JP2007009671A - Device and method for removing existing pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a removing device for an existing pile which exhibits an excellent durability and is capable of enhancing the removing workability of the existing pile by eliminating the limitation of the length of a casing to be connected to a heavy industrial machine for removing the existing pile at removing the same. <P>SOLUTION: In the removing device for an existing pile, a chuck claw 5 is rotatably mounted to the casing for removing the existing pile and a through hole 10 allowing the chuck claw 5 to get in and out is provided to chuck the end part of the existing pile 25 by driving the chuck claw 5 by means of a chuck claw drive device. When the chuck claw drive device and the casing 3 are lifted with the top sheeve device of the heavy industrial machine for removing the existing pile under this state, the two upper and lower positions P1, P2 of the chuck claw 5 are made to abut on the two inner surfaces P3, P4 of the through hole 10 by the load of the existing pile 25 to be lifted with the chuck claw 5. Furthermore, the top sheeve device has a penetration portion in a vertical direction allowing the casing 3 to be passed therethrough. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an existing pile removing device and an existing pile removing method, and more specifically, a through hole is provided in the vicinity of a tip of a casing, and a chuck claw is projected from the through hole toward the inside of the casing. In this state, the pile driving machine is lifted by the existing pile removal heavy machine, and the existing pile removal device and the existing pile are lifted and removed from the ground by lifting the casing in synchronization with the lifting. It relates to the pile removal method.

  Conventionally, the existing pile extraction device has already been provided by the applicant of the present invention (Patent Document 1).

  This existing pile extraction device holds a cylindrical casing having an inner diameter larger than the maximum outer diameter of the existing pile in a heavy machine for removing the existing pile, and is driven by a hydraulic cylinder below the casing and protrudes into the casing. In the existing pile extraction device with a chuck claw attached, a hydraulic cylinder is attached to the top of the casing, the rod end of the hydraulic cylinder and the chuck claw are connected by a connecting rod, and an arc-shaped cam groove is formed on the chuck claw. The cam groove is inserted through a shaft fixed to the lower part of the casing. Then, the chucking claw is retracted out of the casing in a substantially vertical posture by raising the connecting rod by the reduction operation of the hydraulic cylinder, and the chucking claw is in a substantially horizontal posture in the casing by lowering the connecting rod by the extension operation of the hydraulic cylinder. It is characterized by being configured so as to protrude.

According to the existing pile pulling device having the above-described configuration, since the hydraulic cylinder is attached to the upper portion of the casing, the hydraulic cylinder is extended when the casing is driven into the existing pile and the chuck pawl is protruded into the casing. Can be confirmed on the ground, and by this confirmation, it is possible to know whether or not the chuck claw has completely protruded below the existing pile. Moreover, it has the outstanding effect that an existing pile can be easily removed by making a chuck | zipper nail | claw completely project below an existing pile and raising a casing.
Patent No. 3052135

  However, in the existing pile pulling device described in Patent Document 1, the shaft supported by the casing is inserted into the cam groove of the chuck claw, and the force of the chuck claw is operated by the connecting rod so that the chuck claw is substantially horizontal in the casing. It protrudes in the posture. Therefore, the load of the existing pile and the casing driving device loaded on the chuck claw will be concentrated on the connection point between the shaft and the chuck claw and the connecting rod, which has some problems in terms of durability. ing.

  Moreover, in the conventional existing pile extracting device, the top sheave device is disposed across the casing installation position, so that the length of the casing connected to the existing pile removing heavy machine is limited. For this reason, there is also a problem that the removal work becomes complicated.

  The present invention solves such a problem, and the object is to limit the length of the casing that is excellent in durability and connected to the existing pile removing heavy machine when the existing pile is removed. It is in providing the removal method of an existing pile and the removal method of an existing pile which can improve the removal workability | operativity of an existing pile by eliminating.

  In order to achieve the above object, an existing pile removing apparatus according to the present invention is provided with an existing pile removing casing in which a chuck claw is rotatably attached and a through hole through which the chuck claw enters and exits is provided near the lower end. And a casing driving device for attaching and detaching and rotating the existing pile removal casing, and raising and lowering the casing driving device by attaching and mounting the casing driving device, and the existing pile removing casing through the casing driving device in a vertical posture or a substantially vertical posture. An existing pile removing heavy machine and a chuck claw driving device for rotating the chuck claw to move the chuck claw out of the through hole into the casing, and the existing pile removing heavy machine When lifting the existing pile removal casing through the driving device and the casing driving device, the chuck claw driving device In an existing pile removal device that chucks and lifts an end of an existing pile with a driven chuck claw and removes it from the ground, when the load on the existing pile is loaded on the chuck claw, These two positions are in contact with the upper and lower two inner surfaces of the through hole, and the chuck claw is detachably assembled to the chuck claw driving device.

  Thus, when the load of both the existing pile and the casing driving device is loaded on the chuck claw, the two upper and lower positions of the chuck claw abut against the two upper and lower inner surfaces of the through-hole, It can be distributed to the upper and lower two inner surfaces of the through hole through the upper and lower positions of the chuck claw. Therefore, it is possible to improve the durability of the chuck claw driving device by avoiding that the load is concentrated and applied only to the chuck claw driving device side.

  In addition, since the chuck pawl is detachably assembled to the chuck pawl drive device, when the chuck pawl is worn, the chuck pawl can be easily replaced, improving workability. it can.

  Moreover, in the existing pile removal apparatus which concerns on this invention, it is preferable that the said chuck | zipper claw is curving in the rotation direction. According to this, when the chuck claw is rotated by the chuck claw driving device, the chuck claw can be smoothly put in and out of the through hole to ensure smooth operation.

Furthermore, in the existing pile removing apparatus according to the present invention, it is preferable that the chuck pawl includes a blade portion for cutting an existing pile. According to this, when the existing pile is large in diameter and heavy per unit length, it can be removed while cutting the existing pile with the blade for cutting the existing pile, so it takes heavy equipment for existing pile removal Weight burden can be reduced.

  Further, in the existing pile removing apparatus according to the present invention, the top sheave device provided in the existing pile removing heavy machine for raising and lowering the casing driving device includes an upper and lower portion that allows penetration of the existing pile removing casing. A through portion in the direction is formed. According to this, the penetration of the existing pile removal casing is allowed by the vertical penetration portion, so that a casing longer than the conventional one is attached and detached and rotated by the casing drive device without being obstructed by the top sheave device. In addition, since it can be pulled up by the top sheave device, the restriction on the length of the casing is eliminated and the construction period can be shortened.

  On the other hand, in order to achieve the above object, the method for removing an existing pile according to the present invention is a casing drive in which an existing pile removing heavy machine is installed in the vicinity of the existing pile and mounted on the existing pile removing heavy machine so as to be movable up and down. The existing pile removal casing is attached to the device so that it can be attached and detached and rotated, and is made to correspond to the upper level of the existing pile. The existing pile removal casing is rotated by the casing drive device and the existing pile removal casing is surrounded by the casing. However, when the soil around the existing pile is drilled and dug down to the predetermined depth, the chuck claw is driven by the chuck claw driving device, and the chuck claw is provided in the vicinity of the lower end of the existing pile removal casing. It projects into the inside of the existing pile removal casing from the hole to chuck the underground end of the existing pile, and the existing pile removal heavy machine and the casing drive device In the existing pile removal method in which the existing pile removal casing is lifted by removing the existing pile removal casing, when the existing pile removal casing is lifted together with the casing driving device by the existing pile removal heavy machine, By bringing the two positions into contact with the two upper and lower inner surfaces of the through hole, the load of the existing pile loaded on the holding portion of the chuck claw is distributed to the two upper and lower positions of the chuck claw. The chuck claw is supported so as to be replaceable with respect to the chuck claw driving device.

  Thus, when the load of both the existing pile and the casing driving device is loaded on the chucking portion of the chuck claw, the two upper and lower positions of the chuck claw abut on the two upper and lower inner surfaces of the through hole, thereby Since both loads can be distributed to the upper and lower two inner surfaces of the through hole via the upper and lower two positions of the chuck claw, the load is prevented from being concentrated only on the chuck claw driving device side. The durability of the nail drive device can be improved.

  Moreover, since the chuck pawl is supported so as to be replaceable with respect to the chuck pawl driving device, the chuck pawl can be easily replaced when the chuck pawl is worn, and the optimum working conditions can be easily obtained. Therefore, workability can be improved.

Further, in the existing pile removal method according to the present invention, the soil around the existing pile is drilled from the deepest part of the existing pile by the existing pile removal casing and dug down, and the chuck claw is driven by the chuck claw driving device. By driving, chucking the lowermost underground portion of the existing pile and removing the existing pile at a time, the work period can be shortened.

Furthermore, in the removal method of the existing pile according to the present invention, when removing a heavy existing pile (an existing pile having a large diameter) having a heavy weight per unit length, the existing pile is removed by a casing for removing the existing pile. The soil of the existing pile is drilled to the middle of the existing pile and dug down, and the chuck claw equipped with the blade for cutting the existing pile is driven by the chuck claw driving device to divide the existing pile and What is necessary is just to repeat the operation | work which chucks the lower end part of an existing pile and removes the said existing pile. According to this, a heavy weight existing pile can be removed, reducing the weight burden concerning the heavy machine for existing pile removal.

  On the other hand, in order to achieve the above object, the existing pile removing method according to the present invention is a casing drive in which an existing pile removing heavy machine is installed in the vicinity of the existing pile and is mounted to the existing pile removing heavy machine so as to be movable up and down. The existing pile removal casing is attached to the device so that it can be attached and detached and rotated, and is made to correspond to the upper level of the existing pile. The existing pile removal casing is rotated by the casing drive device and the existing pile removal casing is surrounded by the casing. However, when the soil around the existing pile is drilled and dug down to the predetermined depth, the chuck claw is driven by the chuck claw driving device, and the chuck claw is provided in the vicinity of the lower end of the existing pile removal casing. It projects into the inside of the existing pile removal casing from the hole to chuck the underground end of the existing pile, and the existing pile removal heavy machine and the casing drive device In the existing pile removal method, in which the existing pile removal casing is lifted by removing the existing pile removal casing, the step of attaching the existing pile removal casing to the casing drive device so as to be attachable / detachable and rotationally driven, and the existing pile removal heavy machine The vertical direction formed in the top sheave device for raising and lowering the casing driving device provided in the heavy machine for removing the existing pile in at least one of the step of lifting the casing for removing the existing pile together with the casing driving device The existing pile removing casing is made to penetrate through the through-holes.

  In this way, by passing the existing pile removing casing through the vertical penetrating portion, a casing longer than the conventional one can be attached and detached and rotated by the casing driving device without being obstructed by the top sheave device. Moreover, since it can be pulled up by the top sheave device, the restriction on the length of the casing is eliminated and the construction period can be shortened.

According to the present invention, the load of both the existing pile loaded on the chuck claw and the casing driving device can be distributed to the two upper and lower inner surfaces of the through hole via the two upper and lower positions of the chuck claw. It is possible to improve the durability of the chuck claw drive device by avoiding concentrated loading only on the claw drive device side, and to easily hold the chuck claw in the optimum state, making it easy to work with. Can be improved.
Moreover, the construction period can be shortened by eliminating the restriction on the length of the casing connected to the heavy machine for removing the existing pile when the existing pile is removed.

  Hereinafter, preferred embodiments of an existing pile removing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is an overall side view showing an embodiment of an existing pile removing apparatus according to the present invention. In this figure, an existing pile removing device 1 includes an existing pile removing heavy machine 2, an existing pile removing casing 3, a casing driving device 4, a pair of left and right chuck claws 5, 5, and these chuck claws 5, 5. Are provided with a pair of left and right chuck claw driving devices 6, 6, a swivel joint 7, and a top sheave device 8.

  The existing pile removing heavy machine 2 is constituted by a crawler crane, and has a function of moving the casing driving device 4 up and down and holding the existing pile removing casing 3 in a vertical posture or a substantially vertical posture through the casing driving device 4. ing. A leader mast 2a is attached to the front side so that the angle of the vertical axis can be adjusted.

  The existing pile removal casing 3 has a function of drilling and digging up the soil around the existing pile 25 while surrounding the existing pile 25, and is a cylinder made of a steel pipe having an inner diameter larger than the outer diameter of the existing pile 25. It is configured in a split structure in which a plurality of casing units are added up and down by a series of structures of a predetermined length or connected by a connecting portion 3a and removably connected, and the length of the existing pile (buried depth) Accordingly, the existing pile removing casing 3 having a series of structures or divided structures is appropriately selected and used. And the swivel joint 7 is provided in the upper end part, and as shown in FIG. 2 and FIG. 3, a plurality of small excavation blades 9a for drilling and digging the soil around the existing piles at the lower end part, The excavation part 9 consisting of a plurality of large excavation blades 9b is provided, and in the vicinity of the upper side of the excavation part 9, a pair of through holes 10 and 10 that penetrate the peripheral wall of the casing 3 at equal intervals in the circumferential direction are provided. A pair of left and right chuck claws 5 and 5 are provided in and out of the through holes 10 and 10. In FIG. 3, reference numeral 28 denotes a fluid pumping tube for injecting a fluid such as air, water, a mixture of cement and bentonite, and in the region near the lower end of the casing 3, as shown in the example of the casing 3 Is disposed outside the casing 3 and is connected to the swivel joint 7 above the casing 3.

  Specifically, the through holes 10 are provided as shown in FIG. That is, a pair of through holes 11 and 11 are provided through the peripheral wall in the vicinity of the lower end of the existing pile removing casing 3 at equal intervals in the circumferential direction (however, only one through hole 11 is shown in FIG. 4). ), The through holes 11 and 11 are closed by a support plate 12, and a through hole 10 is provided in the support plate 12.

  In FIG. 1, a casing drive device 4 is for attaching and detaching and rotating an existing pile removing casing 3, and an annular non-rotating portion 4A provided with a prime mover 4a and a lower side of the non-rotating portion 4A. An annular rotating part 4B that is freely connected to rotate around the vertical axis C and is rotated by a prime mover 4a is provided. The non-rotating part 4A is attached to the rail 2b of the leader mast 2a via a slider 13 so as to be movable up and down. The existing pile removing casing 3 is inserted and held in the hollow portion communicating with the upper and lower portions of the non-rotating portion 4A and the rotating portion 4B, so that the existing pile removing casing 3 is inserted by the existing pile removing heavy machine 2 via the casing driving device 4. Is held in a vertical posture or a substantially vertical posture.

  In addition, a plurality of chucks 4b are provided at equal intervals in the circumferential direction on the rotating portion 4B, and when the existing pile removing casing 3 is chucked by these chucks 4b, the existing piles are removed by the motor 4a of the casing driving device 4. The casing 3 for rotation can be driven to rotate in the forward and reverse directions around the longitudinal axis C, and the casing 3 for removing the existing pile can be raised and lowered according to the raising and lowering of the casing driving device 4. When the chucking of the pile removing casing 3 is released, only the casing driving device 4 can be allowed to move up and down.

  The pair of left and right chuck claws 5, 5 are made of steel, and as shown in FIGS. 4 and 5, a forward curved portion 5A is provided on the free end side, and a retaining plate 5a is attached to the distal end thereof, and the proximal end portion is provided. A shaft 14 composed of a bolt is inserted into the provided through hole 5b, and this shaft 14 is slidably inserted into an upward arcuate elongated hole 15a formed on the free end side of the first connecting body 15. The base end portion of the first connecting body 15 is rotatably connected to the lower end portion of the second connecting body 18 via a shaft 17 constituted by a bolt, and the upper end portion of the second connecting body 18 is connected via the connecting plate 19. The chuck claw driving device 6 (see FIG. 1) is connected to the tip of the output rod 6a. 4A, the center of curvature of the arc-shaped long hole 15a is set at the axis of the shaft 17. As shown in FIG.

  On the other hand, the pair of left and right chuck claws 5, 5 is inserted into the through hole 10 of the support plate 12 from the outside of the existing pile removal casing 3 with the free end side in a state where the retaining plate 5 a is removed, and the inside of the casing 3. By attaching the retaining plate 5a to the projecting end portion, the chuck claws 5 and 5 are prevented from coming out of the through hole 10 as shown in FIG. Naturally, the clearance in the width direction between the chuck claw 5 and the through hole 10 is set to an appropriate value in order to ensure the accuracy of the operation of moving the chuck claw 5 out of the through hole 10 into the casing 3.

  The pair of left and right chuck claws driving devices 6 and 6 shown in FIG. 1 actuate the chuck claws 5 and 5 (rotate about the axis 14 in FIG. 4) to move the chuck claws 5 and 5 from the through hole 10 to the casing 3. The hydraulic cylinder 6A attached to the inner surface of the casing 3 in the vicinity of the upper end of the casing 3, and the connection for connecting the tip of the piston rod 6B of the hydraulic cylinder 6A and the upper end of the output rod 6a to each other And a member 6C.

  The swivel joint 7 in FIG. 1 is oil, air, water, cement, and bentonite in a state that prevents twisting, entanglement, and fluid leakage of pipes, hoses, tubes, etc. disposed on the existing pile removal casing 3 side. For supplying fluid such as a mixture from the primary side (fixed side) to the secondary side (rotation side), and a secondary side (rotation side) pressure oil circulation high-pressure hose disposed in the casing 3 ( (Not shown) is connected to the hydraulic cylinder 6A, and the casing 3 is provided with the fluid pumping tube 28 as a secondary (rotating side) fluid passage.

  The top sheave device 8 shown in FIG. 1 is for moving the casing drive device 4 up and down, and is horizontally attached to the top of the leader mast 2 a in the existing pile removing heavy machine 2. 6 and 7, the projection plane shape including the main body portion 8A and the branch portions 8B and 8C extending in a bifurcated manner at the tip of the main body portion 8A is substantially Y-shaped. Between the plurality of sheave groups 20 installed on the upper surfaces of the main body 8A and the branching sections 8B and 8C and the pair of left and right lower sheaves 21 installed on the non-rotating section 4A of the casing drive device 4. The wire rope 22 is provided. 1 and 6, only one lower sheave 21 is shown for convenience of illustration. Further, a bracing ring 23 is mounted between the branch portions 8B and 8C, and a vertical penetration portion 24 that allows penetration of the existing pile removal casing 3 is formed on the inner peripheral portion thereof.

  The sheave group 20 includes a first vertical sheave 20A, a first horizontal sheave 20B, and a second horizontal sheave 20C that are installed on the upper surface of the main body portion 8A, and a first vertical sheave 20D that is installed on one branching portion 8B side. The second vertical sheave 20E, the third vertical sheave 20F, and the first vertical sheave 20G and the second vertical sheave 20H installed on the other branching portion 8C side, and the wire mounted on the existing pile removing heavy machine 2 The wire rope 21 extending from the rope winding / unwinding device (not shown) is a first vertical sheave 20A on the main body portion 8A → first horizontal sheave 20B → first vertical sheave 20D on the one branching portion 8B side → below the one. Sheave 21 → second vertical sheave 20E on one branch 8B side → third vertical sheave 20F on one branch 8B side → second horizontal sheave 20C → first vertical sheave 20G on the other branch 8C side → one Lower sheave 21 ( Shown optional) → passed over in the order of the second vertical sheave 20H of the other branch portion 8C side.

  Below, one Embodiment of the removal construction method of the existing pile by the existing pile removal apparatus 1 of the said structure is described. In the present embodiment, the existing pile removing casing 3 having a predetermined length and having a long structure is used.

First, as shown in FIG. 1, the existing pile removing heavy machine 2 is installed in the vicinity of the existing pile 25, and the existing pile removing casing 3 is attached to the casing driving device 4 that is mounted on the existing pile removing heavy machine 2 so as to be movable up and down. The casing 3 is attached so as to be attachable / detachable and rotatable, and the casing 3 is made to correspond to the upper part of the existing pile 25 concentrically. Prior to this step, the existing pile 25 is cued in advance as indicated by a two-dot chain line.

  Next, the casing 3 for removing the existing pile is rotated by the casing driving device 4. In this case, the weight of the casing driving device 4 is added to the existing pile removing casing 3 by slightly loosening the wire rope 22 of the top sheave device 8. Therefore, as shown in FIG. 8A, the casing 3 surrounds the existing pile 25 and removes the soil around the existing pile 25 by the excavation blade 9a and the large excavation blade 9b (see FIG. 3) in the excavation part 9. Drill and dig.

  When the frictional resistance between the casing 3 and the existing pile 25 increases as the excavation progresses, the chuck pawl driving devices 6 and 6 are actuated a little, and the tip retaining plate 5a of the chuck pawls 5 and 5 as shown in FIG. Is rotated inward to a position approaching the existing pile 25, and the casing 3 is moved up and down via the casing driving device 4 by the operation of the top sheave device 8 while maintaining the rotation of the casing 3. Thereby, the friction resistance of the existing pile 25 surrounding surface can be eliminated, and a free state suitable for removing the existing pile 25 can be obtained.

  When the chuck pawls 5 and 5 are further lowered to the lower side of the bottom portion (the bottom end portion of the ground) 25a of the existing pile 25 by further excavation, the chuck pawl drive devices 6 and 6 are further operated, and FIG. ), The chuck claws 5 and 5 are projected to the lower side of the bottom portion (the bottom end portion of the ground) 25a of the existing pile 25. In this state, when the casing 3 is pulled up via the casing driving device 4 by the operation of the top sheave device 8, the underground end 25 a of the existing pile 25 is chucked by the chuck claws 5, 5 as shown in FIGS. Is chucked to the state shown in FIG. 10A, and the existing pile removal casing 3 is lifted together with the casing driving device 4 in the order of FIGS. 10B, 10C, and 10D. The pile 25 can be removed from the ground. 10 (b) and 10 (c), 27 is a mixture of cement and bentonite (cement milk) injected into the cavity from which the existing pile 25 has been removed, and the fluid pumping tube shown in FIG. 28.

  As shown in FIG. 8 (d) and FIG. 9, the underground end 25 a of the existing pile 25 is chucked by the chuck claws 5, 5, and both the existing pile 25 and the casing driving device 4 are attached to the chuck claws 5, 5. When a load is applied, the upper and lower positions P1 and P2 of each chuck claw 5 abut against the upper and lower inner surfaces P3 and P4 of the through-hole 10 as shown in FIG. For this reason, the load of the said both 25 and 4 can be disperse | distributed to the upper and lower two inner surfaces P3 and P4 of the through-hole 10 via the upper and lower positions P1 and P2 of the chuck claws 5 and 5. Therefore, it is possible to avoid the load of both the claws 25 and 4 being concentrated on the chuck claw driving devices 6 and 6 side, that is, the shafts 14 and 17 and the output rod 6a. Can be improved.

As in the above embodiment, the soil around the existing pile 25 is drilled down from the underground lowermost end portion 25a of the existing pile 25 by the existing pile removing casing 3, and is then dug down. The method of driving the chuck claws 5 and 5 to chuck the bottom end 25a in the ground of the existing pile 25 and remove the existing pile 25 at a time is a lightweight with a weight per unit length or less. It is suitable for the removal of the existing pile 25, and if it is such an existing pile 25, a construction period can be shortened by removing this at once. However, if an attempt is made to remove and remove the existing heavy pile 25 having a large weight per unit length (existing pile having a large diameter) at once, a heavy load is imposed on the existing pile removing heavy machine 2 and the top sheave device 8. Therefore, it is not preferable. Therefore, the embodiment of the construction method for removing the heavy existing pile 25 having a heavy weight per unit length will be described next.

  In this embodiment, as shown in FIG. 11, a chuck claw 5 having an existing pile cutting blade portion 26 is used. That is, as shown in FIG. 12 (a), while enclosing the existing pile 25 with the casing 3 to which the chuck claws 5 and 5 having the blade portion 26 for cutting the existing pile are attached, With the excavating blade 9b (see FIG. 3), the soil around the existing pile 25 is drilled and dug. When excavating to the middle of the existing pile 25 (for example, 1/3 or 1/2 of the depth embedded in the existing pile 25), the chuck claw driving devices 6 and 6 are operated to chuck as shown in FIG. The claws 5 and 5 are protruded into the casing 3. Thereby, the blade part 26 for existing pile division cuts the reinforcing bar 29 located in the outer peripheral area of the existing pile 25. After the rebar 29 is cut, the existing pile 25 is completely divided (cut) as shown in FIG. 12C by the wedge action of the chuck claws 5 and 5. Here, when the lower end portion 25b of the existing pile 25 higher than the dividing portion is chucked by the chuck claws 5 and 5 and the casing 3 is pulled up via the casing driving device 4 by the operation of the top sheave device 8, the dividing portion is The existing existing pile 25 can be removed from the ground. By repeating such a process, the heavy pile 25 can be removed while reducing the weight burden on the heavy machine 2 for removing the existing pile.

  In addition, the chuck claws 5 and 5 are rotated in the rotation direction with the shaft 14 as the rotation center, as is apparent from FIGS. 2, 4 (a), 5 (c), 9, and 11 (c). It is preferable to be curved. With this configuration, when the chuck claws 5 and 5 are rotated by the chuck claw driving devices 6 and 6, the chuck claws 5 and 5 can be smoothly put in and out of the through hole 10 on the casing 3 side. Smooth operation can be ensured.

  Furthermore, in the existing pile removing device 1 according to the present invention, as shown in FIGS. 6 and 7, the top sheave device 8 provided in the existing pile removing heavy machine 2 to raise and lower the casing driving device 4 includes: Since the penetration part 24 of the up-down direction which accept | permits the penetration of the existing pile removal casing 3 is formed, penetration of the existing pile removal casing 3 is permitted by the penetration part 24, so that it is longer than before. The casing 3 can be attached / detached and rotated by the casing driving device 4 without being obstructed by the top sheave device 8 and can be pulled up by the top sheave device 4, so that the restriction on the length of the casing 3 is eliminated. The construction period can be shortened.

  FIG. 13 shows a first modification of the chuck claw driving device 6 and uses a wire 6d instead of the output rod 6a of the above embodiment. The wire 6d is a casing after its tip is connected to the shaft 17. 3 is hung on the sheave 6e attached in the vicinity of the lower end of 3 and the presser sheave 6f is hidden and extended upward, and the upper end (not shown) is connected to, for example, the piston rod 6B of the hydraulic cylinder 6A shown in FIG. Even with this configuration, the chuck claws 5 and 5 can be operated in the same manner as the chuck claws 5 and 5 described in the above embodiment, and the same operation and effect as the above embodiment can be obtained. The number of parts on the 5 side can be reduced, and the driving force of the chuck claws 5 and 5 can be reduced. Further, the chuck claw 5 shown in FIG. 13B can be forcibly returned to the state shown in FIG. In FIG. 13, the same parts as those in FIG. 4A and FIG.

  FIG. 14 shows a second modification of the chuck claw driving device 6 in which a wire 6d is used instead of the output rod 6a of the above embodiment, and the posture of the chuck claw 5 is inverted up and down. Then, the wire 6d is connected to the shaft 17 and then extends upward with a holding sheave 6f attached to the casing 3, and an upper end (not shown) of the hydraulic cylinder 6A shown in FIG. Connected to the piston rod 6B. Even with this configuration, the chuck claws 5 and 5 can be operated in the same manner as the chuck claws 5 and 5 described in the above embodiment, and the same operation and effect as the above embodiment can be obtained. The number of parts on the 5 side can be reduced, and the driving force of the chuck claws 5 and 5 can be reduced. In FIG. 14, the same parts as those in FIGS. 4A and 9 are given the same reference numerals, and description of overlapping structures and operations will be omitted.

  In the first embodiment, both the shaft 14 that connects the chuck claw 5 and the first connecting body 15 and the shaft 17 that connects the first connecting body 15 and the second connecting body 18 are configured by bolts. At least one of the shafts may be constituted by a bolt.

  Moreover, in the said embodiment, although demonstrated using the existing pile removal casing 3 of a series and long structure which has predetermined length, the existing pile removal casing 3 used is as shown in FIG. Moreover, the thing of the division structure which connected the some casing single body up and down and connected so that decomposition | disassembly was possible by the connection part 3a may be sufficient. In addition, although a configuration using a pair of left and right chuck claws 5 and 5 has been described, the number of chuck claws 5 used may be increased to three or more if the diameter of the casing 3 is increased. Furthermore, although the hydraulic cylinder 6A is used as the drive source of the chuck claw drive device 6, the drive source is not limited to the hydraulic cylinder 6A, and may be another fluid cylinder (for example, a hydraulic cylinder). .

It is a whole side view showing one embodiment of an existing pile removal device concerning the present invention. It is an expanded vertical sectional view which shows one Embodiment of an excavation part. FIG. 3 is a bottom view of FIG. 2. One Embodiment of the attachment state of a chuck | zipper claw is shown, (a) is an expanded longitudinal cross-sectional view, (b) is a rear view. One Embodiment of a chuck | zipper claw is shown, (a) is a rear view, (b) is a side view. It is an enlarged side view showing one embodiment of a top sheave device. FIG. 7 is a plan view of FIG. 6. It is an operation explanatory view showing the relation between the existing pile removal casing and the existing pile, (a) is an excavated state, (b) is a friction-removed state, (c) is a rim cutting state with the existing pile lower end, (d) is It is the chucking state of the existing pile lower end. It is operation | movement explanatory drawing of a chucking nail | claw, (a) is a standby state, (b) is the chucking state of the existing pile lower end. It is operation | movement explanatory drawing of one Embodiment in the existing pile removal construction method, (a) is the excavation completion state by the existing pile removal casing, (b) is a casing initial pulling state, (c) is a state in the middle of the casing lifting, (D) is a state where the casing is lifted and the existing pile is removed. Other embodiment of a chuck | zipper nail | claw is shown, (a) is a rear view, (b) is a side view. It is operation | movement explanatory drawing which shows the relationship between the existing pile removal casing and existing pile when the chuck nail | claw of FIG. 11 is used, (a) is an excavation state, (b) is a state in the middle of the existing pile parting, (c). Is the chucking state after the existing pile is divided. The 1st modification of a chuck nail drive device is shown, (a) is a waiting state of a chuck nail, and (b) is a chucking state of an existing pile. The 2nd modification of a chuck nail drive device is shown, (a) is a waiting state of a chuck nail, and (b) is a chucking state of an existing pile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing pile removal apparatus 2 Existing pile removal heavy machine 3 Existing pile removal casing 4 Casing drive device 5 Chuck claw drive device 6 Chuck claw 8 Top sheave device 10 Through hole 24 Vertical penetration 25 Existing pile 26 Existing pile division (Cutting) blade parts P1, P2 Two upper and lower positions of the chuck claw P3, P4 Two upper and lower inner surfaces of the through hole

Claims (8)

An existing pile removal casing in which a chuck claw is rotatably attached and a through hole through which the chuck claw enters and exits is provided in the vicinity of the lower end, and a casing driving device that attaches and detaches and rotates the existing pile removal casing. The casing drive device is attached and moved up and down, and the existing pile removal heavy machine that holds the existing pile removal casing in a vertical posture or a substantially vertical posture via the casing drive device, and the chuck claw is rotated to A chuck claw driving device for moving the chuck claw out of the through hole into the casing, and when the existing pile removing heavy machine lifts the casing driving device and the existing pile removing casing via the casing driving device. Next, the end of the existing pile is chucked and held by the chuck claw driven by the chuck claw driving device. In removal device of the existing pile of removal from Gaité ground,
When the load of the existing pile is applied to the chuck claw, the upper and lower positions of the chuck claw are configured to contact the upper and lower two inner surfaces of the through hole, and the chuck claw is connected to the chuck claw driving device. An existing pile removing device characterized in that it is detachably assembled with the pile. In the removal apparatus of the existing pile of Claim 1,
The existing pile removing device, wherein the chuck claw is curved in a rotating direction. In the removal apparatus of the existing pile of Claim 1 or Claim 2,
The chuck | zipper claw is provided with the blade part for existing pile parting, The removal apparatus of the existing pile characterized by the above-mentioned. In the removal apparatus of the existing pile of Claim 1, Claim 2, or Claim 3,
A top sheave device for raising and lowering the casing drive device is provided on the existing pile removing heavy machine, and a vertical penetrating portion that allows penetration of the existing pile removing casing is formed on the top sheave device. A device for removing existing piles. An existing pile removing heavy machine is installed in the vicinity of the existing pile, and the existing pile removing casing is attached to the casing driving device mounted on the existing pile removing heavy machine so as to be movable up and down so as to be attachable / detachable and rotatable. When the existing pile removing casing is rotated by the casing driving device and surrounding the existing pile with the existing pile removing casing, the soil around the existing pile is drilled and dug down to a predetermined depth. The chuck pawl is driven by the chuck pawl drive device, and the chuck pawl is protruded from the through hole provided near the lower end of the existing pile removal casing into the existing pile removal casing so that the underground end of the existing pile The existing pile removal heavy machine is used to lift the existing pile removal casing together with the casing drive device to remove the existing pile. In the method,
When the existing pile removal casing is lifted together with the casing drive device by the existing pile removal heavy machine, the chuck claws are brought into contact with the two upper and lower inner surfaces of the through-holes by bringing the upper and lower positions of the chuck claws into contact with each other. The load of the existing pile loaded on the chuck is distributed at two positions above and below the chuck claw, and the chuck claw is supported in a replaceable manner with respect to the chuck claw driving device. Removal method. In the removal method of the existing pile according to claim 5,
With the existing pile removal casing, the soil around the existing pile is drilled down from the deepest part of the existing pile, and the chuck claw is driven by the chuck claw driving device to hold the bottom end of the existing pile in the ground. Then, the existing pile removal method characterized by removing the existing pile at a time. In the removal method of the existing pile according to claim 5,
The soil around the existing pile is drilled to the middle of the existing pile by the existing pile removal casing, and then the chuck claw equipped with the blade for cutting the existing pile is driven by the chuck claw driving device to remove the existing pile. A method for removing an existing pile, wherein the existing pile is removed by repetition of an operation of dividing and holding the lower end portion of the existing pile above the divided portion and removing the existing pile. An existing pile removing heavy machine is installed in the vicinity of the existing pile, and the existing pile removing casing is attached to the casing driving device mounted on the existing pile removing heavy machine so as to be movable up and down so as to be attachable / detachable and rotatable. When the existing pile removing casing is rotated by the casing driving device and surrounding the existing pile with the existing pile removing casing, the soil around the existing pile is drilled and dug down to a predetermined depth. The chuck pawl is driven by the chuck pawl drive device, and the chuck pawl is protruded from the through hole provided near the lower end of the existing pile removal casing into the existing pile removal casing so that the underground end of the existing pile The existing pile removal heavy machine is used to lift the existing pile removal casing together with the casing drive device to remove the existing pile. In the method,
At least one of the step of attaching the existing pile removal casing to the casing drive device so as to be attachable / detachable and rotationally driveable, and the step of lifting the existing pile removal casing together with the casing drive device by the existing pile removal heavy machine The existing pile removal casing is penetrated through a vertical through portion formed in a top sheave device that lifts and lowers the casing drive device provided in the heavy machine for removing the existing pile. Construction method.

Images