Buried object lifting method and buried object lifting device

Abstract

To suppress a work space.SOLUTION: An embedded object pulling-up method for pulling up an underground embedded object 4 that is embedded underground upward along a prescribed direction includes: an excavation step of excavating a vertical hole 6 extending along the prescribed direction by an auger screw 21; a connection step of connecting the underground embedded object 4 to the auger screw 21 in a state of allowing rotation of the auger screw 21 and restricting downward relative movement of the underground embedded object 4 with respect to the auger screw 21; and a pulling-up step of rotating the auger screw 21 in a state of connected to the underground embedded object 4 and inserted into the vertical hole 6 in a direction opposite to a rotation direction in the excavation step.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a buried object lifting method and a buried object lifting device. [Background technology]

[0002] Patent Document 1 describes a method for pushing up a structure. In this method, a boring machine is used to drill an inclined hole from the outer ground part of a sunken strip footing directly below the strip footing, and an injection pipe for injecting an expansive resin is inserted into the inclined hole. A folded bag is attached to one end of the injection pipe, and a mixing injection device that mixes the various materials of the expansive resin and injects them into the ground is connected to the other end of the injection pipe. When the various materials of the expansive resin are mixed in the mixing injection device and injected into the bag through the injection pipe, the expansive resin expands and solidifies in the bag, pressing against the surrounding ground, and the pressing force is transmitted to the strip footing, pushing up a part of the sunken strip footing upward.

[0003] Patent Document 2 describes a method for lifting a building. In this method, a rotary percussion tool is used to dig at an angle and drill a hole to a position below the foundation on the sloping downward side of the building. Expandable bags are attached to the tips of a water injection pipe and a drainage pipe, and the water injection pipe and drainage pipe are inserted to the drilled position, that is, to the tip of the rotary percussion tool. Water is injected from a water jack through the water injection pipe to expand the bag, and then the water injected into the bag replaces the cement-based solidifying material. The water jack is then used to press in the solidifying material and further expand the bag, allowing the building to be lifted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-37792 A [Patent Document 2] Japanese Patent Application Publication No. 9-158235 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the construction methods of Patent Documents 1 and 2, the work position on the ground is far away from the buried objects that are to be lifted, such as the slab and the building, so there is a possibility that a large work space is required on the ground to include the buried objects and the work position.

[0006] Therefore, an object of the present disclosure is to provide a buried object lifting method and a buried object lifting device that can reduce the working space. [Means for solving the problem]

[0007] In order to solve the above problems, a first aspect of the present invention is a buried object pulling-up method for pulling up a buried object buried in the ground upward along a predetermined direction, the method including: an excavation step of excavating a borehole extending along the predetermined direction with a screw; a connection step of connecting the buried object to the screw in a state in which rotation of the screw is permitted and relative movement of the buried object downward with respect to the screw is restricted; and a pulling-up step of rotating the screw connected to the buried object and inserted into the borehole in a direction opposite to the rotation direction in the excavation step. fruit , The borehole is drilled in a position close to or adjacent to the outer surface of the buried object so as to be parallel to the buried object. .

[0008] A second aspect of the present invention is a buried object lifting method according to the first aspect, wherein in the lifting process, backfill material for the excavation hole is fed into the excavation hole from above while the screw is rotated in a direction opposite to the rotation direction in the excavation process.

[0009] The present invention 3 The above embodiment is 1 In the excavation step, the excavation hole is excavated to a position below a lower end of the buried object.

[0010] The present invention 4The present invention relates to a buried object pulling-up device that pulls up a buried object buried in the ground in a predetermined direction, A trench is excavated in a position close to or adjacent to the outer surface of the buried object so as to be parallel to the buried object. The drilling device comprises a screw capable of drilling a drill hole by rotating in a first direction, and a connecting member that connects the buried object to the screw in a state that allows rotation of the screw and restricts downward relative movement of the buried object with respect to the screw, and the screw is capable of transporting backfill material in the drill hole from above to below the drill hole by rotating in a second direction opposite to the first direction.

[0011] The present invention 5 The above embodiment is 4 The buried object lifting device of this embodiment is provided with a cylindrical outer tube member that defines a screw insertion hole on the inner diameter side and can drill radially outwardly of the excavation hole downward by rotation, and the screw is inserted through the screw insertion hole of the outer tube member.

[0012] The present invention 6 The above embodiment is 4 or the above-mentioned aspect 5 The buried object pulling up device of this aspect is provided with a push-up member capable of pushing up the buried object from the ground side upward when the screw is rotated in the second direction.

[0013] The present invention 7 The above embodiment is 6 In the buried object pulling up device of the aspect 1, the push-up member pushes the connection member upward from the ground side, thereby pushing the buried object upward from the ground side.

[0014] The present invention 8 The above embodiment is 6 The buried object lifting device of this embodiment includes a pushed-up member attached to the buried object, and the pushing-up member pushes the pushed-up member upward from the ground side, thereby pushing the buried object upward from the ground side. Effect of the Invention

[0015] According to the present disclosure, the working space can be reduced. [Brief description of the drawings]

[0016] [Figure 1] 1 is an explanatory diagram of a buried object pulling up device according to a first embodiment of the present invention. [Diagram 2] 2 is an enlarged view of a main part of the buried object pulling up device of FIG. 1. [Diagram 3] 3 is a cross-sectional view taken along the line III-III in FIG. 2, illustrating an example of a connecting member. [Figure 4] FIG. [Diagram 5] FIG. 1 is an explanatory diagram of a buried object pulling up method, in which (a) shows the first step, (b) shows the second step, and (c) shows the third step. [Figure 6] 10 is an explanatory diagram of the buried object pulling up method, where (a) shows the fourth step, (b) shows the fifth step, and (c) shows the sixth step. [Figure 7] FIG. 6 is an explanatory diagram of a buried object pulling up device according to a second embodiment of the present invention. [Figure 8] FIG. 13 is a diagram showing a modified example of the buried object pulling up method, showing the state in which two vertical holes are being excavated. [Figure 9] 13 is a diagram showing a modified example of the buried object pulling up method, showing a manner in which a connecting member is connected to the arm of a heavy machine. FIG. [Figure 10] 13 is a diagram showing a modified example of the buried object pulling up method, showing how the connecting member is lifted by a jack. FIG. [Figure 11] FIG. 13 is a diagram showing a modified example of the buried object pulling up method, in which an underground buried object is directly lifted up with a jack. [Figure 12] FIG. 11 is an explanatory diagram of a buried object pulling up method according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, UP indicates the vertical upward direction. Also, the arc arrows shown in Fig. 5 and Fig. 6 indicate the rotation direction of the auger screw.

[0018] FIG. 1 is an explanatory diagram of a buried object pulling up device 10 according to a first embodiment of the present invention.

[0019] As shown in FIG. 1, a buried object pulling up device 10 according to this embodiment is a device for pulling up an underground buried object (buried object) 4 buried in the ground, and includes an excavation device 1 and a push-up device 30.

[0020] In this embodiment, the underground buried object 4 to be pulled up is an existing pile. The underground buried object 4 has a buried area 4a buried in the ground and an exposed area 4b exposed above ground. The buried area 4a of the underground buried object 4 is buried in the ground along a predetermined direction. In this embodiment, the buried area 4a of the underground buried object 4 is buried in the ground along a vertical direction (predetermined direction). The exposed area 4b of the underground buried object 4 is not limited to an area that has been exposed above ground since before (before the pulling-up work begins). For example, the underground buried object 4 before the pulling-up work begins may be entirely buried in the ground, or may be an area on the upper end side of the underground buried object 4 that is exposed above ground by digging the ground surface when pulling up the underground buried object 4. In this embodiment, the underground buried object 4 is an existing pile, but is not limited thereto. For example, the buried object may be an underground tank buried in the ground.

[0021] As shown in FIG. 1, the drilling device 1 is a device capable of drilling a borehole in the ground, and includes a heavy machine 2 and a rotary lifting device 20.

[0022] The heavy equipment 2 is a machine for driving the rotary lifting device 20, and includes the rotary press-in device 3, a shaft 7 extending downward from the rotary press-in device 3, and a leader 8 supporting the rotary press-in device 3 so that it can slide up and down. The rotary press-in device 3 drives the shaft 7 to rotate.

[0023] FIG. 2 is an enlarged view of a main part of the buried object pulling up device 10 of FIG.

[0024] As shown in FIG. 2, the rotary lifting device 20 includes an auger screw (screw) 21 and a connecting member 22, and is connected to and driven by a heavy machine 2 (see FIG. 1) on which the rotary press-in device 3 is mounted.

[0025] The auger screw 21 is an excavation member capable of excavating a vertical hole (drilling hole) 6 downward from the ground 5, and has a shaft 23, a connecting portion 24, and a plurality of cutting blades 25.

[0026] The shaft 23 of the auger screw 21 is a long member that extends linearly. The shaft 23 has a winged region 23a on one side of a predetermined axial position (lower side in Figs. 1 and 2) and a wingless region 23b on the other side of the predetermined position (upper side in Figs. 1 and 2). The winged region 23a of the shaft 23 is a region where cutting blades 25 are provided, and the wingless region 23b of the shaft 23 is a region where cutting blades 25 are not provided. The shaft 23 has a sharp tip 23c on one axial side. In this embodiment, the sharp tip 23c is provided on one axial side of the shaft 23, but an auger head may be provided instead of the sharp tip 23c.

[0027] The cutting blades 25 of the auger screw 21 are each integrally provided in a spiral shape on the outer circumferential surface of the bladed region 23a of the shaft 23. The cutting blades 25 are provided at positions spaced apart from each other in the axial direction of the shaft 23. The cutting blades 25 are formed so that when the auger screw 21 is rotated in a first direction (e.g., clockwise as viewed from the other axial side), the cutting blades 25 transport the soil to the other axial side (upper side in Figs. 1 and 2), and when the auger screw 21 is rotated in a second direction opposite to the first direction (e.g., counterclockwise as viewed from the other axial side), the cutting blades 25 transport the soil to one axial side (lower side in Figs. 1 and 2). In this embodiment, the cutting blades 25 are provided spaced apart from each other in the axial direction of the shaft 23, but this is not limited thereto, and one cutting blade 25 may be provided continuously over the entire axial area of ​​the bladed region 23a of the shaft 23.

[0028] The connecting part 24 of the auger screw 21 is provided integrally with the other axial end of the shaft 23 (the end on the side of the bladeless region 23b), and is connected to the lower end of the shaft 7 on the rotary press-fitting device 3 side of the heavy machine 2. The auger screw 21 is used suspended from the rotary press-fitting device 3 side with the connecting part 24 connected to the lower end of the shaft 7 on the rotary press-fitting device 3 side of the heavy machine 2. Torque from the rotary press-fitting device 3 side of the heavy machine 2 is transmitted to the auger screw 21 via the shaft 7.

[0029] When the auger screw 21 is used to excavate the vertical hole 6 downward from the ground 5, the rotary press-in device 3 of the heavy equipment 2 is driven with the tip 23c of the shaft 23 of the auger screw 21 in contact with the ground 5 from above, to rotate the auger screw 21 in the first direction. When the auger screw 21 is rotated, the rotary press-in device 3 moves downward along the leader 8 due to the weight of the rotary press-in device 3, the shaft 7, and the auger screw 21, while the auger screw 21 excavates the vertical hole 6 while transporting soil upward. Figures 1 and 2 show a state in which the vertical hole 6 has been excavated by the auger screw 21. The shape of the auger screw 21 is not limited to the above, and various shapes can be applied as long as the shape is capable of excavating the vertical hole 6 when rotated in the first direction and transporting soil 29 downward when rotated in the second direction.

[0030] FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

[0031] As shown in Figures 2 and 3, the connecting member 22 is a member that connects the auger screw 21 inserted into the vertical hole 6 to the underground buried object 4 (in this embodiment, the exposed area 4b), and has a first support portion 26 that supports the underground buried object 4 and a second support portion 27 that rotatably supports the auger screw 21.

[0032] The first support part 26 of the connection member 22 is attached to the exposed area 4b of the underground buried object 4 to support the underground buried object 4. When the first support part 26 is attached to the exposed area 4b of the underground buried object 4, its upward movement with respect to the underground buried object 4 is restricted. For example, the first support part 26 has two tilting parts 26a whose one end side is rotatably supported as an axis and whose other end side is tiltable. The two tilting parts 26a are formed in a belt shape and extend in the circumferential direction along the outer surface (in this embodiment, the outer peripheral surface) of the exposed area 4b of the underground buried object 4. The first support part 26 is attached to the exposed area 4b of the underground buried object 4 by fastening the tip sides of the two tilting parts 26a with fastening members (for example, bolts 9a and nuts 9b). A stopper may be fixed to a position of the underground buried object 4 adjacent to the first support portion 26 from above, and the stopper may restrict the upward movement of the connecting member 22 relative to the underground buried object 4. In addition, in this embodiment, the first support portion 26 of the connecting member 22 is directly attached to the underground buried object 4, but this is not limited to this, and the connecting member 22 may be indirectly attached to the underground buried object 4 via another member.

[0033] The second support portion 27 of the connection member 22 is attached to the auger screw 21 (in this embodiment, the bladeless region 23b) to support the auger screw 21. When attached to the auger screw 21, the second support portion 27 allows the auger screw 21 to rotate, but restricts downward movement relative to the auger screw 21. For example, the second support portion 27 has two tilting portions 27a whose one end side is rotatably supported as an axis and whose other end side is tiltable. The two tilting portions 27a are formed in a belt shape and extend in the circumferential direction of the auger screw 21 with a bearing 28 interposed between the two tilting portions 27a and the outer circumferential surface of the auger screw 21. The second support portion 27 is attached to the auger screw 21 by fastening the tip sides of the two tilting portions 27a with fastening members (for example, bolts 9a and nuts 9b). A stopper may be fixed to the auger screw 21 at a position adjacent to the second support portion 27 from below, and the stopper may restrict the downward movement of the connection member 22 relative to the auger screw 21. In addition, in the present embodiment, the second support portion 27 of the connection member 22 is attached to the auger screw 21, but this is not limited to this, and the connection member 22 may be indirectly attached to the auger screw 21 via another member. In other words, the connection member 22 is not limited to being directly attached to each of the underground buried object 4 and the auger screw 21. The connection member 22 may be any member that connects the buried object to be pulled up (the underground buried object 4 in this embodiment) and the screw (the auger screw 21 in this embodiment) that is the member that pulls up the buried object in a state that allows the screw to rotate and restricts the movement of the buried object downward relative to the screw.

[0034] FIG. 4 is a plan view of the push-up device 30. As shown in FIG.

[0035] As shown in FIG. 4, the push-up device 30 has a buried object support member (a member to be pushed up) 31 and a plurality of jacks (push-up members) 32 (four in this embodiment).

[0036] The buried object support member 31 is a member that is disposed above the ground 5 and supports the underground buried object 4. In this embodiment, the buried object support member 31 is formed by combining four rod-shaped members 33a to 33d in a grid pattern and is fixed to the exposed area 4b of the underground buried object 4. In this embodiment, the buried object support member 31 is disposed at a height position above the connection member 22 and fixed to the underground buried object 4. The two rod-shaped members 33a and 33b are disposed parallel to each other and extend in a substantially horizontal direction. The rod-shaped members 33a and 33b are fixed to the underground buried object 4 while sandwiching the underground buried object 4 from both sides in a direction intersecting with the vertical direction. The other two rod-shaped members 33c and 33d are disposed parallel to each other and extend in a substantially horizontal direction in a direction intersecting with the rod-shaped members 33a and 33b. The rod-shaped members 33c and 33d are fixed to the underground buried object 4 and the rod-shaped members 33a and 33b in a state in which the underground buried object 4 is sandwiched from both sides in a direction intersecting with the up-down direction. The buried object support member 31 is fixed to the underground buried object 4, so that its upward movement with respect to the underground buried object 4 is restricted. A stopper may be fixed to a position of the underground buried object 4 adjacent to the buried object support member 31 from above, and the upward movement of the buried object support member 31 with respect to the underground buried object 4 may be restricted by the stopper. In addition, in this embodiment, the buried object support member 31 has a shape of a grid, but is not limited thereto, and various shapes can be applied. For example, the buried object support member 31 may have a shape of a ring surrounding the underground buried object 4.

[0037] The multiple jacks 32 are members that can expand and contract in the vertical direction, and can push up the buried object 4 from the ground 5 side via the buried object support member 31. The jacks 32 are arranged along the vertical direction between the ground 5 and the lower surfaces of both ends of the rod-shaped members 33c and 33d. That is, in this embodiment, the multiple jacks 32 can push up the buried object support member 31 along the vertical direction (the above-mentioned predetermined direction). The lower ends of the jacks 32 are supported from the ground 5 side. The upper ends of the jacks 32 support both ends of the rod-shaped members 33c and 33d from below. The four jacks 32 are arranged so that the buried object 4 is located at the center of the diagonal line. That is, the jacks 32 located diagonally out of the four jacks 32 are arranged on both sides of the buried object 4 (both sides in the direction intersecting the vertical direction). Various jacks such as a hydraulic jack, an air jack, a mechanical jack, etc. may be used as the jack 32. Other members may be interposed between the buried object support member 31 or the ground 5 and the jack 32. The number of jacks 32 to be installed is not limited to four.

[0038] Figures 5 and 6 are explanatory diagrams of the buried object lifting method, with Figure 5(a) showing the first step, Figure 5(b) showing the second step, Figure 5(c) showing the third step, Figure 6(a) showing the fourth step, Figure 6(b) showing the fifth step, and Figure 6(c) showing the sixth step.

[0039] The buried object pulling-up method according to this embodiment is a method for pulling up an underground buried object 4 upward, and includes first to sixth steps.

[0040] As shown in FIG. 5(a), in the first step (excavation step), a vertical hole 6 is excavated at a position close to the outer surface of the underground buried object 4 by the auger screw 21 of the rotary lifting device 20 of the excavation device 1. Specifically, in a state where the tip 23c of the shaft 23 of the auger screw 21 is abutted at a position close to the underground buried object 4 on the ground 5, the rotary press-in device 3 (see FIG. 1) of the heavy equipment 2 is driven to rotate the auger screw 21 in a first direction. The auger screw 21 rotating in the first direction cuts the soil of the ground 5, and enters the ground below while transporting the soil (backfill material) 29 upward by the cutting blade 25, thereby excavating the vertical hole 6. In this embodiment, one vertical hole 6 is excavated by one auger screw 21. The depth of the vertical hole 6 is excavated to a position below the lower end of the underground buried object 4 so that the underground buried object 4 is included within a range above a virtual line VL whose rising angle θ from the horizontal line HL at the height position of the lower end of the vertical hole 6 is 45 degrees (see FIG. 2). That is, the depth L1 of the vertical hole 6 below the lower end of the underground buried object 4 (the distance L1 along the above-mentioned specified direction between the lower end of the underground buried object 4 and the bottom of the vertical hole 6) has at least a length L2 required to include the underground buried object 4 within the above-mentioned range when the vertical hole 6 is in close contact with the underground buried object 4. The length L2 required to include the underground buried object 4 within the above-mentioned range when the vertical hole 6 is in close contact with the underground buried object 4 is the length (horizontal length) L2 of the underground buried object 4 in the direction intersecting the above-mentioned specified direction. The soil 29 generated when the vertical hole 6 is excavated is used as a backfilling material capable of backfilling the vertical hole 6 in the pulling-up process described later.

[0041] As shown in FIG. 5(b), in the second step (connection step), the underground buried object 4 is connected to the auger screw 21 by the connection member 22 in a state in which the rotation of the auger screw 21 is permitted and the downward movement of the underground buried object 4 relative to the auger screw 21 is restricted. Specifically, the first support portion 26 of the connection member 22 is attached to the exposed region 4b of the underground buried object 4. In addition, the second support portion 27 of the connection member 22 is attached via a bearing 28 to the wingless region 23b of the auger screw 21 in a state in which the underground buried object 4 is inserted into the vertical hole 6. In the connected state in which the underground buried object 4 and the auger screw 21 are connected by the connection member 22, the upward movement of the first support portion 26 of the connection member 22 relative to the underground buried object 4 is restricted. In addition, in the connected state, the downward movement of the second support portion 27 of the connection member 22 relative to the auger screw 21 is restricted. As a result, the connection member 22 restricts downward movement of the ground buried object 4 relative to the auger screw 21. In other words, when the auger screw 21 moves upward, an upward force acts on the ground buried object 4 via the connection member 22.

[0042] As shown in Fig. 5(c), in the third step (attaching step), the buried object support member 31 of the push-up device 30 is attached to the underground buried object 4. The buried object support member 31 is a member that can be pushed up from the ground 5 side by a plurality of jacks 32. With the buried object support member 31 fixed to the underground buried object 4, the buried object support member 31 is restricted from moving upward relative to the underground buried object 4.

[0043] As shown in FIG. 6(a), in the fourth step (pulling up step), the auger screw 21 is rotated in the second direction. In this embodiment, the buried object support member 31 of the push-up device 30 is pushed up from the ground 5 side by a plurality of jacks 32, while the auger screw 21 is rotated in the second direction. When the auger screw 21 is rotated in the second direction, the soil 29 in the vertical hole 6 is transported downward in the vertical hole 6 by the cutting blade 25. When the soil 29 is transported downward in the vertical hole 6 and the lower part of the vertical hole 6 is backfilled with the soil 29, the auger screw 21 moves upward relative to the vertical hole 6 due to the pressure from the soil 29. When the auger screw 21 moves upward, an upward force acts on the underground buried object 4 via the connection member 22, and the underground buried object 4 is pulled upward together with the auger screw 21. When the underground buried object 4 is pulled upward, a space 35 is generated below the underground buried object 4. That is, in the buried object lifting device 10 of this embodiment, with the auger screw 21 and the underground buried object 4 connected by the connecting member 22 of the buried object lifting device 10, the underground buried object 4 is pushed upward by the jack 32 of the pushing device 30, and the auger screw 21 is rotated in the second direction to transport the soil 29 in the vertical hole 6 from the top to the bottom of the vertical hole 6.

[0044] As shown in FIG. 6(b), in the fifth step (pulling up step), the auger screw 21 is rotated in the second direction while feeding the soil 29 into the vertical hole 6 from the upper opening thereof. This causes the auger screw 21 to rise further, and the buried object 4 is further pulled upward. When the auger screw 21 is rotated in the second direction to apply pressure to the soil 29 below the vertical hole 6, the soil 29 spreads to a range above the virtual line VL and flows from the vertical hole 6 into the space 35 below the buried object 4, and the space 35 is backfilled with the soil 29 (see FIG. 6(b)). The soil 29 transported downward by the auger screw 21 may be fed into the vertical hole 6 from the upper opening thereof by an operator or by a device.

[0045] As shown in FIG. 6(c), in the sixth step, the rotation of the auger screw 21 is stopped, the connection member 22 is removed from the underground buried object 4 and the auger screw 21, and the connection member 22 is attached to the underground buried object 4 and the auger screw 21 at a position lower than the position where it was attached in the second step. In addition, the buried object support member 31 of the lifting device 30 is removed from the underground buried object 4, and the buried object support member 31 is attached to the underground buried object 4 at a position lower than the position where it was attached in the third step. Thereafter, by repeating the fourth to sixth steps, the underground buried object 4 can be pulled further upward while the space 35 below the underground buried object 4 is backfilled with soil 29.

[0046] In the above configuration, the vertical hole 6 is excavated along the direction in which the underground buried object 4 is buried (the above-mentioned predetermined direction), so unlike the case in which the vertical hole 6 is excavated at an angle to the direction in which the underground buried object 4 is buried, the vertical hole 6 can be excavated in a position close to the underground buried object 4. Therefore, the working space required for the work of pulling up the underground buried object 4 can be reduced.

[0047] Furthermore, since the vertical hole 6 is excavated in a position close to the underground buried object 4, the working space required for pulling up the underground buried object 4 can be reliably reduced.

[0048] In addition, since the underground buried object 4 and the auger screw 21 are connected by the connecting member 22 and the underground buried object 4 is pulled upward together with the auger screw 21 by moving the auger screw 21 upward, there is no need to separate the auger screw 21 from the underground buried object 4. Therefore, the vertical hole 6 can be excavated in a position close to the underground buried object 4, and the working space required for the work of pulling up the underground buried object 4 can be reduced.

[0049] Therefore, according to this embodiment, the working space required for the work of pulling up the underground buried object 4 can be reduced.

[0050] Furthermore, the auger screw 21 is rotated in a direction (second direction) opposite to the rotation direction (first direction) in the excavation step (first step) while the connecting member 22 restricts downward movement of the underground buried object 4 relative to the auger screw 21. Therefore, the auger screw 21 is moved upward with respect to the vertical hole 6 by the pressure from the earth and sand 29 moving downward, and the underground buried object 4 can be pulled upward.

[0051] Since the vertical hole 6 extends along the direction in which the underground buried object 4 is buried (the above-mentioned predetermined direction), the movement direction of the auger screw 21 is the direction in which the underground buried object 4 is buried. Therefore, when the auger screw 21 is moved upward, a force can be efficiently transmitted from the auger screw 21 side to the underground buried object 4, and the underground buried object 4 can be pulled upward.

[0052] In addition, since the vertical hole 6 is excavated below the lower end of the underground buried object 4, the space 35 generated below the underground buried object 4 can be brought close to or communicated with the vertical hole 6. Therefore, by rotating the auger screw 21 in the second direction to apply pressure to the soil 29 below the vertical hole 6, the soil 29 can be poured from the vertical hole 6 into the space 35 below the underground buried object 4, and the space 35 can be backfilled with the soil 29. As a result, even if a space 35 is generated below the underground buried object 4 when the underground buried object 4 is pulled upward, it is backfilled with the soil 29, so that loosening of the ground around the underground buried object 4 can be suppressed.

[0053] In addition, when the auger screw 21 is rotated in the second direction to apply pressure to the soil 29 below the vertical hole 6, the soil 29 is likely to spread to a range above the virtual line VL. In this embodiment, the depth L1 of the vertical hole 6 below the lower end of the underground buried object 4 has at least a length (horizontal length) L2 of the underground buried object 4 in a direction intersecting the above-mentioned predetermined direction, and is set so as to include the underground buried object 4 within a range above the virtual line VL. Therefore, the soil 29 spreading to a range above the virtual line VL pushes up the underground buried object 4 from below, and the space 35 generated below the underground buried object 4 can be backfilled. As a result, even if a space 35 is generated below the underground buried object 4 when the underground buried object 4 is pulled up, it is backfilled by the soil 29, so that loosening of the ground around the underground buried object 4 can be suppressed.

[0054] In addition, the underground buried object 4 is pushed up from the ground 5 side by the jack 32 while the auger screw 21 is rotated in the second direction, so that the underground buried object 4 can be pulled up by both the force from the auger screw 21 side and the force from the jack 32.

[0055] In addition, since the buried object support member 31 that can be pushed up from the ground 5 side by the jack 32 is attached to the underground buried object 4, even if the underground buried object 4 does not have a part that can be directly pushed up by the jack 32, the underground buried object 4 can be pushed up from the ground 5 side by the jack 32.

[0056] In addition, since the jack 32 pushes up the buried object support member 31 from the ground 5 side along the above-mentioned specified direction, the force from the jack 32 can be efficiently transmitted to the underground buried object 4, thereby pulling the underground buried object 4 upward.

[0057] Moreover, the diagonally positioned jacks 32 out of the four jacks 32 are arranged on both sides in a direction intersecting with the vertical direction of the underground buried object 4. In other words, since the multiple jacks 32 are arranged on both sides in a direction intersecting with the above-mentioned predetermined direction of the underground buried object 4, the force from the multiple jacks 32 can be efficiently transmitted to the underground buried object 4, and the underground buried object 4 can be pulled upward.

[0058] In addition, since the underground buried object 4 is pushed upward by a plurality of jacks 32, the underground buried object 4 can be pushed upward with a strong force, unlike when it is pushed up by a single jack 32.

[0059] In addition, since the vertical hole 6 is excavated in the vertical direction, the auger screw 21 can be made to be perpendicular to the substantially horizontal ground. Therefore, unlike a case in which the auger screw 21 is inclined relative to the ground, even if the tip of the auger screw 21 (tip portion 23c of the shaft 23) reaches hard ground underground during excavation, the tip of the auger screw 21 is unlikely to escape from the surface of the hard ground, thereby improving the workability of the excavation work.

[0060] Furthermore, since the vertical hole 6 extends in the vertical direction, when the auger screw 21 is rotated in the second direction to transport the soil 29 downward in the vertical hole 6, the soil 29 can be easily transported downward.

[0061] Next, a second embodiment of the present invention will be described with reference to the drawings. The buried object lifting device 40 of this embodiment differs from the first embodiment in that it has an outer tubular member 52. Note that the same components as those of the first embodiment are given the same reference numerals and their description will be omitted.

[0062] FIG. 7 is an explanatory diagram of a buried object pulling up device 40 according to this embodiment.

[0063] As shown in Fig. 7, the buried object lifting device 40 according to this embodiment is a device for lifting up an underground buried object (buried object) 4 buried in the ground, and includes an excavation device 1 (see Fig. 1) and a push-up device 30. The excavation device 1 is a device capable of drilling a borehole in the ground, and includes a heavy machine 2 and a rotary lifting device 50.

[0064] The rotary lifting device 50 includes an auger screw (screw) 51 , a connecting member 22 , and an outer cylinder member 52 .

[0065] The auger screw 51 is an excavation member capable of excavating a vertical hole (drilling hole) 6 downward from the ground 5, and has a shaft 53, a cutting blade 55, and an auger head 56. The shaft 53 is a long member extending in a straight line. A connecting part (not shown) that is connected to the rotary pressing device 3 side of the heavy equipment 2 is provided on the upper end side of the shaft 53. The auger head 56 is provided on the tip (lower end) side of the shaft 53. The cutting blade 55 is integrally provided in a spiral shape on the outer circumferential surface of the shaft 53. The cutting blade 55 is formed so that when the auger screw 51 is rotated in a first direction, the cutting blade 55 transports soil upward, and when the auger screw 51 is rotated in a second direction, the cutting blade 55 transports soil downward. The auger screw 51 is supported by the leader 8 of the heavy equipment 2 so as to be slidable in the vertical direction. The shape of the auger screw 51 is not limited to the above, but may be any shape that is capable of excavating a vertical hole 6 when rotated in a first direction and capable of transporting soil 29 downward when rotated in a second direction.

[0066] The outer tube member 52 is a long excavation member having a cylindrical shape (cylindrical shape in this embodiment), and defines a screw insertion hole 58 for inserting the auger screw 51 on the radially inner side (inner diameter side). The upper end of the outer tube member 52 is connected to a motor 57 provided in the heavy equipment 2 of the excavation device 1. The outer tube member 52 is rotatable by the driving force of the motor 57. That is, in this embodiment, the outer tube member 52 is rotatable independently of the auger screw 51. The outer tube member 52 is supported by the leader 8 of the heavy equipment 2 so as to be slidable in the vertical direction. A digging blade 59 is provided on the lower end of the outer tube member 52 along the circumferential direction. The digging blade 59 can dig the radially outer side of the vertical hole 6 downward by the rotation of the outer tube member 52. The outer tube member 52 is supported by the auger screw 51 in a state in which the downward relative movement with respect to the auger screw 51 is restricted. That is, when the auger screw 51 moves upward, the outer cylinder member 52 moves upward together with the auger screw 51. The axial length of the outer cylinder member 52 is set to be longer than the depth of the vertical hole 6. The outer cylinder member 52 and the auger screw 51 may rotate integrally. In FIG. 7, a part of the outer cylinder member 52 is shown in partial cross section.

[0067] In the buried object pulling-up method according to the embodiment, in the first step (excavation step), a vertical hole 6 is excavated at a position close to the outer surface of an underground buried object 4 by both excavation members, the auger screw 51 and the outer tubular member 52 of the excavation device 1. In this embodiment, one vertical hole 6 is excavated by one set of the auger screw 51 and the outer tubular member 52. The outer tubular member 52 is rotated by the driving force of the motor 57 of the heavy equipment 2. The vertical hole 6 is excavated to a position below the bottom end of the underground buried object 4 so that the underground buried object 4 is included within a range above an imaginary line VL having a rise angle θ of 45 degrees from the horizontal line HL at the height position of the bottom end of the vertical hole 6. That is, the depth L1 of the vertical hole 6 below the lower end of the underground buried object 4 (the distance L1 along the above-mentioned specified direction between the lower end of the underground buried object 4 and the bottom of the vertical hole 6) has at least the length L2 required to include the underground buried object 4 within the above-mentioned range when the vertical hole 6 is in close contact with the underground buried object 4. The length L2 required to include the underground buried object 4 within the above-mentioned range when the vertical hole 6 is in close contact with the underground buried object 4 is the length L2 of the underground buried object 4 in the direction intersecting the above-mentioned specified direction (horizontal length).

[0068] In the second step (connecting step), the underground buried object 4 is connected to the auger screw 51 by the connecting member 22 in a state in which the rotation of the auger screw 51 is permitted and the downward movement of the underground buried object 4 relative to the auger screw 51 is restricted. Specifically, the underground buried object 4 and the outer tubular member 52 are connected by the connecting member 22. In the connected state in which the underground buried object 4 and the outer tubular member 52 are connected by the connecting member 22, the upward movement of the first support portion 26 of the connecting member 22 relative to the underground buried object 4 is restricted. In the connected state, the downward movement of the second support portion 27 of the connecting member 22 relative to the outer tubular member 52 is restricted. The outer tubular member 52 is supported by the auger screw 51 in a state in which the downward relative movement of the outer tubular member 52 relative to the auger screw 51 is restricted. As a result, the connecting member 22 restricts the downward movement of the underground buried object 4 relative to the auger screw 51. That is, in this embodiment, the connection member 22 connects the underground buried object 4 to be pulled up and the outer tubular member 52 on the auger screw 51 side, which is the member that pulls up, in a state that allows rotation of the auger screw 51 and restricts downward movement of the underground buried object 4 relative to the auger screw 51. When the auger screw 51 moves upward, an upward force acts on the underground buried object 4 via the outer tubular member 52 and the connection member 22. Note that in this embodiment, the outer tubular member 52 and the underground buried object 4 are connected by the connection member 22, but this is not limited thereto, and the auger screw 51 and the underground buried object 4 may also be connected by the connection member 22.

[0069] In the third step (attaching step), the buried object support member 31 of the push-up device 30 is fixed to the underground buried object 4 in the same manner as in the first embodiment.

[0070] In the fourth step (pulling up step), the auger screw 51 is rotated in the second direction. When the auger screw 51 is rotated in the second direction, the soil 29 is transported downward inside the screw insertion hole 58 of the outer tubular member 52 by the cutting blades 55 of the auger screw 51. When the soil 29 is transported downward in the vertical hole 6, the auger screw 51 moves upward relative to the vertical hole 6, similar to the first embodiment. When the auger screw 51 moves upward, an upward force acts on the underground buried object 4 via the outer tubular member 52 and the connecting member 22, and the underground buried object 4 is pulled upward together with the auger screw 51. That is, in the buried object lifting device 40 of this embodiment, with the outer tube member 52 and the underground buried object 4 connected by the connecting member 22 of the rotary lifting device 50, the underground buried object 4 is pushed upward by the jack 32 of the pushing-up device 30, and the auger screw 51 is rotated in the second direction to transport the soil 29 in the vertical hole 6 from the top to the bottom of the vertical hole 6.

[0071] In the fifth step (pulling up step), the soil 29 is fed into the screw insertion hole 58 (into the vertical hole 6) from the upper opening of the outer tubular member 52 (see the outline arrow in FIG. 7) while rotating the auger screw 51 in the second direction. This causes the auger screw 51 to rise further, and the underground buried object 4 is pulled further upward. When the auger screw 51 is rotated in the second direction to apply pressure to the soil 29 below the vertical hole 6, the soil 29 spreads to an area above the virtual line VL and flows from the vertical hole 6 into the space (not shown) below the underground buried object 4, and the space is backfilled with the soil 29.

[0072] In a sixth step, the rotation of the auger screw 51 and the outer cylinder member 52 is stopped, and the attachment position of the connection member 22 is moved downward. Thereafter, the fourth to sixth steps are repeated.

[0073] In the above configuration, the underground buried object 4 and the outer cylinder member 52 are connected by the connecting member 22, and the underground buried object 4 is pulled upward together with the auger screw 51 by moving the auger screw 51 upward, so there is no need to separate the auger screw 51 from the underground buried object 4. Therefore, the vertical hole 6 can be excavated in a position close to the underground buried object 4, so that the working space required for the work of pulling up the underground buried object 4 can be reduced.

[0074] Therefore, according to this embodiment, the working space required for the work of pulling up the underground buried object 4 can be reduced.

[0075] In the fourth step, the soil 29 is transported downward in the screw insertion hole 58 of the outer tubular member 52 by the cutting blade 55 of the auger screw 51. That is, the soil 29 moves in the screw insertion hole 58 defined by the outer tubular member 52, so that even if there is loose ground such as a water vein in the ground, the soil 29 can be transported to the desired depth without being dispersed by water or the like. Therefore, even if there is loose ground in the ground, the soil 29 can be transported downward suitably, and the space 35 and the vertical hole 6 generated below the underground buried object 4 can be backfilled.

[0076] In the first and second embodiments, the soil 29 generated when the vertical hole 6 is excavated is used as the backfill material, but the backfill material is not limited to this. For example, liquefied treated soil, which is artificially made by mixing construction waste soil with water and cement, may be used as the backfill material.

[0077] In the first and second embodiments, the direction in which the underground buried object 4 is buried (the above-mentioned predetermined direction) is the vertical direction, but is not limited thereto and may be inclined with respect to the vertical direction, for example. Even in this case, in the first step, the vertical hole 6 is excavated along the above-mentioned predetermined direction in which the underground buried object 4 is buried.

[0078] In the first and second embodiments, the vertical hole 6 is excavated to a position lower than the lower end of the underground buried object 4, but the present invention is not limited to this.

[0079] In the first and second embodiments, the vertical hole 6 is excavated in a position close to the underground buried object 4, but the present invention is not limited to this, and for example, the vertical hole 6 may be excavated in a position adjacent to the underground buried object 4. In this case, when the auger screw 21, 51 is rotated in the second direction, the soil 29 easily flows from the vertical hole 6 into the space 35 below the underground buried object 4, and the space 35 can be easily backfilled with the soil 29.

[0080] Furthermore, in the above first and second embodiments, the buried object lifting device 10, 40 is a buried object lifting device 10, 40 that includes an excavation device 1 and a push-up device 30, but is not limited to this and may at least be equipped with the auger screw (screw) 21, 51 and connecting member 22 of the rotary lifting device 20, 50.

[0081] Furthermore, in the above first and second embodiments, the first to sixth steps are performed and then the fourth to sixth steps are repeated, but this is not limited to the above. For example, if the underground buried object 4 can be pulled up to a sufficient height in one pulling, the first step (excavation step) to the fourth step (pulling up step) or the fifth step (pulling up step) may be performed.

[0082] In addition, in the first and second embodiments described above, the third step (attachment step) is performed after the second step (connection step), but this is not limited to this, and for example, the attachment step (the third step in this embodiment) may be performed before the connection step (the second step in this embodiment).

[0083] In the first and second embodiments, the buried object lifting devices 10, 40 include the push-up device 30, but are not limited thereto, and may include at least the rotary lifting device 20, 50. In this buried object lifting method, after the first step (excavation step) and the second step (connection step), the fourth step (lifting step) is performed without performing the third step (attachment step).

[0084] Furthermore, in the first and second embodiments, one vertical hole 6 is excavated in the first step (excavation step), but multiple vertical holes 6 may be excavated by multiple auger screws 21 (or multiple sets of auger screws 51 and outer tubular member 52). In this case, the underground buried object 4 can be pulled up by the force from the multiple auger screws 21 (or multiple sets of auger screws 51 and outer tubular member 52), so that the underground buried object 4 can be easily pulled up.

[0085] FIG. 8 is a diagram showing a modified example of the buried object pulling up method, showing the state in which two vertical holes 6 are being excavated.

[0086] For example, in the buried object pulling-up method shown in FIG. 8, in the first step (excavation step), a plurality of (two in FIG. 8) vertical holes 6 are excavated by a plurality of (two in FIG. 8) auger screws 21. In this case, it is preferable to excavate the two vertical holes 6 on both sides of the underground buried object 4 in the direction intersecting with the above-mentioned predetermined direction and at a position close to the underground buried object 4. The depths of the two vertical holes 6 are set to be approximately the same. The depths of the two vertical holes 6 are excavated to a position below the bottom end of the underground buried object 4 so that the underground buried object 4 is included within at least one of the ranges above the imaginary line VL where the rise angle θ from the horizontal line HL at the height position of the bottom end of one of the vertical holes 6 is 45 degrees, and the range above the imaginary line VL where the rise angle θ from the horizontal line HL at the height position of the bottom end of the other vertical hole 6 is 45 degrees. That is, the depth L1 of each vertical hole 6 below the lower end of the underground buried object 4 (the distance L1 along the above-mentioned specified direction between the lower end of the underground buried object 4 and the bottom of the vertical hole 6) has at least the length L3 required to include the underground buried object 4 within at least one of the ranges when two vertical holes 6 are excavated on both sides of the underground buried object 4 and in close contact with the underground buried object 4. When two vertical holes 6 are excavated on both sides of the underground buried object 4 and in close contact with the underground buried object 4, the length L3 required to include the underground buried object 4 within at least one of the ranges is half the length L2 of the underground buried object 4 in the direction intersecting the above-mentioned specified direction (horizontal length). In this configuration, when the auger screw 21 is rotated in the second direction to apply pressure to the soil 29 below the vertical hole 6, the soil 29 tends to spread above the virtual line VL, so that the soil 29 spreading above the virtual line VL pushes up the underground buried object 4 from below and backfills a space (not shown) that occurs below the underground buried object 4. As a result, even if a space occurs below the underground buried object 4 when the underground buried object 4 is pulled upward, it is backfilled by the soil 29, so that loosening of the ground around the underground buried object 4 can be suppressed.

[0087] In the first and second embodiments, the excavation member (auger screw 21, 51 or outer cylinder member 52) and the ground buried object 4 are connected by the connecting member 22 in the second step (connecting step), but the present invention is not limited to this. In the second step, the ground buried object 4 to be pulled up and the auger screw 21, 51 which is the member for pulling up may be connected in a state that permits rotation of the auger screw 21, 51 and restricts downward movement of the ground buried object 4 relative to the auger screw 21, 51. In other words, the ground buried object 4 may be connected by the connecting member 22 to the excavation member or a portion of the excavation device 1 that can move up and down together with the excavation member.

[0088] For example, as shown in FIG. 9, the heavy equipment 2 of the excavation device 1 has an arm 62 that supports an excavation member (the auger screw 21 in FIG. 9). The arm 62 tilts up and down with the up and down movement of the auger screw 21. That is, when the auger screw 21 moves upward, the arm 62 also tilts upward. In the second step (connecting step), a part of the arm 62 located above the underground buried object 4 is connected to the underground buried object 4 by a connecting member 61 (for example, a chain). The connecting member 61 restricts the relative movement of the underground buried object 4 downward with respect to the auger screw 21. That is, the connecting member 61 connects the underground buried object 4 to be lifted to the arm 62 on the auger screw 21 side, which is the member that lifts it, in a state that allows the auger screw 21 to rotate and restricts the downward movement of the underground buried object 4 with respect to the auger screw 21. As a result, in the fourth step (pulling up step) and the fifth step (pulling up step), when the auger screw 21 moves upward and the arm 62 tilts upward, the underground buried object 4 is pulled upward via the connection member 61.

[0089] In the first and second embodiments, the push-up device 30 is provided with a buried object support member (push-up member) 31 and a jack (push-up member) 32, and the buried object 4 is pushed up by pushing up the buried object support member 31 with the jack 32, but the present invention is not limited to this. That is, in the fourth step (pulling-up step) and the fifth step (pulling-up step), the jack 32 of the push-up device 30 may push up the buried object 4 via a member other than the buried object support member 31, or may directly push up the buried object 4.

[0090] For example, as shown in Fig. 10, the push-up device 30 does not need to be provided with a buried object support member (push-up member) 31, and the connection member 22 may be disposed above and spaced apart from the ground 5, and the jack (push-up member) 32 of the push-up device 30 may be disposed below the connection member 22. The jack 32 pushes the connection member 22 upward from the ground 5 side in the fourth step (pull-up step) and the fifth step (pull-up step). That is, the jack 32 pushes up the underground buried object 4 via the connection member 22. In this case, the connection member 22 that connects the underground buried object 4 to the auger screw 21 may be formed in a grid shape or a ring shape like the buried object support member 31 described above.

[0091] Alternatively, as shown in FIG. 11, when the underground buried object 4 has a portion (a portion protruding laterally in FIG. 11) that can be pushed up by the jack (push-up member) 32, the push-up device 30 may not be provided with a buried object support member (push-up member) 31, and the jack (push-up member) 32 of the push-up device 30 may be disposed below the portion of the underground buried object 4 that can be pushed up. The jack 32 pushes up the underground buried object 4 upward from the ground 5 side in the fourth step (pulling up step) and the fifth step (pulling up step). That is, the jack 32 directly pushes up the underground buried object 4. Note that the rotary lifting devices 20, 50 are not shown in FIG. 11.

[0092] Furthermore, in the buried object lifting device 10, 40 of the first and second embodiments, the two devices (the rotary lifting device 20, 50 and the push-up device 30) are separate devices, but this is not limited to this, and for example, the buried object lifting device 10, 40 may be a single device in which the rotary lifting device 20, 50 and the push-up device 30 are integrated.

[0093] Next, a third embodiment of the present invention will be described with reference to the drawings. The buried object pulling method of this embodiment differs from the first embodiment in that the auger screw 21 side is not connected to the underground buried object 4 side. Note that the same components as those of the first embodiment are given the same reference numerals and their description will be omitted.

[0094] FIG. 12 is an explanatory diagram of a buried object pulling up method according to the third embodiment of the present invention.

[0095] In this embodiment, the underground buried object 4 to be lifted is an underground tank. The underground buried object 4 is buried in the ground along a predetermined direction (vertical direction in this embodiment). In this embodiment, the width (length L2 in the direction intersecting the predetermined direction) of the underground buried object 4 is wide, so two vertical holes 6 are excavated by two auger screws 21 on both sides of the underground buried object 4 in the direction intersecting the predetermined direction, and the underground buried object 4 is lifted up from both sides.

[0096] The buried object pulling-up method according to the embodiment is a method for pulling up an underground buried object 4 upward, and includes a first step and a second step.

[0097] In the first step (excavation step), two vertical holes 6 are excavated along the above-mentioned predetermined direction by two auger screws 21. The two vertical holes 6 are excavated on both sides of the underground buried object 4 in a direction intersecting with the above-mentioned predetermined direction and at a position close to the underground buried object 4. The depths of the two vertical holes 6 are set to be approximately the same. The depths of the two vertical holes 6 are excavated to a position below the bottom end of the underground buried object 4 so that the underground buried object 4 is included within at least one of the ranges above the imaginary line VL where the rise angle θ from the horizontal line HL at the height position of the bottom end of one of the vertical holes 6 is 45 degrees, and the range above the imaginary line VL where the rise angle θ from the horizontal line HL at the height position of the bottom end of the other vertical hole 6 is 45 degrees. That is, the depth L1 of each vertical hole 6 below the lower end of the underground buried object 4 (the distance L1 along the above-mentioned predetermined direction between the lower end of the underground buried object 4 and the bottom of the vertical hole 6) has at least the length L3 required to include the underground buried object 4 within at least one of the ranges when two vertical holes 6 are excavated on both sides of the underground buried object 4 and in close contact with the underground buried object 4. When two vertical holes 6 are excavated on both sides of the underground buried object 4 and in close contact with the underground buried object 4, the length L3 required to include the underground buried object 4 within at least one of the ranges is half the length L2 of the underground buried object 4 in the direction intersecting the above-mentioned predetermined direction (horizontal length). As in the first embodiment, the auger screw 21 drives the rotary press-in device 3 of the heavy equipment 2 to rotate the auger screw 21 in the first direction.

[0098] In the second step (pulling up step), the two auger screws 21 are rotated in the second direction while feeding the soil 29 into the vertical hole 6 from the upper openings of the two vertical holes 6. When the auger screw 21 is rotated in the second direction, the soil 29 is transported downwards in the vertical hole 6 by the cutting blade 25. When the soil 29 is transported downwards in the vertical hole 6 and the lower part of the vertical hole 6 is backfilled with the soil 29, the soil 29 spreads from the auger screw 21 side to the range above the virtual line VL, pushing up the underground buried object 4 from below and backfilling the space (not shown) that occurs below the underground buried object 4. Then, by continuing to rotate the two auger screws 21 in the second direction while feeding the soil 29 into the vertical hole 6 from the upper openings of the two vertical holes 6, the underground buried object 4 is gradually pushed upwards, and finally the underground buried object 4 can be pulled up from above. The soil 29 transported downward by the auger screw 21 may be fed into the vertical hole 6 from the upper opening thereof by a worker or may be fed by a device.

[0099] In the above-mentioned configuration, the vertical hole 6 is excavated along the direction in which the underground buried object 4 is buried (the above-mentioned predetermined direction), so unlike the case where the vertical hole 6 is excavated at an angle to the direction in which the underground buried object 4 is buried, the vertical hole 6 can be excavated in a position close to the underground buried object 4. In addition, since the vertical hole 6 is excavated in a position close to the underground buried object 4, the working space required for the work of pulling up the underground buried object 4 can be reliably reduced.

[0100] Furthermore, since the earth and sand 29 from the two auger screws 21 pushes up the underground buried object 4, the underground buried object 4 can be pushed up more easily than in the case of using only one auger screw 21.

[0101] Furthermore, when the auger screw 21 is rotated in the second direction to apply pressure to the soil 29 below the vertical hole 6, the soil 29 moves upward from the tip side of the auger screw 21 at an angle of 45 degrees. Therefore, the soil 29 moving upward from the tip sides of the two auger screws 21 at an angle of 45 degrees pushes up the underground buried object 4 from below, and backfills a space (not shown) that occurs below the underground buried object 4. As a result, even if a space occurs below the underground buried object 4 when the underground buried object 4 is pushed upward, it is backfilled by the soil 29, so loosening of the ground around the underground buried object 4 can be suppressed.

[0102] Furthermore, since the underground buried object 4 can be pushed up through two steps (the first step and the second step), the underground buried object 4 can be pulled up through a simple operation.

[0103] In this embodiment, two vertical holes 6 are excavated by two auger screws 21, but three or more vertical holes 6 may be excavated by three or more auger screws 21. Even in this case, the vertical holes 6 are excavated so that the depth L1 of each vertical hole 6 below the lower end of the underground buried object 4 has a length L3 that is at least half the length (horizontal length) L2 of the underground buried object 4 in the direction intersecting the above-mentioned predetermined direction.

[0104] In addition, in this embodiment, multiple (two) vertical holes 6 are excavated by multiple (two) auger screws 21, but one vertical hole 6 may be excavated by one auger screw 21. In this case, the vertical holes 6 are excavated so that the depth L1 of each vertical hole 6 below the lower end of the underground buried object 4 has at least a length L2 (horizontal length) in a direction intersecting the above-mentioned predetermined direction of the underground buried object 4.

[0105] In addition, in this embodiment, the vertical hole 6 is excavated at a position close to the underground buried object 4, but it may be excavated at a position adjacent to the underground buried object 4.

[0106] In addition, in this embodiment, the underground buried object 4 is pushed up by the force of the soil 29 below the underground buried object 4, but the present invention is not limited to this, and the underground buried object 4 may be pushed up by the force of the soil 29 below the underground buried object 4 and pulled up by another device. For example, when the underground buried object 4 is exposed above ground, a pushed-up member (e.g., the buried object support member 31 described in the first embodiment above, etc.) may be attached to the underground buried object 4, and the pushed-up member or the underground buried object 4 may be pushed up by a pushing-up member (the jack 32 described in the first embodiment above, etc.) while the auger screw 21 is rotated in the second direction to push up the underground buried object 4 with the soil 29.

[0107] In addition, in this embodiment, the soil 29 functions as a backfilling material, but the backfilling material is not limited to this. For example, liquefied treated soil, which is artificially made by mixing construction waste soil with water and cement, may function as a backfilling material.

[0108] In this embodiment, the direction in which the underground buried object 4 is buried (the above-mentioned predetermined direction) is the vertical direction, but is not limited thereto and may be inclined with respect to the vertical direction, for example. Even in this case, in the first step, the vertical hole 6 is excavated along the above-mentioned predetermined direction in which the underground buried object 4 is buried.

[0109] Although the present invention has been described based on the above embodiment, the present invention is not limited to the contents of the above embodiment, and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, and operational techniques made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. [Explanation of symbols]

[0110] 1: Drilling equipment 2: Heavy machinery 4: Underground objects (buried objects) 5: Ground 6: Vertical hole (drilling hole) 10,40: Buried object lifting device 20,50: Rotating lifting device 21,51: Auger screw (screw) 22,61: Connection member 29: Soil and sand (backfill material) 30: Lifting device 31: Buried object support member (push-up member) 32: Jack (lifting member) 52: External cylinder member 58: Screw insertion hole

Claims

1. A buried object lifting method for lifting an object buried in the ground upward along a predetermined direction, a drilling step of drilling a drilling hole extending along the predetermined direction by a screw; a connecting step of connecting the embedded object to the screw in a state in which rotation of the screw is permitted and downward movement of the embedded object relative to the screw is restricted; A pulling-up process is performed by rotating the screw connected to the buried object and inserted into the drilled hole in a direction opposite to the direction of rotation in the drilling process. A buried object pulling-up method, in which the borehole is excavated in a position close to or adjacent to the outer surface of the buried object so as to be parallel to the buried object.

2. 2. The buried object pulling method according to claim 1, wherein in the pulling step, the screw is rotated in a direction opposite to a rotation direction in the excavation step while feeding backfill material into the borehole from above.

3. The buried object pulling up method according to claim 2 , wherein in the excavation step, the borehole is excavated to a depth below a lower end of the buried object.

4. A buried object lifting device that lifts up a buried object buried in the ground in a predetermined direction, A screw capable of drilling a hole in a position close to or adjacent to an outer surface of the buried object so as to be parallel to the buried object by rotating in a first direction; a connecting member that connects the embedded object to the screw in a state that allows rotation of the screw and restricts downward relative movement of the embedded object with respect to the screw; The screw is capable of transporting backfill material from the top of the borehole to the bottom of the borehole by rotating in a second direction opposite to the first direction, comprising: a buried object lifting device;

5. a cylindrical outer cylinder member that defines a screw insertion hole on an inner diameter side and is capable of drilling the radial outside of the drilling hole downward by rotation; The buried object lifting device according to claim 4 , wherein the screw is inserted through the screw insertion hole of the outer tubular member.

6. 6. The buried object lifting device according to claim 4, further comprising a push-up member capable of pushing up the buried object from the ground side upward when the screw is rotated in the second direction.

7. 7. The buried object pulling up device according to claim 6, wherein the push-up member pushes the connection member upward from the ground side, thereby pushing the buried object upward from the ground side.

8. a pushed-up member attached to the buried object, 7. The buried object pulling device according to claim 6, wherein the pushing-up member pushes the pushed-up member upward from the ground side, thereby pushing the buried object upward from the ground side.

Images