Pile extracting device

Abstract

To provide a pile pull-out device and a pile pull-out system of a simple structure for efficiently and safely pulling out a pile from the ground by using a single rotary shaft.SOLUTION: A pile extracting device includes a hollow cylindrical casing, a pair of buckets provided on a lower end side of the casing, and a pair of pivotally supporting parts configured to pivotally support the pair of buckets in a rotatable manner, wherein the pair of pivotally supporting parts are provided at positions facing each other at an interval in a circumferential direction of the casing, and one bucket and the other bucket are pivotally supported by the same shaft. The bucket may be formed by bending a plate material into an arc shape along an inner diameter of the casing, and the casing may rotate in a circumferential direction of the hollow cylindrical shape and have a first excavation bit on a rotation track on a lower end side of the pair of pivotally supporting parts.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a pile extraction device for extracting existing piles (buried piles) driven into the ground, and in particular to a technique for safely extracting piles using a device with a simple structure. [Background technology]

[0002] For example, large architectural structures such as buildings, apartment buildings, and factories use concrete piles embedded in the solid ground to support the building's load. When rebuilding this type of architectural structure, it is necessary to first demolish and remove the old building, and then pull out and remove the old existing piles buried deep underground.

[0003] For extracting such existing piles, there is a pile extraction device as described in Patent Document 1. This type of pile extraction device is attached to a base machine such as a pile driver via a rotary drive device such as an auger, and while excavating the ground, it advances to the existing pile, clamps the existing pile, and pulls it up to the ground.

[0004] Furthermore, the pile extraction device described in Patent Document 1 comprises an inner tube having a hollow cylindrical shape, a pair of retaining pieces attached to the lower end of the inner tube so as to face each other in the diameter direction of the inner tube, an outer tube having a hollow cylindrical shape, and a digging blade provided at the lower end of the outer tube, and the pair of retaining pieces are rotatable between an open position in which the lower ends of the pair of retaining pieces are spaced apart to open the downward opening of the inner tube, and a closed position in which the lower ends of the pair of retaining pieces are close to each other to block the downward opening of the inner tube.

[0005] In this pile extraction device, when clamping an existing pile to pull it up, the tips of the holding pieces abut against the existing pile as the holding pieces move from the open position to the closed position, and the existing pile is clamped. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2018-111984 Summary of the Invention [Problem to be solved by the invention]

[0007] In the pile extraction device described in Patent Document 1, each of a pair of holding pieces is supported by a shaft, and a rotation shaft is formed for each holding piece. However, the more rotation shafts there are, the more complex the structure of the device becomes, which raises the problem of increased manufacturing costs. Furthermore, when the pile extraction device is rotated by a rotary drive device to excavate, if there are two rotation shafts, the shaft support protrudes inside the inner tube (casing), which raises the problem of the device being susceptible to breakdown due to soil pressure inside the casing.

[0008] The present invention has been proposed to solve the above problems, and aims to provide a pile extraction device with a simple structure that can efficiently and safely extract piles from the ground using a single rotating shaft. [Means for solving the problem]

[0009] (1) The pile extraction device of the present invention comprises a hollow cylindrical casing, a pair of buckets provided on the lower end side of the casing, and a pair of support parts that rotatably support the pair of buckets, the pair of support parts being provided at opposing positions spaced apart around the circumferential direction of the casing, and one bucket and the other bucket being supported by the same shaft.

[0010] With this pile extraction device, the buckets are supported on the same shaft, which simplifies the structure compared to conventional devices that use multiple rotating shafts, reducing manufacturing costs and facilitating maintenance of the device. This makes it possible to provide a pile extraction device with a simple structure that can efficiently and safely extract piles from the ground.

[0011] (2) In the pile extraction device, the bucket is formed by bending a plate material into an arc shape so as to fit the inner diameter of the casing.

[0012] (3) In the pile extraction device, the casing rotates in the circumferential direction of the hollow cylinder, and has a first drilling bit on a rotational track on the lower end side of the pair of shaft support portions.

[0013] (4) The pile extraction device has a cylinder mechanism for rotating the bucket outside the casing.

[0014] (5) The pile extraction device has a second drilling bit on a rotational track at the lower end side of the cylinder mechanism.

[0015] (6) The pile extraction system of the present invention comprises a hollow cylindrical casing, a pair of buckets provided at the lower end of the casing, and a pair of support parts for rotatably supporting the pair of buckets, the pair of support parts being provided at opposing positions spaced apart circumferentially around the casing, and one bucket and the other bucket being supported by the same shaft.The pile extraction device uses a pile extraction device in which, with the casing surrounding the buried pile, the pair of buckets rotate from an open state to a closed state so as to clamp the buried pile, and clamp the buried pile and lift it to the ground. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a pile extraction device and a pile extraction system having a simple structure that can efficiently and safely extract piles from the ground using a single rotating shaft. can. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a side view showing a stake-out system according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a side view showing a pile extraction device of the pile extraction system shown in FIG. [Figure 3] 3 is a side view showing a first cylindrical member of the pile puller shown in FIG. 2. FIG. [Figure 4] 3 is a side view showing a second cylindrical member of the pile puller shown in FIG. 2. FIG. [Figure 5]3 is a side view showing a third cylindrical member of the pile puller shown in FIG. 2. FIG. [Figure 6] 6 is a side view showing an open state and a closed state of a bucket chucking device provided on the third cylindrical member shown in FIG. 5. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a pile extraction system S according to an embodiment of the present invention will be described with reference to the drawings. The pile extraction system S is used to pull up existing piles buried in the ground to the surface.

[0019] <Configuration of the pile extraction system> As shown in Fig. 1, the pile extraction system S includes a large base machine 1 such as a pile driver, a rotary drive device 2 such as an auger device attached to the tip of the leader of the base machine 1, and a pile extraction device 3 attached to the auger device. According to the pile extraction system S of this embodiment, the pile extraction device 3 excavates the ground underground, and a bucket chucking mechanism 6 (described later) clamps or cuts the existing pile and pulls it up to the ground.

[0020] In the pile extraction system S according to this embodiment, the rotation drive device 2 rotates around an axis in the vertical direction in Fig. 1, and therefore in the following description, the vertical direction will be referred to as the rotation axis direction or the axial direction, the rotation direction relative to the rotation axis direction will be referred to as the rotation circumferential direction or the circumferential direction, and the direction perpendicular to the axial and circumferential directions will be referred to as the rotation radial direction. Furthermore, the downward direction in the rotation axis direction will be referred to as the tip side or the tip direction, and the upward direction will be referred to as the base side or the base direction.

[0021] <Configuration of the pile extraction device 3> As shown in Figures 2 to 6, the pile extraction device 3 comprises a hollow cylindrical casing 5, a bucket chucking mechanism 6 provided at the tip side of the casing 5, a cylinder mechanism 8 that rotates the bucket chucking mechanism 6, and a plurality of drilling bits 9 provided at the tip of the casing 5.

[0022] 2, the casing 5 includes a first cylindrical member 51 connected to the rotary drive device 2, at least one second cylindrical member 52 connected below the first cylindrical member 51, and a third cylindrical member 53 connected to the lowest second cylindrical member 52. The casing 5 is formed in the shape of a long hollow cylinder as a whole, with the hollow cylindrical first cylindrical member 51, the hollow cylindrical second cylindrical member, and the hollow cylindrical third cylindrical member 53 being connected in series.

[0023] Each cylindrical member constituting the casing 5 has an inner diameter large enough to enclose an existing pile therein, and the number of second cylindrical members 52 in the casing 5 is adjusted according to the depth of the existing pile. In this embodiment, the casing 5 includes two second cylindrical members 52. Each cylindrical member is formed using a steel pipe or the like.

[0024] As shown in FIG. 3, the first cylindrical member 51 has a connection portion 51a that connects to the rotation drive device 2, and is connected to the rotation drive device 2 to rotate. The lower end of the first cylindrical member 51 has a first connection portion 51b that connects to the second cylindrical member 52. The first cylindrical member 51 is formed in a roughly hollow cylindrical shape, and on its outer periphery, a pair of extension / retraction portions 80 that constitute the cylinder mechanism 8 on the upper side and a first rod-shaped portion 81 extending from each extension / retraction portion 80 are provided. The cylinder mechanism 8 is a hydraulic cylinder in which the extension / retraction portions 80 are extended and contracted by hydraulic pressure.

[0025] 4, the second cylindrical member 52 is formed in a generally hollow cylindrical shape and has a second connecting portion 52b at its upper end and a third connecting portion 52c at its lower end. Furthermore, the second cylindrical member 52 is provided on its outer periphery with a second rod-shaped portion 82 that constitutes the cylinder mechanism 8, and as the expandable portion 80 expands and contracts, the second rod-shaped portion 82 is displaced up and down via the rod-shaped portion connected to the upper side.

[0026] In this embodiment, the casing 5 includes two second cylindrical members 52 connected vertically, and in the upper second cylindrical member 52, the second connecting portion 52b is connected to the first connecting portion 51b of the first cylindrical member 51, and the third connecting portion 52c is connected to the second connecting portion 52b of the lower second cylindrical member 52. In addition, in the lower second cylindrical member 52, the third connecting portion 52c is connected to a fourth connecting portion 53c of a third cylindrical member 53, which will be described later.

[0027] 5, the third cylindrical member 53 is formed in a generally hollow cylindrical shape and has a fourth connecting portion 53c at its upper end. The third cylindrical member 53 is also provided with a bucket chucking mechanism 6 at its tip end, and is also provided with a plurality of excavation bits 9 at its tip end.

[0028] The bucket chucking mechanism 6 includes a pair of buckets 60 provided inside the third cylindrical member 53, a support portion 63 that supports each bucket 60, and a plurality of clamping claws 61 provided on the tip side of each bucket 60.

[0029] Each bucket 60 has a shape obtained by curving a plate material into an arc. The radius of curvature of the bucket 60 is curved so as to be approximately the same as or slightly smaller than the radius of curvature of the third cylindrical member 53. A plurality of clamping claws 61 are provided so as to be aligned on the curved plate-shaped portion of each bucket 60.

[0030] One end and the other end of each bucket 60 are pivotally supported by a pair of pivotal supports 63 on the third cylindrical member 53. One end of one bucket 60 and one end of the other bucket 60 are pivotally supported by one of the pivotal supports 63. The other end of one bucket 60 and the other end of the other bucket 60 are pivotally supported by the other pivotal support 63.

[0031] Of the multiple excavation bits 9, a first excavation bit 9a is provided on the rotational orbit on the lower end side of the support portion 63 when the casing 5 rotates. This first excavation bit 9a corresponds to being provided on the rotational orbit of the clamping claws 61 provided at the tip of the bucket 60 when the bucket chucking mechanism 6, which will be described later, is in the open state. In addition, multiple second excavation bits 9b are provided on the rotational orbit on the lower end side of the connecting rod-shaped portion 85 of the cylinder mechanism 8 on the side peripheral wall of the third cylindrical member 53. Furthermore, multiple third excavation bits 9c are provided at the lower end of the side peripheral wall of the third cylindrical member 53.

[0032] Furthermore, the third cylindrical member 53 has on its outer periphery a third rod-shaped portion 83 that constitutes the cylinder mechanism 8 and an insertion portion 84 that passes through an insertion hole (not shown) provided in the third cylindrical member 53, and when the expansion and contraction portion 80 provided in the first cylindrical member 51 expands and contracts, the third rod-shaped portion 83 is displaced up and down via the second rod-shaped portion 82 connected to the upper side of the third rod-shaped portion 83, and the insertion portion 84 is displaced diagonally up and down through the insertion hole.

[0033] Specifically, a axial support portion 63 is formed by a pin that penetrates the side peripheral wall of the third cylindrical member 53 and the bucket 60. Each bucket 60 is rotatable about the pin. One axial support portion 63 and the other axial support portion 63 are provided at an interval of 180° in the circumferential direction of the cylindrical portion so as to face the cylindrical portion of the third cylindrical member 53. In other words, one bucket 60 and the other bucket 60 are axially supported by the same shaft.

[0034] Each insertion portion 84 passes through an insertion hole provided in the side peripheral wall 53a of the third cylindrical member 53 from the outside to the inside of the third cylindrical member 53, and its tip is connected to the bucket 60. As the insertion portion 84 is displaced diagonally up and down, the bucket 60 rotates about the pin.

[0035] The cylinder mechanism 8 is provided on the outside of the casing 5, extending from approximately the upper end to the lower end. The cylinder mechanism 8 includes, in order from the base end to the tip end, a pair of telescopic sections 80, a pair of first rod-shaped sections 81, a pair of second rod-shaped sections 82, a pair of third rod-shaped sections 83, and a pair of insertion sections 84, and the first rod-shaped sections 81, the second rod-shaped section 82, the third rod-shaped section 83, and the insertion sections 84 are connected to form a connecting rod-shaped section 85 (see FIG. 2). The pair of telescopic sections 80 and the pair of connecting rod-shaped sections 85 are provided at an interval of 180° in the circumferential direction so as to face the cylindrical casing 5.

[0036] As shown in FIG. 6(A), the cylinder mechanism 8 lifts the bucket 60 via the connecting rod portion 85 when the telescopic section 80 is contracted. Also, as shown in FIG. 6(B), the cylinder mechanism 8 pushes down the bucket 60 via the connecting rod portion 85 when the telescopic section 80 is extended. That is, when the telescopic section 80 is contracted, each bucket 60 is lifted, and the pair of buckets 60 is in an open state (see FIG. 6(A)). Also, when the telescopic section 80 is extended, each bucket 60 is pushed down, and the pair of buckets 60 is in a closed state (see FIG. 6(B)).

[0037] <Operation of the pile extraction device> The pile extraction device 3 moves the casing 5 downward while rotating the casing 5 by the rotation of the rotary drive device 2. This excavates the casing 5 into the ground. At this time, multiple excavation bits 9 attached to the lower end of the casing 5 excavate by scraping the soil. The casing 5 advances until it reaches a depth that surrounds the existing pile. At this time, the pair of buckets 60 are in an open state.

[0038] When the casing 5 reaches a depth sufficient to surround the existing pile and encloses it, the pair of buckets 60 rotate to a closed state so as to sandwich the existing pile. Specifically, the telescopic section 80 of the cylinder device shifts from a contracted state to an extended state, and the connecting rod-shaped section 85 moves downward. The tip of the connecting rod-shaped section 85, i.e., the insertion section 84, shifts so as to pass through the insertion hole of the third cylindrical section and push down the bucket 60. This causes the pair of buckets 60 to transition from an open state to a closed state.

[0039] The bucket 60 clamps the existing pile while shifting to the closed state. With the existing pile clamped, the casing 5 is pulled up to lift the pile to the ground.

[0040] In this embodiment, the pile extraction device 3 has been described as having a configuration in which the bucket 60 rotates due to the extension and contraction of the cylinder mechanism 8. However, the pile extraction device 3 may have the bucket 60 rotated by a cam mechanism as in JP 2018-111984 A, or may have the bucket 60 rotated by another mechanism.

[0041] In this embodiment, the cylinder mechanism 8 is a hydraulic cylinder. However, the cylinder mechanism 8 may be another type of cylinder, such as an electric cylinder or an air cylinder.

[0042] In this embodiment, the existing pile is clamped by the bucket 60 and lifted to the ground in one go. However, the existing pile may be lifted to the ground in multiple steps. For example, the existing pile may be cut by further shifting the bucket 60 to a closed state after clamping the existing pile.

[0043] In this case, the cut existing pile above the closed bucket 60 may be lifted to the ground, and the casing 5 may be advanced again to the existing pile remaining underground below, and the existing pile may be clamped between the bucket 60 and lifted to the ground. In other words, the existing pile may be pulled up in multiple steps.

[0044] When lifting up the casing 5, the rotary drive device 2 may be rotated, and the casing 5 may be lifted while rotating the bucket 60. Alternatively, when cutting an existing pile, the rotary drive device 2 may be rotated, and the existing pile may be cut while rotating the bucket 60.

[0045] The pile extraction device 3 and the pile extraction method according to the embodiment of the present invention have been described above. However, the pile extraction device 3 and the pile extraction method are not limited to the above embodiment, and other configurations may be used as long as the object of the invention is achieved. [Industrial Applicability]

[0046] INDUSTRIAL APPLICABILITY The present invention can be used for a pile extraction device and a pile extraction system that pulls existing piles above ground. [Explanation of symbols]

[0047] S: Pile Pulling System 1: Base machine 2: Rotation drive device 3: Pile extraction device 5: Casing 6: Bucket chucking mechanism 8: Cylinder mechanism 9: Drilling bit 9a: First drill bit 9b: Second drill bit 9c: Third drill bit 51: First cylindrical member 51a: Connection part 51b: First connecting portion 52: Second cylindrical member 52b: Second connecting part 52c: Third connecting part 53: Third cylindrical member 53a: Side wall 53c: Fourth connecting part 60: Bucket 61: Gripping claw 63: Axis branch 80: Telescopic part 81: First rod-shaped portion 82: Second rod-shaped portion 83: Third rod 84: Insertion part 85: Connecting rod-shaped part

Claims

1. a hollow cylindrical casing; A pair of buckets provided on the lower end side of the casing; a pair of pivotal support portions that pivotally support the pair of buckets, A pile extraction device characterized in that the pair of support portions are provided at opposing positions spaced apart in the circumferential direction of the casing, and one bucket and the other bucket are supported by the same shaft.

2. The pile extractor according to claim 1 , wherein the bucket is formed by bending a plate material into an arc shape so as to fit the inner diameter of the casing.

3. The pile extraction device according to claim 1 , wherein the casing rotates in a circumferential direction of the hollow cylinder, and has a first drilling bit on a rotational track on the lower end sides of the pair of shaft support portions.

4. The pile extracting device according to claim 1 , further comprising a cylinder mechanism for rotating the bucket outside the casing.

5. The pile extraction device according to claim 4, further comprising a second drill bit on a rotation track at a lower end of the cylinder mechanism.

6. a hollow cylindrical casing; A pair of buckets provided on the lower end side of the casing; a pair of pivotal support portions that pivotally support the pair of buckets; The pair of shaft support portions are provided at positions opposite to each other with a gap in the circumferential direction of the casing, and one bucket and the other bucket are supported by the same shaft. With the casing surrounding the buried pile, the pair of buckets rotate from an open state to a closed state so as to clamp the buried pile, and then clamp the buried pile and lift it above ground, in this pile extraction system.

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