Positioning jig, retaining wall drilling device, and retaining wall drilling method

Abstract

To provide a retaining wall drilling device, a positioning jig, and a drilling method, which can easily align and install a drilling machine on a retaining wall and can reliably make a horizontal hole reach a predetermined position in the soil.SOLUTION: A retaining wall drilling device comprises a drilling machine 15 that drills a horizontal hole 12 from a retaining wall R into the ground G, an alignment jig 20 that aligns the drilling machine 15 in a predetermined direction relative to the retaining wall R so that the horizontal hole 12 reaches a predetermined position in the ground G, and an installation unit 17 that installs the drilling machine 15 in a fixed state facing the retaining wall R. The alignment jig 20 comprises an illumination device 23 that has a light source 23a that can emit a light beam and can illuminate multiple positions along the predetermined direction with the light beam from the light source 23a, and a support structure 18 that supports the illumination device 23 so that it can illuminate a drilling tool 19. The drilling machine 15 can be aligned so that multiple positions on the drilling tool 19 are illuminated by the light beam from the illumination device 23 supported by the support structure 18.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an alignment jig, and a retaining wall drilling device and a retaining wall drilling method that use this alignment jig. [Background technology]

[0002] In recent years, there has been an increasing need to reinforce various types of retaining walls, such as concrete and masonry walls, and various reinforcement methods have been proposed for this purpose. For example, Patent Document 1 proposes a slope reinforcement structure and construction method in which multiple horizontal holes are drilled from a slope, reinforcing material is inserted into each horizontal hole, and a filler material is filled in and fixed to form a reinforcement body, and vertical holes are drilled from the ground surface and connected to the multiple horizontal holes, and reinforcing material is inserted into the vertical holes, and a filler material is filled in and fixed to form a reinforcement body, connecting the reinforcing material in the multiple horizontal holes to the reinforcing material in the vertical holes.

[0003] In such reinforcement structures and reinforcement methods, it is necessary to ensure that the multiple horizontal holes and vertical holes are connected in the soil, and in particular, in order to connect the reinforcing materials inserted into the multiple horizontal holes with the reinforcing materials inserted into the vertical holes, it is desirable that there is as little misalignment as possible between the axes of the multiple horizontal holes and the axis of the vertical hole. As a construction procedure for forming a plurality of horizontal holes and vertical holes, a method is carried out in which a thick vertical hole is first formed and then a plurality of horizontal holes are drilled to penetrate the vertical hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-5847 Summary of the Invention [Problem to be solved by the invention]

[0005] However, to connect such a vertical hole and a horizontal hole underground, the second hole must be drilled correctly toward the first hole, but achieving an accurate connection has not been easy. Even if the drilling machine is placed in a predetermined position and the drilling direction is determined by eye, if the first hole is tilted more than expected, the holes may be misaligned and the connection may not be possible. Therefore, there was a problem in that it was very time-consuming to align and install the drilling device so that the holes could be connected underground.

[0006] Therefore, the present invention aims to provide a retaining wall drilling device and alignment jig that can easily align and install a drilling machine relative to a retaining wall and ensure that horizontal holes reach specified positions in the soil, as well as a retaining wall drilling method. [Means for solving the problem]

[0007] The retaining wall drilling device of the present invention, which solves the above-mentioned problems, is a retaining wall drilling device comprising: a drilling machine that drills horizontal holes from the retaining wall into the soil; an alignment jig for aligning the drilling machine by directing the drilling tool of the drilling machine in a predetermined direction relative to the retaining wall so that the horizontal holes reach a predetermined position in the soil; and an installation section for installing the drilling machine in a fixed state facing the retaining wall, wherein the alignment jig has a light source that emits a light beam and comprises an illumination device that irradiates multiple positions along a predetermined direction with the light beam from the light source, and a support structure that supports the illumination device so that it can illuminate the drilling tool, and is characterized in that the drilling machine can be aligned so that multiple positions on the drilling tool are illuminated by the light beam from the illumination device supported by the support structure.

[0008] According to the retaining wall drilling device of the present invention, when drilling a horizontal hole from the retaining wall to a predetermined position in the soil, the drilling machine can be aligned using an alignment jig. The alignment jig includes an illumination device supported by a support structure so as to be able to illuminate the drilling tool. The illumination device can illuminate a light beam at multiple positions along a predetermined direction that allows the drilling tool of the drilling machine to reach the predetermined position in the soil. Therefore, when installing the drilling machine on the retaining wall, simply by aligning the drilling machine so that multiple positions on the drilling tool are illuminated by the light beam from the light source of the illumination device, the drilling machine can be installed in alignment with the retaining wall with the drilling tool reliably positioned facing the predetermined position in the soil. Then, when a horizontal hole is drilled with this drilling tool, the horizontal hole can be drilled so that it always reaches the vertical hole. Therefore, it is possible to provide a retaining wall drilling device that can easily align and install the drilling machine relative to the retaining wall and can reliably make the horizontal hole reach a predetermined position in the soil.

[0009] In this retaining wall drilling device, a reference irradiated portion that can be irradiated with a light beam may be provided at a specific position that can identify a predetermined position. In this way, by providing a reference irradiated portion at a specific position in the soil that can identify a predetermined position, and installing an irradiation device so that this reference irradiated portion is irradiated with a light beam, it is possible to easily irradiate the light beam from the light source of the irradiation device to multiple positions along a predetermined direction. This makes it easy to install a positioning jig.

[0010] In this case, the reference irradiated portion may be provided on the support structure, and since the irradiation device and the reference irradiated portion to be irradiated with the light beam are present on the same support structure, the orientation of the irradiation device 23 can be easily adjusted.

[0011] In this retaining wall drilling device, the drilling machine drills a horizontal hole so that it reaches a vertical hole provided at a predetermined position, and preferably the support structure includes a vertical frame equipped with a reference irradiated portion and installed in the vertical hole, and a horizontal frame to which an irradiation device is attached, fixed to the vertical frame, and extending horizontally. By installing the vertical frame in the vertical hole, linear light from the irradiation device can be easily irradiated in a predetermined direction toward the vertical hole. Therefore, when drilling the horizontal hole, the position and orientation of the drilling machine can be easily aligned, and the horizontal hole can be reliably reached the vertical hole.

[0012] In this retaining wall drilling device, the irradiation device may be configured to emit laser light as a light beam from the light source in the radial direction to irradiate the irradiated area in a streak. In the alignment jig of the present invention, the irradiation device is configured to emit laser light as a light beam from the light source in the radial direction to irradiate the irradiated area in a streak. In this way, the irradiated area can be brightly illuminated with a clear streak of light beam, improving visibility during alignment.

[0013] In this retaining wall drilling device, the vertical hole may be made of a hollow pillar-shaped body arranged vertically in the ground, and the vertical frame may be inserted into and supported in the hollow portion of the hollow pillar-shaped body. The alignment jig can be configured to consist of a hollow columnar body with a vertical hole arranged vertically in the soil, and the vertical frame can be inserted into and supported by the hollow portion of the hollow columnar body. In this way, the shape of the hollow portion of the hollow columnar body into which the vertical frame is inserted and supported is stable, allowing the vertical frame to be stably positioned. This makes it easy to stabilize the alignment jig after installation in the vertical hole, and makes it less likely to tilt after installation. This allows for accurate light irradiation by the illumination device.

[0014] In this retaining wall drilling device, the vertical frame preferably has a rod-shaped vertical frame main body and centering parts that are arranged in at least two locations above and below the periphery of the vertical frame main body and abut against the inner surface of the hollow part to position the vertical frame main body near the center of the vertical hole. In this way, the vertical frame main body can be positioned near the center of the vertical hole by the centering parts, making it easier to drill horizontal holes that reach near the center of the vertical hole, and allowing the horizontal holes to be formed more accurately.

[0015] In this retaining wall drilling device, the vertical frame may be provided with a stopper portion that abuts against the upper end of the vertical hole from above, thereby holding the horizontal frame above the ground. By installing an alignment jig in a vertical hole that is longer than the vertical frame, it is possible to drill a horizontal hole in a deeper vertical hole. Furthermore, because unnecessary forces from the ground do not act on the horizontal frame, the irradiation device can be accurately positioned relative to the vertical frame, and the irradiation device can accurately irradiate light.

[0016] In this retaining wall drilling device, rod-shaped horizontal frames may be arranged and fixed in a direction intersecting the rod-shaped vertical frames, and the horizontal frames may be reinforced on both sides of the vertical frames so that they maintain an angle relative to the vertical frames. Since the horizontal frames are reinforced on both sides of the vertical frames so that they maintain an angle, the horizontal frames can be firmly fixed to the vertical frames, and the angle of the horizontal frames relative to the vertical frames can be maintained with precision as long as rigidity can be ensured. This allows the irradiation device to irradiate light with precision.

[0017] In this retaining wall drilling device, the irradiation device may be supported by the horizontal frames so that the light source is positioned directly below the horizontal frames, and the inclination of the irradiation device may be adjustable so that the light beam emitted from the light source in the radial direction irradiates the central axes of the vertical and horizontal frames. In this way, the irradiation device can be installed on the horizontal frames and adjusted with high precision, and the alignment jig is easy to use.

[0018] The alignment jig of the present invention, which solves the above-mentioned problems, is an alignment jig for aligning a drilling machine by orienting the drilling tool of the drilling machine that drills a horizontal hole in a predetermined direction relative to the retaining wall when drilling a horizontal hole so that the hole reaches a predetermined position in the ground from a retaining wall, and is characterized by comprising: a light source capable of emitting a light beam, an illumination device that can illuminate multiple positions along the predetermined direction with the light beam from the light source, and a support structure that supports the illumination device so that it can illuminate the drilling tool, and is characterized by aligning the drilling machine so that multiple positions on the drilling tool are illuminated by the light beam from the illumination device supported by the support structure.

[0019] The alignment jig of the present invention includes an illumination device supported by a support structure so as to be able to illuminate the drilling tool, and the illumination device can illuminate a light beam at a plurality of positions along a predetermined direction that allows the drilling tool of the drilling machine to reach a predetermined position in the soil. Therefore, when aligning the drilling machine with respect to the retaining wall, the drilling machine can be aligned with the retaining wall simply by aligning the drilling machine so that multiple positions on the drilling tool are illuminated by the light beam from the light source of the illumination device, with the drilling tool reliably positioned facing the specified position in the soil. Therefore, it is possible to provide an alignment jig that can easily align a drilling machine with respect to a retaining wall.

[0020] In addition, the alignment jig of the present invention is an alignment jig for aligning a drilling machine for drilling a horizontal hole relative to a retaining wall when drilling a horizontal hole in a vertical hole provided in the ground so that the hole reaches the vertical hole from the retaining wall, and comprises a vertical frame that can be inserted into the vertical hole, a horizontal frame that is fixed to the vertical frame and is perpendicular to the vertical frame, and an illumination device that is attached to the horizontal frame and can illuminate the drilling machine installed against the retaining wall, and the illumination device has a light source that can emit a light beam in an radial direction, and is attached to the horizontal frame so that the light beam from the light source can irradiate the vertical frame and the horizontal frame, and when the vertical frame is inserted into the vertical hole and the illumination device is positioned above the retaining wall, the illumination device may be configured to align the drilling machine so that the drilling axis of the drilling tool is illuminated by the light beam from the light source.

[0021] According to the alignment jig of the present invention, an illumination device capable of illuminating the drilling machine is attached to a horizontal frame perpendicular to the vertical frame. This illumination device has a light source capable of emitting a light beam in a radial direction, and the light beam from the light source forms a linear light streak at the irradiated portion. This illumination device is attached to the horizontal frame so that the light streak is formed on the vertical frame and the horizontal frame. The vertical frame of this alignment jig is inserted into the vertical hole, and the alignment jig is installed with the irradiation device positioned above the retaining wall. When a light beam is emitted from the light source, a light streak extending along the horizontal and vertical frames is formed at the irradiated area. Since the vertical frame is inserted into the vertical hole, the light streak always extends toward the vertical hole.

[0022] Therefore, by forming this light beam on the drilling tool of the drilling machine and aligning and fixing the drilling machine with respect to the retaining wall so that the drilling axis of the drilling tool coincides with the light beam, it is possible to position the drilling tool in the direction of the vertical hole without fail. Then, when a horizontal hole is drilled with this drilling tool, it is possible to drill the horizontal hole so that it always reaches the vertical hole. Therefore, when drilling a horizontal hole, the position and orientation of the drilling machine can be aligned very easily, and the horizontal hole can be reliably made to reach the vertical hole regardless of the position or orientation of the vertical hole in the soil that makes up the slope.

[0023] The retaining wall drilling method of the present invention, which solves the above-mentioned problems, is a method of drilling a retaining wall in which a horizontal hole is drilled using a drilling machine in a predetermined direction so that it reaches a predetermined position in the ground from the retaining wall, and is characterized by supporting an illumination device on a support structure so that the light beam emitted from the light source can irradiate multiple positions along the predetermined direction, aligning the drilling machine and installing it in a fixed state facing the retaining wall so that the drilling tool is irradiated at multiple positions by the light beam from the illumination device supported on the support structure, and drilling the horizontal hole using the drilling tool.

[0024] According to the retaining wall drilling method of the present invention, when drilling a horizontal hole from the retaining wall to a predetermined position in the soil, an illumination device supported on a support structure so as to be able to illuminate the drilling tool can illuminate a light beam at multiple positions along a predetermined direction that allows the drilling tool of the drilling machine to reach the predetermined position in the soil. Therefore, when installing the drilling machine on the retaining wall, simply by aligning the drilling machine so that multiple positions on the drilling tool are illuminated by the light beam from the light source of the illumination device, the drilling machine can be installed in alignment with the retaining wall with the drilling tool reliably positioned facing the predetermined position in the soil. Then, since the horizontal hole is drilled with this drilling tool, it is possible to drill the horizontal hole so that it always reaches the vertical hole. Therefore, it is possible to provide a method for drilling holes in a retaining wall that allows the drilling machine to be easily aligned and installed relative to the retaining wall and that ensures that the horizontal hole reaches a predetermined position in the soil.

[0025] In addition, the method for drilling holes in a retaining wall of the present invention is a method for drilling holes in a retaining wall in which a horizontal hole is drilled horizontally from the retaining wall to reach a vertical hole provided vertically in the ground using an alignment jig as described above, and may be characterized by providing a vertical hole vertically in the ground that forms a slope, inserting the vertical frame of the alignment jig into the vertical hole to support it, emitting a light beam from the light source of the alignment jig, aligning the drilling machine so that the light beam is irradiated along the drilling axis of the drilling machine, and fixing it opposite the retaining wall, and drilling a horizontal hole to the vertical hole using the drilling machine.

[0026] According to this retaining wall drilling method, a horizontal hole is drilled horizontally from the retaining wall to reach the vertical hole using the above-mentioned alignment jig. Here, the vertical frame of the alignment jig is inserted into and supported by the vertical hole, and the drilling machine is aligned and fixed facing the retaining wall so that light from the light source of the alignment jig is irradiated along the drilling axis of the drilling machine, and the horizontal hole is drilled. Therefore, the position and direction of the drilling machine can be adjusted very easily, and the horizontal hole can be made to reach the vertical hole reliably no matter what position or direction the vertical hole is provided in the soil that makes up the slope.

[0027] In this method of drilling holes in a retaining wall, a reference irradiated portion may be provided at a specific position that can identify a predetermined position, and the irradiation device may be positioned so that the reference irradiated portion can be irradiated with a light beam and supported on a support structure. In this way, by providing a reference irradiated portion at a specific position that can identify a predetermined position in the soil and installing an irradiation device so that this reference irradiated portion is irradiated with a light beam, it is possible to easily irradiate the light beam from the light source of the irradiation device to multiple positions along a predetermined direction, which makes it easy to install a positioning jig.

[0028] In this retaining wall drilling method, a horizontal hole may be drilled in the retaining wall while a light beam from a light source is irradiated onto the drilling machine, and then the alignment jig may be removed from the vertical hole and a horizontal hole may be drilled in soil softer than the retaining wall. In this way, since the position and orientation of the drilling machine fixed opposite the retaining wall are likely to change during the period when a horizontal hole is drilled in the hard retaining wall, light from the light source of the alignment jig is irradiated onto the drilling machine during that period. After that, since the position and orientation of the drilling machine are unlikely to change during the period when a horizontal hole is drilled in soil softer than the retaining wall, the irradiation of light from the light source of the alignment jig can be stopped and the alignment jig can be removed from the vertical hole. This makes it possible to place the alignment jig in another vertical hole, allowing for efficient use of the alignment jig.

[0029] In this retaining wall drilling method, when horizontal holes are drilled by a drilling machine so as to reach multiple vertical holes in succession in the ground, a vertical frame may be inserted into one vertical hole, and the horizontal frame may be positioned so that the light beam from the irradiation device is irradiated onto the remaining vertical holes, and an alignment jig may be installed. In this way, it is easy to make the horizontal holes reach multiple vertical holes in succession. [Effects of the Invention]

[0030] According to the present invention, it is possible to provide a retaining wall drilling device and alignment jig that can easily align and install a drilling machine relative to a retaining wall and ensure that horizontal holes reach predetermined positions in the soil, as well as a retaining wall drilling method. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a vertical cross-sectional view schematically showing a retaining wall drilling device using an alignment jig according to a first embodiment of the present invention. [Figure 2] FIG. 1 is a side view of an alignment jig according to a first embodiment of the present invention. [Figure 3] 1 is a side view of a centering portion of an alignment jig according to a first embodiment of the present invention. FIG. [Figure 4] 1 is a side view showing the upper end side of a vertical frame of the alignment jig according to the first embodiment of the present invention. [Figure 5] 1 is a side view of an irradiation device attached to a horizontal frame of an alignment jig according to a first embodiment of the present invention. FIG. [Figure 6] 3 is a partial side view showing a state in which the drilling machine is irradiated by an irradiation device of the alignment jig according to the first embodiment of the present invention. FIG. [Figure 7] 10(a) and 10(b) are side views showing modified examples of the connecting portion between the vertical frame and the horizontal frame of the alignment jig according to the first embodiment. [Figure 8] FIG. 10 is a side view showing a modified example of an irradiation device attached to a horizontal frame of the alignment jig according to the first embodiment of the present invention. [Figure 9] FIG. 10 is a vertical cross-sectional view schematically showing a retaining wall drilling device using an alignment jig according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a plan view schematically showing a retaining wall drilling device using an alignment jig according to a second embodiment of the present invention. [Figure 11] FIG. 10 is a vertical cross-sectional view schematically showing a retaining wall drilling device using an alignment jig according to a third embodiment of the present invention. [Figure 12] FIG. 10 is a plan view schematically showing a retaining wall drilling device using an alignment jig according to a third embodiment of the present invention. [Figure 13] A vertical cross-sectional view schematically showing the state in which a retaining wall is drilled using an alignment jig related to a modified embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] [First embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a vertical cross-sectional view that shows a schematic diagram of a state in which a retaining wall is drilled using a retaining wall drilling device having an alignment jig of this embodiment. In this embodiment, the retaining wall in which a horizontal hole is drilled will be described using an example of a wall made of a hard layer formed of concrete or the like or a wall made of masonry.

[0033] As shown in Figure 1, the retaining wall drilling device 10 is a device for drilling a horizontal hole 12 from the surface of a retaining wall R built on a slope to a pre-drilled vertical hole 11. Here, the vertical hole 11 is drilled at a predetermined position in the soil G that constitutes the slope S, for example, from the ground surface F at the top continuing from the top of the slope S to the back side. In this embodiment, the vertical hole 11 consists of a hollow columnar body 13 that is arranged vertically in the soil G and buried vertically. The hollow columnar body 13 consists of a tubular body with a circular cross section, and for example, a resin pipe is used.

[0034] The drilling device 10 includes a drilling machine 15, an installation unit 17 for disposing the drilling machine 15 in a fixed state on the retaining wall R, and an alignment jig 20 of this embodiment. The drilling machine 15 is a device that drills horizontal holes 12 in the soil G that constitutes the retaining wall R and slope S, and in this embodiment, a core machine is used. The drilling tools 19 used in the drilling machine 15 are a diamond cutter that can drill horizontal holes 12 in the hard retaining wall R, and an earth auger drill that can drill horizontal holes 12 in the soil G that constitutes the slope S. The drilling machine 15 is configured so that the diamond cutter and the earth auger drill can be freely replaced while remaining coaxial.

[0035] The installation section 17 fixes and arranges the drilling machine 15 at a predetermined position facing the retaining wall R, and in this embodiment is provided integrally with the drilling machine 15. The installation section 17 has a base section 17a and a guide rail 17b. The base section 17a is installed by being directly fixed to the retaining wall R using anchor bolts or the like, and is configured so that its angle with respect to the retaining wall R is adjustable, i.e., its angle with respect to the horizontal and vertical directions is adjustable. The guide rail 17b protrudes from the base section 17a, for example in the normal direction, and supports the drilling machine 15 so that it can move back and forth along the guide rail 17b.

[0036] 2 is a side view of the alignment jig 20 of this embodiment. As shown in FIG. 2, the alignment jig 20 is used to accurately align the drilling machine 15 for drilling the horizontal holes 12 with respect to the retaining wall R. The alignment jig 20 includes a support structure 18 and an irradiation device 23 supported by the support structure 18 . The support structure 18 includes a vertical frame 21 and a horizontal frame 22. The vertical frame 21 is formed so as to be insertable into the vertical hole 11. In this embodiment, the vertical frame 21 is configured to be inserted into and supported by the hollow portion 13a of the hollow columnar body 13. The vertical frame 21 includes a vertical frame main body 25 formed of a rod-like body extending in one axial direction, centering portions 26 fixedly provided at multiple positions on the vertical frame main body 25, and stopper portions 27 provided on the upper part of the vertical frame main body 25.

[0037] 3 is a side view showing the centering portion 26. The centering portion 26 is a member for positioning the vertical frame main body 25 near the center of the hollow columnar body 13. The centering portions 26 are arranged at multiple positions above and below around the vertical frame main body 25, and are formed so as to be able to abut against the inner surface of the hollow portion 13a of the hollow columnar body 13. The centering portions 26 of this embodiment have a circular plate 26a corresponding to the inner surface of the hollow portion 13a, and a plate fixing portion 26b for fixing the circular plate 26a to the vertical frame main body 25. The vertical frame main body 25 is disposed at the center of the circular plate 26a. A cushion material 26c is attached in an annular shape to the outer peripheral surface of the circular plate 26a. The cushion material 26c is disposed in the clearance between the inner surface of the hollow portion 13a and the outer peripheral surface of the circular plate 26a, preventing rattling of the vertical frame 21 within the hollow portion 13a.

[0038] FIG. 4 is a side view showing the upper end side of the vertical frame. The stopper portions 27 are fixedly provided to protrude laterally from the upper portion of the vertical frame main body 25. The stopper portions 27 abut against the upper ends of the hollow columnar bodies 13 from above, thereby holding the horizontal frame 22 above the ground F. 2 and 4, the horizontal frame 22 is fixed to the upper end of the vertical frame 21 so as to be perpendicular to the vertical frame 21. In this embodiment, the horizontal frame 22 is formed of a rod-shaped body extending in one axial direction.

[0039] In this embodiment, the rod-shaped horizontal frames 22 are fixed to the rod-shaped vertical frames 21, protruding on both sides thereof so as to be perpendicular to the vertical frames 21, and fixing structures are provided on both sides of the vertical frame main body 25. Note that the horizontal frames 22 and the vertical frames 21 do not have to be perpendicular as long as their central axes are in the same plane. In this fixing structure, the horizontal frames 22 are arranged in contact with the ends of the vertical frame main body 25, and brackets 29a are fixed to the side surfaces of the vertical frame main body 25 and the bottom surfaces of the horizontal frames 22 on each side, and the side surfaces of the vertical frame main body 25 and the horizontal frames 22 are supported by approximately triangular reinforcing plates 29b, and are connected so that the central axes of the vertical frame main body 25 and the horizontal frames 22 are in the same plane.

[0040] Fig. 5 is a side view of the irradiation device attached to the horizontal frame, and Fig. 6 is a partial side view showing the state in which the irradiation device is irradiating the drilling machine 15. The irradiation device 23 is attached to the horizontal frame 22 and is capable of irradiating the drilling machine 15 installed against the retaining wall R. The irradiation device 23 has a light source 23a capable of emitting a light beam in a radiation direction. Here, the light beam is light emitted from the light source 23a that does not substantially spread, and it is sufficient that the light is such that the irradiated area can be clearly recognized when irradiated. The light source is disposed inside the irradiation device 23, and the light beam emitted from the light source is emitted to the outside through an irradiation hole provided in the housing of the irradiation device 23. In this embodiment, the entire system from the internal light source to the irradiation hole through which the light beam is emitted to the outside is collectively referred to as the light source 23a. The irradiation device 23 is configured to emit laser light from the light source 23a in a radial direction, which is the entire circumference, to irradiate the irradiated area in a stripe-like manner. Being able to emit a light beam in a radial direction means that the light source 23a can emit the light beam over a wide range in the radial direction along an imaginary plane. In this embodiment, the light beam from the light source 23a is emitted while changing its emission direction so as to rotate 360 ​​degrees in a short period of time. An example of such an irradiation device is a "CX Line Laser" (trademark, manufactured by Muratec KDS Co., Ltd.). When the light beam emitted in the radial direction reaches the irradiated area, the emission direction changes in a short period of time, and multiple positions are continuously irradiated, forming a stripe of light on the irradiated area.

[0041] 5, the irradiation device 23 is supported on the horizontal frame 22 by a support bracket 24 so that the light source 23a is disposed directly below the horizontal frame 22. The support bracket 24 is provided with an adjustment mechanism that can adjust the position of the irradiation device 23 relative to the horizontal frame 22 and the tilt in the vertical and horizontal directions. In this embodiment, the position of the irradiation device 23 relative to the longitudinal direction of the horizontal frame 22 is adjustable by the horizontal shaft screw portion 24c provided on the support bracket 24. The irradiation device 23 can be fixed to any position in the longitudinal direction of the horizontal frame 22 by the horizontal shaft screw portion 24c, and can be attached to any position on the horizontal frame 22. The circumferential adjustment screw portion 24a allows adjustment of the irradiation device 23 in the left and right rotational direction. Furthermore, the pressure adjustment screw 24b allows adjustment of the tilt of the irradiation device 23 in the up and down direction.

[0042] When adjusting the orientation of the irradiation device 23, the support structure 18 is used as a reference irradiation part, and adjustment is made so that the light beam emitted in the radial direction from the light source 23a of the irradiation device 23 is irradiated onto the vertical frame 21 and the horizontal frame 22. In this embodiment, adjustment is made so that a line of light is formed along the axis of the vertical frame main body 25 and the axis of the horizontal frame 22. During use, the vertical frame 21 is inserted into the vertical hole 11, and the support structure 18 can indicate a specific position that allows the position of the vertical hole 11 to be identified. Therefore, by adjusting the illumination device 23 so that the vertical frame 21 and the horizontal frame 22 can be illuminated with a light beam from the light source 23a, it is possible to direct the light beam formed by the illumination device 23 toward the vertical hole 11 in the ground G. To install the drilling machine 15 against the retaining wall R, as shown in Figure 6, a light beam emitted from the light source 23a of the illumination device 23 forms a light streak, and the drilling machine 15 is aligned and installed so that this light streak illuminates a number of consecutive positions along the drilling axis La of the drilling tool 19 of the drilling machine 15, thereby allowing the drilling machine 15 facing the retaining wall R to be fixed in an appropriate orientation.

[0043] Next, a method for drilling a retaining wall R using the drilling device 10 for the retaining wall R equipped with the above-described alignment jig 20 will be described. Here, a method will be described in which a vertical hole 11 is drilled vertically in the soil G that constitutes a slope S, and a horizontal hole 12 is drilled horizontally from the retaining wall R constructed on the slope using the alignment jig 20 to reach the hollow columnar body 13.

[0044] First, a vertical hole 11 is provided vertically in the soil G that constitutes the slope S. In this embodiment, a hollow columnar body 13 is buried in the soil G. The hollow columnar body 13 is buried so that its upper end opens to the ground F. This vertical hole and hollow columnar body 13 may be installed in advance.

[0045] Now, the alignment jig 20 is prepared. The illumination device 23 is attached to the horizontal frame 22 at a position suitable for the retaining wall R or the hollow columnar body 13. The illumination device 23 may be located in any position that allows it to irradiate the light beam from the light source 23a at the position where the horizontal hole 12 of the retaining wall R is to be formed, and for example, the illumination device 23 is placed above the retaining wall R. The light source 23a is also placed directly below the horizontal frame 22, and the position and inclination of the illumination device 23 are adjusted so that the light beam from the light source 23a irradiates the central axes of the vertical frame 21 and the horizontal frame 22.

[0046] The vertical frame 21 of the alignment jig 20 prepared in this way is inserted into the hollow portion 13a of the hollow columnar body 13 formed in the vertical hole 11. The centering portions 26 arranged in multiple positions above and below the vertical frame main body 25 are also housed in the hollow portion 13a. Then, the stopper portion 27 is abutted against the top of the hollow columnar body 13. In this state, the centering portion 26 is positioned in abutment with the inner surface of the hollow portion 13a without any rattle. Therefore, the vertical frame main body 25 is positioned near the axis of the hollow portion 13a along the axis and is supported by the hollow columnar body 13. This makes it possible to accurately identify the position of the vertical hole 11 in the ground by the vertical frame 21 placed in the vertical hole 11.

[0047] Then, with the irradiation device 23 positioned above the retaining wall R, a light beam is emitted from the light source 23a of the positioning jig 20 to form a light streak on the retaining wall R. In this state, the installation unit 17 is used to position the drilling machine 15 facing the retaining wall R, the light beam from the light source 23a is irradiated onto the drilling machine 15, and the position and orientation of the drilling machine 15 in the vertical and horizontal directions are adjusted by the installation unit 17. This aligns the drilling machine 15 so that the light beam from the light source 23a is irradiated along the drilling axis La of the drilling tool 19 of the drilling machine 15. Once aligned, the drilling machine 15 is fixed to the retaining wall R by the installation unit 17.

[0048] By driving the drilling machine 15 while irradiating a light beam from the light source 23a along the drilling axis La of the drilling tool 19 of the drilling machine 15, the drilling tool 19 of the drilling machine 15 drills a horizontal hole 12 in the hard retaining wall R. After the horizontal hole 12 has been drilled through the retaining wall R, the alignment jig 20 is removed from the vertical hole 11. The drilling tool 19 of the drilling machine 15 is changed from a diamond cutter to an earth auger drill, and the drilling machine 15 is driven to drill the horizontal hole 12 in the soil G, which is softer than the retaining wall R.

[0049] By continuing drilling, the horizontal hole 12 formed in the retaining wall R and the soil G reaches the hollow portion 13a of the hollow columnar body 13 of the vertical hole 11, and by switching to a diamond cutter again to open the hollow columnar body 13, the drilling of the horizontal hole 12 is completed. The alignment jig 20 removed from the vertical hole 11 is then inserted into the vertical hole 11 for drilling the horizontal hole 12, and is ready for use in the next process.

[0050] According to the drilling device 10 using the above-described alignment jig 20, when drilling a horizontal hole 12 from the retaining wall R to a predetermined position in the ground G, the alignment jig 20 can align the drilling machine 15. The alignment jig 20 is equipped with an illumination device 23 supported by the support structure 18 so as to be able to illuminate the drilling tool 19. The illumination device 23 can illuminate a light beam at multiple positions along a predetermined direction that allows the drilling tool 19 of the drilling machine 15 to reach the predetermined position in the ground G. Therefore, when installing the drilling machine 15 on the retaining wall R, simply by aligning the drilling machine 15 so that multiple positions on the drilling tool 19 are illuminated by the light beam from the light source 23a of the illumination device 23, the drilling machine 15 can be installed in alignment with the retaining wall R with the drilling tool 19 reliably positioned facing a predetermined position in the ground G. Then, when the horizontal hole 12 is drilled with this drilling tool 19, it is possible to drill the horizontal hole 12 so that it always reaches the vertical hole 11. Therefore, the drilling machine 15 can be installed in alignment with the retaining wall R extremely easily, and the horizontal hole 12 can be reliably reached to a predetermined position in the ground G.

[0051] In the drilling device 10 using the alignment jig 20 of this embodiment, the illumination device 23 is installed so that the support structure 18, which is placed at a specific position that can identify the position of the vertical hole 11 in the ground G, is irradiated with a light beam as a reference illuminated part. Therefore, the light beam from the light source 23a of the illumination device 23 can easily be used to irradiate a continuous line of light at a position along the direction of the vertical hole 11. This makes it easy to install the alignment jig 20.

[0052] In the drilling device 10 using the alignment jig 20 of this embodiment, the reference irradiated portion is provided on the support structure 18. Therefore, the irradiation device 23 and the reference irradiated portion to be irradiated with the light beam are present on the same support structure 18, so that the orientation of the irradiation device 23 can be easily adjusted.

[0053] In the drilling device 10 using the alignment jig 20 of this embodiment, the drilling machine 15 drills the horizontal hole 12 so that it reaches the vertical hole 11 provided at a predetermined position, and the support structure 18 preferably includes a vertical frame 21 that has a reference irradiation portion and is installed in the vertical hole 11, and a horizontal frame 22 that has an irradiation device 23 attached to it and is fixed to the vertical frame 21 and extends in the horizontal direction. In this way, by installing the vertical frame 21 in the vertical hole 11, the light beam from the irradiation device 23 can be easily irradiated onto multiple positions along a predetermined direction toward the vertical hole 11. Therefore, the position and orientation of the drilling machine 15 can be easily aligned when drilling the horizontal hole 12, and the horizontal hole 12 can be reliably reached the vertical hole 11.

[0054] In this embodiment, the irradiation device 23 is configured to emit laser light from the light source 23a in the radiation direction to irradiate the irradiated area in a stripe shape, so that the irradiated area can be brightly irradiated with a clear stripe of light, improving visibility during alignment.

[0055] In this embodiment, the vertical hole 11 consists of a hollow columnar body 13 arranged vertically in the ground G that forms the slope S, and the vertical frame 21 is inserted into the hollow portion 13a of the hollow columnar body 13 to support it. This stabilizes the shape of the hollow portion 13a of the hollow columnar body 13 into which the vertical frame 21 is inserted and supported, allowing for stable placement of the vertical frame 21. Furthermore, the alignment jig 20 can be easily stabilized after being installed in the vertical hole 11, and tilting is unlikely to occur after installation. This allows the irradiation device 23 to irradiate the light beam with high precision.

[0056] In this embodiment, the vertical frame 21 has a rod-shaped vertical frame main body 25 and centering portions 26 that are arranged in at least two locations above and below the vertical frame main body 25 and abut against the inner surface of the hollow portion 13a, thereby positioning the vertical frame main body 25 near the center of the hollow columnar body 13. Therefore, the centering portion 26 allows the vertical frame body 25 to be positioned near the center of the hollow columnar body 13, and the horizontal hole 12 can be easily drilled so that it reaches near the center of the hollow columnar body 13, allowing the horizontal hole 12 to be formed more accurately.

[0057] In this embodiment, the horizontal frame 22 has a stopper portion 27 for holding the horizontal frame 22 above the ground surface F, and the vertical frame 21 is held in that position by abutting against the upper end of the hollow columnar body 13 from above. Therefore, the alignment jig 20 can be installed on the hollow columnar body 13 that is longer than the vertical frame 21, and a horizontal hole can be drilled in a deeper vertical hole 11. Furthermore, because no unnecessary force from the ground surface F acts on the horizontal frame 22, the irradiation device 23 can be positioned with precision relative to the vertical frame 21, and the irradiation device 23 can irradiate the light beam with precision.

[0058] In this embodiment, the rod-shaped horizontal frame 22 is arranged and fixed perpendicular to the rod-shaped vertical frame 21, and is reinforced on both sides of the vertical frame 21 to keep the horizontal frame 22 perpendicular to the vertical frame 21. In this way, the horizontal frame 22 is reinforced on both sides of the vertical frame 21 to maintain a right angle, so that the horizontal frame 22 can be firmly fixed to the vertical frame 21, and as long as rigidity can be ensured, the horizontal frame 22 can be maintained at a right angle with precision relative to the vertical frame 21. This allows the irradiation device 23 to irradiate the light beam with precision.

[0059] In this embodiment, the irradiation device 23 is supported by the horizontal frame 22 so that the light source 23a can be disposed directly below the horizontal frame 22, and the inclination of the irradiation device 23 is adjustable so that the light beam emitted in the radial direction from the light source 23a irradiates the central axes of the vertical frame 21 and the horizontal frame 22. Therefore, the irradiation device 23 can be installed on the horizontal frame 22 and adjusted with high precision, making the alignment jig 20 easy to use.

[0060] According to the above-described method for drilling a retaining wall R, a positioning jig 20 is used to drill a horizontal hole 12 laterally from the retaining wall R constructed on a slope, reaching the hollow columnar body 13. In this embodiment, the vertical frame 21 of the positioning jig 20 is inserted into and supported by the vertical hole 11, and the drilling machine 15 is positioned and fixed facing the retaining wall R so that the light beam from the light source 23a of the positioning jig 20 is irradiated along the drilling axis La of the drilling machine 15, and the horizontal hole 12 is drilled. Therefore, the position and orientation of the drilling machine 15 can be aligned very easily, and the horizontal hole 12 can be reliably reached by the vertical hole 11 regardless of the position or orientation of the vertical hole 11 in the soil G that constitutes the slope S.

[0061] In the above embodiment of the method for drilling a retaining wall R, a horizontal hole 12 is drilled in the retaining wall R while a light beam from the light source 23a is irradiated onto the drilling machine 15, and then the alignment jig 20 is removed from the vertical hole 11 and the horizontal hole 12 is drilled in the soil G, which is softer than the retaining wall R. In this method, during the period when the horizontal hole 12 is drilled in the hard retaining wall R, the position and orientation of the drilling machine 15 fixed opposite the retaining wall R are likely to change, so during that period, a light beam is irradiated onto the drilling machine 15 from the light source 23a of the alignment jig 20 while drilling. After that, during the period when the horizontal hole 12 is drilled in the soil G, which is softer than the retaining wall R, the position and orientation of the drilling machine 15 are unlikely to change, so the irradiation of the light beam from the light source 23a of the alignment jig 20 can be stopped and the alignment jig 20 can be removed from the vertical hole 11. Therefore, the next process, such as placing the alignment jig 20 in another vertical hole 11, can be carried out, and the alignment jig 20 can be used efficiently.

[0062] The first embodiment can be modified as appropriate within the scope of the present invention. For example, in the first embodiment, the horizontal frame 22 is fixed to the vertical frame 21 so that it is perpendicular to the vertical frame 21, but this is not particularly limited. It is also possible to fix the horizontal frame 22 to the vertical frame 21 so that the axis of the horizontal frame 22 intersects the axis of the vertical frame 21 obliquely in the up-down direction. In this case, for example, as shown in Figure 7(a), a reinforcing plate 29b is used to connect and reinforce the vertical frame 21 and the horizontal frame 22 from the side of the connecting portion, and an arc-shaped long hole 29c is provided in the reinforcing plate 29b with its center at the intersection of the axis of the vertical frame 21 and the axis 22 of the horizontal frame 22, and by adjusting the angle using this long hole 29c, the horizontal frame 22 can be fixed at an angle to the vertical frame 21.

[0063] Also, as shown in Figure 7(b), for example, the end of the vertical frame 21 and the end of the horizontal frame 22 can be connected by a connecting part 29d so that the angle can be adjusted, and the vertical frame 21 and the horizontal frame 22 can be fixed at any angle by a clamping lever 29e. If the horizontal frame 22 can be fixed at an angle in the vertical direction relative to the frame 21, the illumination device 23 can be positioned closer to the drilling machine 15, and the light beam from the illumination device 23 can be more strongly irradiated onto the drilling tool 19 of the drilling machine 15.

[0064] Furthermore, in the above description, the illumination device 23 is mounted directly below the horizontal frame 22. However, as shown in FIG. 8, for example, the illumination device 23 can be mounted on the horizontal frame 22 so that the light source 23a is positioned laterally offset from the axis of the horizontal frame 22. When the light source 23a is positioned at a distance d laterally from the axis of the horizontal frame 22, the orientation of the illumination device 23 can be adjusted and mounted on the horizontal frame 22 so that the light beam from the light source 23a is irradiated at a position at distance d from the axis of the vertical frame 21. By positioning the drilling machine 15 so that the light beam is irradiated at a position at distance d from the axis La of the drilling tool 19, the drilling machine 15 can be installed in an orientation that reaches the vertical hole 11.

[0065] Furthermore, in the first embodiment, it is also possible to support the irradiation device 23 on a structure separate from the vertical frame 21, without using the horizontal frame 22. In that case, for example, by installing the vertical frame 21 in the vertical hole 11 and using the vertical frame 11 as a reference irradiation part, it is possible to position the irradiation device 23 in an appropriate direction and to properly align the drilling machine 15. Furthermore, in the above first embodiment, an example was described in which the vertical hole 11 was constructed using a hollow columnar body 13, but it may also be a hole drilled linearly into the ground G without using a hollow columnar body 13.

[0066] [Second embodiment] FIG. 9 is a vertical cross-sectional view that schematically shows a state in which a retaining wall is drilled using a retaining wall drilling device having an alignment jig according to the second embodiment, and FIG. 10 is a plan view thereof. This second embodiment is an example in which a retaining wall drilling device 10 having an alignment jig 20 is used to drill a horizontal hole 12 in a predetermined direction so that the horizontal hole 12 reaches a water tank 35 buried at a predetermined position underground G from a retaining wall R.

[0067] In the drilling device 10 of the second embodiment, the support structure 18 includes a tower 36 stably installed at an arbitrary position on the ground F, and a horizontal frame 22 fixed to the tower 36 and arranged to extend laterally at a position above the ground F. The irradiation device 23 is attached to a portion of the horizontal frame 22 arranged above the retaining wall R. The rest is the same as in the first embodiment.

[0068] To drill a horizontal hole 12 from the retaining wall R to a desired position of the water tank 35 underground G using the retaining wall drilling device 10 of the second embodiment, first, a tower 36 is placed on the ground F in which the water tank 35 is buried. A horizontal frame 22 to which an illumination device 23 is attached is fixed to the top of the tower 36, and the illumination device 23 is placed above the retaining wall R and the ground F so that it can illuminate the retaining wall R and the ground F.

[0069] 10, a mark 37 is provided as a reference irradiated portion at a predetermined position in the ground G, that is, on the ground F directly above the desired position to which the horizontal hole 12 is to be extended in the buried water tank 35. The desired position to which the horizontal hole 12 is to be extended in the water tank 35 is located in the ground G directly below this mark 37, and therefore the mark 37 serves as a specific position that can identify the desired position. A light beam is emitted from the light source 23a of the illumination device 23, and the position and orientation of the illumination device 23 are adjusted and installed so that the light beam illuminates the mark 37 on the ground surface F and also illuminates the outer surface of the retaining wall R. As a result, a streak of light is formed on the retaining wall R by the light beam emitted from the light source 23a.

[0070] In this state, as in the first embodiment, the drilling machine 15 is positioned so that the light beam from the light source 23a is irradiated along the drilling axis La of the drilling tool 19 of the drilling machine 15, and the drilling machine 15 is installed on the retaining wall R by the installation unit 17. Then, the drilling machine 15 is driven to drill a horizontal hole 12 in the retaining wall R, and the drilling tool 19 of the drilling machine 15 is changed and the drilling machine 15 is driven again to drill a horizontal hole 12 in the soil G which is softer than the retaining wall R. The drilling of the horizontal hole 12 is completed when the horizontal hole 12 reaches and penetrates the desired position in the water tank 35.

[0071] The retaining wall drilling device 10 of the second embodiment and the drilling method using this device as described above can also provide the same effects as those of the first embodiment. In this embodiment, the horizontal hole 12 is drilled toward a desired position in a water tank 35 buried in the ground G, and a mark 37 is provided as a reference irradiated portion at a specific position that allows the desired position to be identified, and the irradiation device 23 is installed so that the mark 37 is irradiated with a light beam from the light source 23a. Therefore, the light beam from the light source 23a of the irradiation device 23 can be irradiated onto a plurality of positions toward the desired position, and the positioning of the irradiation device 23 and the positioning of the drilling machine 15 can be easily performed.

[0072] In this second embodiment, the irradiation device 23 is supported by a support structure 18 formed by fixing a horizontal frame 22 to a tower 36, but it is also possible to use the irradiation device 23 by supporting it on other structures such as scaffolding installed near the retaining wall R.

[0073] [Third embodiment] Fig. 11 is a vertical cross-sectional view showing a state in which a retaining wall is drilled using a retaining wall drilling device having an alignment jig according to a third embodiment, and Fig. 12 is a plan view thereof. The third embodiment is an example in which horizontal holes 12 are drilled using a drilling device 10 so that the horizontal holes 12 reach multiple vertical holes 11a, 11b provided in the ground G in succession.

[0074] As shown in Figures 11 and 12, the alignment jig 20 of this embodiment uses a support structure 18 in which horizontal frames 22 are provided continuously in a linear direction on both sides of a vertical frame 21. Illumination devices 23x and 23y are supported on the horizontal frame 22 at positions on both sides of the vertical frame 21, respectively. Each of the illumination devices 23x and 23y has a configuration similar to that of the first embodiment and includes a light source 23a that can emit a light beam in the radiation direction. The light beams from each of the illumination devices 23x and 23y can form continuous light stripes on both sides of the vertical frame 21, respectively.

[0075] As in the first embodiment, each of the irradiation devices 23x, 23y is disposed directly below the horizontal frame 22, and its position and orientation relative to the horizontal frame 22 can be adjusted by the support bracket 24. This allows the light beams from each of the irradiation devices 23x, 23y to be aligned with the axis of the vertical frame main body 25 and the axis of the horizontal frame 22 on both sides of the vertical frame 21.

[0076] In this embodiment, such an alignment jig 20 is used to drill a horizontal hole 12 from the retaining wall R with a drilling machine 15, so that the horizontal hole 12 reaches the vertical hole 11a and the vertical hole 11b in a straight line. First, the vertical frame 21 is inserted into one of the vertical holes 11a in the same manner as in the first embodiment, and the alignment jig 20 is installed. At this time, the orientation of the horizontal frame 22 is adjusted so that the light beam from the irradiation device 23x is irradiated onto the remaining vertical hole 11b.

[0077] Then, with the light beam formed by the light beam of the illumination device 23x on one side illuminating the vertical hole 11b, the light beam of the illumination device 23y on the other side is illuminated toward the retaining wall R to form a light beam. The illumination device 23y is arranged so that the light beam formed by the illumination device 23y illuminates the drilling tool 19, and the drilling machine 15 is positioned so that the light beam is illuminated at multiple consecutive positions along the drilling axis La of the drilling tool 19 of the drilling machine 15, as in the first embodiment.

[0078] At this time, with the vertical frame 21 of the alignment jig 20 installed in the vertical hole 11a, the vertical hole 11b is illuminated with a light beam from one of the illumination devices 23x mounted on the horizontal frame 22, and therefore the light streak formed by the light beam from the other illumination device 23y mounted on the horizontal frame 22 is formed in a direction that intersects with the two vertical holes 11a, 11b. In this state, the drilling machine 15 is installed on the retaining wall R by the installation part 17, and the drilling axis La of the drilling tool 19 is arranged along the line of light, so that the drilling tool 19 is installed in an orientation that allows it to reach the two vertical holes 11a and 11b in a straight line. This allows the drilling machine 15, which is facing the retaining wall R, to be fixed in an appropriate orientation.

[0079] Thereafter, the drilling machine 15 is driven, and the drilling tool 19 of the drilling machine 15 drills the horizontal hole 12 in the retaining wall R and the soil G inside. The horizontal hole 12 is then formed linearly and reaches the vertical hole 11a, and then penetrates the vertical hole 11a to reach the vertical hole 11b. This allows the drilling of the horizontal hole 12 that reaches the vertical hole 11a and the vertical hole 11b in a continuous linear manner from the retaining wall R.

[0080] The retaining wall drilling device 10 of the third embodiment and the drilling method using this device can also achieve the same effects as those of the first embodiment. Moreover, in this embodiment, the horizontal holes 12 can be formed so as to reach the multiple vertical holes 11a, 11b in succession.

[0081] The above-described embodiments can be modified as appropriate within the scope of the present invention. For example, in the above embodiment, the retaining wall R was described using examples of a wall with a hard layer of concrete or the like formed on the surface of a slope, or a wall made of stacked hard materials such as stonework, but the present invention can also be applied to a soft retaining wall with various types of curing such as plants applied to the slope. Furthermore, in each of the above embodiments, an example has been described in which the installation section 17 for fixing and installing the drilling machine 15 to the retaining wall R is installed by directly fixing the base section 17a to the hard retaining wall R, but this is not particularly limited. For example, in the case of a slope that is a hard wall with large irregularities or a soft wall, as shown in Fig. 13, it is possible to install the drilling machine 15 by fixing it facing the retaining wall R and installing it by installing a grounding stand 31 made of a rigid body adjacent to the surface of the slope and fixing the base section 17a to this grounding stand 31.

[0082] Furthermore, in each of the above embodiments, the irradiation device 23 has been described as an example of a device that emits a light beam made of laser light from the light source 23a in a radial direction that covers the entire circumference, but this is not particularly limited. The light source 23a of the irradiation device 23 may emit a light beam toward a partial area, or may emit a light beam in a radial direction from the light source 23a in a fan-shaped range. For example, a light beam may be irradiated onto the drilling machine 15 and the retaining wall R near where the drilling machine 15 is installed, to form a streak of light. Furthermore, the irradiation device 23 may be one that emits a light beam from the light source 23a in only one direction. In this case, if the irradiation device 23 is supported by the support structure 18 so as to be swingable in one direction and the irradiation position of the light beam can be changed along the drilling axis La by swinging the irradiation device 23, it can be used to align the drilling tool 19 of the drilling machine 15. [Explanation of symbols]

[0083] 10 Drilling device 11, 11a, 11b vertical holes 12 horizontal hole 13 Hollow columnar body 13a Hollow part 15 Drilling machine 17 Installation part 17a Base 17b Guide rail 18 Support structure 19 Drilling tools 20 Alignment jig 21 Vertical Frame 22 Horizontal frame 23 Irradiation device 23a light source 24 Support bracket 24a Circumferential adjustment screw part 24b Pressure adjustment screw 24c Horizontal shaft threaded portion 25 Vertical frame body 26 Centering section 26a Round Plate 26b Plate fixing part 26c cushioning 27 Stopper part 29a Bracket 29b Reinforcement plate 31 Grounding stand 35 Water Tank 36 Turret 37 Landmark S slope G Underground R retaining wall F ground La drilling shaft

Claims

1. a drilling machine that drills horizontal holes from the retaining wall into the soil; an alignment jig for aligning the drilling machine by directing a drilling tool of the drilling machine in a predetermined direction relative to the retaining wall so that the horizontal hole reaches a predetermined position in the soil; an installation unit for installing the drilling machine in a fixed state facing the retaining wall; A retaining wall drilling device comprising: the alignment jig has a light source that emits a light beam, and an irradiation device that irradiates a plurality of positions along the predetermined direction with the light beam from the light source; a support structure that supports the irradiation device so as to be able to irradiate the drilling tool; A retaining wall drilling device, the drilling machine being capable of being positioned so that multiple positions of the drilling tool are illuminated by the light beam of the illumination device supported by the support structure.

2. The retaining wall drilling device according to claim 1 , wherein a reference irradiated portion that can be irradiated by the light beam is provided at a specific position that can identify the predetermined position.

3. The retaining wall drilling device according to claim 2 , wherein the reference irradiated portion is provided on the support structure.

4. The drilling machine drills the horizontal hole so as to reach the vertical hole provided at the predetermined position, The retaining wall drilling device described in claim 3, wherein the support structure comprises a vertical frame having the reference irradiated portion and installed in the vertical hole, and a horizontal frame to which the irradiation device is attached, fixed to the vertical frame, and extending horizontally.

5. The retaining wall drilling device according to claim 1 , wherein the irradiation device emits laser light as the light beam from the light source in a radiation direction to irradiate the irradiated area in a stripe-like manner.

6. 5. The retaining wall drilling device according to claim 4, wherein the vertical hole comprises a hollow pillar arranged vertically in the soil, and the vertical frame is inserted into the hollow portion of the hollow pillar and supported therein.

7. The retaining wall drilling device described in claim 4, wherein the vertical frame has a rod-shaped vertical frame main body and a centering portion arranged in at least two locations above and below the vertical frame main body and abutting the inner surface of the hollow portion to position the vertical frame main body near the center of the vertical hole.

8. The retaining wall drilling device according to claim 4 , wherein the vertical frame is provided with a stopper portion that abuts against the upper end of the vertical hole from above to hold the horizontal frame above the ground.

9. A retaining wall drilling device as described in claim 4, wherein the rod-shaped horizontal frame is arranged and fixed in a direction intersecting the rod-shaped vertical frame, and the horizontal frame is reinforced on both sides of the vertical frame so as to maintain an angle relative to the vertical frame.

10. A retaining wall drilling device as described in claim 4, wherein the illumination device is supported on the horizontal frame so that the light source is positioned directly below the horizontal frame, and the inclination of the illumination device is adjusted so that the light beam emitted in the radial direction from the light source irradiates the central axis of the vertical frame and the horizontal frame.

11. When drilling a horizontal hole from a retaining wall to a predetermined position in the soil, an alignment jig is used to align the drilling machine by orienting a drilling tool of the drilling machine that drills the horizontal hole in a predetermined direction relative to the retaining wall, an irradiation device having a light source capable of emitting a light beam, and irradiating a plurality of positions along the predetermined direction with the light beam from the light source; a support structure that supports the irradiation device so as to be able to irradiate the drilling tool; an alignment jig that aligns the drilling machine so that multiple positions on the drilling tool are illuminated by the light beam of the illumination device supported by the support structure;

12. An alignment jig for aligning a drilling machine that drills a horizontal hole with respect to the retaining wall when drilling a horizontal hole from the retaining wall to reach the vertical hole, A vertical frame inserted into the vertical hole, a horizontal frame fixed to the vertical frame and perpendicular to the vertical frame, and an irradiation device attached to the horizontal frame to irradiate the drilling machine installed against the retaining wall, the illumination device has a light source that emits a light beam in a radiation direction, and is attached to the horizontal frames so that the light beam from the light source can illuminate the vertical frames and the horizontal frames; An alignment jig that aligns the drilling machine so that the drilling axis of the drilling tool is illuminated by the light beam from the light source when the vertical frame is inserted into the vertical hole and the illumination device is positioned above the retaining wall.

13. A method for drilling a retaining wall in which a horizontal hole is drilled in a predetermined direction by a drilling machine so that the horizontal hole reaches a predetermined position in the soil from the retaining wall, an irradiation device is supported by a support structure so that a light beam emitted from the light source can be irradiated at a plurality of positions along the predetermined direction; The drilling machine is positioned and installed facing the retaining wall so that the drilling tool is irradiated at a plurality of positions by a light beam from the irradiation device supported by the support structure; A method for drilling a retaining wall, wherein the horizontal hole is drilled by the drilling tool.

14. A method for drilling a retaining wall, comprising drilling a horizontal hole from the retaining wall in a horizontal direction to reach a vertical hole provided vertically in the ground using the alignment jig according to claim 12, The vertical hole is provided in the soil constituting the slope in a vertical direction, The vertical frame of the alignment jig is inserted into the vertical hole to be supported; a light beam is emitted from the light source of the alignment jig, and the drilling machine is aligned and fixed facing the retaining wall so that the light beam is irradiated along the drilling axis of the drilling machine; A method for drilling a retaining wall, in which the horizontal hole is drilled up to the vertical hole by the drilling machine.

15. A retaining wall drilling method as described in claim 13, wherein a reference irradiated portion is provided at a specific position that can identify the specified position, and the irradiation device is positioned so that the reference irradiated portion can be irradiated with the light beam and supported on the support structure.

16. A method for drilling a retaining wall as described in claim 13, wherein after drilling the horizontal hole in the retaining wall while irradiating the drilling machine with a light beam from the light source, the alignment jig is removed from the vertical hole and the horizontal hole is drilled in soil softer than the retaining wall.

17. A retaining wall drilling method as described in claim 13, wherein when the horizontal holes are drilled by the drilling machine so as to reach the plurality of vertical holes provided in the soil in succession, the vertical frame is inserted into one of the vertical holes, the horizontal frame is positioned so that the light beam from the irradiation device is irradiated onto the remaining vertical holes, and the alignment jig is installed.

Images