like support leg portion 301 having a certain thickness protruding toward the support surface 102A (outer peripheral surface) of the receiving member 102 is formed, and the protruding end surface (lower end surface) of the support leg portion 301 is in contact with the support surface 102A (outer peripheral surface) of the receiving member 102. By such a support leg portion 301, the joint material 300 protruding from the rear end 103 side of the formwork body 1 is held substantially on the extension of the outer peripheral surface 104 in the formwork body 1.

[0171] A through hole 301A parallel to the support surface 102A of the receiving member 102 is provided at an appropriate position in the circumferential direction in the support leg portion 301 of the joint material 300, and a linear traction member Rp having one end fixed to the side surface of the support leg portion 301 is inserted through the through hole 311 and extends along the inner side position of the existing covering concrete SC. However, the method of mooring one end of the traction member Rp to the support leg portion 301 is not limited to the above aspect. Further, the traction member may be a linear member such as a rope, a string, or a wire. Further, a circular through hole 302 is extended along the longitudinal direction at the approximate center in the cross-section of the joint material 300, and by passing a fixing rope (not shown) through the through hole 302 and tightening both ends thereof, the joint material 300 is reduced in diameter and deformed and fixed to the outer peripheral surface 104 of the formwork body 1.

[0172] On the support surface 102A of the receiving member 102, a plurality of cushion bodies 500 having a thickness approximately the same as the height (thickness) of the support leg portion 301 are joined and fixed at intervals in the circumferential direction (see Fig. 27). The cushion body 500 is formed of an elastic member such as rubber, for example. When setting the outer peripheral surface 104 in the rear end region of the formwork body 1 (outer peripheral surface top form 11, side form 12, invert form 13) at a height substantially flush with the inner peripheral surface C2 of the covering concrete SC in the immediately adjacent covering work section ZB, the cushion body 500 is a buffer material for preventing the receiving member 102 from directly colliding with the inner peripheral surface C2 of the existing covering concrete SC. Further, the cushion body 500 can be used to confirm the position (step) between the inner peripheral surface C2 of the existing covering concrete SC and the outer peripheral surface 104 in the rear end region of the formwork body. Also, at appropriate positions on the receiving member 2, crack prevention sensors 600 (limit switches) are provided. The crack prevention sensors 600 have actuators 610 that move forward and backward, and the actuators 610 are installed in a state biased toward the inner peripheral surface C2 of the existing covering concrete SC. The crack prevention sensors 600 are arranged at appropriate positions on the receiving member 102 corresponding to the outer peripheral surface top form 11, side form 12, and invert form 13 that constitute the formwork body 1.

[0173] In the present embodiment, when setting the outer peripheral surface 104 in the rear end region of the formwork body 1 (outer peripheral surface top form 11, side form 12, invert form 13) at a height substantially flush with the inner peripheral surface C2 of the covering concrete SC in the immediately adjacent covering work section ZB in the top form height setting step, side form setting step, and invert form setting step, the cushion body 500 is used for buffering to prevent the receiving member 102 from directly colliding with the inner peripheral surface C2 of the existing covering concrete SC, and the crack prevention sensor 600 is activated when the tip of the actuator 610 abuts against the inner peripheral surface C2. In each of the top form height setting step, side form setting step, and invert form setting step, the crack prevention sensor 600 is on the outer periphery It is detected that the rear end regions of the top form 11, side form 12, and invert form 13 are in contact with the inner peripheral surface C2 of the front end region in the covering concrete SC. When the detection signal by the crack prevention sensor 600 is transmitted to the control unit 61, each device for operating the outer peripheral surface top form 11, side form 12, and invert form 13 in each of the top form height setting process, side form setting process, and invert form setting process (in the top form height setting process, the rear right lifting device 3C and rear left lifting device 3D, in the side form setting process, the side form driving cylinder 71, and in the invert form setting process, the invert form driving cylinder 72) stops. As a result, the outer peripheral surface 104 in the rear end region of the formwork body 1 (outer peripheral surface top form 11, side form 12, invert form 13) can be set at a height substantially on the same plane as the inner peripheral surface C2 of the covering concrete SC in the most recent covering work section ZB.

[0174] The joint material 300 in the joint formation structure described above is arranged at the initial position shown by the dashed line in FIG. 26 and is located on the outer peripheral surface 104 on the rear end 103 side of the formwork body 1. In the present embodiment, after the automatic setting of the center E is completed and before the covering concrete placing process, the joint material 300 is moved toward the existing covering concrete SC by pulling the traction member Rp as shown by the white arrow in FIG. 26. As a result, as shown by the solid line in FIG. 26, the inclined side surface 303 of the joint material 300 is made to coincide with the slope of the notch Cc formed in the inner periphery of the front end portion of the existing covering concrete SC, and the joint material 300 can be positioned at the notch insertion position where the substantially front half region of the joint material 300 is inserted into the notch Cc.

[0175] While moving the joint material 300 from the initial position (the dashed line in Fig. 26) to the notch insertion position (the solid line in Fig. 26), the joint material 300 is constantly supported on the receiving member 102 by the support leg portion 301. Therefore, the posture change of the joint material 300 is suppressed during the above movement, and the joint material 300 is properly inserted into the notch Cc of the existing covering concrete SC. As a result, a new concrete placing space S continuous with the existing covering concrete SC is formed between the outer peripheral surface 104 of the formwork body 1 and the inner wall surface F of the tunnel C (see Fig. 25 etc.), and a protruding portion P for forming a joint having a triangular concave cross-sectional shape is formed at the joint between the front end of the existing covering concrete SC and the new concrete placing space S by the joint material 300.

[0176] Also, when automatically setting the center E as described above, it is conceivable that an error may occur in the moving position and the rising position of the formwork body 1 within a certain range. Even in such a case, according to the joint forming structure according to Embodiment 3, when the formwork body 1 approaches the existing covering concrete SC too much with respect to the normal target installation position shown in Fig. 26 (see Fig. 28) or conversely when it is too separated (see Fig. 29), the support leg portion 301 is always positioned on the support surface 102A of the receiving member 102, and the joint material 300 is supported on the support surface 102A. Therefore, the posture of the joint material 300 does not change, and in any case, the protruding portion P for forming a joint having a triangular concave cross-sectional shape is properly formed.

[0177] Also, when the formwork body 1 is displaced downward (see Fig. 30) or conversely displaced upward (see Fig. 31) with respect to the normal target installation position shown in Fig. 26, the support leg portion 301 is always positioned on the support surface 102A of the receiving member 102, and since the joint material 300 is supported on the support surface 102A, the posture of the joint material 300 does not change. Also, the joint material 300 is slightly displaced downward or upward with respect to the normal position while being in contact with the slope of the notch Cc, and due to this, the triangular concave cross-sectional shape of the joint formed by the protruding portion P becomes a slightly collapsed shape, but there is no problem in practical use.

[0178] According to the joint forming structure applied to the present embodiment, the joint member 300 having the support leg portion 301 can be integrally formed simply and inexpensively by extrusion molding or the like, and the receiving member 102 for receiving the support leg portion 3 01 may also be a simple long plate-shaped member extending in the circumferential direction with a predetermined width. Therefore, the joint forming structure can be realized simply and inexpensively overall.

[0179] Then, the formwork body 1 is positioned at a position where it does not interfere with the existing covering concrete SC in the longitudinal direction, and a cushion body 500 is provided on the receiving member 102 so that the receiving member 102 does not directly collide with the inner peripheral surface C2 of the existing covering concrete SC. At the same time, a crack prevention sensor 600 (limit switch) is provided to reliably prevent the collision between the receiving member 102 and the inner peripheral surface C2 of the existing covering concrete SC. Therefore, it is possible to effectively prevent the inner peripheral surface C2 of the existing covering concrete SC from being excessively pushed up and causing cracks in the covering concrete SC.

[0180] Note that the cushion body 500 and the crack prevention sensor 600 are not necessarily required, and the cross-sectional shape of the joint member 300 is not limited to a triangular cross-section.

[0181] As described above, the preferred embodiments of the present invention have been described. However, the present invention can be implemented by combining the embodiments as much as possible.

Explanation of Reference Numerals

[0182] C... Tunnel E... Center R... Total Station 1... Formwork Body 2... Gantry 3A~3D... Lifting Device 4A~4D... Cross Feeding Device 5A~5D... Traveling Device 6... Operation Panel 8A... Inclination Detection Unit for Front Girder 8B... Inclination Detection Unit for Rear Girder 9... Computer 11···Sky form 12···Side form 13···Invert form 20A···Front portal frame 20B···Rear portal frame 23···Front ceiling beam 26···Rear ceiling beam 27···First sighting target 28···Second sighting target

Claims

1. An automatic centering system for a centering that can travel on a pair of left and right rails laid along the longitudinal direction of a tunnel and for placing shotcrete on the inner wall surface of the tunnel, The centering includes A gantry formed by connecting a front gantry frame and a rear gantry frame arranged at intervals along the longitudinal direction of the tunnel to each other, A formwork body having a front top beam of the front gantry frame and a top form supported by a rear top beam of the rear gantry frame, and has A front left lifting device and a front right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right front legs extending downward from the front top beam in the front gantry frame, A rear left lifting device and a rear right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right rear legs extending downward from the rear top beam in the rear gantry frame, A control unit that controls these by transmitting an operation signal to each lifting device, An inclination detection device that detects the inclination postures of the front top beam and the rear top beam, A first sighting target attached to either one of a pair of left and right front legs extending downward from the front top beam in the front gantry frame, A second sighting target attached to either one of a pair of left and right rear legs extending downward from the rear top beam in the rear gantry frame, A surveying instrument that measures the three-dimensional position coordinates of the first sighting target and the second sighting target, and is provided with The control unit executes a leveling process of automatically leveling the front overhead beam and the rear overhead beam by transmitting an operation signal to each lifting device based on the detection information of the inclination detection device. Further, after the leveling process, the required vertical movement amounts of the first sighting target and the required vertical movement amounts of the second sighting target for each of the front portal frame and the rear portal frame in the tunnel vertical direction, which are calculated based on the measurement information of the surveying instrument, are obtained, and an operation signal corresponding to the required vertical movement amount of the first sighting target is transmitted to the front left lifting device and the front right lifting device, and an operation signal corresponding to the required vertical movement amount of the second sighting target is transmitted to the rear left lifting device and the rear right lifting device to execute a centering formwork height setting process for adjusting the height of the formwork. An automatic centering system.

2. An automatic centering system for a centering that can travel on a pair of left and right rails laid along the longitudinal direction of a tunnel and for placing shotcrete on the inner wall surface of the tunnel, The centering includes A gantry formed by connecting a front portal frame and a rear portal frame arranged at intervals along the longitudinal direction of the tunnel to each other, A formwork body having a formwork supported by a front overhead beam of the front portal frame and a rear overhead beam of the rear portal frame, and has A front left lifting device and a front right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right front legs extending downward from the front overhead beam in the front portal frame, A rear left lifting device and a rear right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right rear legs extending downward from the rear overhead beam in the rear portal frame, A control unit that controls these by transmitting an operation signal to each lifting device, An inclination detection device that detects the inclination postures of the front overhead beam and the rear overhead beam, A first aiming target attached to either one of a pair of left and right front legs extending downward from the front top beam in the front portal frame, A second aiming target attached to either one of a pair of left and right rear legs extending downward from the rear top beam in the rear portal frame, A surveying instrument for measuring the three-dimensional position coordinates of the first aiming target and the second aiming target, and comprising Based on the detection information of the inclination detection device, the control unit executes a leveling process of automatically setting the front top beam and the rear top beam to a horizontal posture by transmitting an operation signal to each lifting device, The first aiming target and the second aiming target are respectively attached to one leg on the same side in the tunnel width direction among the pair of left and right front legs and the pair of left and right rear legs. An automatic centering system.

3. An automatic centering system for a tunnel lining formwork that can travel on a pair of left and right rails laid along the tunnel longitudinal direction and place shotcrete on the inner wall surface of the tunnel, wherein the centering system is a gantry formed by connecting a front portal frame and a rear portal frame arranged at intervals along the tunnel longitudinal direction to each other, a formwork body having a top form supported by a front top beam of the front portal frame and a rear top beam of the rear portal frame, and having a front left lifting device and a front right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right front legs extending downward from the front top beam in the front portal frame, a rear left lifting device and a rear right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right rear legs extending downward from the rear top beam in the rear portal frame, a control unit that controls these by transmitting an operation signal to each lifting device, An inclination detection device that detects the inclination postures of the front overhead beam and the rear overhead beam, A first sighting target attached to either one of a pair of left and right front legs extending downward from the front overhead beam in the front gantry frame, In the rear gantry frame, any one of A second sighting target attached to either one of a pair of left and right rear legs extending downward from the rear overhead beam, A surveying instrument that measures the three-dimensional position coordinates of the first sighting target and the second sighting target, A traveling device that operates in response to an operation signal and causes the gantry to travel along the rail, is provided with The control unit executes a leveling process of automatically leveling the front overhead beam and the rear overhead beam by transmitting an operation signal to each lifting device based on the detection information of the inclination detection device. Further, before the leveling process, the necessary forward and backward movement amount of the gantry in the longitudinal direction of the tunnel calculated based on the measurement information of the surveying instrument is obtained, and the position of the gantry in the longitudinal direction of the tunnel at the center is automatically adjusted to a predetermined new lining position by transmitting an operation signal corresponding to the necessary forward and backward movement amount to the traveling device. The control unit executes a center front and rear position setting process of matching, An automatic setting system for the center.

4. An automatic setting system for a center that can travel on a pair of left and right rails laid along the longitudinal direction of a tunnel and that places lining concrete on the inner wall surface of the tunnel, The center is A gantry formed by connecting a front gantry frame and a rear gantry frame arranged at intervals along the longitudinal direction of the tunnel to each other, A formwork body having a front overhead beam of the front gantry frame and a top form supported by a rear overhead beam in the rear gantry frame, has A front left lifting device and a front right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right front legs extending downward from the front overhead beam in the front gantry frame, A rear left lifting device and a rear right lifting device that operate in response to an operating signal and independently lift and lower a pair of left and right rear legs extending downward from the rear top beam in the rear portal frame, A control unit that controls these by transmitting an operating signal to each lifting device, An inclination detection device that detects the inclination posture of the front top beam and the inclination posture of the rear top beam, and comprising, The control unit executes a leveling process of automatically leveling the front top beam and the rear top beam by transmitting an operating signal to each lifting device based on the detection information of the inclination detection device. Further, the inclination detection device includes a first pressure gauge and a second pressure gauge provided at positions corresponding in the center front-rear direction to the front top beam and respectively provided at positions substantially symmetric with respect to the center width direction center line, a third pressure gauge and a fourth pressure gauge provided at positions corresponding in the center front-rear direction to the rear top beam and respectively provided at positions substantially symmetric with respect to the center width direction center line, a single liquid tank of an atmosphere-open type, and communication pipelines respectively communicating each of the first to fourth pressure gauges with the liquid tank. The width direction interval along the center width direction from the first pressure gauge to the center width direction center line is substantially equal to the width direction interval along the center width direction from the third pressure gauge to the center width direction center line. The first pressure gauge and the second pressure gauge and the third pressure gauge and the fourth pressure gauge are provided at positions substantially symmetric with respect to the center front-rear direction center line, and the first to fourth pressure gauges are provided at the same height positions respectively. An automatic centering system for the center.

5. An automatic centering method for a center that can travel on a pair of left and right rails laid along the tunnel longitudinal direction and place shotcrete on the inner wall surface of the tunnel, The center is A gantry formed by connecting a front portal frame and a rear portal frame arranged at intervals along the tunnel longitudinal direction to each other, Supported by the front top beam of the front portal frame and the rear top beam of the rear portal frame A formwork body having a top form supported A front left lifting device and a front right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right front legs extending downward from the front top beam in the front portal frame A rear left lifting device and a rear right lifting device that operate in response to an operation signal and independently lift and lower a pair of left and right rear legs extending downward from the rear top beam in the rear portal frame A control unit that controls these by transmitting an operation signal to each lifting device An inclination detection device that detects the inclination postures of the front top beam and the rear top beam A first sighting target attached to either one of a pair of left and right front legs extending downward from the front top beam in the front portal frame A second sighting target attached to either one of a pair of left and right rear legs extending downward from the rear top beam in the rear portal frame A surveying instrument that measures the three-dimensional position coordinates of the first sighting target and the second sighting target And having The control unit executes a leveling process of automatically leveling the front top beam and the rear top beam by transmitting an operation signal to each lifting device based on the detection information of the inclination detection device. Further, after the leveling process, the first sighting target vertical required movement amount and the second sighting target vertical required movement amount in each of the front portal frame and the rear portal frame in the tunnel vertical direction calculated based on the measurement information of the surveying instrument are obtained, and an operation signal corresponding to the first sighting target vertical required movement amount is transmitted to the front left lifting device and the front right lifting device, and an operation signal corresponding to the second sighting target vertical required movement amount is transmitted to the rear left lifting device and the rear right lifting device to execute a centering top form height setting process for adjusting the height of the top form An automatic centering method

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