Spray nozzle device equipped with distance measuring device

Abstract

To improve measurement accuracy by accurately capturing reflected waves from a tunnel wall surface even when a radar range finder is used as a distance measuring device in a spray nozzle device equipped with a distance measuring device for measuring the distance to the tunnel wall surface.SOLUTION: In a spray nozzle device 5 comprising a base plate 7 arranged perpendicular to the spray direction at a base end of the spray nozzle 27, a plurality of distance measuring devices 6 are mounted on the base plate 7 at appropriate intervals around the circumference, a circular covering plate 10 made of a material that transmits radio waves from the distance measuring devices 6 is mounted at a distance from the base plate 7 and is rotatable around its central axis to cover the plurality of distance measuring devices 6, and rotation means 11 is provided for rotating the covering plate 10. A radar range finder is used as the distance measuring device 6, and the radar range finder 6 is positioned at an angle so that the radio waves from the radar range finder 6 are incident at an angle oblique to the covering plate 10.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 7, which has a movable crawler-type, tire-type, or rail-type mobile carriage 60 to which a boom 61 holding a spray nozzle is attached, 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] In Patent Document 1 listed below, the present inventors have also proposed a tunnel spraying control method for tunnels, targeting the wall surface of a tunnel excavated using the NATM construction method, in which spraying is performed using a spraying machine that holds a spray nozzle at the tip of a multi-jointed boom that can be controlled to move along the tunnel wall surface at an arbitrary distance from the excavated wall surface.A distance measuring device is disposed to measure the distance to the tunnel wall surface, and as the spray nozzle is moved 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 spraying to measure the spray thickness resulting from the spraying.A proportional relationship between the moving speed of the spray nozzle and the spray thickness is obtained, and under conditions in which there are unevenness in the tunnel excavated wall surface, the spray nozzle is moved while keeping the pressure-fed amount of spray material constant, and based on the proportional relationship, movement control is performed to relatively slow the moving speed in concave parts and speed up the moving speed in convex parts in the early stages of spraying to smooth the sprayed surface.

[0007] Furthermore, Patent Document 2 proposes a spray nozzle device equipped with a distance measuring device that measures the distance to the tunnel wall surface, which includes a base plate for installing the distance measuring device at the base end of the spray nozzle, multiple distance measuring devices installed at appropriate intervals circumferentially on the upper surface of this base plate, a circular covering plate formed from a material that is transparent to radio waves from the distance measuring devices and spaced apart from the base plate to cover the multiple distance measuring devices, and is installed rotatably around its central axis, and is equipped with a rotating means for rotating the covering plate, and is also equipped with a cleaning water spray nozzle for removing concrete adhering to the outer surface of the covering plate and a distance measuring device equipped with a scraper for scraping off the concrete adhering to the outer surface of the covering plate. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2019-167678 [Patent Document 2] Japanese Patent Application Publication No. 2023-137318 Summary of the Invention [Problem to be solved by the invention]

[0009] The spray nozzle device described above uses a radar rangefinder that uses short-wavelength microwaves or millimeter waves as the distance measuring device because it is resistant to environmental factors such as dust. However, it has become clear that radar waves themselves are more susceptible to the influence of a covering plate than other radio waves. That is, when a covering plate is placed perpendicular to the radio waves emitted from the radar rangefinder, reflections from the covering plate occur, and periodic echoes are generated between the covering plate and the radar rangefinder. These echoes overlap with the waves reflected from the wall surface being sprayed, making it difficult to clearly identify only the waves reflected from the wall surface, resulting in measurement errors.

[0010] Therefore, the main objective of the present invention is to improve measurement accuracy in a spray nozzle device equipped with a distance measuring device that measures the distance to a tunnel wall by accurately capturing reflected waves from the spray wall even when a radar range finder is used as the distance measuring device. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention according to claim 1 provides a spray nozzle device comprising a base plate disposed at the base end of the spray nozzle perpendicular to the spray direction, a plurality of distance measuring devices for measuring the distance to the tunnel wall surface installed at appropriate intervals around the circumferential direction of the base plate, a disk-shaped covering plate formed of a material that transmits radio waves from the distance measuring devices and installed rotatably around a central axis at a distance from the base plate to cover the plurality of distance measuring devices, and a rotating means for rotating the covering plate, A spray nozzle device equipped with a distance measuring device is provided, characterized in that a radar distance measuring device is used as the distance measuring device, and the radar distance measuring device is tilted and positioned so that the radio waves from the radar distance measuring device are at an oblique angle of incidence with respect to the covering plate.

[0012] In the invention described in claim 1, the base end of the spray nozzle is provided with a base plate arranged perpendicular to the spraying direction, and a plurality of distance measuring devices for measuring the distance to the tunnel wall surface are installed on the upper surface of this base plate at appropriate intervals in the circumferential direction. A circular covering plate made of a material that transmits radio waves from the distance measuring devices is installed rotatably around its central axis at a distance from the base plate to cover the plurality of distance measuring devices, and a rotating means for rotating the covering plate is provided. In particular, a radar range finder is used as the distance measuring device, and the radar range finder is arranged at an angle so that the radio waves from the radar range finder are incident at an oblique angle with respect to the covering plate.

[0013] Most of the radio waves emitted from the radar range finder pass through the coated plate, but some of them are reflected by the coated plate. In this spray nozzle device, the radar range finder is tilted, so the radio waves from the radar range finder are incident at an angle to the coated plate, and the reflected waves are not directly captured by the radar range finder. This significantly reduces the effect of echoes from the coated plate, and the reflected waves from the spray surface can be clearly detected with a large advantage, thereby improving measurement accuracy.

[0014] According to a second aspect of the present invention, there is provided a spray nozzle device equipped with a distance measuring instrument as set forth in the first aspect, wherein the radar distance meter is arranged so that the incident angle of the radio waves to the covering plate is 3 to 10 degrees.

[0015] The invention described in claim 2 specifically defines the angle of incidence of radio waves to the covering plate of the radar range finder, in other words, the installation tilt angle. Experiments have shown that by tilting the angle of incidence of radio waves to the covering plate by 3 to 10 degrees, preferably 4 to 6 degrees, it is possible to almost completely eliminate the influence of echoes from the covering plate.

[0016] According to a third aspect of the present invention, there is provided a spray nozzle device equipped with a distance measuring device as set forth in the first aspect, wherein the covering plate is formed from a resin, a foamed resin, or a foamed resin composite material.

[0017] The invention described in claim 3 above shows a preferred embodiment of the covering plate. Specifically, resin, foamed resin, or a foamed resin composite material formed by combining foamed resin with another material can be preferably used. Metallic materials are not preferred because they hinder the transmission of electromagnetic waves.

[0018] The present invention according to claim 4 provides a spray nozzle device equipped with a distance measuring device according to claim 1, which is provided with a cleaning water spray nozzle for removing concrete adhering to the outer surface of the covering plate.

[0019] The invention described in claim 4 is provided with a cleaning water injection nozzle for removing concrete adhering to the outer surface of the covering plate. By injecting cleaning water, the adhering shotcrete can also be washed away and removed, thereby preventing concrete from adhering to the upper surface of the covering plate.

[0020] The present invention according to claim 5 provides a spray nozzle device equipped with a distance measuring device as described in claim 1, which is provided with a cleaning water spray nozzle for removing concrete adhering to the outer surface of the covering plate, as well as a scraper for scraping off concrete adhering to the outer surface of the covering plate.

[0021] The invention described in claim 5 is provided with a scraper for scraping off concrete adhering to the outer surface of the covering plate, in addition to a cleaning water injection nozzle for removing concrete adhering to the outer surface of the covering plate. By providing a scraper for scraping off concrete adhering to the covering plate, it is possible to reliably remove the concrete even if the concrete is strongly adhered. [Effects of the Invention]

[0022] As explained above, according to the present invention, in a spray nozzle device equipped with a distance measuring device that measures the distance to the tunnel wall, even when a radar range finder is used as the distance measuring device, it is possible to accurately capture reflected waves from the spray wall surface, thereby improving measurement accuracy. [Brief explanation of the drawings]

[0023] [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] 1 shows a spray nozzle device 5, in which (A) is a plan view and (B) is a cross-sectional view (view taken along the arrow BB). [Figure 5] FIG. 5 is a cross-sectional view taken along line VV of FIG. [Figure 6] FIG. 2 is a perspective view showing the structure of an impeller 12. [Figure 7] FIG. 2 is a side view showing the spraying procedure using the spraying machine 60. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0025] [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.

[0026] 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) that has a bogie body 30 that is self-propelled by crawlers 31 driven by a power source, and is equipped with a spraying device 2, an erector device 3, and a basket device 4. This spraying machine 1 is used for primary spraying work, erection work of steel shoring, and secondary spraying work.

[0027] As shown in detail in Figure 3, the spraying device 2 is provided at a position in the center of the front of the carriage body 30. A first arm 21 is pivotally supported on a base 20 on the carriage body 30 side so as to be swingable about a horizontal shaft 20a, and is adapted to swing in the elevation direction by the 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.

[0028] 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, around the first arm 21, second arm 22 and third arm 23, a cover material 28 that can expand and contract in conjunction with the extension and retraction of the arms is provided to prevent rebound shotcrete from adhering to the arms and making them unable to extend and retract.

[0029] 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.

[0030] 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 30. A telescopic boom 41, which is extendable and retractable by a telescopic mechanism, is provided with a base 40 on the carriage body 30 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.

[0031] The erector devices 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 30. Most of the steel shoring is connected at the top end to form a single arch member, and the erector device 3A located on the right lifts and sets in the predetermined position the separate steel shoring on the right side facing the face, and the erector device 3B located on the left side lifts and sets in the predetermined position the separate steel shoring on the left side. For connection work at the top end, a worker gets into the bucket device 4 and performs bolt connection work close to the connection part.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In addition, the term "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.

[0037] [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.

[0038] As shown in Fig. 4, the spray nozzle device 5 includes a base plate 7 disposed perpendicular to the spray direction at the base end of the spray nozzle 27, a plurality of distance measuring devices 6, 6... for measuring the distance to the tunnel wall surface, mounted on the upper surface of the base plate 7 at appropriate intervals in the circumferential direction, and a circular covering plate 10 formed of a material that transmits radio waves from the distance measuring devices 6, 6... and rotatably installed around its central axis at a distance from the base plate 7 to cover the distance measuring devices 6, 6..., and equipped with a rotation means 11 for rotating the covering plate 10. In this spray nozzle device, radar range finders 6 are used as the distance measuring devices 6, 6..., and the radar range finders 6 are tilted so that the radio waves from the radar range finders 6 are incident at an oblique angle relative to the covering plate 10. While dust and rebound can cause noise that makes measurements impossible with optical range finders and laser range finders, the use of radar range finders 6 that use short-wavelength microwaves or millimeter waves has the advantage of being less susceptible to environmental factors. In addition, the use of microwaves and millimeter waves with short wavelengths will also improve measurement accuracy.

[0039] This will be described in more detail below.

[0040] The spray nozzle device 5 is provided with a base plate 7 at the base end of the spray nozzle 27, on which the radar range finders 6, 6... are to be installed, with a surface perpendicular to the spray direction (the direction of the spray nozzle 27). The base plate 7 is a member that serves as a base for installing the radar range finders 6, 6..., and is preferably made of steel. As shown in the figure, the base plate 7 is circular in plan view, with a hanging piece 7a formed on the periphery for reinforcement, and multiple air vent holes 7b, 7b... are formed in places other than where the radar range finders 6, 6... are installed, for discharging air from an air nozzle 15, which will be described later.

[0041] In this embodiment, six radar rangefinders 6 are arranged at equal intervals around the spray nozzle 27 on the upper surface (the surface toward the nozzle tip) of the base plate 7. Therefore, even if the spray nozzle 27 is controlled to move in any direction, at least two radar rangefinders 6, 6 are located in front of the movement direction and at least two radar rangefinders 6, 6 are located behind the movement direction. The radar rangefinders 6, 6 located in front of the movement direction measure the distance before spraying, and the radar rangefinders 6, 6 located behind the movement direction measure the distance after spraying, and the spray thickness is calculated from the difference between these two. In other words, during the spraying process while moving the spray nozzle 27 along the excavated wall surface at an arbitrary distance from the excavated wall surface, the spray thickness due to the spraying can be grasped in real time. It is desirable to use the radar rangefinders 6 in which the radar body is covered with a bulb-shaped shade to protect it from dust and dirt, and a controller is built into the base. Each radar rangefinder 6 is fixed to the base plate 7 by a fixing bracket 17 having a deformed U-shaped cross section.

[0042] All of the arranged radar range finders 6, 6... are arranged at an inclination angle θ radially outward about the spray direction axis P, which is the center line of the spray nozzle 27, so that the radio waves from the radar range finders 6 are incident at an inclined angle relative to the covering plate 10. As will be described later, the covering plate 10 is arranged perpendicular to the spray direction, so the inclination angle θ is the angle of incidence of the radio waves relative to the covering plate 10. The inclination angle θ is desirably 3 to 10°, and preferably 4 to 6°.

[0043] As shown in Figure 5, most of the radio waves emitted from the radar range finder 6 pass through the covering plate 10, but a small portion of them is reflected by the covering plate 10. Because the radio waves from the radar range finder 6 are incident at an angle to the covering plate 10, the reflected waves are not directly captured by the radar range finder 6. This significantly reduces the effect of the echo from the covering plate 10, and the reflected waves from the sprayed surface can be clearly detected with priority, improving measurement accuracy.

[0044] Regarding the number of radar rangefinders 6 to be installed, because the spray nozzle 27 basically moves alternately clockwise and counterclockwise around the tunnel, the radar rangefinders 6 must be installed at least at a position in front of and a position behind the movement direction of the spray nozzle 27. Therefore, although the minimum number of radar rangefinders 6 to be installed is two, it is desirable to install them in at least four or more locations, including positions in front of and behind the spray nozzle in the tunnel circumferential direction, and positions in front of and behind the spray nozzle in the tunnel direction.

[0045] The base plate 7 is provided at its center with a cylindrical member 8 for installing the spray nozzle 27 in a penetrating state. A bearing 9 with an inner ring fixed thereto is provided at the upper side of the cylindrical member 8. In the illustrated example, a flange 8a is provided at the top of the cylindrical member 8, and the bearing 9 is mounted on this flange 8a. The inner ring 9A of the bearing 9 is fixed to the cylindrical member 8, and a ring-shaped impeller 12 is coaxially fixed to the outer ring of the bearing 9 directly or indirectly, or indirectly via an outer ring-side member 9B fixed to the outer ring of the bearing 9 in the illustrated example. As shown in detail in FIG. 6 , the impeller 12 is configured such that 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-holes formed by the cylindrical member 8 are continuous. This impeller 12 is a member that constitutes the rotating means 11 described later.

[0046] The covering plate 10 is fixed to the upper surface of the impeller 12. The covering plate 10 is a disk-shaped member that covers the radar range finders 6, 6, ... and is made of a material that transmits radio waves from the radar range finders 6, 6, ..., and is disposed perpendicular to the spray direction. Therefore, the covering plate 10 is disposed parallel to the base plate 7 with a gap therebetween.

[0047] The covering plate 10 can be formed using, for example, a resin plate, a foamed resin, or a foamed resin composite to allow radio waves from the radar rangefinder 6 to pass through. Among these, a resin plate is preferable. While the material is not particularly limited, engineering plastics such as polyphenylene sulfide (PPS) and polybutylene terephthalate (PBT) are suitable. These resins have excellent impact resistance, heat resistance, chemical resistance, and electrical properties. Furthermore, radar has been known to absorb radio waves when passing through materials containing moisture, resulting in a decrease in radio wave transmittance. However, the use of the aforementioned engineering plastics allows radio wave transmittance to be maintained due to their low water absorption. It is desirable to apply a lubricant-based coating layer, such as a hardened paint film or a fluorine coating layer, to the surface of the covering plate 10 to prevent the adhesion of sprayed concrete. It is not preferable to use a metal-based material for the covering material 10 because it inhibits electromagnetic wave transmission.

[0048] The covering plate 10 has a hollow portion 10a formed therein so as to be continuous with the nozzle through-holes formed by the cylindrical member 8. The covering plate 10 is placed on the upper surface of the impeller 12, and an annular presser plate 13 is further installed on the upper surface of the presser plate 13. The covering plate 10 and impeller 12 are inserted at appropriate intervals in the circumferential direction, and the covering plate 10 and impeller 12 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, and are supported rotatably about the central axis, and are controlled by a rotating means 11 so as to always rotate in a fixed direction at least during the spraying operation.

[0049] The rotating means 11 is composed of the impeller 12 connected to the outer ring side member 9B of the bearing 9 and one or more air nozzles 15 that inject gas into the impeller 12 to rotate it. As shown in FIG. 4(A), a total of four air nozzles 15 are arranged around the periphery of the impeller 12, and by injecting gas into the vane plates 12C of the impeller 12, the covering plate 10 together with the impeller 12 is rotated about the central axis. Note that the rotating means 11 can also be, for example, a rotation mechanism using an electric motor as a drive source. In addition, in this embodiment, the covering plate 10, impeller 12, and bearing 9 are arranged in this order from the tip side of the spray nozzle 27. However, it is also possible to arrange the impeller 12 below the bearing 9 and arrange the covering plate 10, bearing 10, and impeller 12 in this order from the tip side of the spray nozzle 27.

[0050] The periphery of the space between the base plate 7 and the covering plate 10 may be left open to the outside, but it is desirable to provide a peripheral wall 16 surrounding the periphery continuously from the periphery of the base plate 7. That is, if rebound shotcrete adheres directly to the radar rangefinder 6, it cannot be removed, so it is desirable to provide the peripheral wall 16 to prevent adhesion. Although a steel plate can be used as the peripheral wall 16, as shown in FIG. 5, it is desirable to construct it from a radar-permeable material, such as a resin or sheet material, so that the radio waves transmitted from the radar rangefinder 6 are reflected several times within the space between the covering plate 10 and the base plate 7 and then released to the outside.

[0051] In this embodiment, in particular, cleaning water spray nozzles 18, 18 are provided for removing concrete adhering to the outer surface of the covering plate 10, and a scraper 19 is provided for scraping off concrete adhering to the outer surface of the covering plate 10.

[0052] As support members for supporting the cleaning water spray nozzles 18 and scrapers 19, support columns 54 are erected at appropriate intervals around the periphery of the base plate 7, and horizontal support members 55 are provided in a direction from the upper ends of these support columns 54 toward the center, with the other ends of the four horizontal support members 55 connected to an annular member 56 located at the center. A scraper 19 is provided for one of the horizontal support members 55. In this embodiment, a brush-shaped scraper 19 is used as the scraper 19, but a plate-shaped scraper can also be used.

[0053] Two cleaning water jet nozzles 18, 18 are provided for another one of the horizontal support members 55, 55.... The cleaning water supply pipe can be fixed to the peripheral wall 16 or the like as a support. As the covering plate 10 rotates, it is desirable to arrange about 2 to 3 nozzles at appropriate intervals in the radial direction from the center.

[0054] By supplying cleaning water to the upper surface of the covering plate 10, the adhering concrete becomes easier to move and can be washed away cleanly, and the concrete removal effect can be further improved by providing a scraper 19. In this embodiment, the scraper 19 and the cleaning water injection nozzles 18, 18 are provided together, but it is also possible to provide only one of them.

[0055] To attach the spray nozzle device 5 to the base end of the spray nozzle 27, for example, a pair of mounting brackets 57, 57 are attached to the underside of the base plate 7, and then fastened to a fixing member 58 extending from the nozzle holding portion with bolts and nuts 59.

[0056] [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. (2) In this embodiment, the bearing 9 is used as a rotation support mechanism, but it is also possible to rotatably support the cover plate 10 using, for example, a roller mechanism. [Explanation of symbols]

[0057] 1...spraying machine, 2...spraying device, 3...erector device, 4...basket device, 5...spraying nozzle device, 6...distance measuring device (radar range finder), 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...circumferential wall, 17...mounting bracket, 18...cleaning water spray nozzle, 19...scraper, 27...spraying nozzle

Claims

1. A spray nozzle device comprising a base plate disposed at the base end of the spray nozzle perpendicular to the spray direction, a plurality of distance measuring devices for measuring the distance to the tunnel wall surface, which are installed at appropriate intervals around the circumferential direction of the base plate, a disk-shaped covering plate formed of a material that transmits radio waves from the distance measuring devices and installed rotatably around a central axis at a distance from the base plate to cover the plurality of distance measuring devices, and a rotating means for rotating the covering plate, A spray nozzle device equipped with a distance measuring device, characterized in that a radar distance measuring device is used as the distance measuring device, and the radar distance measuring device is tilted and positioned so that the radio waves from the radar distance measuring device are at an oblique angle of incidence with respect to the covering plate.

2. 2. A spray nozzle device equipped with a distance measuring device according to claim 1, wherein said radar distance meter is arranged so that the incident angle of the radio waves to the covering plate is 3 to 10 degrees.

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

4. 2. A spray nozzle device equipped with a distance measuring device according to claim 1, further comprising a cleaning water spray nozzle for removing concrete adhering to the outer surface of said covering plate.

5. 2. A spray nozzle device equipped with a distance measuring device as described in claim 1, which is provided with a cleaning water spray nozzle for removing concrete adhering to the outer surface of the covering plate, as well as a scraper for scraping off concrete adhering to the outer surface of the covering plate.

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