Segment assembly support system

Abstract

To improve the assembly accuracy of segment rings. [Solution] The segment assembly support system 60 includes a deformation amount measuring unit 70 that measures the amount of deformation of an already assembled segment ring 112 relative to its design value, and a display unit 80 that displays relevant information related to the deformation amount measured by the deformation amount measuring unit 70 on at least one of the inner circumferential surface of the existing segment ring 112 and the inner surface of the rear section 30 of the shield tunneling machine 100.

Description

Technical Field

[0001] The present invention relates to a segment assembly support system.

Background Art

[0002] Patent Document 1 discloses a circularity measuring device for measuring the circularity of a segment ring constructed inside an excavation resistance in a shield method.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, in the shield method, it is required to assemble the segment ring in a state close to the design value. To evaluate the assembly accuracy, it is important to grasp the circularity and the like indicating the state of the assembled segment ring by a device as described in Patent Document Ⅰ. However, even if the segment ring is assembled in a state close to the design value, it is difficult to assemble while predicting how the assembled segment ring will be affected by the pressure of the shield jack or the surrounding earth pressure, etc., and there is a limit to improving the assembly accuracy of the segment ring.

[0005] An object of the present invention is to improve the assembly accuracy of a segment ring.

Means for Solving the Problems

[0006] The present invention relates to a segment assembly support system that assists in the assembly of a segment ring constructed by connecting a plurality of segments along the circumferential direction of a tunnel excavated by a shield tunneling machine, comprising: a deformation amount measuring unit that measures the amount of deformation of an already assembled existing segment ring relative to its design value; and a display unit that displays relevant information related to the deformation amount measured by the deformation amount measuring unit on at least one of the inner circumferential surface of the existing segment ring and inside the body of the shield tunneling machine. [Effects of the Invention]

[0007] This can improve the assembly accuracy of segment rings. [Brief explanation of the drawing]

[0008] [Figure 1] A cross-sectional view showing the configuration of a shield tunneling machine to which a segment assembly support system according to an embodiment of the present invention is applied. [Figure 2] This is a diagram showing the segment ring constructed by a shield tunneling machine. [Figure 3] This is a block diagram showing the configuration of a segment assembly support system according to an embodiment of the present invention. [Figure 4] This diagram illustrates the measurement of deformation in existing segment rings. [Figure 5] This figure shows an example of how the degree of deformation of an existing segment ring is displayed by the display unit. [Figure 6] This is a flowchart illustrating the operation of a segment assembly support system according to an embodiment of the present invention. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings.

[0010] First, with reference to Figure 1, a shield tunneling machine 100 to which the segment assembly support system according to an embodiment of the present invention is applied will be described. The shield tunneling machine 100 excavates a borehole in the ground and constructs a shield tunnel T by assembling the segment rings 112, described later, to cover the inner wall of the borehole. Figure 1 is a cross-sectional view showing the configuration of the shield tunneling machine 100. In the following description, the face side, which is the direction in which the shield tunneling machine 100 moves, will be referred to as "front," and the opposite direction, the tunnel entrance side, will be referred to as "rear."

[0011] As shown in Figure 1, the shield tunneling machine 100 is a slurry pressure type shield tunneling machine used in the slurry pressure shield tunneling method, and has a cylindrical front section 10, a cylindrical rear section 30, and a bendable section 40 that connects the front section 10 and the rear section 30.

[0012] The front section 10 includes a cylindrical outer shell (skin plate) 11, a cutter head 20 positioned at the front end of the outer shell 11 and rotatably supported by the outer shell 11, and a partition wall 12 provided inside the outer shell 11 and spaced apart behind the cutter head 20.

[0013] A rotating drum 13 is supported on the partition wall 12 so as to be rotatable around a rotation axis C1. A cutter head 20 is connected to the rotating drum 13 via a connecting rod 13a. Therefore, the cutter head 20 can rotate together with the rotating drum 13 around the rotation axis C1. The rotation axis C1 is approximately coincident with the central axis of the outer shell 11.

[0014] The rotating drum 13 is connected to a motor 14 via a reduction mechanism (not shown) and is rotationally driven by the motor 14. When the motor 14 rotates the rotating drum 13 while the cutter head 20 is pressed against the ground, the cutter head 20 rotates and excavates the ground.

[0015] The cutter head 20 is a disc-shaped member having an outer diameter substantially equal to the outer diameter of the outer shell 11, and has a cutting surface 21 provided in the forward direction of the excavation direction and facing the face of the tunnel face, and an outer peripheral surface 22 formed at the outer edge of the cutting surface 21.

[0016] On the cutting surface 21, a plurality of cutter bits 21a protruding toward the face of the tunnel face are arranged radially around the rotation axis C1, and a plurality of openings (not shown) for guiding the earth and sand excavated by the cutter bits 21a into the chamber 15 are formed.

[0017] Between the cutter head 20 and the partition wall 12 behind the cutter head 20, the chamber 15 is defined by the cutter head 20, the partition wall 12, the outer shell 11, and the rotating drum 13. The excavated earth and sand generated by the excavation by the cutter head 20 stays in the chamber 15. The shield tunneling machine 100 further includes a screw conveyor 50 for carrying out the excavated earth and sand staying in the chamber 15 to the rear of the shield tunneling machine 100.

[0018] The screw conveyor 50 has a cylindrical case 51 and a auger 52 incorporated inside the case 51, and by rotating the auger 52 by a motor (not shown), the excavated earth and sand in the chamber 15 is carried out to the rear of the partition wall 12.

[0019] The rear body portion 30 has a cylindrical outer shell (skin plate) 31, an erector 33 for assembling the segment ring 112, a plurality of shield jacks 34 for advancing the shield tunneling machine 100, a backfill injection device 35 for injecting a grout material between the inner peripheral surface of the excavation pit 110 (pit) excavated by the cutter head 20 and the outer peripheral surface of the segment ring 112, a true circle holding device 37 for holding the shape of the segment ring 112, and a support portion 32 for supporting these devices provided in the rear body portion 30.

[0020] The erector 33 can grip the arc-shaped segment piece 113 and is configured to be movable along the inner peripheral surface of the outer shell 31 in the direction of the central axis C2 of the outer shell 31 and in the circumferential direction. By assembling a plurality of segment pieces 113 along the inner peripheral surface of the outer shell 31 by the erector 33, a cylindrical segment ring 112 is constructed.

[0021] As shown in FIG. 2, the segment ring 112 includes one K-type segment piece 113k disposed near the upper vertical side, a pair of B-type segment pieces 113b disposed so as to sandwich the K-type segment piece 113k, and a plurality of A-type segment pieces 113a disposed along the circumferential direction between the pair of B-type segment pieces 113b. Each segment piece 113 is connected to an adjacent segment piece 113 in the circumferential direction via a connecting portion not shown.

[0022] FIG. 2 is a developed view showing a plurality of segment rings 112 developed in the circumferential direction of the tunnel as viewed in the direction indicated by arrow A in FIG. 1, that is, toward the crown Ct. Note that the segment ring 114 indicated by the dashed line in FIGS. 1 and 2 is a newly installed segment ring 114 that is newly attached to the already assembled existing segment ring 112.

[0023] As shown in FIG. 2, the developed shape of the K-type segment piece 113k is an isosceles trapezoid shape having a longer length in the circumferential direction on the face side than on the shaft side, the developed shape of the A-type segment piece 113a is a rectangular shape having the same length in the circumferential direction on the shaft side and the face side, and the developed shape of the B-type segment piece 113b is a trapezoid shape with unequal legs that fills the space between the K-type segment piece 113k and the A-type segment piece 113a.

[0024] Furthermore, adjacent segment rings 112 in the axial direction are connected via connecting parts (not shown) so that the boundary lines between the segment pieces 113 formed when the segment pieces 113 are connected in the circumferential direction do not continue in the axial direction of the tunnel. For this reason, the K-type segment pieces 113k of each segment ring 112 are arranged, for example, in a staggered pattern along the top surface Ct.

[0025] Furthermore, the connecting portions that link adjacent segment pieces 113 in the circumferential direction are provided with tolerances in the radial and circumferential directions, known as "play," to improve ease of assembly. This "play" is also provided in the connecting portions that link adjacent segment rings 112 in the axial direction.

[0026] Multiple annular tail seals 31a are provided on the inner circumferential surface of the outer shell 31 at predetermined intervals in the axial direction to seal the gap between the outer shell 31 and the segment ring 112. The tail seals 31a are provided to prevent soil and water from entering the shield tunneling machine 100 through the gap between the outer shell 31 and the segment ring 112.

[0027] The backfill grouting device 35 is a device that injects grout material as backfill material into the gap that is created between the inner surface of the excavated hole 110 and the outer surface of the segment ring 112 after the shield tunneling machine 100 has passed through. The grout material is made of cement-based material and is injected into the gap through an injection passage (not shown) formed inside the outer shell 31, and through an injection port that opens on the rear end face of the outer shell 31. The injection passage and injection port may also be provided on the segment ring 112.

[0028] The circularity-holding device 37 is a device for preventing deformation of the circularly assembled segment ring 112 due to exposure to external pressure such as groundwater pressure, and has an expansion and contraction mechanism that can press and support the segment ring 112 from the inside. The circularity-holding device 37 is supported by a support frame 36 that extends rearward from the support portion 32 so as to be movable along the direction of the central axis C2 of the outer shell 31.

[0029] Multiple shield jacks 34 are arranged inside the front end of the outer shell 31 at predetermined intervals in the circumferential direction. Each shield jack 34 is a hydraulic jack consisting of a cylinder 34a and a rod 34b. The cylinder 34a is fixed to the outer shell 31, and a pressing portion 34c provided at the tip of the rod 34b protruding from the cylinder 34a contacts the side surface of the newly constructed segment ring 114 assembled inside the outer shell 31. Figure 1 shows the shield jacks 34 in a retracted state to secure space for assembling the newly constructed segment ring 114.

[0030] When the shield jack 34 is extended with the pressing part 34c in contact with the side of the newly installed segment ring 114, the cutter head 20 is pressed against the ground by the reaction force obtained from the newly installed segment ring 114 and the existing segment ring 112. In this way, the shield tunneling machine 100 uses the reaction force obtained by the shield jack 34 pressing against the segment rings 112 and 114 as the propulsion force for excavating forward.

[0031] The folding section 40 includes a front section connecting section 41 provided at the rear end of the front section 10, a rear section connecting section 42 provided at the front end of the rear section 30, and a plurality of folding jacks 43 provided between the front section 10 and the rear section 30.

[0032] The front body connection portion 41 is annular, and its inner circumferential surface is concave, forming part of a sphere whose center point lies on the central axis of the front body portion 10. The rear body connection portion 42 is annular, and its outer circumferential surface is convex, forming part of a sphere whose center point lies on the central axis of the rear body portion 30. The inner circumferential surface of the front body connection portion 41 is provided with a sealing portion that contacts the outer circumferential surface of the rear body connection portion 42 in order to prevent water or the like from entering the inside of the shield tunneling machine 100 through the gap between the front body connection portion 41 and the rear body connection portion 42.

[0033] Multiple folding jacks 43 are arranged at predetermined intervals in the circumferential direction so as not to interfere with the shield jacks 34. Each folding jack 43 is a hydraulic jack consisting of a cylinder 43a and a rod 43b. The rod 43b of the folding jack 43 is fixed to the front of the rear body 30 via a universal joint, and the cylinder 43a of the folding jack 43 is fixed to the rear of the front body 10 via a universal joint.

[0034] By appropriately extending and retracting the folding jack 43 connected to the front body 10 and the rear body 30 in this manner, the direction of the front body 10 relative to the rear body 30, that is, the direction of the rotation axis C1 relative to the central axis C2 direction of the rear body 30, can be bent in any direction.

[0035] The shield tunneling machine 100 with the above configuration rotates the cutter head 20, transports soil by the screw conveyor 50, and extends the shield jacks 34 to excavate the ground. A borehole 110 is excavated in the ground, and a shield tunnel T is constructed by sequentially assembling segment rings 112 and 114 along the inner surface of the borehole 110. Furthermore, grout material is injected into the gap between the inner surface of the borehole 110 and the outer surface of the segment ring 112 by a backfill injection device 35, and the segment ring 112 becomes firmly bonded to the ground via the grout material.

[0036] Furthermore, a number of trailing carriages 55 are positioned behind the shield tunneling machine 100 in the above configuration, moving in accordance with the excavation of the shield tunneling machine 100.

[0037] The trailing carriages 55 are configured to move on rails (not shown) laid on invert blocks 118 installed inside the shield tunnel T. These trailing carriages 55 are used as loading platforms for transporting segment pieces 113 and invert blocks 118, and as frames for power supply equipment that supplies power to the shield tunneling machine 100.

[0038] The leading trailing trolley 55 is connected to the rear section 30 of the shield tunneling machine 100 via a connecting member 54. Therefore, the multiple trailing trolleys 55 move within the shield tunnel T by being towed by the shield tunneling machine 100. Note that the trailing trolleys 55 may also have a self-propelled configuration.

[0039] As mentioned above, since a single segment ring 112 is composed of multiple segment pieces 113 divided in the circumferential direction, there is a risk that deformation may occur after assembly due to the pressing force of the shield jack 34 or the earth pressure of the ground acting on the outer surface. However, it is difficult to assemble the segment ring 112 while predicting how such deformation will occur.

[0040] For example, it is conceivable to continuously measure the deformation state of the existing segment ring 112 and transmit the measurement results to a monitor owned by the operator operating the erector 33. However, it is difficult for the operator to continuously check which of the multiple segment pieces 113 constituting the existing segment ring 112 is displaced and to what extent in the radially outward and radially inward directions, and to reflect this in the assembly of the new segment ring 114. Furthermore, interrupting the assembly work of the new segment ring 114 each time the deformation state of the existing segment ring 112 is checked may reduce the overall excavation work efficiency.

[0041] Therefore, in this embodiment, in order to smoothly inform the operator performing the installation work of the segment piece 113 of the relevant information related to the amount of deformation of the existing segment ring 112, a segment assembly support system 60 is adopted in the shield tunneling machine 100 with the above configuration, which displays the relevant information in a location visible to the operator.

[0042] As shown in Figure 3, the segment assembly support system 60 includes a deformation amount measuring unit 70 that measures the amount of deformation of the existing segment ring 112 relative to the design value, and a display unit 80 that can display relevant information related to the deformation amount measured by the deformation amount measuring unit 70 on the inner surface of the existing segment ring 112 and inside the rear section 30 of the shield tunneling machine 100. Figure 3 is a block diagram showing the configuration of the segment assembly support system 60.

[0043] The deformation amount measuring unit 70 includes a first distance sensor 71 capable of measuring the distance to the inner circumferential surface of the newly installed segment ring 114, a second distance sensor 72 and a third distance sensor 73 capable of measuring the distance to the inner circumferential surface of the existing segment ring 112, which is located behind the rear body 30 and is subjected to ambient earth pressure on its outer circumferential surface, and a deformation amount calculation unit 91 that calculates the deformation amount of the new segment ring 114 and the deformation amount of the existing segment ring 112 based on the distances measured by these distance sensors 71, 72, and 73 and the design value of the segment ring 112.

[0044] The first distance sensor 71 is a 2D-LiDAR (2D-Light Detection And Ranging) sensor that can measure the distance to a target by irradiating it with laser light.

[0045] As shown in Figure 1, the first distance sensors 71 are provided in groups of three to six at approximately equal intervals in the circumferential direction on the support frame 36, with the direction of laser beam irradiation facing the inner circumferential surface of the newly constructed segment ring 114 assembled within the rear body 30. By providing multiple first distance sensors 71 along the circumferential direction in this manner, it is possible to measure the distance to the inner circumferential surface of the newly constructed segment ring 114 over its entire circumference.

[0046] The newly installed segment ring 114, which is the target of measurement by the first distance sensor 71, becomes the existing segment ring 112 once its assembly within the rear body 30 is completed and it is pressed by the shield jack 34.

[0047] Therefore, the first distance sensor 71 can measure the distance to the inner surface of the newly installed segment ring 114 when the pressing load of the shield jack 34 is not acting on it, and can also measure the distance to the inner surface of the newly installed segment ring 114 when the pressing load of the shield jack 34 is acting on it, that is, the existing segment ring 112 located inside the rear body 30. Since the existing segment ring 112, whose distance to its inner surface is measured by the first distance sensor 71 is located inside the rear body 30, its outer surface is not subjected to surrounding earth pressure.

[0048] Therefore, the measurement value of the first distance sensor 71 when the newly installed segment ring 112 is the object of measurement will indicate the shape of the newly installed segment ring 112 when it is assembled. By comparing this measurement value with the design value (perfect circle) of the segment ring 112, it is possible to understand the deformation state during assembly, i.e., the assembly accuracy.

[0049] On the other hand, the measurement value of the first distance sensor 71 when the existing segment ring 112 is used as the measurement target will show the shape of the existing segment ring 112 when it is pressed by the shield jack 34, without earth pressure acting on its outer surface. By comparing this measurement value with the design value (perfect circle) of the segment ring 112, it is possible to understand the deformation state when pressed by the shield jack 34. In addition, in order to understand the effect of pressing by the shield jack 34, the measurement value of the first distance sensor 71 when the existing segment ring 112 is used as the measurement target may be compared with the measurement value of the first distance sensor 71 when the newly installed segment ring 112 is used as the measurement target.

[0050] Furthermore, as shown in Figure 1, the first distance sensor 71 can measure the distance to the inner surface of the outer shell 31 of the rear body 30 when the assembly of the new segment ring 114 has not yet begun. In other words, the first distance sensor 71 can measure two distances necessary to calculate the size of the tail clearance, which is the gap between the new segment ring 114 and the outer shell 31 of the rear body 30.

[0051] The second distance sensor 72 and the third distance sensor 73 are 2D-LiDAR sensors, similar to the first distance sensor 71.

[0052] As shown in Figure 1, the second distance sensors 72 are provided in groups of three to six at approximately equal intervals in the circumferential direction on the support frame 36, with the direction of laser beam irradiation directed toward the inner circumferential surface of the existing segment ring 112 located immediately behind the rear body 30. By providing multiple second distance sensors 72 along the circumferential direction in this manner, it is possible to measure the distance to the inner circumferential surface of the existing segment ring 112 over its entire circumference.

[0053] The segment ring 112, which is the target of measurement by the second distance sensor 72, is pushed backward from the rear section 30, and the surrounding earth pressure has begun to act on its outer surface via the grout material that has not yet hardened. Therefore, the measurement value of the second distance sensor 72 will show the shape of the existing segment ring 112 on which earth pressure has begun to act on its outer surface, and by comparing this measurement value with the design value (perfect circle) of the segment ring 112, it is possible to understand the deformation state when earth pressure acts on the outer surface. In addition, in order to understand the effect of earth pressure acting on the segment ring 112, the measurement value of the second distance sensor 72 may be compared with the measurement value of the first distance sensor 71 when the existing segment ring 112 on which earth pressure has not yet acted on its outer surface is the target of measurement.

[0054] As shown in Figure 1, the third distance sensors 73 are provided in groups of three to six at approximately equal intervals in the circumferential direction on the support frame 36, such that the direction of laser beam irradiation is directed toward the inner surface of an existing segment ring 112 that was assembled, for example, four or more segments before the segment ring 112 that the second distance sensor 72 is measuring. By providing multiple third distance sensors 73 along the circumferential direction in this way, it is possible to measure the distance to the inner surface of an existing segment ring 112 over its entire circumference.

[0055] The segment ring 112 measured by the third distance sensor 73 is in a state where the surrounding earth pressure is acting on its outer surface via a nearly hardened grout material. Therefore, the measurement value of the third distance sensor 73 indicates the shape of the existing segment ring 112 with the surrounding earth pressure acting steadily on its outer surface. By comparing this measurement value with the design value (perfect circle) of the segment ring 112, it is possible to understand the deformation state when the segment ring 112 is nearly fixed in place. To understand the effect of earth pressure acting on the segment ring 112, the measurement value of the third distance sensor 73 may be compared with the measurement value of the first distance sensor 71 when an existing segment ring 112 with no earth pressure acting on its outer surface is the target of measurement. Alternatively, to understand the effect of the hardening state of the grout material injected as backfill, the measurement value of the third distance sensor 73 may be compared with the measurement value of the second distance sensor 72.

[0056] The member to which these distance sensors 71, 72, and 73 are attached is not limited to the support frame 36, but may be a member other than the support frame 36 provided within the rear body 30. Furthermore, the distance sensors 71, 72, and 73 are not limited to range sensors such as 2D-LiDAR, but may be any type of distance sensor that can measure the distance to the inner circumferential surface of the segment ring 112, such as an ultrasonic distance sensor or a point-type laser distance sensor with relatively high measurement accuracy.

[0057] The measured values ​​obtained by the distance sensors 71, 72, and 73 are transmitted wirelessly or via wired connection to the deformation amount calculation unit 91.

[0058] The deformation amount calculation unit 91 is one of the functions of the control unit 90, which will be described later. It compares the measured values ​​measured by each distance sensor 71, 72, and 73 with the design value of the segment ring 112, calculates the difference as the deformation amount of the existing segment ring 112, and outputs correction guideline information to reduce the deformation amount of the newly installed segment ring 114 as related information related to the deformation amount. The measured values ​​measured by each distance sensor 71, 72, and 73 are pre-corrected to measured values ​​based on the central axis C2 (reference position) by adding the distance from the installation position of each distance sensor 71, 72, and 73 to the central axis C2 (reference position) of the rear body 30.

[0059] In the deformation calculation unit 91, as shown in Figure 4, the measured values ​​(solid lines in the figure) from each distance sensor 71, 72, and 73 are compared with the design value of the segment ring 112 (dashed circles in the figure). As an example, Figure 4 shows the measured value of the third distance sensor 73, which measures the distance to the inner surface of an existing segment ring 112 with surrounding earth pressure acting on its outer surface, among the measured values ​​of each distance sensor 71, 72, and 73.

[0060] For example, as shown in Figure 4, if the measurement value of the third distance sensor 73 is about 20 mm smaller than the design value in the vertical direction and about 20 mm larger than the design value in the horizontal direction, it is estimated that in order for the shape of the inner surface of the newly constructed segment ring 114 to be assembled to be close to the design value (perfect circle) when earth pressure acts on its outer surface, the newly constructed segment pieces allocated to the upper and lower sides should be installed so that they protrude about 10 mm radially outward, and the newly constructed segment pieces allocated to the left and right sides should be installed so that they are pulled in about 10 mm radially inward.

[0061] In this way, the deformation calculation unit 91 determines, based on the deformation direction of the existing segment ring 112 and the degree of deformation of the existing segment ring 112 relative to the design value, which it estimates is necessary to make the shape of the inner surface of the newly assembled segment ring 114, when it becomes the existing segment ring 112 with earth pressure acting on its outer surface, close to the design value (perfect circle). This information, specifically, determines which parts of the newly assembled segment ring 114 should be installed in an extended or retracted state and to what extent, for each newly assembled segment piece. This information is then output to the display control unit 92, described later, as related information (correction guideline information) for the newly assembled segment piece.

[0062] Thus, the correction guideline information is set for each new segment piece of the newly assembled segment ring 114, that is, for each allocation angle range of the new segment piece. For example, the correction guideline information for a predetermined new segment piece 114A shown in Figure 2 is set based on the difference between the measured value and the design value within the allocation angle range of the new segment piece 114A, as shown in Figure 4.

[0063] Specifically, the correction guideline information for a predetermined new segment piece 114A is as follows: if the measured value within the allocation angle range of the new segment piece 114A is greater than the design value, the information is to pull it inward radially by the difference between the measured value and the design value before installation; and if the measured value within the allocation angle range of the new segment piece 114A is smaller than the design value, the information is to extend it outward radially by the difference between the measured value and the design value before installation.

[0064] Furthermore, the correction guideline information for the predetermined new segment piece 114A may be obtained by comparing the average value of the measured values ​​within the allocation angle range of the new segment piece 114A with the design value. Alternatively, if there is a positive difference at one end of the allocation angle range of the new segment piece 114A and a negative difference at the other end, the information may be that the end with the measured value greater than the design value should be installed by pulling it inward radially by the difference between the measured value and the design value, and the end with the measured value smaller than the design value should be installed by extending it outward radially by the difference between the measured value and the design value.

[0065] The correction guideline information output from the deformation amount calculation unit 91 includes, as described above, correction guideline information estimated based on the measurement value of the third distance sensor 73, which is estimated based on the deformation amount of the existing segment ring 112 located behind the rear body 30 and subjected to surrounding earth pressure on its outer surface, as well as correction guideline information estimated based on the measurement value of the second distance sensor 72, which is estimated based on the deformation amount of the existing segment ring 112 located behind the rear body 30 and subjected to surrounding earth pressure on its outer surface, and correction guideline information estimated based on the measurement value of the first distance sensor 71, which is estimated based on the deformation amount of the existing segment ring 112 located inside the rear body 30 and pressed by the shield jack 34.

[0066] Furthermore, the correction guideline information includes information to be considered when assembling the newly installed segment ring 114, which is estimated based on the measurement value of the first distance sensor 71. This information includes information on tail clearance and tail end clearance estimated based on the distance from the first distance sensor 71 to the inner surface of the outer shell 31 of the rear body 30 and the distance to the inner circumferential surface of the newly installed segment ring 114 when the pressing load of the shield jack 34 is not acting, specifically information on the difference between the estimated tail clearance and tail end clearance and the reference value, and information on assembly accuracy estimated based on the distance from the first distance sensor 71 to the inner circumferential surface of the newly installed segment ring 112 and the design value (perfect circle) of the segment ring 112, specifically information on the difference between the measured value and the design value when the newly installed segment ring 112 is assembled. This information is also set for each newly installed segment piece of the newly installed segment ring 114 to be assembled, that is, for each allocation angle range of the newly installed segment piece.

[0067] In this way, the deformation amount calculation unit 91 calculates not only the deformation amount of the existing segment ring 112, but also the size of the tail clearance and tail end clearance, as well as the mounting error of the new segment piece when the new segment ring 112 is assembled.

[0068] The display unit 80 includes a projection device 81 capable of projecting characters or figures in a predetermined color onto the inner surface of an existing segment ring 112, a light-emitting device 82 capable of emitting light in a predetermined color, and a display control unit 92 that controls the content projected by the projection device 81 and the light-emitting color of the light-emitting device 82.

[0069] The projection device 81 is a light capable of projecting various light patterns by combining a high-brightness LED light source and a large optical element. As shown in Figure 1, twelve of these devices are provided on the support frame 36 at approximately equal intervals in the circumferential direction, preferably the same number as the new segment pieces that make up the new segment ring 114, so that the projection direction faces the inner circumferential surface of the existing segment ring 112.

[0070] The light-emitting devices 82 are high-brightness LED lights, and as shown in Figure 1, are provided on the outer surface of the cylinder 34a of the shield jack 34 in the same number as the shield jacks 34, with the direction of light emission facing approximately the center of the rear body 30. The light-emitting devices 82 only need to be installed in a position that is easily visible to the operator. For example, as shown by the dashed line in Figure 1, multiple devices may be installed at approximately equal intervals along the circumferential direction on the inner surface of the outer shell 31 of the rear body 30, or they may be installed in an annular shape along the support portion 32 of the rear body 30 or along a retaining ring (not shown) that holds multiple shield jacks 34.

[0071] The display control unit 92 is one of the functions of the control unit 90, which will be described later. Based on the correction guideline information (roundness correction information) calculated by the deformation amount calculation unit 91, it controls the projection content of the projection device 81 and the light emission state of the light emission device 82.

[0072] Specifically, as shown in Figure 5, the content of the correction guideline information is projected in color from the projection device 81 onto a projection area 115A set on the inner circumferential surface of the existing segment ring 112, corresponding to the mounting position of the new segment piece.

[0073] The projection area 115A is set for each new segment piece of the newly assembled segment ring 114. Specifically, the projection area 115A for a predetermined new segment piece 114A shown in Figure 2 is set as a related information display area within the same angular range as the allocation angular range of the new segment piece 114A, and extends across the inner circumferential surface of multiple existing segment rings 112, including the existing segment ring 112 assembled immediately before the newly assembled segment ring 114.

[0074] In this way, the projection area 115A of the newly installed segment piece 114A, which is set on the inner circumferential surface of the existing segment ring 112, is projected with the correction guideline information for the newly installed segment piece 114A calculated by the deformation amount calculation unit 91.

[0075] In the example of the correction guideline information shown in Figure 5(a), a displacement of 17 mm in the overhang direction is projected with an arrow and a numerical value. The arrow pointing towards the tunnel entrance, that is, the arrow indicating the direction away from the operator operating the erector 33, means that it is recommended to install the new segment piece, which is installed within the same angular range as the projection area where this arrow is displayed, in a radially overhanging position. The color of the arrow indicating the overhang direction is selected from a warm color gradient that gradually changes from red to white, for example. The larger the numerical value, i.e., the greater the overhang, the closer the color is to red, and the smaller the numerical value, i.e., the smaller the overhang, the closer the color is to white.

[0076] In the example of correction guideline information shown in Figure 5(b), the left connecting section is projected with arrows and numerical values ​​indicating that it should be displaced 11 mm in the overhang direction and the right connecting section should be displaced 4 mm in the retraction direction. The arrow pointing towards the tunnel face, that is, the arrow pointing towards the operator operating the erector 33, means that it is recommended to install the new segment piece, which is installed within the same angular range as the projection area where this arrow is displayed, in a radially retracted state. The color of the arrow indicating the retraction direction is selected from a cool color gradient that gradually changes from blue to white, for example. The larger the numerical value, i.e., the greater the retraction, the closer the color is to blue, and the smaller the numerical value, i.e., the smaller the retraction, the closer the color is to white.

[0077] Note that the projection examples shown in Figure 5 are just examples and are not limited to these. For example, the correction guideline information may be displayed using a combination of shapes other than arrows and numbers, or it may be displayed using only color, or some of the displayed content may be made to blink.

[0078] The emission state of the light-emitting device 82, that is, the emission color of the light-emitting device 82, is controlled in the same way as the projection from the projection device 81. For example, the emission color of a light-emitting device 82 installed within the same angular range as the projection area 115A is controlled to be a color that represents the correction guide information for the newly installed segment piece 114A.

[0079] The light-emitting color of the light-emitting device 82 is selected from a cool-toned gradient that gradually changes from blue to white when the correction guide information is retracted, with colors closer to blue being selected for greater retraction and colors closer to white being selected for smaller retraction. On the other hand, when the correction guide information is protruding, the light-emitting color is selected from a warm-toned gradient that gradually changes from red to white, with colors closer to red being selected for greater protrusion and colors closer to white being selected for smaller protrusion.

[0080] Furthermore, as mentioned above, the correction guideline information for the designated new segment piece 114A includes multiple pieces of information; therefore, the information indicated by the content projected from the projection device 81 and the information indicated by the light emitted by the light-emitting device 82 may be different pieces of information.

[0081] For example, the light-emitting color of the light-emitting device 82 may indicate information regarding the tail clearance and tail end clearance as described above. In this case, the light-emitting color is selected from a warm-toned gradient that gradually changes from red. When the clearance is significantly smaller or significantly larger than the standard value, a color closer to red is selected, while when the clearance is within the standard value, green or white is selected. Alternatively, the light-emitting color of the light-emitting device 82 may indicate information regarding the assembly accuracy of the newly installed segment ring 112.

[0082] The control unit 90, which has the above-mentioned deformation amount calculation unit 91 and display control unit 92 as its functions, is specifically composed of a microcomputer equipped with a CPU (Central Processing Unit), ROM (Read-Only Memory), RAM (Random Access Memory), and an I / O interface (Input / Output Interface). The RAM stores data from the CPU's processing, the ROM stores the CPU's control program and the like in advance, and the I / O interface is used for inputting and outputting information with devices and sensors connected to the control unit 90. The control unit 90 may be composed of multiple microcomputers.

[0083] The deformation calculation unit 91 and the display control unit 92 represent the functions of the control unit 90 as virtual units and do not imply their physical existence. Furthermore, the control unit 90 may also function as a controller for controlling the drives of various parts of the shield tunneling machine 100.

[0084] Next, the operation of the segment assembly support system 60 with the above configuration will be explained with reference to the flowchart shown in Figure 6.

[0085] First, in step S11, it is determined whether or not the excavation process of the shield tunneling machine 100 has been completed. If completion of the excavation process is detected, the process proceeds to step S12.

[0086] Whether or not the excavation process of the shield tunneling machine 100 is completed is determined, for example, by whether or not the extension amount of the shield jack 34 reaches a predetermined amount and the drive of the shield jack 34 stops.

[0087] Once the tunneling process of the shield tunneling machine 100 is completed, in step S12, distance measurement is performed by the second distance sensor 72 and the third distance sensor 73.

[0088] Specifically, the second distance sensor 72 measures the distance to the inner surface of an existing segment ring 112 located immediately behind the rear section 30, where the surrounding earth pressure acts on the outer surface via grout material that has not yet hardened. The third distance sensor 73 measures the distance to the inner surface of an existing segment ring 112 that was assembled about four segments before the segment ring 112 measured by the second distance sensor 72, where the surrounding earth pressure acts on the outer surface via grout material that has almost hardened.

[0089] The measured values ​​obtained by the second distance sensor 72 and the third distance sensor 73 are transmitted to the deformation amount calculation unit 91, where the deformation amount of the existing segment ring 112 is calculated as described above.

[0090] In the following step S13, the distance to the inner surface of the outer shell 31 of the rear body 30 is measured by the first distance sensor 71.

[0091] The measurement by the first distance sensor 71 in step S13 is performed when the shield jack 34 has retracted and, as shown in Figure 1, the new segment ring 114 can be assembled to the existing segment ring 112 in the space between the existing segment ring 112 and the pressing portion 34c of the shield jack 34, that is, when there are virtually no obstacles between the first distance sensor 71 and the outer shell 31 of the rear body 30.

[0092] The distance to the inner surface of the outer shell 31 of the rear body 30, as measured by the first distance sensor 71, is transmitted to the deformation amount calculation unit 91 and used to calculate the tail clearance and tail end clearance.

[0093] Step S12 may be performed simultaneously with step S13.

[0094] When the distance to the inner surface of the outer shell 31 of the rear section 30 is measured by the first distance sensor 71, in the following step S14, the above-mentioned correction guideline information calculated by the deformation amount calculation unit 91 of the deformation amount measurement unit 70 is displayed by the display unit 80 on the inner surface of the existing segment ring 112 and the inner surface of the rear section 30 of the shield tunneling machine 100.

[0095] The operator or other personnel will pre-select which of the above-mentioned correction guideline information will be displayed on the inner surface of the existing segment ring 112 and on the inner surface of the rear section 30 of the shield tunneling machine 100.

[0096] The specific information to be displayed is selected based on the conditions under which suppressing deformation of the existing segment rings 112 should be prioritized. For example, if the priority is to suppress the deformation of existing segment rings 112 in a state where the surrounding earth pressure is steadily acting on the outer surface via nearly hardened grout material, that is, the deformation of segment rings 112 that constitute a nearly completed shield tunnel T, then correction guideline information set for each allocation angle range of the new segment pieces of the new segment rings 114 to be assembled will be displayed based on the measurement values ​​of the third distance sensor 73.

[0097] Furthermore, if it is prioritized to suppress the deformation of the existing segment ring 112, which is already being subjected to surrounding earth pressure through the grout material that has not yet hardened, that is, the deformation of the segment ring 112 caused by the earth pressure, then correction guideline information set for each allocation angle range of the new segment piece will be displayed based on the measurement value of the second distance sensor 72.

[0098] Furthermore, if it is prioritized to suppress the deformation of the existing segment ring 112, which is not subjected to earth pressure on its outer surface but is being pressed by the shield jack 34, that is, the deformation of the segment ring 112 caused by the pressing force of the shield jack 34, then correction guideline information set for each allocation angle range of the new segment piece is displayed based on the measurement value of the first distance sensor 71.

[0099] Furthermore, if it is a priority to suppress the deformation of the newly installed segment ring 114 immediately after assembly, that is, the deformation of the newly installed segment ring 114 due to assembly errors, based on the measurement value of the first distance sensor 71, information regarding the deformation of the newly installed segment ring 114 set for each allocation angle range of the newly installed segment piece is displayed as correction guideline information.

[0100] Furthermore, if it is prioritized that the tail clearance and tail end clearance be within the standard values, information regarding the tail clearance and tail end clearance set for each allocation angle range of the newly installed segment piece based on the measurement value of the first distance sensor 71 will be displayed as correction guideline information.

[0101] As described above, the correction guideline information set for each of these newly installed segment pieces is projected by the projection device 81 onto the inner surface of the existing segment ring 112 in a projection area set within the same angular range as the allocation angular range of the new segment piece, and is also shown by the light-emitting device 82 installed on the inner surface of the rear body 30 within the same angular range as the allocation angular range of the new segment piece. In other words, the correction guideline information is displayed on both the front and rear sides of the new segment ring 114 that is to be assembled, in a location that is easily visible to the operator who will assemble the new segment ring 114 using the erector 33.

[0102] Furthermore, the information displayed on the inner surface of the existing segment ring 112 and the information displayed on the inner surface of the rear section 30 of the shield tunneling machine 100 do not need to be the same; they may be different. For example, the inner surface of the existing segment ring 112 may display correction guideline information set based on the measurement values ​​of the second distance sensor 72 or the third distance sensor 73, while the inner surface of the rear section 30 of the shield tunneling machine 100 may display information regarding tail clearance and tail end clearance, as well as information regarding the deformation amount of the newly installed segment ring 114, which are set based on the measurement values ​​of the first distance sensor 71.

[0103] Furthermore, the correction guideline information may be automatically selected. For example, the correction guideline information calculated based on the measurement values ​​of distance sensors 71, 72, and 73, which measured the measurement value that showed the largest deformation amount of the existing segment ring 112, may be automatically displayed.

[0104] With the correction guideline information displayed on the inner surface of the existing segment ring 112 and the inner surface of the rear section 30 of the shield tunneling machine 100, the assembly of the new segment ring 114 is performed by an operator operating the erector 33 (step S15).

[0105] The operator operates the erector 33 while checking the correction guideline information displayed on the front and rear sides of the space between the existing segment ring 112, where the new segment ring 114 will be assembled, and the pressing portion 34c of the shield jack 34, and then assembles the new segment piece.

[0106] Since the correction guideline information is displayed in the direction of the central axis C2, adjacent to the allocation angle range where the new segment piece is installed, the operator can understand to what extent it is recommended to install the new segment piece in an extended or retracted position without taking their eyes off the new segment piece during installation.

[0107] Once the assembly of the newly constructed segment ring 114 is complete, the process proceeds to step S16, where the first distance sensor 71 measures the distance to the inner surface of the assembled newly constructed segment ring 114.

[0108] The distance to the inner surface of the newly installed segment ring 114, measured by the first distance sensor 71, is transmitted to the deformation amount calculation unit 91 and used in calculating the tail clearance and tail end clearance, as well as the deformation amount of the existing segment ring 112.

[0109] When the distance to the inner surface of the newly installed segment ring 114 is measured by the first distance sensor 71, the excavation process of the shield tunneling machine 100 is started in the following step S17.

[0110] When the pressing portion 34c of the shield jack 34 comes into contact with the side surface of the newly installed segment ring 114, the shield jack 34 extends and the excavation process of the shield tunneling machine 100 begins. At this point, the first distance sensor 71 measures the distance to the newly installed segment ring 114 under the pressure of the shield jack 34, that is, to the inner surface of the existing segment ring 112 located inside the rear section 30 (step S18).

[0111] The measured values ​​obtained by the first distance sensor 71 are transmitted to the deformation amount calculation unit 91, where the deformation amount of the existing segment ring 112 is calculated as described above.

[0112] In the following step S19, it is determined whether or not the newly constructed segment ring 114, which will be assembled next, is present.

[0113] If there is no new segment ring 114 to be assembled next, there is no need to display correction guideline information, etc., and the operation of the segment assembly support system 60 will be terminated.

[0114] On the other hand, if there is a new segment ring 114 to be assembled next, the process returns to step S11 to display correction guideline information, etc., and each of the above steps is repeated.

[0115] The segment assembly support system 60 operates through the above process in order to display correction guideline information, etc.

[0116] According to the above-described embodiment, the following effects are achieved.

[0117] In this embodiment, the segment assembly support system 60 applied to the shield tunneling machine 100 displays correction guideline information on the inner circumferential surface of the existing segment ring 112, or on the inner surface of the rear section 30 of the shield tunneling machine 100, as information related to the amount of deformation of the existing segment ring 112.

[0118] In this way, by displaying information related to the deformation amount of the existing segment ring 112, particularly correction guideline information indicating how much it is recommended that each part of the new segment piece of the new segment ring 114 be installed in an overhanging or retracted state, in a location easily visible to the operator while they are working on installing the new segment ring 114, it becomes possible to assemble the new segment ring 114 so that the shape of the inner surface when the new segment ring 114 becomes the existing segment ring 112 with earth pressure acting on its outer surface is close to the design value (perfect circle), without relying on the operator's experience.

[0119] This improves the assembly accuracy of the segment ring 112.

[0120] Furthermore, in this embodiment, the projection area 115A on which the correction guideline information is displayed is set on the inner surface of the existing segment ring 112 as a related information display area within the same angular range as the allocation angular range of the new segment piece 114A of the newly assembled segment ring 114.

[0121] By displaying the correction guideline information for the new segment piece 114A at the location where the new segment piece 114A is to be installed, the operator can perform the installation work of the new segment piece 114A while checking the correction guideline information.

[0122] This improves the efficiency of the assembly process for the segment ring 112.

[0123] Next, modifications of this embodiment will be described. Note that the following modifications are also within the scope of the present invention, and it is possible to combine the configurations shown in the modifications with the configurations described in the above-described embodiments, or to combine the configurations described in the following different modifications.

[0124] In the above embodiment, the display unit 80 displays correction guideline information as information related to the amount of deformation. Alternatively, the display unit 80 may simply display the difference between the measured value calculated by the deformation amount measurement unit 70 and the design value as information related to the amount of deformation. However, since it is difficult to immediately determine which part of the new segment piece of the new segment ring 114 should be installed in an extended or retracted state and to what extent if only the current state is shown, it is preferable that correction guideline information is displayed as information related to the amount of deformation, as in the above embodiment.

[0125] Furthermore, in the above embodiment, distance sensors 71, 72, and 73 are provided at three locations in the direction of the central axis C2 in order to measure the amount of deformation of the existing segment ring 112. The distance sensors may be installed at only one or two of the three locations mentioned above, or at more than three locations. For example, a distance sensor may be added behind the third distance sensor 73 to measure the distance to the inner surface of the existing segment ring 112, where the surrounding earth pressure is constantly acting on the outer surface.

[0126] Furthermore, in the above embodiment, the shield tunneling machine 100 is a so-called earth pressure balance type shield tunneling machine. Alternatively, the shield tunneling machine 100 may be a so-called slurry pressure type shield tunneling machine equipped with a supply and discharge device that supplies and discharges slurry into the chamber 15 to transport the excavated soil accumulated in the chamber 15 to the rear of the shield tunneling machine 100.

[0127] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. [Explanation of Symbols]

[0128] 100... Shield tunneling machine 30...Rear torso (torso) 33.. Erecta 34. Shield Jack 36... Support Frame 60-segment assembly support system 70. Deformation measurement unit 71...First distance sensor 72...Second distance sensor 73. Third distance sensor 80...Display section 81...projection device 82...Light-emitting device 90... Control Unit 91. Deformation Amount Calculation Unit 92...Display Control Unit 110...Drilling shaft (shaft) 112...Segment ring (existing segment ring) 113... Segment Piece 114... Newly established segment ring 114A... Newly installed segment piece 115A...Projection Area C1... Rotation axis C2...Central axis T-shield tunnel

Claims

1. A segment assembly support system that assists in the assembly of a segment ring constructed by connecting multiple segments along the circumferential direction of a tunnel excavated by a shield tunneling machine, A deformation measurement unit measures the amount of deformation relative to the design value of an already assembled existing segment ring, The system includes a display unit that displays relevant information related to the deformation amount measured by the deformation amount measuring unit on at least one of the inner circumferential surface of the existing segment ring and inside the body of the shield tunneling machine. Segment assembly support system.

2. The deformation amount measuring unit obtains the relevant information of the new segment piece based on the deformation amount of the existing segment ring in the same angular range as the allocation angular range of the newly installed segment piece to be attached. The display unit displays the relevant information of the newly installed segment piece on at least one of the following: within the same angular range as the allocation angular range on the inner circumferential surface of the existing segment ring, and within the same angular range as the allocation angular range on the body of the shield tunneling machine. The segment assembly support system according to claim 1.

3. The related information displayed by the display unit includes: Information relating to the amount of deformation of the existing segment ring, which is located behind the body of the shield tunneling machine and on which the surrounding earth pressure acts on its outer surface, This includes at least one of the following: information relating to the amount of deformation of the existing segment ring located inside the body of the shield tunneling machine and pressed by the shield jack; A segment assembly support system according to claim 1 or 2.

4. The related information displayed by the display unit includes correction guideline information set according to the deformation direction of the existing segment ring and the degree of deformation of the existing segment ring relative to the design value. A segment assembly support system according to claim 1 or 2.

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