Spray nozzle device equipped with distance measuring device

Abstract

To provide a spray nozzle device provided with a distance measuring device measuring distance to a tunnel wall surface capable of preventing the distance measuring device from being unmeasurable through accumulation of a sprayed concrete rebounded thereon.SOLUTION: A spray nozzle device 5 is provided with a base plate 7 with which measuring devices 6 are installed on a base end of a spray nozzle 27, wherein a plurality of distance measuring devices 6 are installed with an adequate space to each other in a circumferential direction on an upper surface of the base plate 7 and a cylindrical member 8 for installing the spray nozzle 27 in a penetrated state is prepared on a central part of the base plate 7. At an upper side of the cylindrical member 8, a bearing 9 of which an inner race is fixed, a cover plate 10 in a circular shape rotatably supported through direct or indirect connection to an outer ring of the bearing 9 and covering the plurality of distance measuring devices 6 and formed of material transparent to electric waves from the distance measuring device 6, and rotation means rotating the covering plate 10 around a center axis are provided.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a spraying nozzle device provided with a distance measuring instrument for measuring the distance to the spraying surface when spraying in a mountain tunnel.

Background Art

[0002] For example, in the construction of mountain tunnels, the NATM method, which uses rock bolts inserted into the ground and shotcrete constructed along the excavation wall surface as the main support members, is the mainstream. Excavation methods are roughly classified into a blasting method in which excavation is carried out using explosives, a TBM method using a full-face tunneling machine called a TBM, and a mechanical excavation method using a free-face tunneling machine having a cutter boom.

[0003] Conventionally, the above-mentioned shotcrete work has mainly been carried out using a spraying machine in which a boom 61 for holding a spraying nozzle is attached to a movable crawler type, tire type, rail type, or the like trolley 60 as shown in FIG. 8, and the spraying nozzle 62 is operated by operating this boom.

[0004] The above spraying work is carried out by workers such as a nozzleman who controls the nozzle, a spraying machine operator who operates the spraying machine, and a fresh concrete driver who supplies the spraying concrete to the spraying machine while the spraying machine is installed near the face. However, it is a strenuous operation in a narrow space, and workers are forced to work in a bad environment where they are exposed to relatively dense dust even if, for example, ventilation equipment is provided.

[0005] 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.

[0006] For example, Patent Document 1 discloses a remote control system for spraying work in underground excavation, in which the group of devices installed at the spraying work site is equipped with an optical wave rangefinder for measuring the shape of the inner wall surface of the spraying work area, a remotely operated spraying robot, and a camera for monitoring the measurement work by the optical wave rangefinder and the spraying work by the spraying robot, and the remote control unit is equipped with a computer for processing and displaying the measurement signals measured by the optical wave rangefinder, a remote control operator for the spraying robot for remotely operating the spraying robot, and a monitor device for displaying images captured by the camera, and various signals between the group of devices installed at the spraying work site and the group of devices installed at the remote control unit are connected so as to be transmitted spatially by radio waves via wireless communication or so as to be transmitted via signal cables.

[0007] In the present invention, as described in Patent Document 2 below, when spraying is performed on the tunnel excavation wall surface using the NATM method, a spraying machine is used in which a spraying nozzle is held 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 surface, and during the process of moving the spraying nozzle along the tunnel wall surface and spraying, the movement speed of the spraying nozzle is measured, and the distance before and after spraying is measured using the distance measuring device to measure the spraying thickness, and a proportional relationship between the movement speed of the spraying nozzle and the spraying thickness is obtained, Under the condition that uneven areas exist on the tunnel excavation wall, we propose a tunnel spraying control method that, in the initial stage of spraying while keeping the amount of sprayed material pumped constant and moving the spraying nozzle, adjusts the movement speed based on the proportional relationship formula to smooth the sprayed surface by relatively slowing down the movement speed in recessed areas and increasing the movement speed in convex areas. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2000-120394 [Patent Document 2] Japanese Patent Publication No. 2019-167678 [Overview of the project] [Problems that the invention aims to solve]

[0009] The technologies described in Patent Documents 1 and 2 are based on the premise that a distance measuring device is placed on the spray nozzle portion to measure the distance to the wall surface. The present inventors then prototyped a mounting base for the distance measuring device and actually performed spraying. However, it was found that, especially when spraying upwards, the rebound of the sprayed concrete adheres to the distance measuring device, and as this gradually accumulates, the measurement becomes impossible to continue due to the accumulated sprayed concrete.

[0010] Therefore, the main objective of the present invention is to prevent rebound sprayed concrete from accumulating on the distance measuring device, which is used to measure the distance to the tunnel wall, in a spray nozzle device equipped with a distance measuring device for measuring the distance to the tunnel wall, thereby preventing measurement from becoming impossible. [Means for solving the problem]

[0011] To solve the above problems, the present invention according to claim 1 provides a spray nozzle device equipped with a distance measuring device for measuring the distance to the tunnel wall, The base end of the spray nozzle is equipped with a base plate for mounting a distance measuring device. Multiple distance measuring devices are installed on the upper surface of the base plate at appropriate intervals in the circumferential direction, and a cylindrical member is provided in the center of the base plate for installing the spray nozzle in a penetrating state. A bearing with a fixed inner ring is provided at the upper position of the cylindrical member, and a disc-shaped covering plate is provided which is rotatably supported around a central axis by being indirectly or directly connected to the outer ring of the bearing, covers the plurality of distance measuring devices, and is made of a material that transmits radio waves from the distance measuring devices. A spray nozzle device is provided that includes a distance measuring instrument, characterized by having a rotating means for rotating the covering plate.

[0012] The above claims 1 In the described invention , blowing The nozzle is provided with a base plate at its base end for mounting a distance measuring device, and multiple distance measuring devices are mounted on the upper surface of the base plate at appropriate intervals in the circumferential direction. A cylindrical member is provided in the center of the base plate for mounting the spray nozzle through it. A bearing is provided at the upper side of the cylindrical member, with an inner ring fixed to the outer surface of the cylindrical member. A disc-shaped covering plate is provided, which is rotatably supported by being indirectly or directly connected to the outer ring of the bearing, covers the multiple distance measuring devices, and is made of a material that transmits electromagnetic waves from the distance measuring devices. The structure also includes a rotating means for rotating the covering plate around its central axis.

[0013] Therefore, even if the rebounded sprayed concrete falls onto the covering plate, the constant rotation of the covering plate causes it to move outward due to centrifugal force and fall off the covering plate, thus preventing the sprayed concrete from accumulating on the upper surface of the covering plate and enabling the distance measuring instrument to continuously maintain its function.

[0014] Claim 2 The present invention relates to the present invention, wherein the rotating means comprises a ring-shaped impeller indirectly or directly connected to the outer ring of the bearing, and one or more air nozzles that inject gas onto the impeller to rotate it. 1 A spray nozzle device equipped with the distance measuring instrument described is provided.

[0015] The above claims 2The described invention shows a preferred embodiment of the rotating means. Since the spraying machine is equipped with a compressor, it is desirable to adopt a rotating mechanism using a compression device. Specifically, it is desirable to have a structure including a ring-shaped impeller that is indirectly or directly connected to the outer ring of the bearing and is loosely fitted into the cylindrical member, and one or more air nozzles that inject gas to rotate the impeller.

[0016] Claim 3 Regarding the present invention according to claim 1, the covering plate is formed of resin, foamed resin, or a foamed resin composite material. 、2 A spraying nozzle device equipped with a distance measuring instrument according to any of the above claims is provided.

[0017] The above claim 3 The described invention shows a preferred embodiment of the covering plate. Specifically, it is possible to preferably use resin, foamed resin, or a foamed resin composite material composed of a combination of foamed resin and another material. Note that metal-based materials are not preferred because they inhibit the transmission of electromagnetic waves.

[0018] Claim 4 Regarding the present invention according to claim 1 to any of the following claims, a peripheral wall is provided that surrounds the space between the base plate and the covering plate in the circumferential direction. 3 A spraying nozzle device equipped with a distance measuring instrument according to any of the above claims is provided.

[0019] The above claim 4 In the described invention, a peripheral wall is provided to surround the space between the base plate and the covering plate in the circumferential direction. When the rebounded sprayed concrete adheres directly to the distance measuring instrument, it cannot be removed, so it is desirable to surround the space between the base plate and the covering plate with a peripheral wall.

[0020] Claim 5 Regarding the present invention according to claim 1 to any of the following claims, a washing water injection nozzle for removing the concrete adhering to the outer surface of the covering plate is provided. 4A spraying nozzle device equipped with a distance measuring instrument according to any one of the above is provided.

[0021] The above claim 5 The invention described is such that a washing water injection nozzle for removing the concrete adhering to the outer surface of the covering plate is provided. By injecting the washing water, the adhering sprayed concrete can also be washed away and removed, so that it is possible to further prevent the concrete from adhering to the upper surface of the covering plate.

[0022] Claim 6 As the invention according to claim, a scraper for scraping the concrete adhering to the outer surface of the covering plate is provided in claims 1 to 5 A spraying nozzle device equipped with a distance measuring instrument according to any one of the above is provided.

[0023] The above claim 6 The invention described is such that a scraper for scraping the concrete adhering to the outer surface of the covering plate is provided. By providing a scraper for scraping the concrete adhering to the covering plate, it is possible to surely remove it even when the adhesion force is strong, and it is further possible to prevent the distance measuring instrument from becoming unable to measure.

[0024] Claim 7 As the invention according to claim, a radar distance meter is used as the distance measuring instrument in claims 1 to 6 A spraying nozzle device equipped with a distance measuring instrument according to any one of the above is provided.

[0025] The above claim 7 In the invention described, a radar distance meter is used as the distance measuring instrument. As the distance measuring instrument, for example, any distance meter such as an optical wave distance meter, a laser distance meter, an ultrasonic distance meter, a radar distance meter, etc. can be used. However, in the case of an optical wave distance meter or a laser distance meter, dust and rebounds are likely to become noise and it may not be possible to measure. Therefore, it is desirable to use a radar distance meter that is resistant to noise such as environmental factors and uses microwaves or millimeter waves with short wavelengths.

Effects of the Invention

[0026] As described in detail above, according to the present invention, in a spray nozzle device equipped with a distance measuring instrument for measuring the distance to the tunnel wall, it is possible to prevent rebound sprayed concrete from accumulating on the distance measuring instrument and making measurement impossible. [Brief explanation of the drawing]

[0027] [Figure 1] This is a side view of spraying machine 1. [Figure 2] This is a plan view of spraying machine 1. [Figure 3] The image shows the spraying device 2; (A) is a plan view and (B) is a side view. [Figure 4] The image shows the spray nozzle device 5; (A) is a plan view and (B) is a cross-sectional view. [Figure 5] This is a perspective view showing the structure of the impeller 12. [Figure 6] This is a cross-sectional view showing the spray nozzle device 5A when a cleaning water spray nozzle 18 is provided. It is a view in the direction of the arrow. [Figure 7] The image shows the spray nozzle device 5B when a scraper 19 is provided; (A) is a plan view and (B) is a cross-sectional view. [Figure 8] This is a side view showing the spraying procedure using the spraying machine 60. [Modes for carrying out the invention]

[0028] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0029] [Regarding spraying machine 1] In mountain tunnel excavation, heavy tunnel construction equipment such as drill jumbos, spraying machines, and wheel loaders are positioned near the tunnel face. For example, the mini-bench method is used, where the upper and lower halves are excavated simultaneously. Rock bolt drilling and explosive holes / charges are made in parallel in the upper and lower halves, respectively. Then, the upper and lower halves are cut away all at once by blasting. After that, excavation is carried out in cycles following procedures such as spoil removal → check marking → primary spraying → steel support erection → secondary spraying → rock bolt installation. In addition, a centering is positioned behind the tunnel face, and the concrete lining and invert construction are carried out.

[0030] As shown in Figures 1 and 2, the spraying machine 1 is a heavy machine for tunnel work (hereinafter also referred to as a spraying machine with an erector device) equipped with a spraying device 2, an erector device 3, and a basket device 4 on a chassis body 30 that is self-propelled by crawlers 31 driven by a power source. This spraying machine 1 is used for primary spraying work, steel support construction work, and secondary spraying work.

[0031] The spraying device 2 is located in the center of the front of the trolley body 30, as shown in detail in Figure 3. The first arm 21 is pivotally supported on the base 20 on the trolley body 30 so as to be able to swing around a horizontal axis 20a, and swings in the vertical direction by the extension and retraction of a hydraulic cylinder 21A. In addition, the base end 20A of the first arm 21 is supported so as to be able to swing around a vertical axis 20b, and is able to swing horizontally by swivel hydraulic cylinders 21B and 21C located on the side.

[0032] The first arm 21 houses the second arm 22, which is extendable and retractable by the first extension hydraulic cylinder 24, and the second arm 23 houses the second arm 22, which is extendable and retractable by the second extension hydraulic cylinder 25. Furthermore, the first arm 21, the second arm 22, and the third arm 23 are surrounded by cover materials 28 that extend and retract in conjunction with the extension and retraction of the arms, in order to prevent rebound sprayed concrete from adhering to the arms and making them unable to extend or retract.

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

[0034] The basket device 4 is equipment for workers to ride in, and as shown in Figure 2, two units (4A, 4B) are provided in a pair on the left and right sides of the center at the front of the trolley body 30. A telescopic boom 41, which can be extended and retracted by a telescopic mechanism, is provided with the base 40 on the trolley body 30 as the base end, and a lift deck 42 is held at the tip of this telescopic boom 41. As shown in Figure 1, the telescopic boom 41 can be raised and lowered vertically with the base end as the pivot point by hydraulic cylinders 41A and 41B, and can also swing horizontally by hydraulic cylinders (not shown). The lift deck 42 is connected via a connecting part 43 and is supported so as to be able to swing vertically by a hydraulic cylinder 44.

[0035] The aforementioned erector device 3 is equipment for erecting steel shoring in a predetermined position, and as shown in Figures 1 and 2, two units are provided in a pair on the left and right sides of the front of the trolley body 30, with the center in between. Most of the steel shoring is connected at the top to form a single arch member, and the erector device 3A located on the right side lifts the right-side segmented steel shoring facing the tunnel face and sets it in the predetermined position, while the erector device 3B located on the left side lifts the left-side segmented steel shoring and sets it in the predetermined position. For the connection work at the top, a worker gets into the bucket device 4 and performs the bolt connection work close to the connection point.

[0036] As shown in Figures 1 and 2, the spraying operation using the spraying machine 1 involves positioning the spraying machine 1 at the spraying site near the tunnel face, and then determining the position coordinates and orientation of the spraying machine 1 by measurement. All coordinate data, such as the coordinate data of the tunnel shape and the measured spraying shape line data, is input into the controller, and it is necessary to first understand the coordinate state of the spraying machine 1 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.

[0037] Specifically, a total station for measurement is installed inside the tunnel, and at least two reference points (not shown) are pre-installed inside the tunnel. Based on the distance and angle measurement data obtained by sighting the two reference points with the total station, the installation coordinates of the total station are determined by the resection method. The position coordinates of this total station are checked at appropriate time intervals to ensure that no positional deviations have occurred.

[0038] Furthermore, at least two sighting targets are installed at the rear of the spraying machine 1. By installing these two sighting targets horizontally separated and at different heights vertically, it becomes possible to determine the installation coordinates of the spraying machine 1, as well as its attitude (roll angle, pitch angle, yaw angle), by sighting these targets with the total station. Alternatively, the position and attitude of the spraying machine 1 may be determined by installing one sighting target at the rear of the spraying machine 1 and attaching a 3-axis angle sensor to the machine body, acquiring coordinates using the sighting target, and determining the attitude using the 3-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 spraying machine 1, and a sighting target (LED marker) can be installed on the spray nozzle 27. By continuously measuring the coordinates of the sighting target using the motion cameras, the position of the spray nozzle 27 can be determined, and it can be moved at a predetermined speed along a planned movement line.

[0040] In this invention, "spraying" includes not only general concrete spraying but also various materials such as mortar spraying. Furthermore, it is desirable to set the distance from the spraying nozzle 27 to the spraying surface to the optimal position that minimizes the rebound rate.

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

[0042] As shown in Figure 4, the spray nozzle device 5 is equipped with a base plate 7 for mounting distance measuring devices 6, 6... at the base end of the spray nozzle 27, and multiple distance measuring devices 6, 6... are installed on the upper surface of the base plate 7 at appropriate intervals in the circumferential direction, and a cylindrical member 8 is provided in the center of the base plate 7 for mounting the spray nozzle 27 in a penetrating state. A bearing 9 with an inner ring 9A fixed to it is provided at the upper position of the cylindrical member 8, and a disc-shaped covering plate 10 is provided which is rotatably supported by being indirectly or directly connected to the outer ring 9B of the bearing 9, covers the plurality of distance measuring devices 6, 6... and is made of a material that transmits radio waves from the distance measuring devices 6, 6..., and a rotating means 11 is provided for rotating the covering plate 10 around its central axis.

[0043] The following will provide further details based on the same drawing.

[0044] The spray nozzle device 5 is equipped with a base plate 7 at the base end of the spray nozzle 27 for mounting distance measuring instruments 6, 6... The base plate 7 is a member that serves as a base for mounting the distance measuring instruments 6, 6... and is preferably made of steel. As shown in the figure, it is circular in plan view and is reinforced by forming a hanging piece 7a around its periphery.

[0045] In this embodiment, the distance measuring device 6 is arranged on the upper surface (nozzle tip side) of the base plate 7, with six distance measuring devices 6, 6… positioned at equal intervals in the circumferential direction around the spray nozzle 27. Therefore, even if the spray nozzle 27 is controlled to move in any direction, at least two distance measuring devices 6, 6 will be present on the front side in the direction of movement, and at least two distance measuring devices will be present on the rear side in the direction of movement. The distance before spraying is measured by the distance measuring devices 6, 6 located on the front side in the direction of movement, and the distance after spraying is measured by the distance measuring devices 6, 6 located on the rear side in the direction of movement, and the spraying thickness is calculated from the difference between these two values. In other words, it is possible to grasp the spraying thickness in real time during the process of spraying while moving the spray nozzle 27 along the tunnel wall at an arbitrary distance from the excavation wall. It is desirable to use a distance measuring device 6 in which the radar body is covered by a bulb-shaped shade for dust and fouling prevention, and the controller is built into the base. Each distance measuring device 6 is fixed to the base plate 7 by screwing it in.

[0046] Any distance meter can be used as the distance measuring instrument 6, such as an optical distance meter, laser distance meter, ultrasonic distance meter, or radar distance meter. However, optical distance meters and laser distance meters may not be able to measure properly due to noise caused by dust and rebound. Therefore, it is desirable to use a radar distance meter that uses short-wavelength microwaves or millimeter waves, which are more resistant to noise from environmental factors. Furthermore, using short-wavelength microwaves or millimeter waves can also improve measurement accuracy.

[0047] Regarding the number of distance measuring devices 6 installed, since the spraying basically moves alternately in a clockwise and counterclockwise direction in the circumferential direction of the tunnel, the distance measuring devices 6 must be positioned at least at a location in front of the spraying nozzle 27 in the direction of movement and at a location in rear of the spraying nozzle 27 in the direction of movement. Therefore, the minimum number of distance measuring devices 6 to be installed is two, but it is desirable to install them at least four or more locations, including positions in front of and behind the spraying nozzle in the circumferential direction of the tunnel, and positions in front of and behind the spraying nozzle in the direction of the tunnel.

[0048] The base plate 7 has multiple air vents 7b, 7b, etc. formed in appropriate locations other than where the distance measuring devices 6, 6... are installed, in order to exhaust air from the air nozzles 15, which will be described later.

[0049] The base plate 7 is provided with a cylindrical member 8 in the center for installing the spray nozzle 27 in a penetrating state. A bearing with a fixed inner ring is provided at the upper side of the cylindrical member 8. In the illustrated example, a flange 8a is provided on the upper part of the cylindrical member 8, and the bearing 9 is installed using this flange 8a as a base. The inner ring 9A of the bearing 9 is fixed to the cylindrical member 8 side, and a ring-shaped impeller 12 is coaxially fixed to the outer ring of the bearing 9 directly or indirectly, in the illustrated example, indirectly via an outer ring side member 9B fixed to the outer ring of the bearing 9. As shown in detail in Figure 5, the impeller 12 is a member having a structure in which vane plates 12C, 12C… are arranged radially at predetermined intervals in the circumferential direction between an annular upper plate 12A and an annular lower plate 12B, and the inner circumferential surface is closed by an inner circumferential wall 12D. The inner circumferential wall 12D is formed so that the nozzle through hole made by the cylindrical member 8 is continuous. This impeller 12 is a component of the rotating mechanism 11, which will be described later.

[0050] The covering plate 10 is fixed to the upper surface of the impeller 12. This covering plate 10 is a disc-shaped member formed of a material that covers the plurality of distance measuring devices 6, 6... and transmits radio waves from the distance measuring devices 6, 6....

[0051] The covering plate 10 has a hollow portion 10a such that the nozzle through-holes formed by the cylindrical member 8 are continuous. The covering plate 10 and impeller 12 are placed on the upper surface of the impeller 12, and an annular retaining plate 13 is installed on the upper surface of the impeller 12. The covering plate 10 and impeller 12 are inserted through the covering plate 10 and impeller 12 at appropriate intervals in the circumferential direction, and are fixed to the outer ring side member 9B of the bearing 9 by fixing bolts 14, 14... connected to the outer ring side member of the bearing 9. They are supported so as to be rotatable around the central axis, and are operated and controlled by the rotating means 11 so as to rotate in a constant direction at all times, at least during spraying operations.

[0052] The rotating means 11 consists of an impeller 12 connected to the outer ring side member 9B of the bearing 9, and one or more air nozzles 15 that inject gas onto the impeller 12 to rotate it. As shown in Figure 4(A), a total of three air nozzles 15 are arranged around the impeller 12 at 120° intervals, and by injecting gas onto the vane plate 12C of the impeller 12, the covering plate 10 is rotated together with the impeller 12 around its central axis. The rotating means 11 can also be other than, for example, a rotating mechanism driven by an electric motor. In this embodiment, the covering plate 10, impeller 12, and bearing 9 are arranged in that order from the tip side of the spray nozzle 27, but it is also possible to place the impeller 12 below the bearing 9 and arrange the covering plate 10, bearing 10, and impeller 12 in that order from the tip side of the spray nozzle 27.

[0053] The covering plate 10 can be formed using, for example, resin, foamed resin, or foamed resin composite material to allow radio waves from the distance measuring instrument 6 to pass through. Among these, foamed resin or foamed resin composite material, which does not easily obstruct the transmission of electromagnetic waves, is preferably used. The foamed resin composite material has a structure in which foamed resin is sandwiched between other materials, such as a lubricant coating layer such as a hardened paint film or a fluorine coating layer, and has a structure that makes it difficult for sprayed concrete to adhere to the surface. Metallic materials are not preferred because they obstruct the transmission of electromagnetic waves.

[0054] A peripheral wall 16 is provided in the space between the base plate 7 and the covering plate 10, extending circumferentially from the periphery of the base plate 7. In other words, if rebounded sprayed concrete directly adheres to the distance measuring instrument 6, it cannot be removed, so it is desirable to surround the space between the base plate 7 and the covering plate 10 with a peripheral wall 16 to prevent this. It is preferable to use a steel plate for the peripheral wall 16.

[0055] To attach the aforementioned spray nozzle device 5 to the base end of the spray nozzle 27, for example, a pair of mounting brackets 17, 17 are attached to the lower surface of the base plate 7, and then fastened and secured to the fixing member 48 extending from the nozzle holding part with bolts and nuts 49.

[0056] [Example of second form] Next, the spray nozzle device 5A relating to the second embodiment will be described in detail based on Figure 6.

[0057] In this embodiment, cleaning water spray nozzles 18, 18 are provided to remove concrete adhering to the outer surface of the covering plate 10.

[0058] As shown in Figure 6, two cleaning water spray nozzles 18, 18 are arranged above the covering plate 10, on one side of the covering plate 10. The cleaning water supply pipe can be fixed using the peripheral wall 16 or the like as a support. Since the covering plate 10 rotates, it is desirable to install the spray nozzles 18 in a number of two to three, preferably along the radial direction from the center.

[0059] By supplying cleaning water to the upper surface of the covering plate 10, the adhering concrete becomes easier to move and is thoroughly washed away, thereby further improving the concrete removal effect.

[0060] [Example of the third form] Next, the spray nozzle device 5B relating to the third embodiment will be described in detail based on Figure 7.

[0061] This embodiment includes a scraper 19 for scraping off concrete adhering to the outer surface of the covering plate. It also incorporates the aforementioned cleaning water spray nozzles 18, 18.

[0062] Since the scraper 19 will be subjected to a certain amount of load when scraping concrete, it is necessary to reinforce it so that it can withstand this load. In the illustrated example, first support columns 51, 51... are erected at appropriate intervals along the circumferential direction on the periphery of the base plate 7, and a ring-shaped member 52 is arranged concentrically on the lower side of the covering plate 10, slightly separated from it, and the upper ends of the support columns 51, 51... are connected. Horizontal protruding pieces 53, 53... are provided so as to protrude outward from multiple locations on the periphery of the ring-shaped member 52. In the illustrated example, a total of three horizontal protruding pieces 53 are provided at 120° intervals.

[0063] Using the horizontal projection piece 53 as a support base, three second support columns 54, 54... are erected, and horizontal support members 55 are provided in the direction from the upper ends of these second support columns 54, 54... toward the center, and the other ends of the three horizontal support members 55, 55... are connected to an annular member 56 positioned at the center. A scraper 51 is provided on one of the horizontal support members 55. In this embodiment, a brush-shaped scraper 51 is used, but a plate-shaped scraper can also be used.

[0064] In this embodiment, the concrete can be diluted by installing the cleaning water spray nozzles 18, 18 together, which improves the scraping effect of the scraper 19. However, the cleaning water spray nozzles 18 may be omitted, and the scraper 19 may be provided alone.

[0065] [Other examples of forms] (1) In this embodiment, a spraying machine 1 has been described in which a spraying nozzle 27 is held at the tip of a multi-joint boom that can be controlled to move along the tunnel wall at an arbitrary distance from the excavation wall. However, the same can be applied to a spraying nozzle device that is mounted on a circumferential rail that is arranged along the circumferential direction at a substantially constant distance inside the excavation cross section and is movable along the circumferential rail.

[0066] (2) In this embodiment, bearings are used as the rotational support mechanism, but it is also possible to support the covering plate 10 so that it can rotate freely by, for example, a roller mechanism. [Explanation of symbols]

[0067] 1...Spraying machine, 2...Spraying device, 3...Erector device, 4...Basket device, 5...Spray nozzle device, 6...Distance measuring instrument, 7...Base plate, 8...Cylindrical member, 9...Bearing, 9A...Inner ring, 9B...Outer ring side member, 10...Covering plate, 11...Rotating means, 12...Impeller, 13...Pressing plate, 14...Bolt, 15...Air nozzle, 16...Peripheral wall, 17...Mounting bracket, 18...Cleaning water spray nozzle, 19...Scraper, 27...Spray nozzle

Claims

1. In a spray nozzle device equipped with a distance measuring instrument for measuring the distance to the tunnel wall, The base end of the spray nozzle is equipped with a base plate for mounting a distance measuring device. Multiple distance measuring devices are installed on the upper surface of the base plate at appropriate intervals in the circumferential direction, and a cylindrical member is provided in the center of the base plate for installing the spray nozzle in a penetrating state. A bearing with a fixed inner ring is provided at the upper position of the cylindrical member, and a disc-shaped covering plate is provided which is rotatably supported around a central axis by being indirectly or directly connected to the outer ring of the bearing, covers the plurality of distance measuring devices, and is made of a material that transmits radio waves from the distance measuring devices. A spray nozzle device equipped with a distance measuring instrument, characterized by having a rotating means for rotating the covering plate.

2. The spray nozzle device according to claim 1, comprising a distance measuring instrument, wherein the rotating means comprises a ring-shaped impeller indirectly or directly connected to the outer ring of the bearing, and one or more air nozzles that inject gas onto the impeller to rotate it.

3. The spray nozzle device equipped with a distance measuring instrument according to claim 1 or 2, wherein the covering plate is formed of resin, foamed resin, or foamed resin composite material.

4. A spray nozzle device equipped with a distance measuring instrument according to any one of claims 1 to 3, wherein a peripheral wall is provided that surrounds the space between the base plate and the covering plate in the circumferential direction.

5. A spray nozzle device equipped with a distance measuring instrument according to any one of claims 1 to 4, wherein a cleaning water spray nozzle for removing concrete adhering to the outer surface of the covering plate is provided.

6. A spray nozzle device equipped with a distance measuring instrument according to any one of claims 1 to 5, wherein a scraper is provided for scraping off concrete adhering to the outer surface of the covering plate.

7. A spray nozzle device equipped with a distance measuring instrument according to any one of claims 1 to 6, wherein a radar rangefinder is used as the distance measuring instrument.

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