JP6587900B2 - Existing pile removal method and pile cutting device used to implement the method - Google Patents

Description

  The present invention relates to a method for lifting an existing pile buried in the ground to the ground and removing it at the time of rebuilding a building structure, and the present invention particularly relates to a large-sized large type driven into the ground. It is related with the existing pile removal method suitable for pulling up and removing the existing pile to the ground, and the pile cutting device used for implementation of the method.

  For example, building structures such as buildings, condominiums, and factories have reinforced concrete piles embedded up to the ground in order to support the load. When rebuilding this kind of building structure, it is necessary to dismantle and remove the old building, and then lift and remove the existing piles buried in the ground. In order to pull up an existing pile, it is necessary to divide the ground around the existing pile from the surrounding ground by penetrating a cylindrical casing around the existing pile. A drilling claw for excavating the ground is provided at the lower end of the casing, and the casing is axially rotated by driving an auger or a rotary all-round rotating machine while jetting high-pressure water toward the ground to collapse the ground. To excavate the ground. The casing is lowered along the existing pile while excavating the ground, and the casing is penetrated to a depth reaching the tip of the existing pile (see Patent Documents 1 and 2).

  If the edge between the ground around the existing pile and the surrounding ground is cut by the penetration of the casing, the existing pile can be lifted from the ground. In the method described in Patent Document 1, the casing is first lifted from the ground by a crane, then the tip of the wire rope suspended by the crane is hung on the upper end of the existing pile, the wire rope is wound up, and the existing pile Is pulled upward. In the method described in Patent Document 2, when the casing is pulled out from the ground by the all-around rotating machine, the existing pile is pulled out integrally with the casing.

JP 2011-26936 A JP 2001-146746 A

  However, although any of the above-described methods is effective for removing a small existing pile having a relatively short size, when the existing pile is a large pile having a long size, the method described in Patent Document 1 Is required to be lifted to a considerably high position, so that the drawing work becomes large and a large crane is required. Further, in the method described in Patent Document 2, since the existing pile is pulled up integrally with the casing, the load applied to the entire rotating machine is large, and the existing pile and the casing are integrated up to a high position above the entire rotating machine. Therefore, the drawing work becomes large and requires a large crane.

  This invention was made paying attention to said problem, and even if an existing pile is a large sized pile with a long dimension, an existing pile which can be easily removed without using a large crane It aims at providing the pile removal method and the pile cutting device used for implementation of the method.

The present invention relates to a method of lifting an existing pile buried in the ground to the ground and removing the pile, and the cylindrical casing penetrates into the ground above the existing pile and is pulled up from the ground. And a preparatory step for installing an all-round rotating machine capable of performing the above-mentioned, and the above-mentioned all-round rotating machine penetrates the casing around the existing pile to divide the ground around the existing pile from the surrounding ground and at the upper end of the existing pile A casing penetration process for exposing the existing pile from the casing, and gripping the portion exposed from the casing at the upper end portion of the existing pile by the gripping device, and then removing the existing pile from the entire circumference rotating machine until the upper end portion of the existing pile protrudes above the entire circumference rotating machine. The existing pile pull-up step that is pulled up by the above-mentioned method, and the cutting step that removes fragments of the existing pile by cutting the portion protruding from the all-around rotating machine in a state where the upper end portion of the existing pile is gripped by the gripping device were sequentially performed . rear And the existing pile pulling step of pulling the entire circumferential turning point to an upper end portion protrudes upward of the total orbiting turning point for existing pile after cutting, the state grabbing an upper end of the existing pile by the gripper or other gripping device The existing pile is removed by repeatedly performing a cutting step of cutting a portion protruding from the all-round rotating machine and removing a fragment of the existing pile.

  In the existing pile removing method according to the present invention, after the existing pile is pulled up by the all-around rotating machine until the upper end of the existing pile protrudes above the all-around rotating machine, the protruding portion of the existing pile is cut and removed. Then, with respect to the existing pile after being cut, the step of pulling up by the all-round rotating machine until the upper end protrudes above the all-round rotating machine, and the step of cutting and removing the portion protruding from the all-round rotating machine Since the existing pile is removed by repeatedly executing the above, even if the existing pile to be removed is a large pile with a long dimension, it is not necessary to pull it up to a high position, and the pulling work does not become a large-scale work. Is unnecessary. Moreover, since the cutting of the existing pile is performed on the all-round rotating machine, the cutting work is easy, and in addition, the portion protruding from the all-round rotating machine is cut while the upper end of the existing pile is gripped by the gripping device. The existing pile pieces can be transported to an appropriate place for disposal while being held by the gripping device. Furthermore, since only the existing piles are lifted while leaving the casing in the ground, the load applied to the all-round rotating machine during pulling can be reduced, and ground subsidence can be applied to the traces of the existing piles in the casing left in the ground. A filler for prevention can be injected.

  The present invention further performs a casing lifting process for lifting the casing left in the ground after the removal of the existing piles to the ground by the all-round rotating machine. In this case, only the casing is pulled up. The load on the casing is small, and the casing can be easily pulled up by a simple operation.

In a preferred embodiment, in the casing pulling-up step, a steel pipe Yatco provided with a connecting portion that can be attached to and detached from the upper end portion of the casing at the lower end portion is lowered by an all-around rotating machine, and the connecting portion is placed in the casing. And a step of pulling up the casing integrally with the yatco by an all-round rotating machine.
According to this embodiment, the casing can be easily pulled up by using a steel pipe Yatco.

  The gripping mechanism used in the implementation of the present invention is preferably one in which a gripping mechanism for gripping an outer peripheral surface of an existing pile is incorporated in a cylindrical body. It consists of a step of gripping the upper end portion of the existing pile by the gripping mechanism of the gripping device, and a step of pulling up the existing pile by the all-around rotating machine integrally with the gripping device.

  The pile cutting device of the present invention used for carrying out the above-described existing pile removing method is provided for cutting the existing pile on the all-round rotating machine installed on the ground above the existing pile. The cutter mechanism. The all-round rotating machine includes a chuck mechanism and a sub-chuck mechanism for gripping the outer peripheral surface of the casing or the existing pile at upper and lower positions around a space portion through which the casing or the existing pile is inserted, and the chuck mechanism as a shaft. A rotation mechanism for rotating and a displacement mechanism for reciprocating the chuck mechanism in the vertical direction are provided. The cutter mechanism includes a pair of linear cutting blades arranged in parallel so that the blade tips face each other across the space on the all-round rotating machine. Each of the cutting blades is supported at the end of the first diagonal position so as to freely rotate on the all-round rotating machine, and a reciprocating mechanism is connected to the end of the second diagonal position. The reciprocating mechanism is operated synchronously so that the cutting blades approach each other while maintaining a parallel state.

  According to the above-described pile cutting device, when the existing pile is pulled up by the all-around rotating machine and the upper part of the existing pile protrudes above the all-around rotating machine, the protruding portion is cut by the cutter mechanism. The existing piles are axially rotated by a rotary all-round machine, and the cutting blades approach each other while maintaining a parallel state by operating the reciprocating mechanism of the cutter mechanism in synchronization. When the cutting edge of each cutting blade comes into contact with the outer peripheral surface of the existing pile, the cutting of the existing pile is started, and the cutting of the existing pile is continued by bringing the cutting blades close to a diameter at which the existing pile can be divided.

  In a preferred embodiment, each of the reciprocating mechanisms includes a cylinder mechanism arranged in parallel with each other so as to form a parallelogram with the cutting blade, and each cylinder mechanism has a base end portion on the entire circumference rotating machine. The tip of the rod of each cylinder mechanism is connected to the second diagonal position of the cutting blade.

  According to this embodiment, the pair of cutting blades and the pair of reciprocating mechanisms can be compactly arranged in a limited area on the all-round rotating machine.

  According to this invention, even if an existing pile is a large-sized pile with a long dimension, the drawing-out operation | work of an existing pile does not become large-scale, and an existing pile can be removed easily, without using a large crane.

It is a front view which shows the procedure of implementation of the existing pile removal method of this invention. It is a front view which shows the procedure of implementation of the existing pile removal method of this invention, and follows the procedure shown by FIGS. 1-1. It is a front view which shows the procedure of implementation of the existing pile removal method of this invention, and follows the procedure shown by FIGS. 1-2. It is a front view which shows the structure of a perimeter rotary machine. It is a front view which expands and shows FIG. 1-2 (8). It is a front view which shows the structure and operating principle of the holding | grip mechanism of a holding apparatus. It is a front view which expands and shows FIG. 1-3 (11). It is a top view which shows the structure and operation | movement of the other Example of a cutter mechanism.

FIGS. 1-1 to 1-3 show an example of a procedure for carrying out the existing pile removing method of the present invention, and the existing piles buried in the vertical direction in the ground by sequentially carrying out the illustrated procedures. Raise P to the ground and remove it.
In the figure, reference numeral 2 denotes an all-round rotating machine capable of penetrating the casing 1 into the ground and pulling it up from the ground. It is installed on the ground G. The casing 1 is a tubular steel pipe, and may be a series of ones over the entire length, and a plurality of casings 11, 12, 13 according to the length of the existing piles P as shown in the illustrated example. ,... May be connected. The top casing 11 is provided with a plurality of excavating blades 15 capable of excavating the ground at the opening at the lower end.

  The all-around rotating machine 2 is also called a rotating all-around machine, an all-around rotating excavator, a tubing device, or the like. As shown in FIG. 2, a base frame 21 supported on the ground G via legs 20. And an elevating frame 22 and a chuck frame 23 provided so as to be movable up and down via a plurality of elevating cylinders 30 constituting the displacement mechanism 3 above the base frame 21. A space portion S through which the casing 1 and the existing pile P are inserted penetrates in the center of each of the base frame 21, the lifting frame 22, and the chuck frame 23. The chuck mechanism 4 for gripping the outer peripheral surface of the existing pile P, the rotation mechanism 5 for rotating the chuck mechanism 4 axially, and the displacement for reciprocating the chuck mechanism 4 along the length of the casing 1 A mechanism 3 is provided.

The elevating frame 22 is provided with the rotating mechanism 5 including a motor 50 and a speed reducer 51, and a cone 40 is attached so as to surround the space S. The cone 40 is assembled through a bearing 42 so as to be rotatable. The rotation of the motor 50 is transmitted from the speed reducer 51 to the cone 40 via a gear group (not shown). A plurality of tapered grooves 41 are formed on the inner peripheral surface of the cone 40, and the chuck mechanism 4 is configured by providing a plurality of wedge-shaped chucks 43 corresponding to the respective tapered grooves 41.
Each chuck 43 is suspended from a rotating body 45 provided on the chuck frame 23 via a bearing 44, and moves relatively up and down by the expansion and contraction of the rod of the chuck cylinder 46. From this, the casing 1 and the cone 40 During this time, the chuck 43 is inserted and pulled out, and the casing 1 is brought into a gripping state or released.

  Further, the base frame 21 is provided with a belt-like sub chuck 47 that clamps and grips the outer periphery of the casing 1. The sub chuck mechanism 49 includes the sub chuck 47 and a sub chuck cylinder 48 that opens and closes the sub chuck 47. Is configured. The chuck mechanism 4 and the sub chuck mechanism 49 can grip not only the casing 1 but also the outer peripheral surface of the existing pile P.

  Although the details will be described later on the above-described all-round rotating machine 2, a hydraulically driven cutter mechanism 6 for cutting the upper end portion of the existing pile P that penetrates the space S and protrudes onto the all-around rotating machine 2 is described below. Is installed, and the cutter mechanism 6 and the all-around rotating machine 2 constitute a pile cutting device. In addition, the cylinder which comprises the cutter mechanism 6, and the cylinder of each other part are hydraulic cylinders, Comprising: The reciprocating motion of a piston rod is controlled by the hydraulic fluid which flows through a hydraulic circuit. In addition, the cutter mechanism 6 constituting the pile cutting device can adopt various embodiments, and in addition to the one shown in FIGS. 3 and 5 used in this embodiment, 6 can be employed (details will be described later).

1-1 (1) to (4) show a casing penetration process following the above preparation process. The casing 1 is penetrated around the existing pile P by the all-around rotating machine 2, and the periphery of the existing pile P is shown. The ground is divided from the surrounding ground.
1-1 (1) shows a state in which the leading casing 11 is supported by the all-round rotating machine 2, and the excavating blade 15 at the lower end of the casing 11 is inserted to the position of the upper end portion of the existing pile P. Yes. The casing 11 has an outer peripheral surface held by the chuck mechanism 4 of the all-round rotating machine 2, and the rotating mechanism 5 rotates the chuck mechanism 4 to rotate the casing 11, and the ground is excavated by the excavating blade 15. Although not shown, when excavating the ground, the ground is collapsed by spraying high-pressure water toward the ground. The displacement mechanism 3 displaces the chuck mechanism 4 downward, whereby the casing 11 enters deep into the ground while excavating the ground. When the outer peripheral surface of the casing 11 is gripped by the sub chuck mechanism 49, the chuck mechanism 4 can release the grip of the casing 11, and the displacement mechanism 3 displaces the chuck mechanism 4 upward to grip the casing 11. The position is changed.

  FIG. 1-1 (2) shows a point in time when the penetration of the leading casing 11 is completed. At this time, the upper end portion of the casing 11 slightly protrudes upward from the all-around rotating machine 2, and the lower end portion of the second casing 12 suspended from the crane is connected to the upper end portion of the casing 11. 1-1 (3) shows a state in which the third casing 13 is connected to the second casing 12, and the casings 12 and 13 are displaced downward so that the leading casing 11 is further deepened into the ground. When it penetrates, the lower end part of the top casing 11 has approached the lower end part of the existing pile P, leaving some depth.

  The leading casing 11 is provided at the upper end, and the intermediate casings 12 and 13 are provided at the lower end and the upper end, respectively, with detachable connecting parts (not shown). Any one of various known mechanisms is adopted as the mechanism of the connecting portion.

  1-1 (4) shows that a steel pipe YATCO 100 having a connecting portion detachable from the casing at the lower end is connected to the upper end of the third casing 13, and this YATCO 100 is rotated all around. The state lowered by the machine 2 is shown. At this time, the leading casing 11 reaches the lower end of the existing pile P, and the ground around the existing pile P is divided from the surrounding ground. As a result, the existing pile P and the surrounding ground are in circulation with the casing 1. (Fig. 1-1 (4)).

  Next, when the connecting portion at the lower end of the YATCO 100 is removed from the upper end portion of the third casing 13 and the YATCO 100 is raised by the all-around rotating machine 2, the upper end portion of the existing pile is exposed from the casing 13. Next, the cylindrical body 70 constituting the gripping device 7 is lowered by the all-around rotating machine 2. When the lower end portion of the cylindrical body 70 is lowered to a position where it abuts on the upper end portion of the casing 13, the lower end portion of the cylindrical body 70 covers the exposed portion of the upper end portion of the existing pile P (FIG. 1-2). 6)). The gripping device 7 has a hydraulic swivel 96 at the upper end and is suspended by a wire 95. The wire 95 is supported by a hook 98 suspended from a crane 97.

  FIGS. 1-2 (7) and (8) have shown the existing pile pulling-up process following said casing penetration process. In this process, the upper end of the existing pile P is grasped by the gripping device 7, and the existing pile P is pulled up by the all-around rotating machine 2 until the upper end of the existing pile P protrudes above the all-around rotating machine 2. In FIG. 1-2 (7), the chuck mechanism 4 of the all-round rotating machine 2 holds the outer peripheral surface of the cylindrical body 70 of the gripping device 7, and the displacement mechanism 5 rotates the cylindrical body 70 by the rotating mechanism 5. 3, the cylindrical body 70 is displaced upward, and the existing pile P is pulled up integrally with the cylindrical body 70. After the cylindrical body 70 is pulled out above the all-around rotating machine 2, the chuck mechanism 4 of the all-around rotating machine 2 directly grips the outer peripheral surface of the existing pile P as shown in FIG. Similarly, while the existing pile P is rotated, the existing pile P is displaced upward by the displacement mechanism 3 and the existing pile P is pulled up.

  FIG. 3 is an enlarged view showing a state where the upper end portion of the existing pile P is pulled up by the all-around rotating machine 2. The existing pile P penetrates the space S of the all-round rotating machine 2 up and down, and an appropriate length of the upper end projects from the all-around rotating machine 2. The upper end portion of the existing pile P is gripped by the gripping device 7, and the gripping device 7 is supported by a hook 98 suspended from the crane 97. The gripping device 7 includes a gripping mechanism 71 that grips an upper end portion of an existing pile P in a lower portion inside a cylindrical body 70.

  As shown in FIGS. 4 (1) and (2), the gripping mechanism 71 of this embodiment has a pair of semi-cylindrical gripping pieces 72a and 72b facing each other and the gripping pieces 72a and 72b approaching each other. , And a pair of pressing mechanisms 73a and 73b for reciprocating displacement in the separating directions. The inner peripheral surface of each gripping piece 72a, 72b is formed in a curved shape along the outer peripheral surface of the existing pile P so as to come into surface contact with the outer peripheral surface of the existing pile P. Each gripping piece 72a, 72b is supported by a plurality of tension springs 74a, 74b mounted on the inner surface of the cylindrical body 70, whereby each gripping piece 72a, 72b is urged away from each other. Yes.

  The pressing mechanisms 73a and 73b are constituted by a wedge mechanism using a hydraulic cylinder 75 as a drive source, and are provided with wedge pieces 78 and 79 at the tips of rods 76 and 77 protruding in the opposite direction. Each wedge piece 78, 79 of one pressing mechanism 73a has an inner inclined surface in contact with the upper end and lower end of the gripping piece 72a, and each wedge piece 78, 79 of the other pressing mechanism 73b has an inner inclination. When the surfaces are in contact with the upper end and the lower end of the gripping piece 72b and both the rods 76 and 77 are pulled together in the pressing mechanisms 73a and 73b, the wedge pieces 78 and 79 are held in the gripping pieces 72a and 72b. To bring them closer to each other (see FIG. 4 (2)). When both the rods 76 and 77 protrude at the same time, the pressing force by the wedge pieces 78 and 79 is released, and the gripping pieces 72a and 72b are pulled apart by the tension springs 74a and 74b (see FIG. 4 ( 1)).

FIGS. 1-2 (8)-(9) have shown the cutting process following the said existing pile pulling-up process. In this step, the portion protruding upward from the all-around rotating machine 2 while the upper end of the existing pile P is gripped by the gripping device 7 is cut and removed by the cutter mechanism 6.
As shown in FIG. 3, the cutter mechanism 6 is installed on the all-round rotating machine 2, and includes a pair of reciprocating mechanisms 61a and 61b made of hydraulic cylinders, rods 62a of the reciprocating mechanisms 61a and 61b, And cutting blades 63a and 63b attached to the tip of 62b. The reciprocating mechanisms 61 a and 61 b are positioned and fixed so that the cutting blades 63 a and 63 b face each other with the space S of the all-around rotating machine 2 interposed therebetween. Each cutting blade 63a, 63b advances toward the center of the existing pile P that passes through the space S and rotates about the axis, and thereby cuts the existing pile P.

  In FIG. 3, reference numeral 8 denotes a detent mechanism provided on the all-round rotating machine 2, and a rod-like stopper 83 provided at the tip of the rod 82 of the vertically installed hydraulic cylinder 81 and the gripping device 7. And a rotation stopper 84 attached to the hydraulic swivel 96 provided to the hydraulic swivel 96 to prevent the hydraulic swivel 96 from rotating with the cylindrical body 70 of the gripping device 7. In FIG. 3, reference numeral 110 denotes a hydraulic unit that controls the operation of the hydraulic oil to and from each part of the hydraulic cylinder.

  FIG. 1-2 (9) shows a state immediately after the existing pile P is cut by the cutter mechanism 6, and a piece P 1 of the existing pile P is held by the holding mechanism 71 of the holding device 7. The gripping device 7 is carried to an appropriate position by the crane 97 while holding the fragment P1, and opens the gripping mechanism 71 to discard the fragment P1.

  1-2 (10) to FIG. 1-3 (11) show an operation process following the above-described cutting process. In this work process, an existing pile pulling process in which the upper end of the existing pile P after cutting is pulled up by an appropriate length until the upper end protrudes above the entire rotary machine 2, and the entire rotary machine 2 The cutting process of cutting and removing the more protruding portion by the cutter mechanism 6 is repeatedly performed.

  1-2 (10), the chuck mechanism 4 of the all-round rotating machine 2 directly grips the outer peripheral surface of the existing pile P after cutting, and moves the existing pile P upward by the displacement mechanism 3 while rotating the existing pile P. The existing pile P is pulled up by being displaced. When the pulling of the existing pile P is finished, next, the upper end portion of the existing pile P is gripped by the gripping mechanism 91 of the second gripping device 9, and then the cutter mechanism 6 is operated (FIGS. 1-3 (11)). .

  FIG. 5 shows an enlarged view of the state in which the upper end portion of the existing pile P after being cut is gripped by the second gripping device 9. The existing pile P penetrates the space S of the all-round rotating machine 2 up and down, and an appropriate length of the upper end projects from the all-around rotating machine 2. The upper end portion of the existing pile P is gripped by the second gripping device 9, and the second gripping device 9 is supported by a hook 98 suspended from the crane 97. The second gripping device 9 includes a cylindrical body 90 in which a gripping mechanism 91 that grips the upper end portion of the existing pile P is incorporated. The gripping mechanism 91 has the same configuration as the gripping mechanism 71 of the gripping device 7 and is not different from those shown in FIGS. 4 (1) and (2). . The cylindrical body 90 of the second gripping device 9 is shorter than the cylindrical body 70 of the gripping device 7, so that when the second gripping device 9 grips the upper end of the existing pile P, the crane 97 There is no need to lift the gripping device 9 high. The gripping device 7 can be used in place of the second gripping device 9.

  The existing pile P buried in the ground can be removed by repeatedly executing the above-described existing pile pulling process of FIG. 1-2 (10) and the cutting process of FIG. 1-3 (11). After removal of the existing pile P, the casing 1 is left in the ground. After using the casing 1 to inject a filler for preventing ground subsidence into the trace of the existing pile P, the casing 1 is removed. The casing is pulled up to the ground by carrying out the casing pulling process shown in FIGS. 1-3 (12) and (13). The casing pulling-up step is a step of pulling up the casing 1 to the ground by the all-round rotating machine 2 and lowering the steel pipe Yatco 100 by the all-around rotating machine 2 and connecting it to the upper end of the casing 1 (FIG. 1-3 (12)) and a step of lifting the casing 1 to the ground together with the YATCO 100 by the all-around rotating machine 2 (see FIG. 1-3 (13)).

  1-3 (12) shows a state in which the YATCO 100 is supported by the all-around rotating machine 2. FIG. The outer surface of the YATCO 100 is gripped by the chuck mechanism 4 of the all-round rotating machine 2, and the YUTCO 100 descends when the displacement mechanism 3 displaces the chuck mechanism 4 downward, and is connected to the upper end of the casing 1. be able to.

  1-3 (13), the outer surface of the YATCO 100 is gripped by the chuck mechanism 4 of the all-round rotating machine 2, and the YATCO 100 and the casing 1 are integrated as the rotating mechanism 5 rotates the check mechanism 4. The casing 11 is pulled up together with the yatco 100 by rotating and displacing the chuck mechanism 4 upward by the displacement mechanism 3. After the Yatco 100 is pulled up and separated from the casing 1, the casings 11 to 13 are sequentially pulled up by the all-around rotating machine 2 in the same manner.

  FIG. 6 (1) shows a pile cutting device of another optimum embodiment used for carrying out the existing pile removing method of the present invention. The illustrated pile cutting device includes the all-round rotating machine 2 installed on the ground G above the existing pile P, and a cutter mechanism 6 provided for cutting the existing pile P on the all-round rotating machine 2; The all-round rotating machine 2 includes a chuck mechanism 4, a sub-chuck mechanism 49, a rotating mechanism 5, and a displacement mechanism 3. The configuration of each mechanism is as described above, and a description thereof is omitted here.

  The cutter mechanism 6 is provided with a pair of linear cutting blades 64a and 64b arranged in parallel on the all-round rotating machine 2 so that the blade tip portions 64 covering almost the entire length across the space portion S face each other. The cutting blades 64a and 64b have the same length, and one end A1 of one cutting blade 64a and the other end B2 of the other cutting blade 64b are at the center X of the space S. The other end A2 of one cutting portion 64A and the one end B1 of the other cutting blade 64b are at a diagonal position with respect to the center X of the space S. Ends A1 and B2 of the first diagonal positions of the cutting blades 64a and 64b are rotatably supported on the all-around rotating machine 2 by pins 65a and 65b. Reciprocating mechanisms 66a and 66b are connected to the ends A2 and B1 of the second diagonal positions of the cutting blades 64a and 64b by pins 69a and 69B, respectively, and the reciprocating mechanisms 66a and 66b are respectively connected to the cutting blades. 64a and 64b operate synchronously under the control of the hydraulic unit 110 so as to approach each other while maintaining a parallel state.

  In this embodiment, each of the reciprocating mechanisms 66a and 66b is constituted by a hydraulic cylinder arranged in parallel with each other so as to form a parallelogram with each of the cutting blades 64a and 64b. The tip of the rods 68a and 68b of each hydraulic cylinder is connected to the ends A2 and B1 of the cutting blades 64a and 64b by pins 69a and 69b. Yes.

  According to the above-described pile cutting device, when the existing pile P is pulled up by the all-around rotating machine 2 and the upper part of the existing pile P protrudes above the all-around rotating machine 2, the protruding portion is cut by the cutter mechanism 6. . The existing pile P is axially rotated by the rotary all-around machine 2, and the reciprocating mechanisms 66a and 66b of the cutter mechanism 6 are operated synchronously so that the cutting blades 64a and 64b approach each other while maintaining a parallel state. . When the cutting edge 64 of each cutting blade 64a, 64b contacts the outer peripheral surface of the existing pile P, the cutting of the existing pile P is started, and the existing pile P can be divided as shown in FIG. 6 (2). The cutting blades 64a and 64b are brought close to the diameter and the cutting of the existing pile P is continued.

1, 11, 12, 13 Casing 2 All-round rotator 3 Displacement mechanism 4 Chuck mechanism 5 Rotation mechanism 6 Cutter mechanism 7, 8 Grab device 64a, 64b Cutting blade 66a, 66b Reciprocating mechanism 70, 80 Cylindrical body 71, 81 Grip mechanism 97 Crane 100 Yatco P Existing pile

Claims (6)

A method of lifting an existing pile buried in the ground to the ground and removing it, and capable of penetrating a cylindrical casing into the ground and lifting it from the ground on the ground above the existing pile. A preparatory process for installing a peripheral rotating machine, and the casing is penetrated around the existing pile by the full peripheral rotating machine to divide the ground around the existing pile from the surrounding ground and the upper end of the existing pile is exposed from the casing The existing pile that pulls up the existing pile by the all-around rotating machine until the upper end of the existing pile protrudes above the all-round rotating machine by grasping the part exposed from the casing at the upper end of the existing pile and holding the portion exposed from the casing After sequentially performing the pulling-up step and the cutting step of cutting the portion protruding from the all-around rotating machine in a state where the upper end portion of the existing pile is gripped by the gripping device and removing the fragments of the existing pile Already And the existing pile pulling step of pulling the entire circumferential turning point to an upper end portion protrudes upward of the total orbiting turning point for the pile, the entire circumference in a state of gripping the upper end of the existing pile by the gripper or other gripping device An existing pile removing method, wherein the existing pile is removed by repeatedly executing a cutting step of cutting a portion protruding from the rotating machine and removing a fragment of the existing pile.   It is the existing pile removal method of Claim 1, Comprising: The existing pile removal characterized by further performing the casing raising process which pulls up the casing left underground in the ground after the existing pile removal to the ground with the said all-around rotary machine Method.   In the casing pulling-up step, a steel pipe YATCO provided with a connecting portion that can be attached to and detached from the upper end of the casing at the lower end is lowered by an all-around rotating machine to connect the connecting to the upper end of the casing. The existing pile removing method according to claim 2, comprising a step and a step of pulling up the casing integrally with the yatco by an all-around rotating machine. The gripping device includes a cylindrical body with a gripping mechanism for gripping the outer peripheral surface of the existing pile, and the existing pile pulling step is performed by the gripping mechanism of the gripping device. The existing pile removing method according to claim 1 , comprising a step of gripping the portion and a step of pulling up the existing pile by an all-around rotating machine integrally with the holding device . An all-round rotating machine installed on the ground above the existing pile, and a cutter mechanism provided for cutting the existing pile on the all-round rotating machine, the all-around rotating machine includes a casing or an existing pile. Around the space to be inserted, a chuck mechanism and a sub-chuck mechanism for gripping the outer peripheral surface of the casing or the existing pile at upper and lower positions, a rotating mechanism for rotating the chuck mechanism, and the chuck mechanism A pair of linear cutting blades arranged in parallel so that the blade tip portions face each other across the space portion on the all-round rotating machine. Each of the cutting blades is supported at the end of the first diagonal position so as to freely rotate on the all-round rotating machine, and a reciprocating mechanism is connected to the end of the second diagonal position, respectively. Along with each reciprocating mechanism, each cutting blade Synchronization with pile cutting device operating so as to approach each other while keeping the line state. Each of the reciprocating mechanisms is composed of cylinder mechanisms arranged in parallel with each other so as to form a parallelogram with the cutting blade, and each cylinder mechanism is supported by a base end portion on an all-round rotating machine so as to freely rotate. The pile cutting device according to claim 5, wherein a tip portion of a rod of each cylinder mechanism is connected to a second diagonal position of the cutting blade .

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