Device for crushing and removing existing piles and method for crushing and removing existing piles

Abstract

The present invention provides an existing pile crushing and removal device and method that facilitate the removal of joints in piles made of steel plates, thereby shortening working time and enabling easy removal of the piles without leaving any residue. [Solution] The pile 1 installed in the ground is removed by an auger method in which the inner auger screw 13 and the auger head 12 at its tip and the outer casing 11 are rotated in opposite directions to perform excavation. The casing 11 has cutters 22a, 22b, and 22c that protrude in the direction of the central axis on the inner circumferential surface so as to be able to cut the outer circumference of the pile 1 when inserted into the ground around the pile 1 while rotating and excavating, and guide plates 23 that protrude inward and diagonally upward on the inner circumferential surface below the cutters and hit the head of the pile 1 as the casing 11 descends to guide the cutters below the head.

Description

Technical Field

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[0001] The present invention relates to a device for crushing and removing existing piles and a method for crushing and removing existing piles.

Background Art

[0002] Conventionally, as a method for removing existing concrete piles installed in the ground, there is a method of crushing and removing the piles by the auger method in which the inner auger screw and the auger head attached to the tip thereof and the outer casing are rotated in opposite directions to each other for excavation. When an iron plate is provided at the joint of the pile extending vertically, there are problems such that the auger head is worn out for crushing the iron plate with the auger head and that it takes time for the crushing work of the iron plate.

[0003] In order to solve this problem, the present inventor has developed a method for crushing and removing an existing pile having a plurality of cutters protruding in the central axis direction on the inner peripheral surface of the casing, cutting the outer peripheries of the upper and lower piles sandwiching the joint of the pile with each cutter, and then applying an impact to the joint with the auger head to separate the joint from the pile (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the method for crushing and removing an existing pile described in Patent Document 1, there is a problem that the cutter on the inner peripheral surface of the casing is caught by the head of the pile, it is difficult to position it on the outer periphery of the pile beyond the head and the joint of the pile, and it may be difficult to crush the pile.

[0006] This invention has been made in view of these problems, and aims to provide an existing pile crushing and removal device and method that can easily remove the joints of piles made of steel plates, shorten working time, and easily remove the piles without leaving any residue. [Means for solving the problem]

[0007] To achieve the above objective, the existing pile crushing and removal device according to the present invention is an existing pile crushing and removal device that removes piles installed in the ground by an auger method in which an inner auger screw and an auger head attached to its tip and an outer casing are rotated in opposite directions to perform excavation, wherein the casing has a cutter that protrudes in the direction of the central axis on the inner circumferential surface so as to be able to cut the outer circumference of the pile when inserted into the ground around the pile while rotating and excavating, and a guide plate that is provided on the inner circumferential surface below the cutter and protrudes inward and diagonally upward so as the casing descends and hits the head of the pile to guide the cutter below the head, wherein the auger head is rotatably provided so as to rotate the auger screw when the cutter cuts the outer circumference of the pile, the pile is crushed from the head, and the auger screw is rotatably provided so as to transport the crushed pile material crushed by the auger head to the ground.

[0008] The present invention relates to a method for crushing and removing existing piles, which are installed in the ground and connected vertically by a joint, by an auger method in which an inner auger screw and an auger head attached to its tip and an outer casing are rotated in opposite directions to perform excavation, wherein the casing has a cutter that protrudes in the direction of the central axis on the inner circumferential surface so as to be able to cut the outer circumference of the pile when inserted into the ground around the pile while rotating and excavating, and a cutter that protrudes inward and diagonally upward on the inner circumferential surface below the cutter and strikes the head of the pile as the casing descends. The auger head is characterized by having a guide plate for guiding the cutter below the head, inserting the casing into the ground around the pile by rotary excavation, cutting the outer circumference of the pile with the cutter guided below the head of the pile by the guide plate, crushing the pile from the head with the auger head, further cutting the outer circumference of the upper and lower piles sandwiching the joint with the cutter, then applying an impact to the joint with the auger head to separate the joint from the pile, and transporting the crushed pile material and the joint crushed by the auger head to the ground with the auger screw.

[0009] The existing pile crushing and removal device according to the present invention is used to remove piles installed in the ground as follows. First, the casing is inserted into the ground around the pile while rotating and excavating. At this time, as the casing descends, the guide plate comes into contact with the top of the pile and guides the cutter below the top of the pile. This allows the cutter to be positioned on the outer circumference of the pile, beyond the top of the pile and the joint, without getting caught on the top of the pile. The cutter positioned on the outer circumference of the pile can cut the outer circumference of the pile, and can also cut the outer circumference of the pile below the joint.

[0010] Next, the auger screw and the auger head attached to its tip are inserted into the casing while rotating in the opposite direction to the casing, and excavation is performed. At this time, the auger head crushes the pile from the top, and the crushed material can be transported to the surface by the auger screw. Because the outer circumference of the pile has been pre-cut by a cutter, the pile can be easily crushed with the auger head.

[0011] As the cutter cuts the outer circumference of the pile below the joint, the auger head crushes the pile and applies an impact to the joint. The impact force applied to the joint can destroy the cut portion below the joint. In this way, the joint can be separated from the pile and transported to the surface along with the crushed pile material by the auger screw.

[0012] The existing pile crushing and removal device according to the present invention allows for the suitable implementation of the existing pile crushing and removal method according to the present invention. The existing pile crushing and removal device and the existing pile crushing and removal method according to the present invention facilitate the removal of pile joints such as steel plates, thereby reducing working time. Since there is no need to crush the joints, wear on the auger head is reduced, and special chips for cutting the joints are unnecessary, thus reducing material costs. Furthermore, even with joints, the pile can be crushed down to the bottom, allowing for easy removal without leaving any piles behind. The cutter is preferably made of a material that can easily cut through the concrete on the outer perimeter of the pile and the reinforcing bars inside, such as a carbide tip.

[0013] In the existing pile crushing and removal device according to the present invention, it is preferable that a plurality of cutters are provided at different distances from the tip side of the casing, the amount of protrusion of each cutter from the inner circumferential surface of the casing is greater for upper cutters, and the guide plate is provided protruding inward and diagonally upward from the inner circumferential surface below each cutter. In this case, each cutter is guided below the head of the pile, and as the casing is inserted deeper, the amount of cutting on the outer circumference of the pile by the cutters can be gradually increased. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide an existing pile crushing and removal device and an existing pile crushing and removal method that make it easy to remove the joints of piles such as steel plates, thereby shortening the working time and making it easy to remove the piles without leaving any residue. [Brief explanation of the drawing]

[0015] [Figure 1] The following images illustrate a method for crushing and removing existing piles using an existing pile crushing and removal device according to an embodiment of the present invention: (A-1) a plan view of step 1, (A-2) a longitudinal section view, (B-1) a plan view of step 2, (B-2) a longitudinal section view, (C-1) a plan view of step 3, and (C-2) a longitudinal section view. [Modes for carrying out the invention]

[0016] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows an existing pile crushing and removal device and an existing pile crushing and removal method according to an embodiment of the present invention. As shown in Figure 1, the existing pile crushing and removal device 10 has a casing 11, an auger head 12, and an auger screw 13, and is configured to remove the pile 1 installed in the ground by an auger method in which the inner auger screw 13 and the auger head 12 attached to its tip (lower end) and the outer casing 11 are rotated in opposite directions to perform excavation.

[0017] As shown in Figure 1, the casing 11 is cylindrical and has a casing bit 21 at its tip (lower end) so that it can be inserted into the ground. The casing 11 has a plurality of cutters 22a, 22b, and 22c that protrude from the inner circumferential surface in the direction of the central axis. Each cutter 22a, 22b, and 22c is made of a carbide tip and is provided at different distances from the tip side (lower end side) of the casing 11 in the longitudinal direction of the casing 11. The amount of protrusion from the inner circumferential surface of each cutter 22a, 22b, and 22c from the inner circumferential surface of the casing 11 is greater for the upper cutters. Each cutter 22a, 22b, and 22c is offset by approximately 60 degrees from the central axis of the casing 11 in the plan view. Each cutter 22a, 22b, and 22c is configured to cut the outer circumference of the pile 1 when the casing 11 is inserted into the ground around the pile 1.

[0018] As shown in Figures 1(A-2), (B-2), and (C-2), the casing 11 has a plurality of guide plates 23 that protrude inward and diagonally upward from the inner circumferential surface below each cutter 22a, 22b, and 22c. Each guide plate 23 extends to a length that does not exceed the tip (protruding end) of each cutter 22a, 22b, and 22c, and its tip (inner end) is connected to each cutter 22a, 22b, and 22c, respectively. Each guide plate 23 is configured to strike the top (upper end) of the pile 1 as the casing 11 descends, guiding the cutters 22a, 22b, and 22c below the top of the pile 1.

[0019] As shown in Figure 1, the auger head 12 is attached to the tip of the auger screw 13 and is configured to crush the pile 1 from the top. The auger screw 13 is configured to transport the crushed pile 1, crushed by the auger head 12, to the ground.

[0020] The method for crushing and removing an existing pile according to an embodiment of the present invention is preferably implemented by an existing pile crushing and removing device 10 according to an embodiment of the present invention using a so-called two-axis coaxial earth auger method (doughnut auger method, double auger method). The method for crushing and removing an existing pile according to an embodiment of the present invention first inserts the casing 11 into the ground around the pile 1 while rotating and excavating it. At this time, as the casing 11 rotates and descends, each guide plate 23 hits the head of the pile 1 and guides each cutter 22a, 22b, 22c below the head of the pile 1. As a result, each cutter can be positioned on the outer periphery of the pile 1 beyond the head and the joint portion 2 of the pile 1 without being caught by the head of the pile 1.

[0021] The cutters 22a, 22b, 22c positioned on the outer periphery of the pile 1 can cut the outer periphery of the pile 1 and can also cut the outer periphery of the pile 1 below the joint portion 2 by passing through the joint portion 2. Further, since the cutters 22a, 22b, 22c are provided at positions where the distances from the tip (lower end) of the casing 11 are different, and the amount of protrusion from the inner peripheral surface of the casing 11 increases toward the rear end side of the casing 11, the cutting amount of the outer periphery of the pile 1 by the cutters 22a, 22b, 22c can be gradually increased as the casing 11 is inserted deeper.

[0022] Next, the auger screw 13 and the auger head 12 attached to the tip thereof are inserted into the inside of the casing 11 while rotating in the reverse direction to the casing 11 for excavation. At this time, the auger head 12 can crush the pile 1 from the head and carry out the crushed material to the ground by the auger screw 13. Since the outer periphery of the pile 1 has been cut by the cutter in advance, the pile 1 can be easily crushed by the auger head 12.

[0023] In the portion of the joint 2 of the pile 1 made of a steel plate, since the cutters 22a, 22b, and 22c are provided at positions where the distances from the tip of the casing 11 are different, the cutter 22a with a small protruding amount on the tip side (lower end side) of the casing 11 is guided by the guide plate 23 and passes while sliding on the side surface of the joint 2, and then cuts the outer periphery of the pile 1 below the joint 2. Thereby, the outer peripheries of the upper and lower piles 1 sandwiching the joint 2 can be cut.

[0024] When, in the state where each of the cutters 22a, 22b, and 22c cuts the outer peripheries of the upper and lower piles 1 of the joint 2, an impact is applied to the joint 2 by the auger head 12 while crushing the pile 1 above the joint 2, the cut portion of the pile 1 below the joint 2 can be destroyed by the impact force applied to the joint 2. Thereby, it can be easily separated from the pile 1 without shaving or destroying the joint 2, and can be carried out to the ground together with the crushed material of the pile 1 by the auger screw 13.

[0025] This existing pile crushing and removing device 10 and the existing pile crushing and removing method can easily remove the joint 2 of the pile 1 and can shorten the working time required for crushing the joint 2. Since there is no need to crush the joint 2, the wear of the auger head 12 is small, and no special chip for shaving the joint 2 is required, and the material cost can be reduced.

[0026] Also, even if there is a joint 2, the pile 1 can be crushed to the lower end, and the pile 1 can be easily removed without leaving any. Even if the crushed material of the pile 1 remains underground and cannot be carried out by the auger screw 13, it can be easily removed by using a hammer grab or the like. After removing the pile 1, it is preferable to fill the hole and improve the ground using lean-mixed soil cement or the like in order to prevent settlement of the filled portion and eccentricity of the newly installed pile.

Explanation of Signs

[0027] 1 Pile, 2 Joint, 10 Existing pile crushing and removing device, 11 Casing, 21 Casing bit, 22a, 22b, 22c cutter, 23 guide plate, 12 Auger heads, 13 Auger screws

Claims

1. An existing pile crushing and removal device that removes piles installed in the ground by an auger method in which the inner auger screw and the auger head attached to its tip and the outer casing rotate in opposite directions to perform excavation, The casing has a cutter that protrudes in the direction of the central axis from the inner surface so as to be able to cut the outer circumference of the pile when inserted into the ground surrounding the pile while rotary drilling, and a guide plate that protrudes inward and diagonally upward from the inner surface below the cutter and strikes the head of the pile as the casing descends, guiding the cutter below the head. The auger head is rotatably provided so as the auger screw rotates, it crushes the pile from the head outwards when the cutter cuts the outer circumference of the pile. The auger screw is rotatably mounted to transport the crushed pile material, which has been crushed by the auger head, to the ground. A distinctive feature is the device for crushing and removing existing piles.

2. The existing pile crushing and removal device according to claim 1, characterized in that a plurality of cutters are provided at different distances from the tip side of the casing, the amount of protrusion of each cutter from the inner circumferential surface of the casing is greater for upper cutters, and the guide plate is provided protruding inward and diagonally upward from the inner circumferential surface below each cutter.

3. A method for crushing and removing existing piles, which are installed in the ground and connected vertically by a joint, by an auger method that performs excavation by rotating the inner auger screw and the auger head attached to its tip and the outer casing in opposite directions, The casing has a cutter that protrudes in the direction of the central axis from the inner surface so as to be able to cut the outer circumference of the pile when inserted into the ground surrounding the pile while rotary drilling, and a guide plate that protrudes inward and diagonally upward from the inner surface below the cutter and strikes the head of the pile as the casing descends, guiding the cutter below the head. The casing is inserted into the ground surrounding the pile by rotary excavation, the outer circumference of the pile is cut by the cutter guided below the head of the pile by the guide plate, the pile is crushed from the head by the auger head, the outer circumference of the upper and lower piles sandwiching the joint is cut by the cutter, the joint is struck by the auger head to separate the joint from the pile, and the crushed pile material and the joint, crushed by the auger head, are transported to the surface by the auger screw. A distinctive method for crushing and removing existing piles.

Images