Recovery method, recovery device, and core recovery tool

Abstract

To provide a recovery method, a recovery apparatus and a core recovery tool for efficiently recovering a core in a core hole extending in a horizontal direction.SOLUTION: A recovery apparatus 20 recovers a cylindrical core 61 formed by a perforation hole of a cylindrically formed core hole h1 extending in a horizontal direction in a concrete block 60 inside the core hole h1 and remaining. The recovery apparatus 20 comprises a core recovery tool 40 provided with a mounting part 45 formed in a shape in which an arc cross section corresponding to the size of the core hole h1 is continued. The recovery apparatus 20 mounts the core 61 on the mounting part 45, in a space between the core 61 abutted against a lower face of the core hole h1 and the core hole h1, by inserting a tip of the mounting part 45 into an upper part of the core 61 so as to rotate the core recovery tool 40. Then, the recovery apparatus 20 retreats the core recovery tool 40 in a state where the core 61 is mounted on the mounting part 45 to recover the core 61.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to a recovery method, recovery device, and core recovery tool for recovering a core (residue) remaining in a core hole drilled by a core bit. [Background technology]

[0002] A drilling device equipped with a cylindrical core bit is sometimes used to drill holes in structures such as concrete. When drilling long holes (deep holes), this drilling device may use an integrated core bit with a long shank (tube) (see, for example, Patent Document 1). The core bit of the drilling device described in this document is integrally formed with a bit section with a blade on the outer periphery of the tip of the cylinder and a coupling section that is attached to a rotation mechanism that rotates the core bit. This drilling device sucks in chips and forms a hole in the object to be drilled by rotating the core bit and moving it in a straight line. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-177740 Summary of the Invention [Problem to be solved by the invention]

[0004] When a core hole is formed using a drilling device so as to extend horizontally, a core (residue) may remain in the core hole, making it difficult to efficiently remove the core from the horizontally extending core hole. [Means for solving the problem]

[0005] The recovery method for solving the above problem is to insert a cylindrical core hole extending horizontally into a drilling target, Separated from the object to be drilled and in contact with the lower surface of the core holeA method for recovering a remaining cylindrical core using a recovery device, the recovery device including a core recovery tool having a mounting portion formed in a shape with a continuous arc cross section corresponding to the size of the core hole, and a tip of the mounting portion being attached to a front Note A and the core hole and Space In the space above the core After inserting it, The placement portion is advanced until the entire placement portion is inserted into the core hole; Rotate the core recovery tool Turned over With the core placed on the placement section, the core retriever is retracted to retrieve the core. In addition, in order to solve the above problems, The collection method is A cylindrical core hole extending horizontally in the object to be drilled is formed in the core hole. Separated from the object to be drilled and in contact with the lower surface of the core hole The remaining cylindrical core A method of recovering a core using a recovery device, the recovery device being equipped with a core recovery tool having a mounting portion formed in a shape with a continuous arc cross-section corresponding to the size of the core hole, and the tips of the pair of bifurcated mounting portions are inserted into the space between the core and the core hole, on the left and right sides of the core, and the core recovery tool is then advanced to place the core on the mounting portions, and with the core placed on the mounting portions, the core recovery tool is retracted to recover the core. [Effects of the Invention]

[0006] According to the present invention, the core (residue) in the core hole extending in the horizontal direction can be efficiently recovered. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a front view of the recovery device according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. [Figure 3] FIG. 2 is a perspective view of a retriever according to the first embodiment. [Figure 4] FIG. 2 is a front view of the retriever according to the first embodiment. [Figure 5] FIG. 2 is a top view of the retriever according to the first embodiment. [Figure 6] FIG. 2 is an explanatory diagram of a drilling device for forming a core hole in the first embodiment. [Figure 7] FIG. 3 is an explanatory diagram illustrating the positional relationship between a core and a core hole formed by the drilling device in the first embodiment. [Figure 8]8 is an explanatory diagram illustrating the positional relationship between the core and the core hole formed by the drilling device in the first embodiment, showing a state in which the tip of the core is cut vertically from the state in FIG. 7. FIG. [Figure 9] FIG. 2 is a front view of the recovery device of the first embodiment in a pre-recovery state. [Figure 10] FIG. 2 is a front view of the recovery device of the first embodiment with a recovery tool inserted into a core hole. [Figure 11] 1A and 1B are cross-sectional views of the first embodiment of the recovery device when the mounting portion of the recovery tool is inserted into the core hole, where (a) shows the state in which the tip of the mounting portion is positioned above the core in the core hole, (b) shows the state in which the mounting portion is rotating, and (c) shows the state in which the core is placed on the mounting portion. [Figure 12] FIG. 2 is a front view of the retriever of the first embodiment, showing a state in which a core is placed on a placement portion of the retriever. [Figure 13] FIG. 3 is a cross-sectional view of the core of the first embodiment in a state where the core is removed from a core hole. [Figure 14] FIG. 10 is a perspective view of a retriever according to a second embodiment. [Figure 15] FIG. 10 is a front view of a retriever according to a second embodiment. [Figure 16] FIG. 10 is a top view of a retriever according to a second embodiment. [Figure 17] FIG. 10 is a front view of the recovery device of the second embodiment in a pre-recovery state. [Figure 18] 10A and 10B are cross-sectional views of the recovery tool of the recovery device of the second embodiment when inserted into the core hole, where (a) shows the state in which the tip of the mounting part is positioned on the left and right of the core in the core hole, (b) shows the state in which the tip of the mounting part is inserted halfway, and (c) shows the state in which the core is placed on the recovery tool. [Figure 19] FIG. 10 is a front view of a state in which a core is placed on a placement portion of a retriever of a retriever according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] (First embodiment) 1 to 13, a first embodiment of the retrieval method, retrieval device, and core retrieval tool will be described. The retrieval device of this embodiment retrieves cores (residues) remaining in a core hole when a horizontally extending core hole (long hole) is formed in a reinforced concrete block (object to be drilled) using a core bit, which is a drilling device. The retrieval device of this embodiment is configured by attaching a retriever instead of the core bit to a drilling device to which a core bit is attached.

[0009] FIG. 1 is a front view of a recovery device 20 of this embodiment, and FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. As shown in FIG. 1, the recovery device 20 of this embodiment has a support frame 21 that is substantially rectangular. This support frame 21 supports a core recovery tool 40, which will be described later. Specifically, the support frame 21 includes frames 22 and 24 that form a rectangular frame, and a frame 23 that connects the corners of these frames. The frame 22 is provided on the drilling side (concrete block side). The frame 24 is disposed parallel to each of the frames 22. The frame 23 is disposed between the frames 22 and 24, extending in a direction perpendicular to them.

[0010] As shown in Figures 1 and 2, the recovery device 20 is provided with a pair (two) of insertion brackets B1 extending parallel to the frame 23. The insertion brackets B1 are hollow rectangular pillars that are open on the frame 24 side. These insertion brackets B1 are used to insert the forks of a forklift when moving the recovery device 20. The insertion brackets B1 are spaced apart so that the center of gravity of the recovery device 20 is located between the forks even when the recovery device 20 is lifted by the forklift.

[0011] 2, a substrate 25 is attached to the frame 22 so as to span the frame 22. A through-hole 25a is formed in the center of the substrate 25. This through-hole 25a has a circular shape large enough to allow the arc-shaped mounting portion 45 of the core retriever 40 to fit loosely therein.

[0012] A roller 28a is rotatably attached via a mounting member 26a to the upper part of the substrate 25. The roller 28a is disposed so as to abut against the outer peripheral surface of the mounting portion 45 of the core retriever 40 when the mounting portion 45 is positioned upward.

[0013] Furthermore, a guide shaft 37a (described later) is fixed via a mounting member 26b to the frame 22 located at the bottom of Fig. 2. Two spaced rollers 28b are rotatably arranged on the guide shaft 37a via a mounting portion. The rollers 28b are positioned opposite the rollers 28a so as to abut against the outer peripheral surface of the mounting portion 45 when the mounting portion 45 is positioned downward.

[0014] The recovery device 20 shown in Fig. 1 includes a core recovery tool 40, a rotation mechanism 35, and a linear motion mechanism 37. The rotation mechanism 35 rotates the core recovery tool 40. The linear motion mechanism 37 moves the core recovery tool 40 linearly forward and backward (left and right directions in Fig. 1).

[0015] The rotation mechanism 35 includes a cylindrical connecting portion 35a, a rotating shaft connected to the connecting portion 35a, a gear (not shown), and a motor 35m. A male thread is formed on the outer periphery of the connecting portion 35a. The motor 35m is a forward / reverse rotating motor, and transmits its rotational force to the core retriever 40 via the connecting portion 35a, causing the core retriever 40 to rotate.

[0016] The linear motion mechanism 37 includes a guide shaft 37a and a movable part 37b. The guide shaft 37a extends parallel to the frame 23 within the support frame 21, and its ends are attached to the frames 22 and 24. The movable part 37b is slidably attached to the guide shaft 37a and moves linearly on the guide shaft 37a using a linear force converted from the rotational force of a built-in motor. The rotation mechanism 35 is attached to this movable part 37b.

[0017] Furthermore, the retrieval device 20 includes a control unit (not shown). The control unit controls the rotation mechanism unit 35 and the linear motion mechanism unit 37. As a result, the control unit moves the core retriever 40 forward, then rotates it, and then moves it backward.

[0018] (Configuration of core recovery tool 40) 3 to 5 are a perspective view, a front view, and a top view of the core retriever 40. FIG. As shown in FIG. 3, the core retriever 40 includes a cylindrical main body 41 with a bottom, a connecting portion 43, and a placing portion 45.

[0019] The main body 41 has a cylindrical body of the same size as a core bit (described later) that forms a core hole. A stepped connecting part 43 is connected to the bottom of the main body 41 on a central axis C1 in one direction. A through hole is formed in the connecting part 43 on the central axis C1. An internal thread is formed on the inner periphery of this through hole. This internal thread is threadedly engaged with a male thread of the connecting part 35a of the rotation mechanism 35, thereby fixing the core retriever 40 to the rotation mechanism 35.

[0020] A mounting portion 45 is connected to the opposite side (tip side) of the connecting portion 43 of the main body portion 41. This mounting portion 45 is configured in a shape with a continuous arc cross section. The cross section of the mounting portion 45 is the same size as the cylindrical main body portion 41 and is configured as an arc of, for example, approximately 150 degrees. A tip portion 45a is formed on the tip side of the mounting portion 45, which is obliquely cut out at an acute angle θ1. In this embodiment, the angle θ1 is, for example, approximately 60 degrees. Therefore, the length L1 of one edge extending in the axial direction of the mounting portion 45 is longer than the length L2 of the other opposing edge, and has approximately the same length as a core bit, which will be described later.

[0021] (Generation of core remaining in core hole) First, the generation of this core will be explained. This core is generated by forming a core hole using a drilling device P1 equipped with a core bit 50 shown in Figure 6. Here, the drilling device P1 used has the core bit 50 attached instead of the core retrieval tool 40 of the retrieval device 20.

[0022] 6, the core bit 50 has a substantially cylindrical shape and includes a main body 51, a bit portion 52 provided at the tip of the main body 51, and a coupling portion 53. The main body 51 has a long cylindrical shape, for example, about 1 m. The main body 51 is formed as a circle having the same size as the arc of the mounting portion 45 of the core retriever 40.

[0023] A plurality of arc-shaped tips (blades) are fixed at intervals to the tip of the bit portion 52 (the end portion on the frame 22 side). In this embodiment, the tips have a shape in which the inner periphery side protrudes more than the outer periphery side. The bit portion 52 is fixed to the main body portion 51 by screwing so that it is replaceable. The coupling portion 53 is connected to the connection portion 35a of the rotation mechanism portion 35 by screwing.

[0024] The drilling device P1 is positioned so that the frame 22 abuts against the side of the concrete block 60. Then, in response to an instruction from the operator, the control unit drives the motor 35m of the rotation mechanism 35 of the drilling device P1 and the motor of the movable part 37b of the linear motion mechanism 37. As a result, the core bit 50 is rotated and moved straight (forward) horizontally (to the left in FIG. 6) from the abutment surface of the concrete block 60 toward the interior, thereby cutting (drilling) a circular shape. When the core bit 50 passes between the rollers 28a, 28b, the rollers 28a, 28b abut against the core bit 50 and rotate in accordance with the rotation of the core bit 50 while supporting the core bit 50.

[0025] Thereafter, when cutting by the core bit 50 is completed, the core bit 50 is retreated while being rotated. As a result, a cylindrical core hole h1 is formed in the concrete block 60, as shown in Fig. 7. In this case, the tip side (left side in Fig. 7) of the core 61 of the core hole h1 is connected to the concrete block 60. In this case, a space S1 having a cylindrical surface shape is formed around the core 61 in the core hole h1.

[0026] 6, a hole h2 extending vertically is formed by drilling from above the concrete block 60. The tip side of the core 61 of the core hole h1 is cut from the concrete block 60 by this hole h2.

[0027] As a result, the core hole h1 becomes a cylindrical space S2 as shown in Fig. 8. Furthermore, the tip side of the core 61 is cut off from the concrete block 60, so that the core 61 is separated from the concrete block 60 and falls. As a result, the bottom surface of the core 61 comes into contact with the concrete block 60 within the core hole h1.

[0028] (Collection method) Next, a method for recovering the core 61 remaining in the core hole h1 will be described. As shown in Figure 9, the retrieval device 20, which is configured by removing the core bit 50 and attaching the core retriever 40, is placed so that the frame 22 abuts against the side of the concrete block 60. In this case, the retrieval device 20 is placed so that the central axis of the core hole h1 coincides with the central axis of the main body 41 of the core retriever 40. Furthermore, the motor 35m of the rotation mechanism 35 is rotated so that the mounting part 45 of the core retriever 40 is positioned upward.

[0029] Then, in response to an instruction from the operator, the control unit drives the motor of the movable part 37b of the linear motion mechanism 37. As a result, the placing part 45 of the core retriever 40 is inserted into the core hole h1 while remaining in the upper position.

[0030] In this case, as shown in FIG. 11(a), the placement portion 45 of the core retriever 40 is inserted into the portion above the core 61 in the space S2 of the core hole h1. Then, as shown in FIG. 10, when almost the entirety of the placing portion 45 is inserted into the core hole h1, the control portion stops the motor of the movable portion 37b, and stops the forward movement of the core retriever 40.

[0031] Next, in response to an instruction from the operator, the control unit rotates the motor 35m of the rotation mechanism 35 of the recovery device 20 by a half rotation. As a result, the mounting portion 45 of the core recovery tool 40 rotates a half rotation (180 degrees) from above along the inner circumferential surface of the core hole h1. In this embodiment, the mounting portion 45 is rotated clockwise so that the tip portion 45a of the mounting portion 45 faces downward.

[0032] 11(b), as the mounting portion 45 rotates, the tip 45a of the mounting portion 45 moves to enter under the core 61. Therefore, within the core hole h1, the core 61 gradually rises and rests on the mounting portion 45.

[0033] 11(c) and 12, when the placing portion 45 has completed a half rotation, the placing portion 45 is positioned downward, and the core 61 is placed on the placing portion 45. Next, in response to an instruction from the operator, the control unit drives the motor of the movable part 37b of the linear motion mechanism 37. This linearly moves the core recovery tool 40 rearward. In this case, the lower surface of the mounting part 45 of the core recovery tool 40 moves while being supported by the rollers 28b.

[0034] Then, when the tip of the mounting portion 45 comes out of the core hole h1, the motor of the movable portion 37b is stopped. In this case, as shown in FIG. 13, the core 61 placed on the placement portion 45 of the core retriever 40 is also pulled out from the core hole h1. Thereafter, a ramp or the like for core recovery leading to a lifting jig or the like is placed next to the mounting portion 45 of the retracted core recovery tool 40. Then, by rotating the core recovery tool 40 with the core 61 placed thereon, the core 61 is dropped onto the ramp or the like. The core 61 is then stored in a lifting jig or the like installed at the end of the ramp or the like. Furthermore, the core 61 stored in the lifting jig or the like is lifted and transported to be recovered into a container or the like.

[0035] (action) The recovery device 20 of this embodiment is provided with a mounting portion 45 for a long object having a continuous arc cross section. After the mounting portion 45 is inserted into the gap above the core 61 in the space S2 of the horizontally extending core hole h1, the mounting portion 45 is rotated. As a result, the mounting portion 45 moves below the core 61 along the axial direction of the outer periphery of the core 61, and the core 61 is placed on the mounting portion 45.

[0036] According to this embodiment, the following effects can be obtained. (1-1) The recovery device 20 of this embodiment includes a core recovery tool 40 having a mounting portion 45. The mounting portion 45 is an elongated object having an arc-shaped cross section that is the same size as the cylindrical shape of the main body 51 of the core bit 50. After the mounting portion 45 is inserted above the core 61 in the space S2 within the core hole h1, the mounting portion 45 is rotated to place the core 61 on the mounting portion 45. Then, the mounting portion 45 on which the core 61 is placed is retracted. As a result, the entire cylindrical core 61 is placed on the mounting portion 45, allowing the core 61 to be efficiently removed from the core hole h1.

[0037] (1-2) In this embodiment, the tip 45a of the mounting portion 45 of the core retriever 40 has a shape that is notched obliquely in one direction. This allows the tip 45a, which is long in the axial direction, to smoothly fit into the side of the core 61 when the core retriever 40 rotates, gradually placing the core 61 on the mounting portion 45. Therefore, the core 61 can be efficiently placed on the mounting portion 45.

[0038] (1-3) In this embodiment, the recovery device 20 is configured by attaching a core recovery tool 40 to a drilling device P1 to which a core bit 50 is attached, instead of the core bit 50. This allows the core 61 to be efficiently recovered using the drilling device P1.

[0039] (Second embodiment) Next, a second embodiment of the retrieval method, retrieval device, and core retriever will be described with reference to Figures 14 to 19. In the retrieval device 70 of this embodiment, a core retriever 80 having a mounting portion with a bifurcated tip is used instead of the core retriever 40 of the first embodiment. In this embodiment, parts similar to those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0040] 14 to 16 are a perspective view, a front view, and a top view of the core retriever 80 used in this embodiment. As shown in FIG. 14, the core retriever 80 includes a cylindrical main body 81 with a bottom, a connecting portion 83, and a placing portion 85, similar to the core retriever 40.

[0041] Like the main body 41 of the core retriever 40, the main body 81 has a cylindrical body of the same size as the core bit 50 that forms the core hole h1. Like the connecting part 43, the connecting part 83 has a through-hole with an external thread formed on the central axis C2. This connecting part 83 screws into the connecting part 35a of the rotation mechanism 35 to fix the core retriever 80 to the rotation mechanism 35.

[0042] A mounting portion 85 is connected to the opposite side (tip side) of the connecting portion 83 of the main body portion 81. The cross section of this mounting portion 85 is the same size as the cylinder of the main body portion 81 and is configured as an arc of, for example, about 170 degrees.

[0043] As shown in Fig. 16, a pair of bifurcated tip portions 85a are formed on the tip side of the mounting portion 85. These tip portions 85a are configured symmetrically with respect to the central axis C2 and are formed by cutting out obliquely at an angle θ2 so that the portion on the central axis C2 is shortest. In this embodiment, the angle θ2 is, for example, approximately 45 degrees. Therefore, the length L3 of both edges extending in the axial direction of the mounting portion 85 is longer than the length L4 on the central axis C2 and is approximately the same length as the core bit 50.

[0044] (Collection method) Next, a method for retrieving a core remaining in a core hole using the retrieval device 70 of this embodiment will be described with reference to FIGS.

[0045] In this embodiment as well, as shown in FIG. 8, the core 61 is disposed in the core hole h1 so as to abut against the lower surface of the core hole h1. 17, the recovery device 70 configured by attaching the core recovery tool 80 is positioned so that the frame 22 abuts against the side of the concrete block 60. Furthermore, in this embodiment, the motor 35m of the rotation mechanism 35 is rotated so that the mounting portion 85 of the core recovery tool 80 is positioned downward.

[0046] Then, the control unit drives the motor of the movable unit 37b of the linear motion mechanism 37 of the recovery device 70. As a result, the mounting portion 85 of the core recovery tool 80 is inserted into the core hole h1 while remaining positioned downward. In this case, the lower surface of the mounting portion 85 of the core recovery tool 80 moves while being supported by the rollers 28b.

[0047] Here, as shown in FIG. 18(a), the pair of tip portions 85a of the mounting portion 85 of the core retriever 80 are inserted into the core 61 from approximately left and right positions in the space S2. 18(b), as the tip portion 85a is gradually inserted, the lower portion of the tip portion 85a becomes larger. As a result, the core 61 is gradually lifted up and placed on the placing portion 85 so that the lower portion of the tip portion 85a enters under the core 61.

[0048] 18(c), when the mounting portion 85 rearward of the tip portion 85a is inserted into the core hole h1, the core 61 is placed on the mounting portion 85. 19, when almost the entirety of the placing portion 85 enters the core hole h1, the control unit stops the motor of the movable portion 37b to stop the forward movement of the core retriever 80. Next, the control unit drives the motor of the movable portion 37b of the linear motion mechanism 37 to move the core retriever 80 linearly backward.

[0049] Thereafter, when the tip of the mounting portion 85 is removed from the core hole h1, the motor of the movable portion 37b is stopped, whereby the core 61 mounted on the mounting portion 85 of the core retriever 80 is also pulled out from the core hole h1.

[0050] (action) The recovery device 70 of this embodiment has a mounting portion 85 with a continuous arc cross section. The mounting portion 85 has bifurcated tip portions 85a at left and right positions of the approximately semicircle. In the space S2 of the core hole h1 extending horizontally, the tip portions 85a are inserted into the gaps on the left and right sides of the core 61, and then the mounting portion 85 is moved straight forward. As a result, the tip portions 85a of the mounting portion 85 enter under the core 61 from the left and right sides of the core 61, and the core 61 is placed on the mounting portion 85.

[0051] According to this embodiment, in addition to the same effect as (1-3) above, the following effect can be obtained. (2-1) The recovery device 70 of this embodiment includes a core recovery tool 80 that includes a mounting portion 85. The mounting portion 85 is an elongated object having an arc-shaped cross section that is the same size as the cylindrical shape of the main body 51 of the core bit 50. After inserting the tip portion 85a of the mounting portion 85 from the left and right portions of the core 61 into the space S2 within the core hole h1, the mounting portion 85 is moved forward to place the core 61 on the mounting portion 85. Then, by moving back the mounting portion 85 on which the core 61 is placed, the core 61 can be efficiently removed from the core hole h1.

[0052] (2-2) In this embodiment, the tip 85a of the mounting portion 85 of the core retriever 80 has a bifurcated shape. This allows the core retriever 80 to enter the core 61 evenly from both the left and right sides, allowing the core 61 to be stably mounted on the mounting portion 85.

[0053] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the first embodiment, the mounting portion 45 of the core retriever 40 has a tip 45a that is cut diagonally in one direction. In the second embodiment, the mounting portion 85 of the core retriever 80 has a bifurcated tip 85a. The shape of the tip of the mounting portion is not limited to this. For example, the tip of the mounting portion may have a shape in which the central axis protrudes at the tip, or may have a shape with an inclined portion along the entire length of the mounting portion (45, 85), or may not have an inclined tip.

[0054] In each of the above embodiments, the mounting portions 45, 85 of the core retrievers 40, 80 have cross sections that are arcs of approximately 150 degrees and approximately 170 degrees, respectively. The cross sections of the arcs of the mounting portions 45, 85 are not limited to these angles (sizes), and may be any size that allows the core 61 to be mounted thereon.

[0055] In the second embodiment, the core retriever 80 is moved forward with the placing portion 85 of the core retriever 80 positioned downward, and the core 61 is placed on the placing portion 85. Even in the retriever 70 using the core retriever 80, the core 61 may be placed on the placing portion 85 in the same manner as in the first embodiment. Specifically, with the placing portion 85 positioned upward, the placing portion 85 is inserted into the core hole h1. Thereafter, the placing portion 85 is rotated to place the core 61 on the placing portion 85.

[0056] In the above embodiments, the retrieval devices 20, 70 are configured by attaching the core retriever 40, 80 to the drilling device instead of the core bit 50. The retrieval device 20 may be configured differently from the drilling device as long as it has a mechanism that allows the core retriever 40 to rotate and move back and forth in a straight line, and the retrieval device 70 may be configured differently from the drilling device as long as it has a mechanism that allows the core retriever 80 to move back and forth in a straight line.

[0057] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (a) The recovery device according to claim 4, characterized in that the placement portion has a forked tip portion with sharp ends.

[0058] (b) A recovery device for recovering a cylindrical core formed and remaining in a core hole formed in a cylindrical shape extending horizontally in a drilling object, the recovery device comprising: a core recovery tool having a mounting portion for placing the core, formed in a shape with a continuous arc cross section corresponding to the size of the core hole; and a linear motion mechanism for moving the rotation mechanism in a straight line, the tip of the mounting portion having a shape inclined in the axial direction.

[0059] (c) The recovery device is characterized in that the core recovery tool is attached to the recovery device instead of the core bit of the drilling device that drills the core hole, and the core bit has a long cylindrical tube portion with a blade at the tip, as described in (a) or (b) of 4. [Explanation of symbols]

[0060] θ1, θ2...angle, B1...insertion bracket, C1, C2...center axis, h1...core hole, h2...hole, P1...drilling device, S1, S2...space, 20, 70...recovery device, 21...support frame, 22, 23, 24...frame, 25...base plate, 25a...through hole, 26a, 26b...mounting member, 28a, 28b...roller, 35...rotation mechanism, 35a...connection part, 35m...motor, 37...linear motion mechanism, 37a...guide shaft, 37b...moving part, 40, 80...core recovery tool, 41, 51, 81...main body, 43, 83...connection part, 45, 85...mounting part, 45a, 85a...tip part, 50...core bit, 52...bit part, 53...coupling part, 60...concrete block, 61...core.

Claims

1. A method for recovering a cylindrical core, which is separated from a drilling object and remains in a cylindrical core hole extending horizontally in the drilling object and in contact with a lower surface of the core hole, using a recovery device, comprising: the retrieval device includes a core retrieval tool having a mounting portion formed in a shape with a continuous arc cross section corresponding to the size of the core hole; After inserting the tip of the mounting portion into the space between the core and the core hole and above the core, The placement portion is advanced until the entire placement portion is inserted into the core hole; The core is placed on the placement portion by rotating the core retriever. A retrieval method comprising: retracting the core retrieval tool while the core is placed on the placement portion, thereby retrieving the core.

2. A method for recovering a cylindrical core, which is separated from a drilling object and remains in a cylindrical core hole extending horizontally in the drilling object and in contact with a lower surface of the core hole, using a recovery device, comprising: the retrieval device includes a core retrieval tool having a mounting portion formed in a shape with a continuous arc cross section corresponding to the size of the core hole; The forked ends of the pair of mounting portions are inserted into the spaces between the core and the core hole, on the left and right sides of the core, The core recovery tool is advanced to place the core on the placement section, A retrieval method comprising: retracting the core retrieval tool while the core is placed on the placement portion, thereby retrieving the core.

3. A recovery device for recovering a cylindrical core that is separated from an object to be drilled and remains in a state of contact with a lower surface of the core hole in a cylindrical core hole that extends horizontally in an object to be drilled, comprising: a core retriever having a mounting portion on which the core is mounted, the mounting portion having a cross section of a continuous arc corresponding to the size of the core hole; a linear motion mechanism for moving the core recovery tool in a straight line, The recovery device is characterized in that the mounting portion has a shape inclined in the axial direction and a pair of bifurcated tips.

4. A core recovery tool provided in a recovery device that recovers a cylindrical core that is separated from a drilling object and remains in a cylindrical core hole that extends horizontally in the drilling object and is in contact with a lower surface of the core hole, a connecting portion that can be connected directly or via another member to a linear motion mechanism that moves the core in the axial direction; a mounting portion formed in a shape having a continuous arc cross section corresponding to the size of the core hole, The core retriever is characterized in that the mounting portion has a pair of bifurcated tips that are inclined in the axial direction.

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