JP2023058333A - Spraying nozzle device equipped with distance measuring device - Google Patents

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle device equipped with a distance measuring device for measuring the distance to a spray surface when spraying in a mountain tunnel.

For example, in the construction of mountain tunnels, the NATM construction method, which uses rock bolts inserted into the ground and shotcrete constructed along the excavated wall surface as main support members, is the mainstream. Excavation methods are roughly classified into a blasting method that excavates with explosives, a TBM method that uses a full-section excavator called TBM, and a mechanical excavation method that uses a free-section excavator with a cutter boom.

Conventionally, as shown in FIG. 10, the above-mentioned shotcrete work is mainly carried out by attaching a boom 61 for holding a spray nozzle to a mobile carriage 60 such as a crawler type, tire type or rail type. A spray machine is used in which the spray nozzle 62 is operated by operating the boom.

The spraying work consists of a nozzle man who controls the nozzle, a sprayer operator who operates the sprayer, and a ready-mixed concrete driver who supplies the sprayed concrete to the sprayer while the sprayer is installed near the face. However, it is a difficult work in a confined space, and even if ventilation equipment is installed, the work is forced to work in a harsh environment exposed to relatively high concentrations of dust. rice field.

Therefore, in recent years, attempts have been made to automate the spraying work in tunnels, that is, to make the spraying work unmanned or automated by remote control.

For example, in Patent Document 1 below, at a spraying work site; A camera for monitoring the spraying work by the spraying robot is installed at a remote control portion; a computer for data processing and monitor display of measurement signals measured by the light wave rangefinder; A group of devices installed at the spraying work site, including a spraying robot remote control operator for remotely controlling the spraying robot and a monitor device for displaying images taken by the camera. Disclosed is a remote control system for spraying work in underground excavation, in which various signals between a group of devices installed in a remote control part are connected to be able to transmit spatially by radio waves by wireless communication, or by wire transmission by signal cables. It is

The inventors of the present invention also proposed in Patent Document 2 below that an articulated boom that can be moved along the tunnel wall at an arbitrary distance from the excavation wall by the NATM construction method. In spraying with a sprayer holding a spray nozzle,
Place a distance measuring device to measure the distance to the tunnel wall,
In the process of moving the spray nozzle along the tunnel wall surface and spraying, the moving speed of the spray nozzle is measured, and the distance before and after spraying is measured by the distance measuring device. Measure the spray thickness by spraying, and obtain a proportional relational expression between the moving speed of the spray nozzle and the spray thickness,
Under the condition that unevenness exists on the tunnel excavation wall surface, at the initial stage of spraying by moving the spraying nozzle while keeping the pressure feed amount of the spraying material constant, relatively based on the proportional relational expression We have proposed a tunnel spray control method that corrects the spray surface by slowing down the moving speed in concave portions and increasing the moving speed in convex portions.

JP-A-2000-120394 JP 2019-167678 A

In Patent Documents 1 and 2, a distance measuring device for measuring the distance to the wall surface is arranged in the spray nozzle portion. The inventors of the present invention made a prototype of the mounting base for the distance measuring instrument, and when they actually sprayed it, the rebound of the shotcrete adhered to the distance measuring instrument, especially when spraying upward, and this gradually As a result, it was found that this deposited shotcrete caused a situation in which measurement could not be continued.

Therefore, the main object of the present invention is to prevent the rebound shotcrete from accumulating on the distance measuring device in a spraying nozzle device equipped with a distance measuring device for measuring the distance to the tunnel wall surface, making measurement impossible. That's what it is.

In order to solve the above problems, the present invention according to claim 1 is a spray nozzle device equipped with a distance measuring device for measuring the distance to the tunnel wall surface,
Equipped with a mounting base for a distance measuring instrument at the base end of the spray nozzle,
The mounting base is composed of a frame-shaped member, has a ring hollow tube-shaped annular header on the outer periphery of the frame-shaped member, and is configured by installing a distance measuring instrument installation plate on the upper surface of the frame-shaped member, A distance measuring instrument is fixed to the distance measuring instrument installation plate, and a branch pipe standing upright from the annular header is provided at each of the distance measuring instrument installation portions, and a cleaning agent is supplied to the branch pipe toward the distance measuring instrument. Provide a cleaning nozzle that sprays,
There is provided a spraying nozzle device equipped with a distance measuring device, characterized in that a space is formed around each of the distance measuring devices so that rebounded shotcrete can drop.

In the invention according to claim 1, the mounting base on which the distance measuring instrument is installed is constituted by a frame-shaped member, and has a ring hollow tubular annular header on the outer periphery of the frame-shaped member. It is configured by installing a distance measuring instrument installation plate on the Then, a distance measuring instrument is fixed to the distance measuring instrument installation plate, a branch pipe rising from the annular header is provided at each of the distance measuring instrument installation positions, and the branch pipe is cleaned toward the distance measuring instrument. A cleaning nozzle for injecting an agent is provided, and a space is formed around each distance measuring device for the rebounded shotcrete to drop.

Therefore, since the rebounded shotcrete falls through the space, it can be prevented from gradually accumulating, and the cleaning agent can be continuously or intermittently injected from the injection nozzle, thereby making it possible to measure the distance. Since the shotcrete adhering to the surface is washed away, it is possible to maintain the function of the distance measuring instrument continuously.

As the present invention according to claim 2, in a spray nozzle device equipped with a distance measuring device for measuring the distance to the tunnel wall surface,
A base end of the spray nozzle is provided with a mounting base for a distance measuring instrument that fits around the spray nozzle,
The mounting base is a frame-shaped member comprising a closed-shaped frame member and an arm member extending outward from the outer surface of the frame member at the location where the distance measuring instrument is arranged, and a ring supported by the tip of these arm members. It is composed of a hollow tubular annular header and a distance measuring instrument installation plate installed on the upper surface of the frame member and the arm member at the location where each distance measuring instrument is arranged,
A distance measuring instrument is fixed on the upper surface of each distance measuring instrument mounting plate, and a branch pipe is provided standing from the annular header at the position where each distance measuring instrument is arranged, and the distance from the upper position relative to the branch pipe is provided. A cleaning nozzle that injects a cleaning agent toward the measuring instrument is provided,
There is provided a spraying nozzle device equipped with a distance measuring device, characterized in that a space is formed around each of the distance measuring devices so that rebounded shotcrete can drop.

The invention according to claim 2 proposes a more specific structure of the spray nozzle device. In this device as well, rebounded shotcrete passes through the space and falls, so that it can be prevented from gradual accumulation. Since the shotcrete adhering to the distance measuring instrument is washed away, the function of the distance measuring instrument can be maintained continuously.

According to a third aspect of the present invention, the distance measuring devices are arranged at a position on the front side in the moving direction of the spray nozzle and a position on the rear side in the moving direction of the spray nozzle, respectively. A spray nozzle device with a distance measuring device is provided.

In the third aspect of the present invention, regarding the arrangement of the distance measuring device, on the premise that the spray nozzle is moved in the tunnel circumferential direction, the position that is the front side in the moving direction of the spray nozzle and the rear side in the moving direction. are placed in different positions. These distance measuring instruments make it possible to measure the spray thickness of the spray.

According to a fourth aspect of the present invention, the distance measuring device includes at least a front-rear position straddling the spray nozzle in the tunnel circumferential direction and a front-rear position straddling the spray nozzle in the tunnel direction. A spray nozzle device provided with the distance measuring devices according to any one of claims 1 and 2 arranged at four or more locations is provided.

In the invention according to claim 4, in order to correspond to an arbitrary moving direction of the spray nozzle, the distance measuring device is set at the front and rear positions straddling the spray nozzle with respect to the tunnel circumferential direction and at the position of the spray nozzle with respect to the tunnel direction. are provided in at least four positions including the front and rear positions straddling the .

As the present invention according to claim 5, there is provided a spray nozzle device equipped with a distance measuring device according to any one of claims 1 to 4, wherein the cleaning agent is one or a combination of air, water, and a concrete remover. be done.

The invention according to claim 5 specifies a specific example of the cleaning agent. Specifically, any one or a combination of air, water, and a concrete remover can be used as the cleaning agent.

As a sixth aspect of the present invention, there is provided a spray nozzle device equipped with the distance measuring device according to any one of the first to fifth aspects, wherein a radar range finder is used as the distance measuring device.

In the sixth aspect of the invention, any rangefinder such as a light wave rangefinder, a laser rangefinder, an ultrasonic rangefinder or a radar rangefinder can be used as the rangefinder. With laser rangefinders, dust and rebounds tend to become noise and may not be able to measure, so it is better to use a radar rangefinder that uses microwaves and millimeter waves with short wavelengths that are resistant to noise such as environmental factors. desirable.

As a seventh 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 sixth aspects, wherein a nozzle having a horizontal slit-shaped ejection port is used as the ejection nozzle.

In the seventh aspect of the present invention, a nozzle having a horizontal slit-shaped injection port is used as the injection nozzle. The shotcrete can not be removed efficiently with the injection nozzle that sprays in a dot pattern, but if the injection nozzle has a horizontal slit shape to secure the projection width, the shotcrete that adheres can be removed effectively. become.

As described in detail above, according to the present invention, in a spraying nozzle device equipped with a distance measuring device for measuring the distance to the tunnel wall surface, it is possible to prevent the rebounding shotcrete from accumulating on the distance measuring device and making measurement impossible. can be prevented.

1 is a side view of a sprayer 1; FIG. 1 is a plan view of a sprayer 1; FIG. 1(A) is a plan view and (B) is a side view showing the spraying device 2. FIG. 1(A) is a plan view and (B) is a side view showing a spray nozzle device 5. FIG. 3(A) is a plan view and (B) is a side view showing a frame-like member 8. FIG. FIG. 3(A) is a plan view showing an annular header 9, (B) is a view taken along the line B-B of (A), and (C) is a view taken along the line CC of (A). 3 is a plan view of the distance measuring instrument installation plate 10. FIG. FIG. 3 is an assembly procedure diagram of the frame-shaped member 8, the annular header 9, and the distance measuring instrument installation plate 10; FIG. 2(A) is a plan view, and (B) is a view taken along the line BB of (A), showing an assembled state of the frame-shaped member 8, the annular header 9, and the distance measuring instrument mounting plate 10; FIG. 4 is a side view showing a spraying procedure using a sprayer 60;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Regarding spraying machine 1]
For excavation of mountain tunnels, heavy equipment for tunnel construction such as a drill jumbo, a sprayer 1, and a wheel loader are placed near the face, and for example, the upper half and After drilling the rock bolts and drilling the charge hole and charge in parallel in each of the lower halves, the upper and lower halves were cut down at once by blasting. Excavation is performed for each cycle in the order of erection → secondary spraying → rock bolting. In addition, a center will be placed behind the face, and the concrete lining and invert construction will be carried out.

As shown in FIGS. 1 and 2, the spraying machine 1 has a spraying device 2 and an erector device 3 attached to a carriage body 50 which is automatically lowered by a crawler 51 driven by a power source. , a basket device 4 (hereinafter also referred to as a sprayer with an erector device). This spraying machine 1 is used for primary spraying work, erection work of steel shoring, and secondary spraying work.

The spraying device 2 is provided at the center of the front portion of the truck body 50, as shown in detail in FIG. A first arm 21 is rotatably supported about a horizontal shaft 20a with respect to the base 20 on the carriage body 50 side, and is oscillated in the vertical direction by expansion and contraction of a hydraulic cylinder 21A. The base end portion 20A of the first arm 21 is supported as a whole so as to be able to swing about a vertical axis 20b, and can be horizontally swung by turning hydraulic cylinders 21B and 21C arranged on the side. ing.

A second arm 22 is accommodated inside the first arm 21 and is telescopically movable by a first telescopic hydraulic cylinder 24. A third arm 23 is accommodated inside the second arm 22, and a third arm 23 is accommodated inside the second arm 22. 2 It is made telescopic by the hydraulic cylinder 25 for extension and retraction. In addition, around the first arm, the second arm 22 and the third arm 23, a covering material 27 is provided which can be expanded and contracted in conjunction with the expansion and contraction of the arms, so that rebounded shotcrete does not adhere to the arms. It is designed to prevent a situation in which it becomes unstretchable.

A spray nozzle device 5 is supported at the tip of the third arm 23 . The spray nozzle device 5 is capable of swinging in a predetermined angular range in the horizontal and vertical directions by means of a built-in motor for horizontal rotation and a motor for vertical movement. It can be sprayed against the wall surface. This spray nozzle device 5 will be further described later.

The basket device 4 is a facility for workers to board, and as shown in FIG. . A telescopic boom 41 that can be extended and retracted by a telescope mechanism is provided with a base 40 on the carriage body 50 side as a base end, and a lift deck 42 is held at the tip of the telescopic boom 41 . As shown in FIG. 1, the telescopic boom 41 can be raised and lowered vertically by hydraulic cylinders 41A and 41B with the base end side as a fulcrum, and can also be swung horizontally by hydraulic cylinders (not shown). It is movable. The lift deck 42 is connected via a connecting portion 43 and supported by a hydraulic cylinder 44 so as to be vertically swingable.

The erector device 3 is a facility for erecting a steel shoring at a predetermined position, and as shown in FIGS. It is Most of the steel shorings are connected at the top end to form a single arch material. The erector device 3B arranged on the left side lifts the split steel shoring on the left side and sets it at a predetermined position. For the connection work at the top end, a worker gets into the bucket device 4 and approaches the connection portion to perform the bolt connection work.

As shown in FIGS. 1 and 2, the spraying operation by the sprayer 1 is carried out by positioning the sprayer 1 at a spraying site near the tunnel face and measuring the position coordinates of the sprayer 1 and The posture state is clarified by measurement. All coordinate data such as tunnel shape coordinate data and measurement spray shape line data are input to the controller, and the measurement of the position coordinates of the spray nozzle 27 and the coordinates for movement control of the spray nozzle 27 are managed. This is because the coordinate state of the spraying machine 1 must first be grasped in order to do so.

Specifically, a total station for measurement is installed in the tunnel pit, and at least two reference points (not shown) are installed in advance in the tunnel pit. The installation coordinates of the total station are obtained by the posterior resection method based on the distance measurement and angle measurement data obtained by collimating the two reference points with the total station. It should be noted that the positional coordinates of the total station are checked at appropriate time intervals to check for any positional deviation.

Also, at least two collimation targets are installed at the rear of the spray gun 1 . These two collimation targets are spaced apart in the horizontal direction and installed at different heights in the vertical direction. , the posture state (roll angle, pitch angle, yaw angle) of the spraying machine 1 can be obtained. The position and attitude of the spray gun 1 are determined by installing one collimation target at the rear part of the gun spray machine 1 and attaching a 3-axis angle sensor to the fuselage, obtaining coordinates from the collimation target, In addition, the attitude state may be grasped by the three-axis angle sensor.

In controlling the movement of the spray nozzle 27, for example, a plurality of motion cameras are installed on the front side of the spray machine 1, and collimation targets (LED markers) are installed on the spray nozzle 27. By continuously measuring the coordinates of the collimation target, the position of the spray nozzle 27 can be determined and moved at a predetermined speed along a planned line of movement.

In addition, the "spraying" in the present invention includes general concrete spraying as well as various materials such as mortar spraying. Moreover, it is desirable to set the separation distance from the spray nozzle 27 to the spray surface at an optimum position where the rebound rate is minimized.

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

The spray nozzle device 5 includes a mounting base 7 for the distance measuring instruments 6, 6 . . . at the base end of the spray nozzle 27. A ring hollow tube-shaped annular header 9 is provided on the outer periphery of the member 8, and a plurality of distance measuring instrument mounting plates 10, 10 . . . , and branch pipes 11A and 11B standing up from the annular header 9 are provided at the locations where each distance measuring device 6 is arranged. Cleaning nozzles 12A and 12B for spraying a cleaning agent are provided at the bottom, and a space is formed around each distance measuring device 6 for the rebound shotcrete to drop.

More specific details will be given below.

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

As shown in FIG. 5, for example, the frame-like member 8 includes a closed-shaped frame member 8A formed in a hexagonal shape, and an outer surface of the frame member 8A extending outward from the outer surface of the frame member 8A at the position where the distance measuring device 6 is arranged. Extending arm members 8a, 8a, . . . That is, an arm member 8a extending outward is provided at the center of each side of a hexagonal frame member 8A corresponding to the number of distance measuring devices 6. As shown in FIG. The arm-shaped member 8a has an L-shape when viewed from the side, and supports the annular header 9 at its distal end. Further, the frame member 8A has a bolt installation hole 8b in the frame portion to hold the spray nozzle 27. As shown in FIG.

The annular header 9 is a ring hollow tubular member for supplying cleaning agent. More specifically, as shown in FIG. 6, it is a member that has a horizontal trapezoidal hollow cross section when viewed in cross section and a ring shape when viewed from above. The cross-sectional shape may be any shape such as circular or polygonal. Therefore, the cross-sectional shape is a horizontal trapezoid. As shown in FIG. 4A, the branch pipes 11 are installed at positions spaced apart by 60° from the central angle in accordance with the installation position of the distance measuring device 6. A branch pipe mounting screw hole 9a is formed. One or a plurality of screw holes 9b are provided on the lower surface of the tubular header 9. In the illustrated example, two screw holes 9b are provided in the 180° direction, and connection couplers 13 for supplying air or water are provided. In this embodiment, since two cleaning nozzles 12 are provided for each distance measuring device, one branch pipe mounting screw hole 9a is formed on each side across the 60° direction line S. However, when one cleaning nozzle 12 is provided for each distance measuring device, one branch pipe mounting screw hole 9a may be provided at a position on the 60° direction line S. As shown in FIG. As the cleaning agent, for example, air, water, or a concrete remover, or a combination thereof, can be used.

On the other hand, the distance measuring instrument mounting plate 10 is a member that serves as a base for installing the distance measuring instrument 6, as shown in detail in FIG. Specifically, as shown in FIG. 7, rectangular base plates 10A, 10A, . 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 inserting an electric cable. In the illustrated example, the six pedestal plates 10A are connected to each other on the center side to form one plate material for convenience of assembly. It is also possible to configure the distance side installation plate 10 by providing a .

As shown in FIG. 8, the assembly of the frame member 8, the annular header 9, and the distance measuring instrument installation plate 10 is carried out by supporting the ends of the arm members 8a of the frame member 8 as shown in FIG. A tubular header 9 is installed, the two are connected by welding, and the connection portion between the frame member 8A and the arm member 8a of the frame member 8 is provided with the distance described above so as to straddle the frame member 8A and the arm member 8a. The measuring instrument installation plate 10 is positioned and both are connected by welding. FIG. 9 shows the assembled state.

When the assembly of the mounting base 7 is completed, the distance measuring instruments 6 are fixed to the base plates 10A of the distance measuring plate 10, as shown in FIG. Any rangefinder such as a light wave rangefinder, a laser rangefinder, an ultrasonic rangefinder, or a radar rangefinder can be used as the distance measuring device 6, but the light wave rangefinder and the laser rangefinder are prone to dust and rebound. It is desirable to use a radar rangefinder that uses microwaves or millimeter waves with short wavelengths, which is resistant to noise such as environmental factors, because it may become noise and cannot be measured. In addition, the use of microwaves and millimeter waves with short wavelengths can improve measurement accuracy.

In this embodiment, six distance measuring instruments 6, 6, . . . are arranged around the spray nozzle 27 at regular intervals. Even if the spray nozzle 27 is controlled to move in any direction, the distance measuring device 6 has at least two distance targets 6, 6 on the front side in the moving direction and at least two distance measuring devices on the rear side in the moving direction. , the distance before spraying is measured by the distance measuring devices 6, 6 positioned on the front side in the moving direction, and the distance after spraying is measured by the distance measuring devices 6, 6 positioned on the rear side in the moving direction. and the spray thickness is calculated from these differences. That is, in the process of spraying while moving the spray nozzle 27 along the tunnel wall surface with an arbitrary distance from the excavation wall surface, it is possible to grasp the spray thickness by the spraying in real time. It has become. The distance measuring instrument 6 preferably has a radar main body covered with a light-bulb-shaped white shade for dust-proof and anti-fouling purposes, and has a built-in controller inside the base. Each distance measuring instrument 6 is fixed to the pedestal plate 10A of the distance measuring plate 10 by screwing.

Since the spraying is basically alternately moved clockwise and counterclockwise in the circumferential direction of the tunnel, the distance measuring device 6 is positioned at least at the front side in the moving direction of the spray nozzle 27. and a position on the rear side in the moving direction. Therefore, although the minimum number of the distance measuring devices 6 to be arranged is two, the front and rear positions straddling the spray nozzles in the tunnel circumferential direction and the front and rear positions straddling the spray nozzles in the tunnel direction. It is desirable to be arranged in at least four locations including

Further, a branch pipe 11 is screwed into the branch pipe mounting screw hole 9 a of the annular header 9 on the mount 7 . The branch pipes 11 are attached so as to stand upward from the annular header 9 . Two pipes are installed for one distance measuring device 6, and these two branch pipes 11A and 11B are made to have different heights. The second branch pipes 11C and 11D are connected obliquely downward from the tips of the respective branch pipes 11A and 11B, and the cleaning agent is sprayed toward the distance measuring device 6 to the tips of the second branch pipes 11C and 11D. Nozzles 12A and 12B are provided respectively.

As shown in FIG. 4(A), the cleaning nozzles 12A and 12B are nozzles having horizontal slit-shaped injection ports in order to secure the projection width. It is designed to spray the cleaning agent toward the Any one or a combination of air, water, and a concrete remover can be used as the cleaning agent.

In the device of the present invention, as shown in FIG. 4, when the spray nozzle device 5 is seen from above, there is a space around each distance measuring device 6 for the rebounded sprayed concrete to fall. is formed. Therefore, rebounded shotcrete passes through the space and falls, so that it can be prevented from accumulating. Since the shotcrete adhering to the surface is washed away, the function of the distance measuring instrument 6 can be maintained continuously.

[Other form examples]
(1) In this embodiment, the sprayer 1 has a spray nozzle 27 held at the tip of an articulated boom that can be controlled to move along the tunnel wall at an arbitrary distance from the excavation wall. , For example, a spray nozzle device mounted on a circumferential rail arranged along the circumferential direction at a substantially constant distance inside the excavation cross section and movable along the circumferential rail can be applied in the same way.

DESCRIPTION OF SYMBOLS 1... Spray machine, 2... Spray apparatus, 3... Erector apparatus, 4... Basket apparatus, 5... Spray nozzle apparatus, 6... Distance measuring instrument, 7... Mounting base, 8... Frame-shaped member, 9... Annular header , 10... distance measuring instrument installation plate, 11 (11A to 11D)... branch pipe, 12 (12A, 12B)... cleaning nozzle, 27... spraying nozzle

Claims (7)

In a spray nozzle device equipped with a distance measuring device that measures the distance to the tunnel wall surface,
Equipped with a mounting base for a distance measuring instrument at the base end of the spray nozzle,
The mounting base is composed of a frame-shaped member, has a ring hollow tube-shaped annular header on the outer periphery of the frame-shaped member, and is configured by installing a distance measuring instrument installation plate on the upper surface of the frame-shaped member, A distance measuring instrument is fixed to the distance measuring instrument installation plate, and a branch pipe standing upright from the annular header is provided at each of the distance measuring instrument installation portions, and a cleaning agent is supplied to the branch pipe toward the distance measuring instrument. Provide a cleaning nozzle that sprays,
A spraying nozzle device equipped with a distance measuring device, wherein a space is formed around each of the distance measuring devices so that rebounded shotcrete falls. In a spray nozzle device equipped with a distance measuring device that measures the distance to the tunnel wall surface,
A base end of the spray nozzle is provided with a mounting base for a distance measuring instrument that fits around the spray nozzle,
The mounting base is a frame-shaped member comprising a closed-shaped frame member and an arm member extending outward from the outer surface of the frame member at the location where the distance measuring instrument is arranged, and a ring supported by the tip of these arm members. It is composed of a hollow tubular annular header and a distance measuring instrument installation plate installed on the upper surface of the frame member and the arm member at the location where each distance measuring instrument is arranged,
A distance measuring instrument is fixed on the upper surface of each distance measuring instrument mounting plate, and a branch pipe is provided standing from the annular header at the position where each distance measuring instrument is arranged, and the distance from the upper position relative to the branch pipe is provided. A cleaning nozzle that injects a cleaning agent toward the measuring instrument is provided,
A spraying nozzle device equipped with a distance measuring device, wherein a space is formed around each of the distance measuring devices so that rebounded shotcrete falls. 3. Spraying equipped with a distance measuring device according to claim 1, wherein said distance measuring device is arranged at a position on the front side in the moving direction of said spray nozzle and a position on the rear side in the moving direction of said spray nozzle. nozzle device. The distance measuring devices are arranged at at least four positions including front and rear positions straddling the spray nozzles in the tunnel circumferential direction and front and rear positions straddling the spray nozzles in the tunnel direction. A spray nozzle device comprising the distance measuring device according to any one of items 1 and 2. A spray nozzle device equipped with a distance measuring device according to any one of claims 1 to 4, wherein the cleaning agent is one or a combination of air, water, and a concrete remover. A spray nozzle device equipped with a distance measuring device according to any one of claims 1 to 5, wherein a radar range finder is used as the distance measuring device. 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 injection port is used as the spray nozzle.

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