Spray nozzle device equipped with distance measuring device

Abstract

To prevent rebounded shotcrete from accumulating on a distance measuring device and making measurement impossible in a spraying nozzle device equipped with the distance measuring device for measuring the distance to a wall surface of a tunnel.SOLUTION: A spraying nozzle device 5 includes a mount 7 for a distance measuring instrument 6 at a base end of a spraying nozzle 27. The mount 7 is composed of a frame-shaped member 8, and has an annular header 9 in a shape of a ring hollow tube on the outer circumference of the frame-shaped member 8. A distance measuring device installation plate 10 is installed on the upper surface of the frame-shaped member 8. The distance measuring device 6 is fixed to the distance measuring device installation plate 10. A branch pipe 11 rising from the annular header 9 is provided at the position where each distance measuring device 6 is arranged. A cleaning nozzle 12 for injecting a cleaning agent toward the distance measuring device 6 is provided in the branch pipe 11. A space for the rebound shotcrete to drop is formed around each distance measuring device 6.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a spray nozzle device equipped with a distance measuring device for measuring the distance to the spray surface when spraying in a mountain tunnel. [Background technology]

[0002] For example, in the construction of mountain tunnels, the mainstream method is the NATM method, which uses rock bolts inserted into the ground and shotcrete applied along the excavation wall as the main support materials.Excavation methods can be broadly divided into blasting methods, which use explosives to excavate, TBM methods, which use a full-face excavator called a TBM, and mechanical excavation methods, which use a free-face excavator with a cutter boom.

[0003] Conventionally, the above-mentioned sprayed concrete work has mainly been carried out using a spraying machine, as shown in Figure 10, which has a boom 61 that holds a spray nozzle attached to a movable carriage 60, such as a crawler type, tire type, or rail type, and which operates the spray nozzle 62 by manipulating this boom.

[0004] The spraying work is carried out by workers such as a nozzle man who controls the nozzle, a spraying machine operator who operates the spraying machine, and a ready-mixed concrete driver who supplies the sprayed concrete to the spraying machine, with the spraying machine installed near the face.However, this is difficult work in a narrow space, and even if ventilation equipment is installed, the workers are forced to work in a poor environment where they are exposed to relatively high concentrations of dust.

[0005] Therefore, in recent years, attempts have been made to automate tunnel spraying work, that is, to make spraying work unmanned or automated by remote control.

[0006] For example, Patent Document 1 listed below discloses a remote control system for spraying work in underground excavation, in which a spraying work site is equipped with an optical distance meter for measuring the shape of the inner wall surface of the spraying work area, a remotely controlled spraying robot, and a camera for monitoring the measurement work using the optical distance meter and the spraying work by the spraying robot, and a remote control site is equipped with a computer for data processing of the measurement signals measured by the optical distance meter and displaying them on a monitor, a remote control operator for the spraying robot for remotely controlling the spraying robot, and a monitor device for displaying images captured by the camera, and in which various signals between the group of devices installed at the spraying work site and the group of devices installed at the remote control site are connected so that they can be transmitted over the air by radio waves or via wired signal cables.

[0007] In Patent Document 2 below, the present inventors also performed spraying on the tunnel excavation wall surface by the NATM construction method using a spraying machine that holds a spray nozzle at the tip of a multi-joint boom that can be controlled to move along the tunnel wall surface at an arbitrary distance from the excavation wall surface, A distance measuring device is placed to measure the distance to the tunnel wall. During the process of moving the spray nozzle along the tunnel wall surface to spray, the moving speed of the spray nozzle is measured, and the distance measuring device is used to measure the distance before and after the spraying to measure the spray thickness resulting from the spraying, and a proportional relationship between the moving speed of the spray nozzle and the spray thickness is obtained, Under conditions where there are uneven sections on the tunnel excavation wall surface, we have proposed a tunnel spraying control method in which, in the initial stage of spraying, the spray nozzle is moved while keeping the pressure-fed amount of spray material constant, and based on the proportional relationship equation, the movement speed is relatively slower in concave sections and faster in convex sections, thereby correcting the sprayed surface to be smooth. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-120394 [Patent Document 2] Japanese Patent Application Publication No. 2019-167678 Summary of the Invention [Problem to be solved by the invention]

[0009] In the above-mentioned Patent Documents 1 and 2, a distance measuring device that measures the distance to the wall surface is placed in the spray nozzle. The inventors prototyped a mounting base for the distance measuring device and actually sprayed concrete, and found that when spraying concrete upward, in particular, the rebound of the sprayed concrete adheres to the distance measuring device and gradually accumulates, causing a situation where measurement cannot be continued due to the accumulated shotcrete.

[0010] Therefore, the main objective of the present invention is to prevent rebound sprayed concrete from accumulating on a distance measuring device that measures the distance to a tunnel wall, making it impossible to measure, in a spray nozzle device equipped with the distance measuring device. [Means for solving the problem]

[0011] In order to solve the above problem, the present invention according to claim 1 provides a spray nozzle device equipped with a distance measuring device for measuring the distance to a tunnel wall, A mounting base for a distance measuring device is provided at the base end of the spray nozzle, The mounting base is formed by a frame-shaped member, and has a ring-shaped hollow tube-shaped annular header on the outer periphery of the frame-shaped member, and is formed by installing a distance measuring instrument installation plate on the upper surface of the frame-shaped member, and distance measuring instruments are fixed to the distance measuring instrument installation plate, and branch pipes are provided that rise from the annular header at the locations where each distance measuring instrument is installed, and cleaning nozzles are provided on the branch pipes to spray cleaning agent toward the distance measuring instruments, A spray nozzle device equipped with a distance measuring device is provided, characterized in that a space is formed around each distance measuring device for rebound shotcrete to fall.

[0012] In the invention described in claim 1 above, the mounting base for installing the distance measuring device is formed by a frame-shaped member, and has a hollow-tube-shaped annular header on the outer periphery of the frame-shaped member, and a distance measuring device installation plate is installed on the upper surface of the frame-shaped member.The distance measuring devices are fixed to the distance measuring device installation plate, and branch pipes rising from the annular header are provided at the locations where each distance measuring device is installed, and cleaning nozzles for spraying cleaning agent toward the distance measuring device are provided on these branch pipes, and a space is formed around each distance measuring device for rebound shotcrete to fall.

[0013] Therefore, the rebounded shotcrete can be prevented from gradually accumulating because it passes through the space and falls. Cleaning The cleaning agent is sprayed continuously or intermittently from the nozzle to wash away the sprayed concrete adhering to the distance measuring device, making it possible to continuously maintain the function of the distance measuring device.

[0014] As a second aspect of the present invention, there is provided a spray nozzle device equipped with a distance measuring device for measuring the distance to a tunnel wall, A mounting base for a distance measuring device is provided at the base end of the spray nozzle, the mounting base being fitted around the spray nozzle, The mounting base is composed of a frame-like member consisting of a closed-shaped frame material and arm members extending outward from the outer surface of the frame material at the locations where the distance measuring devices are arranged, ring-shaped hollow tubular annular headers supported at the tips of the arm members, and distance measuring device installation plates installed on the upper surface of the frame material and arm members at the locations where the distance measuring devices are arranged, straddling the frame material and arm members, a distance measuring instrument is fixed to the upper surface of each distance measuring instrument installation plate, a branch pipe is provided that stands up from the annular header at the location where each distance measuring instrument is installed, and a cleaning nozzle is provided on the branch pipe to spray a cleaning agent toward the distance measuring instrument from a relatively upper position; A spray nozzle device equipped with a distance measuring device is provided, characterized in that a space is formed around each distance measuring device for rebound shotcrete to fall.

[0015] The invention described in claim 2 above proposes a more specific structure of the spray nozzle device. This device also prevents rebound shotcrete from gradually accumulating because it passes through the space and falls. Cleaning The cleaning agent is sprayed continuously or intermittently from the nozzle to wash away the sprayed concrete adhering to the distance measuring device, making it possible to continuously maintain the function of the distance measuring device.

[0016] As the present invention related to claim 3, there is provided a spray nozzle device equipped with a distance measuring device according to either claim 1 or 2, wherein the distance measuring device is respectively arranged at a position in front of the spray nozzle in the direction of movement and at a position in back of the direction of movement.

[0017] In the invention described in claim 3, the distance measuring devices are arranged at positions ahead of and behind the movement direction of the spray nozzle, assuming that the spray nozzle is moved in the circumferential direction of the tunnel. These distance measuring devices make it possible to measure the spray thickness resulting from the spraying.

[0018] The present invention of claim 4 provides a spray nozzle device equipped with a distance measuring device as described in either claim 1 or 2, wherein the distance measuring device is arranged in at least four locations, including positions in front and behind the spray nozzle in the tunnel circumferential direction and positions in front and behind the spray nozzle in the tunnel direction.

[0019] In the invention described in claim 4 above, in order to accommodate any movement direction of the spray nozzle, distance measuring devices are installed in at least four locations, including positions in front and behind the spray nozzle in the tunnel circumferential direction, and positions in front and behind the spray nozzle in the tunnel direction.

[0020] The present invention according to claim 5 provides a spray nozzle device equipped with the distance measuring device according to any one of claims 1 to 4, wherein the cleaning agent is air, water, or a concrete remover, or a combination thereof.

[0021] The invention described in claim 5 above specifies a specific example of a cleaning agent. Specifically, the cleaning agent can be any one of air, water, and a concrete stripping agent, or a combination thereof.

[0022] According to a sixth aspect of the present invention, there is provided a spray nozzle device equipped with a distance measuring device according to any one of the first to fifth aspects, in which a radar range finder is used as the distance measuring device.

[0023] In the invention described in claim 6 above, any distance meter can be used as the distance measuring instrument, such as an optical distance meter, laser distance meter, ultrasonic distance meter, or radar distance meter. However, since optical distance meter and laser distance meter are prone to producing noise due to dust and rebound, making them incapable of measurement, it is preferable to use a radar distance meter that uses short-wavelength microwaves or millimeter waves and is resistant to noise from environmental factors, etc.

[0024] As the present invention according to claim 7, Cleaning There is provided a spray nozzle device equipped with a distance measuring device according to any one of claims 1 to 6, wherein a nozzle having a horizontal slit-shaped jet port is used as the nozzle.

[0025] In the invention described in claim 7, Cleaning The nozzle has a horizontal slit-shaped nozzle. CleaningNozzles cannot efficiently remove the adhering shotcrete, but if the nozzle is made into a horizontal slit to ensure the projection width, it becomes possible to effectively remove the adhering shotcrete. [Effects of the Invention]

[0026] As described above, according to the present invention, in a spray nozzle device equipped with a distance measuring device that measures the distance to a tunnel wall, it is possible to prevent rebound sprayed concrete from accumulating on the distance measuring device, making it impossible to measure. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a side view of the spray machine 1. [Figure 2] FIG. 1 is a plan view of the spray machine 1. [Figure 3] 1A and 1B show a spraying device 2, in which (A) is a plan view and (B) is a side view. [Figure 4] 1A and 1B show a spray nozzle device 5, in which (A) is a plan view and (B) is a side view. [Figure 5] 1A and 1B show a frame-shaped member 8, in which (A) is a plan view and (B) is a side view. [Figure 6] 1A shows an annular header 9, in which (A) is a plan view, (B) is a view taken along line BB in (A), and (C) is a view taken along line CC in (A). [Figure 7] FIG. 2 is a plan view of the distance measuring instrument installation plate 10. [Figure 8] 10 is a diagram showing an assembly procedure for a frame-shaped member 8, an annular header 9, and a distance measuring instrument installation plate 10. FIG. [Figure 9] 1A and 1B show the assembled state of a frame-shaped member 8, an annular header 9, and a distance measuring instrument installation plate 10, in which (A) is a plan view and (B) is a view taken along the line BB in (A). [Figure 10] FIG. 2 is a side view showing the spraying procedure using the spraying machine 60. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0029] [About spray machine 1] Mountain tunnels are excavated by positioning heavy tunnel construction machinery such as jumbo drills, gunning machines, and wheel loaders near the tunnel face, and using the mini-bench method, which involves working on the upper and lower halves in parallel, drilling rock bolt holes and loading charge holes and charges in each half, then blasting both halves at once to remove them, and then excavating in one cycle in the following order: shear removal → hit detection → primary gunning → erection of steel supports → secondary gunning → rock bolt installation.A center is also positioned behind the tunnel face, where the concrete lining is constructed and the invert is installed.

[0030] As shown in FIGS. 1 and 2, the spraying machine 1 is self-propelled by a crawler 51 driven by a power source. Possible This is a heavy machine for tunnel work (hereinafter also referred to as a spraying machine with erector device) that is equipped with a spraying device 2, an erector device 3, and a basket device 4 on a bogie body 50. This spraying machine 1 is used for primary spraying work, erection work of steel shoring, and secondary spraying work.

[0031] As shown in detail in Fig. 3, the spraying device 2 is provided at a position in the center of the front of the carriage body 50. A first arm 21 is pivotally supported on a base 20 on the carriage body 50 side so as to be swingable about a horizontal shaft 20a, and is adapted to swing in the elevation direction by expansion and contraction of a hydraulic cylinder 21A. The base end 20A of the first arm 21 is supported as a whole so as to be swingable about a vertical shaft 20b, and is adapted to swing horizontally by swivel hydraulic cylinders 21B and 21C arranged on the side.

[0032] A second arm 22 is housed inside the first arm 21 and is made extendable and retractable by a first telescopic hydraulic cylinder 24, and a third arm 23 is housed inside the second arm 22 and is made extendable and retractable by a second telescopic hydraulic cylinder 25. In addition, cover materials 27 that can expand and contract in conjunction with the extension and retraction of the arms are provided around the first arm, second arm 22 and third arm 23 to prevent rebound shotcrete from adhering to the arms and making them unable to extend and retract.

[0033] A spray nozzle device 5 is supported at the tip of the third arm 23. The spray nozzle device 5 can swing horizontally and vertically within a predetermined angular range using a built-in horizontal rotation motor and vertical movement motor, and is capable of spraying the spray material onto the tunnel wall surface from the spray nozzle 27 it holds. This spray nozzle device 5 will be described in more detail below.

[0034] The basket device 4 is a facility for workers to ride on, and as shown in Figure 2, two basket devices 4A, 4B are provided in a pair on the left and right sides of the center at the front of the carriage body 50. A telescopic boom 41, which is extendable and retractable by a telescopic mechanism, is provided with a base 40 on the carriage body 50 as its base end, and a lift deck 42 is supported at the tip of the telescopic boom 41. As shown in Figure 1, the telescopic boom 41 can be raised and lowered in the vertical direction with the base end as a fulcrum by hydraulic cylinders 41A, 41B, and can also swing left and right by hydraulic cylinders (not shown). The lift deck 42 is connected via a connector 43 and is supported by a hydraulic cylinder 44 so that it can swing up and down.

[0035] The erector assemblies 3 are equipment for erecting steel shoring in a predetermined position, and as shown in Figures 1 and 2, two are installed in a pair on the left and right sides of the center at the front of the bogie body 50. Most of the steel shoring is connected at the top end to form a single arch member, and the erector assemblies 3A located on the right lift the separate steel shoring on the right side facing the face and set it in the predetermined position, while the erector assemblies 3B located on the left side lift the separate steel shoring on the left side and set it in the predetermined position. For connection work at the top end, workers get into the bucket assemblies 4 and perform bolt connection work close to the connection parts.

[0036] 1 and 2, the spraying work using the spraying machine 1 is performed by positioning the spraying machine 1 at the spraying location near the tunnel face, and then measuring the position coordinates and posture of the spraying machine 1 through surveying. Coordinate data such as tunnel shape coordinate data and measured spray shape line data are all input to the controller, and in order to manage the measurement of the position coordinates of the spraying nozzle 27 and the coordinates for controlling the movement of the spraying nozzle 27, it is first necessary to understand the coordinate state of the spraying machine 1.

[0037] Specifically, a total station for measurement is installed inside the tunnel, and at least two reference points (not shown) are also installed inside the tunnel beforehand. The total station is used to collimate the two reference points, and based on the distance and angle measurement data, the installation coordinates of the total station are determined by resection. The position coordinates of the total station are also determined at appropriate time intervals to check for any positional deviation.

[0038] In addition, at least two collimation targets are installed at the rear of the spray machine 1. These two collimation targets are installed horizontally spaced apart and at different heights in the vertical direction, and by collimating these collimation targets with the total station, it is possible to determine the installation coordinates of the spray machine 1 as well as the attitude (roll angle, pitch angle, yaw angle) of the spray machine 1. Note that the position and attitude of the spray machine 1 may be determined by installing one collimation target at the rear of the spray machine 1 and attaching a three-axis angle sensor to the machine body, so that the coordinates are obtained using the collimation target and the attitude is determined using the three-axis angle sensor.

[0039] In controlling the movement of the spray nozzle 27, for example, multiple motion cameras can be installed on the front side of the spray machine 1, and a collimation target (LED marker) can be installed on the spray nozzle 27. The coordinates of the collimation target can be continuously measured by the motion cameras to determine the position of the spray nozzle 27, and the spray nozzle 27 can be moved at a predetermined speed along a planned movement line.

[0040] In addition, "spraying" in the present invention includes various materials such as general concrete spraying, mortar spraying, etc. It is desirable to set the distance from the spraying nozzle 27 to the sprayed surface at the optimum position where the rebound rate is minimized.

[0041] [Spray nozzle device 5] The spray nozzle device 5 of the spray machine 2 is equipped with distance measuring devices 6, 6 . . . for measuring the distance to the tunnel wall surface.

[0042] The spray nozzle device 5 has a mounting base 7 for distance measuring devices 6, 6... at the base end of the spray nozzle 27, the mounting base 7 being formed by a frame-shaped member 8 and having a ring-shaped hollow tubular annular header 9 on the outer periphery of the frame-shaped member 8, a plurality of distance measuring device mounting plates 10, 10... being installed on the upper surface of the frame-shaped member 8, a distance measuring device 6 being fixed to the upper surface of each of these distance measuring device mounting plates 10, branch pipes 11A, 11B rising from the annular header 9 at the locations where each distance measuring device 6 is installed, cleaning nozzles 12A, 12B being installed on these branch pipes 11A, 11B for spraying cleaning agent toward the distance measuring device 6, and a space is formed around each distance measuring device 6 for rebound shotcrete to fall.

[0043] This will be described in more detail below.

[0044] The mounting base 7 is composed of a frame-shaped member 8, an annular header 9 provided on the outer periphery of this frame-shaped member 8, and a distance measuring instrument installation plate 10 fixed to the installation location of the distance measuring instrument 6.

[0045] As shown in Figure 5, the frame-like member 8 is composed of a closed-shaped frame member 8A formed in a hexagonal shape and arm members 8a, 8a... extending outward from the outer surface of the frame member 8A at the locations where the distance measuring devices 6 are arranged. In other words, arm-like members 8a extending outward are provided at the center of each side of the hexagonal frame member 8A, which is shaped to match the number of distance measuring devices 6. The arm-like members 8a are L-shaped in side view and support the annular header 9 at their tips. The frame member 8A also has bolt installation holes 8b in its frame portion to hold the spray nozzles 27.

[0046] The annular header 9 is a hollow ring-shaped tubular member for supplying a cleaning agent. Specifically, as shown in FIG. 6 , it has a horizontal trapezoidal hollow cross section in cross section and a ring-like shape in plan view. The cross-sectional shape can be any shape, such as a circle or a polygon. However, the cross-sectional shape is a horizontal trapezoidal shape to facilitate the installation of branch pipes 11, which are installed at appropriate intervals around the circumference, and to provide a flat branch pipe installation surface. As shown in FIG. 6A , the installation locations of the branch pipes 11 are located at 60° intervals in accordance with the installation positions of the distance measuring devices 6, and branch pipe installation screw holes 9a are formed on both sides of the 60° direction line S. In addition, one or more screw holes 9b (two screw holes 9b in the illustrated example, 180° apart) are formed on the underside of the tubular header 9, and connection couplers 13 for supplying air, water, etc. are provided. In this embodiment, two cleaning nozzles 12 are provided per distance measuring device, so the branch pipe mounting screw holes 9a are formed one on each side across the 60° direction line S, but if one cleaning nozzle 12 is provided per distance measuring device, it is sufficient to provide one branch pipe mounting screw hole 9a at a position on the 60° direction line S. The cleaning agent can be, for example, air, water, or a concrete remover, or a combination thereof.

[0047] On the other hand, the distance measuring device installation plate 10 is a member that serves as a base for installing the distance measuring device 6, as shown in detail in FIG. 7. More specifically, as shown in FIG. 7, rectangular base plates 10A, 10A... are formed at the installation location of the distance measuring device 6, and a petal-shaped member connected to each other at the center is used. The distance measuring device 6 is fixed to the upper surface of the base plate 10A with screws, and an opening 10a is formed for passing an electric cable through. In the illustrated example, for ease of assembly, six base plates 10A are connected to each other at the center to form a single plate material, but it is also possible to configure the distance measuring device installation plate 10 by providing individual base plates 10A at the installation locations of each distance measuring device 6.

[0048] As shown in Figure 8, the frame-like member 8, the annular header 9, and the distance measuring instrument installation plate 10 are assembled by installing the tubular header 9 so that it is supported by the tip of the arm-like member 8a of the frame-like member 8, and connecting the two by welding, and then positioning the distance measuring instrument installation plate 10 at the connecting portion between the frame material 8A of the frame-like member 8 and the arm member 8a so that it straddles the frame material 8A and the arm member 8a, and connecting the two by welding. The completed assembly state is shown in Figure 9.

[0049] Once assembly of the mounting base 7 is complete, the distance measuring devices 6 are fixed to each base plate 10A of the distance measuring device installation plate 10, as shown in Figure 4. Any distance measuring device can be used as the distance measuring device 6, such as an optical distance measuring device, laser distance measuring device, ultrasonic distance measuring device, or radar distance measuring device. However, since optical distance measuring devices and laser distance measuring devices may not be able to measure due to noise caused by dust or rebound, it is preferable to use a radar distance measuring device that uses short-wavelength microwaves or millimeter waves, which are resistant to noise from environmental factors, etc. Furthermore, using short-wavelength microwaves or millimeter waves can improve measurement accuracy.

[0050] In this embodiment, six distance measuring devices 6, 6... are arranged at equal intervals around the spray nozzle 27. Even when the spray nozzle 27 is controlled to move in any direction, there are at least two distance measuring devices 6 in front of the movement direction and at least two distance measuring devices 6 in rear of the movement direction. The distance measuring devices 6, 6 located in front of the movement direction measure the distance before spraying, and the distance measuring devices 6, 6 located in rear of the movement direction measure the distance after spraying. The difference between these distance measuring devices calculates the spray thickness. In other words, as the spray nozzle 27 is moved along the tunnel wall at any distance from the excavation wall, the spray thickness can be grasped in real time. It is preferable that the distance measuring devices 6 have their radar bodies covered with a white bulb-shaped shade to protect them from dust and dirt, and a controller built into the base. Each distance measuring device 6 is fixed to the base plate 10A of the rangefinder installation plate 10 with screws.

[0051] Since the spraying basically moves alternately clockwise and counterclockwise around the tunnel, the distance measuring devices 6 must be placed at least in front of and behind the movement direction of the spray nozzle 27. Therefore, the minimum number of distance measuring devices 6 to be placed is two, but it is desirable to place them in at least four or more locations, including positions in front and behind the spray nozzle in the tunnel circumferential direction and positions in front and behind the spray nozzle in the tunnel direction.

[0052] Further, a branch pipe 11 is screwed into the branch pipe mounting screw hole 9a of the annular header 9 on the mounting base 7. The branch pipe 11 is attached so as to stand upright from the annular header 9. Two branch pipes 11A, 11B are attached to one distance measuring device 6, and these two branch pipes 11A, 11B are at different heights. Second branch pipes 11C, 11D are connected obliquely downward from the tip of each branch pipe 11A, 11B, and cleaning nozzles 12A, 12B that spray cleaning agent toward the distance measuring device 6 are provided at the tip of these second branch pipes 11C, 11D, respectively.

[0053] As shown in Fig. 4(A), the cleaning nozzles 12A and 12B are nozzles with horizontal slit-shaped injection ports to ensure a wide projection width, and are configured to inject the cleaning agent from a relatively upper position toward the distance measuring device 6. The cleaning agent can be any one of air, water, and a concrete stripping agent, or a combination thereof.

[0054] In the device of the present invention, as can be seen from a plan view of the spray nozzle device 5 as shown in Figure 4, a space is formed around each distance measuring device 6 for the rebounded shotcrete to fall. Therefore, the rebounded shotcrete passes through the space and falls, preventing it from accumulating. Cleaning The cleaning agent is continuously or intermittently sprayed from the nozzle 12 to wash away the sprayed concrete adhering to the distance measuring device 6, thereby making it possible to continuously maintain the function of the distance measuring device 6.

[0055] [Other examples] (1) In this embodiment, the spraying machine 1 is described as having a spraying nozzle 27 attached to the tip of a multi-jointed boom that can be controlled to move along the tunnel wall surface at an arbitrary distance from the excavation wall surface. However, the present invention can also be applied to a spraying nozzle device that is mounted on a circumferential rail that is arranged circumferentially at an approximately constant distance inside the excavation cross section and is movable along the circumferential rail. [Explanation of symbols]

[0056] 1...spraying machine, 2...spraying device, 3...erector device, 4...basket device, 5...spraying nozzle device, 6...distance measuring device, 7...mounting base, 8...frame-shaped member, 9...annular header, 10...distance measuring device installation plate, 11 (11A to 11D)...branch pipe, 12 (12A, 12B)...cleaning nozzle, 27...spraying nozzle

Claims

1. In a spray nozzle device equipped with a distance measuring device that measures the distance to a tunnel wall, A mounting base for a distance measuring device is provided at the base end of the spray nozzle, The mounting base is formed by a frame-shaped member, and has a ring-shaped hollow tube-shaped annular header on the outer periphery of the frame-shaped member, and is formed by installing a distance measuring instrument installation plate on the upper surface of the frame-shaped member, and distance measuring instruments are fixed to the distance measuring instrument installation plate, and branch pipes are provided that rise from the annular header at the locations where each distance measuring instrument is installed, and cleaning nozzles are provided on the branch pipes to spray cleaning agent toward the distance measuring instruments, A spray nozzle device equipped with a distance measuring device, characterized in that a space is formed around each distance measuring device for rebound shotcrete to fall.

2. In a spray nozzle device equipped with a distance measuring device that measures the distance to a tunnel wall, A mounting base for a distance measuring device is provided at the base end of the spray nozzle, the mounting base being fitted around the spray nozzle, The mounting base is composed of a frame-like member consisting of a closed-shaped frame material and arm members extending outward from the outer surface of the frame material at the locations where the distance measuring devices are arranged, ring-shaped hollow tubular annular headers supported at the tips of the arm members, and distance measuring device installation plates installed on the upper surface of the frame material and arm members at the locations where the distance measuring devices are arranged, straddling the frame material and arm members, a distance measuring instrument is fixed to the upper surface of each distance measuring instrument installation plate, a branch pipe is provided that stands up from the annular header at the location where each distance measuring instrument is installed, and a cleaning nozzle is provided on the branch pipe to spray a cleaning agent toward the distance measuring instrument from a relatively upper position; A spray nozzle device equipped with a distance measuring device, characterized in that a space is formed around each distance measuring device for rebound shotcrete to fall.

3. 3. A spray nozzle device equipped with a distance measuring device according to claim 1, wherein the distance measuring devices are disposed at a position on the front side of the moving direction of the spray nozzle and a position on the rear side of the moving direction of the spray nozzle.

4. A spray nozzle device equipped with a distance measuring device as described in either claim 1 or 2, wherein the distance measuring device is arranged in at least four locations, including positions in front and behind the spray nozzle in the tunnel circumferential direction and positions in front and behind the spray nozzle in the tunnel direction.

5. 5. The spray nozzle device equipped with a distance measuring device according to claim 1, wherein the cleaning agent is air, water, a concrete remover, or a combination thereof.

6. 6. A spray nozzle device equipped with a distance measuring device according to claim 1, wherein a radar range finder is used as the distance measuring device.

7. 7. The spray nozzle device equipped with a distance measuring device according to claim 1, wherein a nozzle having a horizontal slit-shaped jet nozzle is used as the cleaning nozzle.

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