JP5138983B2 - Existing pile removal device and removal method - Google Patents

Description

  The present invention relates to a removal device and a removal method for removing existing concrete piles buried in the ground in urban redevelopment and bridge replacement.

  Generally, as a means for removing existing piles, a cylindrical casing is built so as to surround the existing piles to protect the surrounding ground, and a chisel suspended by a crane is placed inside the casing. A method is widely used in which an existing pile is crushed from the upper end side and dropped, and the operation of discharging the crushed material to the ground with a hammer grab is repeated. However, with such removal means, the large vibration and noise generated by the impact of the chisel fall are problematic, and the chisel and hammer grab need to be replaced frequently, resulting in poor work efficiency and placement in the pile. In many cases, it was difficult to pull up the reinforcing bars that were entangled with the chisel or hammer grab.

Therefore, in recent years, various methods have been proposed in which existing piles are cut into short pieces without being crushed and carried to the ground. In these proposed methods, a cylindrical casing is built in the ground so as to surround the existing pile, but the cutting blade provided on the lower inner peripheral side of the casing is displaced inward, and the existing casing is rotated by rotating the casing. Cut into the outer periphery of the pile to cut the internal vertical reinforcing bars (Patent Documents 1 and 2), or by fixing the one end side to the lower inner wall surface of the casing and extending horizontally along the inner wall surface, An existing pile is cut short while rotating the casing (Patent Document 3), and a part of the existing pile cut short is pulled up to the ground together with the casing to be taken out.
JP 2002-138474 A JP 2006-16778 A JP 2006-97275 A

  However, as in Patent Documents 1 to 3, in the method in which the cut part of the existing pile is lifted to the ground together with the casing and removed, the hole after the cut is buried by the collapse of the peripheral wall by the extraction of the casing built around the existing pile. In addition, there is a concern that the ground around the remaining existing piles may become unstable, and it is necessary to redo the casing's rotary press-fitting in the next cutting operation, which wastes power consumption and causes poor work efficiency. . Furthermore, in the method of cutting only the outer peripheral part with the vertical reinforcing bar of the existing pile as in the methods of Patent Documents 1 and 2, the uncut core part of the existing pile is torn sideways after the cutting, and therefore the existing pile It requires special operating means to apply a large breaking force. On the other hand, in the method using a wire saw as in Patent Document 3, in addition to the time taken for cutting, there is a high possibility that the wire saw will be crushed or torn by pressure and become uncut, and the reliability is inferior. there were.

  In view of the above-mentioned situation, the present invention can be easily removed by cutting the existing pile under the ground with a functional and simple device configuration as a means for removing the existing pile under the ground, and is very high. An object of the present invention is to provide a removal apparatus and a removal method that can obtain a work efficiency and that require less equipment and construction costs.

If the means for achieving the above object is shown with reference numerals in the attached drawings, the existing pile removing apparatus according to claim 1 of the present invention is a cylindrical shape that surrounds the existing pile P and is built in the ground. A casing 1, a rotary press-fitting means 2 that presses and digs into the buried ground of the existing pile P while rotating the cylindrical casing 1, a pile cutting and unloading device 3 that is arranged to be raised and lowered in the cylindrical casing 1, The pile cutting / unloading device 3 includes lifting / lowering means for moving up and down, and rotation transmission means (gripper 4) for transmitting the rotational force of the cylindrical casing 1 to the pile cutting / unloading device 3. The excavation holding cylinder 31 that is dug into the t between the inner circumference of the cylindrical casing 1 and the outer circumference of the existing pile P with rotation due to rotation, and a movable cutting pivotally attached to the lower part of the excavation holding cylinder 31 The blades 5 and 5 and the movable cutting blades 5 and 5 in a non-cutting posture in a downward direction Comprising a Luo tip of the cutting edge (cutting bit 5b) is a cutting blade rotating means for rotating forced inwardly to the cutting completion position is reached substantially at the center O of the existing pile P (hydraulic cylinders 6, 6), the The cutting blade rotation means 6, 6 are arranged on the upper outside side of the digging holding cylinder 31, and the cutting rotation means 6, 6 are arranged along the inner peripheral surface of the digging holding cylinder 31. Of the existing pile P, which is pivotally connected to the movable cutting blades 5 and 5 on the lower side of the digging holding cylinder 31 via the vertical belt-like levers 36 and 36 extending downward, and surrounded by the cylindrical casing 1 The upper part of the existing pile P is cut off by fitting the digging holding cylinder 31 to the upper part and rotating the movable cutting blades 5 and 5 from the non-cutting posture to the cutting completion posture with rotation by the rotation transmitting means. The cut portion P1 of the existing pile P is moved to the movable cutting blades 5 and 5 in the cutting completion posture. The bottom is received and held in the digging holding cylinder 31, and is lifted together with the pile cutting and unloading device 3 by lifting means to be carried out to the ground.

  The invention of claim 2 is the apparatus for removing an existing pile according to claim 1, wherein the movable cutting blade 5 has a plurality of parts along the lower edge of the semicircular arc shaped plate body 5a pivotally attached to the digging holding cylinder 31 at both ends. A pair of movable cutting blades 5 is provided on both radial sides of the digging holding cylinder 31 in a non-cutting posture and is configured to mesh with each other in a cutting posture.

  According to a third aspect of the present invention, in the apparatus for removing an existing pile according to the first or second aspect, the movable cutting blade 5 has a cutting edge (cutting bit 5b) protruding below the lower end of the digging holding cylinder 31 in a non-cutting posture. The structure is

According to a fourth aspect of the present invention, in the existing pile removing apparatus according to any one of the first to third aspects, the cutting blade rotating means is composed of the hydraulic cylinder 6, and the pile cutting and unloading device 3 is a suspension that forms a swivel joint. An internal hydraulic line L1 to the hydraulic cylinder 6 is connected to the rotation side member 7a of the swivel joint, and an external external hydraulic line L2 is connected to the non-rotation side member 7b. The hydraulic lines L1 and L2 inside and outside the machine communicate with each other at the sliding contact interface between the rotation side member 7a and the non-rotation side member 7b, and have a non-rotation side member 7b anti-rotation means (anti-rotation pipe 8). The structure is

  According to a fifth aspect of the present invention, in the existing pile removing apparatus according to any one of the first to fourth aspects, the rotation transmitting means is provided on the pile cutting / unloading apparatus 3 side, and is provided with a plurality of presses equally distributed in the circumferential direction. The pile cutting and unloading device 3 is composed of a plurality of grippers 4 with respect to the device main body 3a in which the excavation holding tube 31 is integrated. There is provided a lifting tool 7 linked so as to be vertically displaceable via a single pressing member 40, and the pressing member 40 is retracted radially inward by the extension of the link in the suspended state of the pile cutting and unloading device 3. It is set as the structure which changes to a separated position and the pressing position which protrudes to a radial direction outer side by the link contraction accompanying the weight 7 of the lifting tool 7 and the said pressing member 40 in the non-suspended state.

  The method for removing an existing pile according to the invention of claim 6 is the pile according to claim 1, wherein the cylindrical casing 1 is rotationally press-fitted into the ground where the existing pile P is buried to surround at least the upper portion of the existing pile P. The cutting and unloading device 3 is inserted into the cylindrical casing 1 from above, and the rotational force of the cylindrical casing 1 that is press-fitted and digging is transmitted to the pile cutting and unloading device 3, and the excavation holding cylinder 31 is tubed by the transmitted rotational force. The movable cutting blades 5 and 5 are turned inward when the predetermined length on the upper side of the existing pile P is accommodated in the excavation holding cylinder 31 by digging into the t between the inner periphery of the cylindrical casing 1 and the outer periphery of the existing pile P. , The existing pile P is cut from the outer peripheral side to the center, and the cut portion P1 of the existing pile P is bottomed by the movable cutting blades 5 and 5 in the cutting completion posture, and the excavation holding cylinder 31 is cut. The pile cutting and unloading device 3 is lifted in the state where it is held inside and the transmission of rotational force is stopped. After the cut portion is carried out to the ground, the pile cutting and unloading device 3 is inserted into the cylindrical casing 1 again. Similarly, the pile cutting and unloading cylinder 31 is inserted into the cylinder and the movable cutting blades 5 and 5 are turned inward. The upper side of the pile P is cut out and held in the digging holding cylinder 31, and the operation of raising the pile cutting and unloading device 3 and carrying out the cut portion P1 to the ground is repeated.

  If the effect by this invention is shown by attaching | subjecting the referential mark of drawing, in the removal apparatus of Claim 1, and the removal method of Claim 6, it will cut | disconnect the existing pile P in the ground shortly without crushing, and this cut part P1 Can be carried to the ground by raising the pile cutting and unloading device 3, and it is not necessary to pull up the cylindrical casing 1 surrounding the existing pile P at the time of carrying out the hole. There is no fear that the peripheral wall will be buried or the ground around the remaining existing pile will be unstable, and there is no need to repeat the rotary press-fitting of the cylindrical casing 1 at the same position for each cut. In addition, the excavation holding cylinder 31 of the pile cutting and unloading device 3 is not required by using the rotational force of the cylindrical casing 1 that is press-fitted and digging without the need for soil removal from t between the tubular casing 1 and the existing pile P. The entire existing pile P can be cut only by digging into the space t and turning the movable cutting blades 5 and 5 of the pile cutting and unloading device 3 inward, so that a very high work efficiency can be obtained. At the same time, there is no waste of power consumption and less equipment and construction costs.

  According to the second aspect of the invention, the existing pile P can be efficiently cut so as to bite with the pair of movable cutting blades 5 and 5, and the semicircular plate body 5a of each movable cutting blade 5 is dug at both ends. Since it is pivotally attached to the holding cylinder 31, high operation reliability and durability can be obtained.

  According to the invention of claim 3, since the movable cutting blade 5 protrudes downward from the lower end of the digging holding cylinder 31 in a non-cutting posture, the digging holding cylinder 31 of the pile cutting and unloading device 3 is a cylindrical casing. When digging t between 1 and the existing pile P, the movable cutting blade 5 leads and digs, and the digging efficiency of the digging holding cylinder 31 is improved accordingly.

  According to the invention of claim 4, the movable cutting blade 5 can be reliably rotated and displaced by the hydraulic cylinder 6, and the rotation-side in-machine hydraulic line L <b> 1 that supplies and discharges pressure oil to and from the hydraulic cylinder 6 is not connected. An external hydraulic pipe is connected to the rotation-side external hydraulic line L2 through a suspension 7 constituting a swivel joint, and the non-rotation-side member 7b is prevented from rotating by a non-rotating means. The malfunction of the movable cutting blade 5 due to the entanglement or twisting of the path L2 is reliably avoided.

  According to the fifth aspect of the present invention, the plurality of pressing members 40 of the gripper 4 provided on the pile cutting and unloading device 3 side press against the inner peripheral surface of the cylindrical casing 1, and the cylindrical shape is rotationally driven. The pile cutting and unloading device 3 is integrated with the casing 1, so that the excavation holding cylinder 31 and the existing pile P can be reliably cut by the rotational force of the cylindrical casing 1, and the cylinder of the pressing member 40 of the gripper 4. Since the separation / separation operation with respect to the inner periphery of the cylindrical casing 1 is automatically and rationally performed without power by the change of the weight load depending on the suspended state and the unsuspended state of the pile cutting and unloading device 3, the construction and equipment costs are increased accordingly. Is reduced.

  Hereinafter, an embodiment of an existing pile removing apparatus according to the present invention will be specifically described with reference to the drawings. 1 is a vertical cross section of two directions different from each other by 90 degrees of a pile cutting and unloading device used in the removing device, FIGS. 2 to 5 are transverse cross sections at positions V to Y in FIG. 1, and FIGS. FIG. 8 is a lifting tool of the pile cutting / unloading device, FIG. 9 is a movable cutting blade of the pile cutting / unloading device, and FIGS. 10 and 11 are the removal device. Each of the existing pile removal processes is shown.

  As shown in FIGS. 1 to 5, the pile cutting and unloading device 3 of the removing device includes a base frame 30 in which a substantially rhombic mounting plate 30 b is fixed to the upper end of a small-diameter vertical cylindrical portion 30 a, and a top plate at the lower end. The large-diameter cylindrical digging holding cylinder 31 to which the portion 31a is fixed and the guide cylinder 32 standing on the mounting plate 30b constitute an integrated apparatus main body 3a. The gripper 4 and the suspension tool 7 are provided via the cylinder 32, and a pair of hydraulic cylinders 6 and 6 are suspended from the lower surfaces of both ends of the mounting plate 30b. Further, T-shaped brackets 33, 33 are fixedly provided at both radial positions on the lower inner surface side of the digging holding cylinder 31, and the brackets 33, 33 are respectively attached to the lower edge of the semicircular arc plate 5a. A pair of movable cutting blades 5 and 5 to which a plurality of cutting bits 5b... Are fixed are pivotally attached to each other through pivot pins 34 so as to be rotatable in a vertical plane.

  Both hydraulic cylinders 6, 6 constitute cutting blade rotation means, and the ends of the telescopic rods 6 a, 6 a projecting downward are openings 31 b provided in the top plate portion 31 a of the digging holding cylinder 31, Through 31b, it is pivotally attached to both sides in the radial direction of the lever mounting tube 35 disposed on the lower side of the top plate portion 31a, and both the radial sides of the lever mounting tube 35 and the movable cutting blades 5, 5 The central portion of the upper edge is pivotally connected to each other via a lever 36 in the form of a vertical strip. The connecting portions at the upper and lower ends of each lever 36 are hinges 36a. Then, as shown in the left half of FIG. 1 (A), both movable cutting blades 5 and 5 are in a downward non-cutting posture at the retracted positions of the telescopic rods 6a and 6a of both hydraulic cylinders 6 and 6, As shown in the right half view of FIG. 1 (A), the cutting bit 5b... Is set to a cutting completion posture in which the tip of the cutting bit 5b. ing. Further, at the lower end edge of the digging holding cylinder 31, digging bits 37 are projected downward at regular intervals in the circumferential direction. Both movable cutting blades 5 and 5 are set so that the cutting bits 5b project downward from the excavation bits 37 of the excavation holding cylinder 31 in the downward non-cutting posture.

  In FIG. 1A, P indicated by an imaginary line is an existing pile to be removed by the present removal apparatus, and 1 is a cylindrical casing used for the present removal apparatus. 1 will be concentrically fitted. As illustrated, the digging holding cylinder 31 of the pile cutting and unloading device 3 has an outer diameter smaller than the inner diameter of the cylindrical casing 1 and an inner diameter larger than the outer diameter of the existing pile P. And both movable cutting blades 5 and 5 are accommodated in the annular space between the existing pile P and the cylindrical casing 1 to be fitted thereto, together with the levers 36 and 36 in the downward non-cutting posture. .

  As shown in FIGS. 6 and 7, the gripper 4 includes three pressing members 40 equally arranged in the circumferential direction, and these pressing members 40 are simultaneously displaced in the radial direction by the separation / contact displacement mechanism 4a. It has become. That is, in the separation / contact displacement mechanism 4a, the upper bracket portion 41a of the elevating member 41 in which the lower shaft portion 41b is inserted into the guide cylinder 32 so as to be movable up and down, and each pressing member 40 via the upper link piece 42a. 7 and the vertical mounting plates 43 equally distributed at three locations on the outer peripheral side of the guide cylinder 32 and the pressing members 40 are linked through intermediate and lower link pieces 42b and 42c. As shown in the left half of the figure, when the lifting member 41 is in the lowered position, the respective pressing members 40 project radially outward due to the link contraction, and in the raised position of the lifting member 41 as shown in the right half of the figure, each pressing member 40 is radiused by the extension of the link. Retreat inside.

  Each pressing member 40 of the gripper 4 has a convex arcuate curved surface with a curvature corresponding to the inner peripheral surface of the cylindrical casing 1 at the outer surface portion 40a. The elevating member 41 is pivotally connected to the lower end of the rotating side member 7b of the lifting tool 7 via a pivot pin 44 at a central position on the upper surface of the upper bracket portion 41a as a part of the lifting tool 7. It is urged in the downward direction by a compression coil spring 45 fitted between the lower end flange portion 41 c of the side shaft portion 41 b and the inner upper end portion of the guide cylinder 32. And in the state which loaded the pile cutting | discharging carrying-out apparatus 3 in the cylindrical casing 1 like FIG.6 and FIG.7, when the weight of the lifting tool 7 including the raising / lowering member 41 and the pressing member 40 is added to the apparatus main body 3a, The outer surface portion 40a of each pressing member 40 is pressed in close contact with the inner peripheral surface of the cylindrical casing 1 by link contraction accompanying the lowering of the elevating member 41, while the pile cutting and unloading device 3 is suspended by a crane (not shown) or the like. When suspended via the holding device 7, the respective pressing members 40 are separated from the inner peripheral surface of the cylindrical casing 1 by the link extension accompanying the ascent of the elevating member 41.

  As shown in FIGS. 8 (A) and 8 (B), the lifting tool 7 is fitted to a rotation side member 7a having a round shaft shape on the center side, and the outer side thereof via upper and lower bearings 70, 70 so as to be relatively rotatable. The combined cylindrical non-rotating side member 7b constitutes a swivel joint, and two in-machine hydraulic lines L1 for supplying and discharging pressure oil to and from the hydraulic cylinders 6 and 6 are formed below the rotating side member 7a. One end of L1 is connected, and two external hydraulic lines L2 and L2 from the outside are connected to the non-rotating side member 7b, and each one of the internal hydraulic line L1 and the external hydraulic line L2 is connected. They are connected to each other at the sliding contact interfaces of both members 7a and 7b via internal oil passages 71a and 71b. The other end of the in-machine hydraulic pipes L1 and L1 is connected to the hydraulic cylinders 6 and 6 through a piping block 38 (see FIGS. 1 and 3) fixed on the top plate portion 31a of the digging holding cylinder 31. doing. Reference numeral 72 denotes an annular retaining end plate screwed to the upper and lower end surfaces of the non-rotating member 7b, and reference numeral 73 denotes a seal ring interposed at the sliding contact interface at the upper and lower positions of the communicating portions of the internal oil passages 71a and 71b.

  Further, connecting protrusions 75 and 75 having locking holes 74 are integrally formed at the upper and lower ends of the rotation side member 7a, and the blade pieces 76 and 76 projecting radially outward on the non-rotation side member 7b. Are formed, and each blade piece 76 has a round shaft-like locking projection 77 on the top surface on the tip side. Then, as shown in FIG. 8A, the non-rotating side member 7b is fitted with the non-rotating pipes 8 to the locking projections 77 and 77, and the upper side of these pipes 8 is appropriately positioned at the ground position. By preventing the rotation, the rotation with the rotation side member 7a is prevented.

In order to remove the existing pile P by the removing device having the above-described configuration, first, as shown in FIG. 10 (A) , the cylindrical casing 1 is inserted into the underground G in which the existing pile P is buried by the rotary press-fitting means 2. By rotating and press-fitting, at least the upper side of the existing pile P is concentrically surrounded by the cylindrical casing 1. The rotary press-fitting means 2 uses a rotary press-fitting device used in a general all-casing method, and forms a long cylindrical casing 1 by sequentially adding short cylindrical bodies. In order to perform efficiently, it is recommended to use the lowest short cylindrical body having the excavation bits 1a at the periphery of the lower end. Thus, after the cylindrical casing 1 is rotationally press-fitted to a predetermined depth, the rotation is stopped, and the earth and sand above the top end of the existing pile P in the cylindrical casing 1 is discharged to the ground with a hammer grab or the like. Then, as shown in FIG. 10B, the pile cutting and unloading device 3 suspended by a crane (not shown) or the like is inserted into the cylindrical casing 1 from above, and the existing pile P and the cylindrical casing 1 It is placed on the earth and sand at t. In this mounting state, as described above, the lifting member 41 is lowered by the weight load of the lifting tool 7 and the pressing member 40 including the lifting member 41, and each pressing member 40 of the gripper 4 is moved to the cylindrical casing. Since it presses against the inner peripheral surface of 1, the pile cutting and unloading device 3 also rotates together with the rotation of the cylindrical casing 1.

Therefore, by next restarting the rotational press-fitting of the cylindrical casing 1, as shown in FIG. 10C , the excavation holding cylinder 31 of the pile cutting and unloading device 3 that rotates integrally is provided with the existing pile P and the cylindrical casing. The digging is inserted into the earth and sand layer t between 1 and 1, and accordingly, the upper side of the existing pile P enters the digging holding cylinder 31. At this time, the telescopic rods 6a and 6a of both hydraulic cylinders 6 and 6 are in the retracted position, and both the movable cutting blades 5 and 5 are in the downward non-cutting posture. Leads the digging of the digging holding cylinder 31 as a digging bit. Further, the non-rotating pipes 8 and 8 engaged with the lifting tool 7 are held horizontally and immovable by the detent frame 9 provided on the rotary press-fitting means 2. When the height becomes insufficient due to the descending, the rotation is sequentially added to reach the detent frame 9.

Then, when the upper side of the existing pile P entering the digging holding cylinder 31 reaches a predetermined length, both the hydraulic cylinders 6 and 6 are operated to extend while the rotary press-fitting of the cylindrical casing 1 is continued . As shown in FIG. 10 (D) , both movable cutting blades 5 and 5 gradually inwardly turn into the existing pile P from the outer peripheral surface side, and finally both movable as shown in FIG. 11 (E). The cutting blades 5 and 5 mesh with each other at the center O to completely cut the existing pile P.

After this cutting, the rotary press-fitting of the cylindrical casing 1 is stopped, and the pile cutting / unloading device 3 is lifted, so that each pressing member 40 of the gripper 4 is moved to the cylindrical casing 1 as shown in FIG. At the same time as the entire pile cutting and unloading device 3 is lifted, the cut portion P1 of the existing pile P is also bottomed by the movable cutting blades 5 and 5 in the cutting completion posture, It can be lifted while staying in 31. Accordingly, as shown in FIG. 11 (G) , after the pile cutting / unloading device 3 is unloaded to the ground, both movable cutting blades 5 and 5 are returned to the original non-cutting posture at an appropriate side position, and the excavation holding cylinder The cut portion P <b> 1 may be discharged from 31. In the lifting operation of the pile cutting and unloading device 3, the anti-rotation pipes 8 and the anti-rotation frame 9 that have been engaged with the lifting tool 7 are removed in advance.

Thus, when the first cut of the existing pile P is completed, as shown in FIG. 11 (H) , the pile cutting and unloading device 3 suspended by a crane or the like is inserted into the cylindrical casing 1 again, and the remaining existing pile P In the state where each pressing member 40 of the gripper 4 is pressed against the inner peripheral surface of the cylindrical casing 1, the cylindrical casing 1 is rotationally press-fitted, so that the digging holding cylinder 31 is provided. The pile P and the cylindrical casing 1 are digged into the earth and sand layer t, and the upper side of the existing pile P is cut in the same manner as the previous time, and the cut portion P1 is placed in the digging holding cylinder 31. Put it on the ground. Thereafter, the same operation is repeated and finally the entire existing pile P may be removed from the underground G.

  According to such a removal method, since the existing pile P of the underground G can be cut short and removed, generation of large vibration and noise as in the case of crushing and removing is prevented, and the cut portion P1 is What is necessary is just to carry out to the ground with the pile cutting and unloading device 3, and since it is not necessary to pull up the cylindrical casing 1 surrounding the existing pile P for the carrying out, the hole after cutting is buried by the collapse of the peripheral wall, or the remaining existing There is no concern that the ground around the pile P will become unstable, and there is no need to redo the press-fitting of the cylindrical casing 1 at the same depth position for each cut. In addition, the excavation holding cylinder 31 of the pile cutting and unloading device 3 is not required by using the rotational force of the cylindrical casing 1 that is press-fitted and digging without the need for soil removal from t between the tubular casing 1 and the existing pile P. The entire existing pile P can be cut only by digging into the space t and turning the movable cutting blades 5 and 5 of the pile cutting and unloading device 3 inward, so that a very high work efficiency can be obtained. At the same time, there is no waste of power consumption and equipment and construction costs are very low.

  Further, the existing pile P can be efficiently cut so as to bite with the pair of movable cutting blades 5, 5, and the semi-arc plate 5 a of each movable cutting blade 5 is pivotally attached to the digging holding cylinder 31 at both ends. Therefore, high operational reliability and durability can be obtained. Furthermore, in this embodiment, the movable cutting blade 5 protrudes downward from the lower end of the digging holding cylinder 31 in a non-cutting posture, and is movable cut with respect to the digging of the digging holding cylinder 31 of the pile cutting and unloading device 3. Since the blade 5 leads and digs, the digging efficiency of the digging holding cylinder 31 is improved accordingly. Then, the rotational displacement of the movable cutting blade 5 can be reliably performed by the hydraulic cylinder 6, and the in-machine hydraulic line L <b> 1 on the rotating side and the non-rotating side out-of-machine hydraulic pipe supplying and discharging pressure oil to and from the hydraulic cylinder 6 The movable cutting blade 5 due to the entanglement or twisting of the external hydraulic line L2 is connected to the path L2 through the suspension 7 constituting the swivel joint and also prevents the non-rotating side member 7b from rotating around. The malfunction of is reliably avoided. In addition, in the configuration of the embodiment, the separation / contact operation of the pressing member 40 of the gripper 4 with respect to the inner periphery of the cylindrical casing 1 is not caused by a change in weight load due to the suspended state and the unsuspended state of the pile cutting / unloading device 3. There is also an advantage that it is automatically and rationally performed by power, and the construction and equipment costs are reduced accordingly.

  In the existing pile removing apparatus of the present invention, various methods other than the exemplified gripper 4 can be adopted as the rotation transmitting means for transmitting the rotational force of the cylindrical casing 1 to the pile cutting / unloading apparatus 3, and the gripper 4 The pressing member 40 may be operated by hydraulic pressure or pneumatic pressure. Moreover, in the said embodiment, although the movable cutting blade 5 protrudes below the lower end of the digging holding cylinder 31 in the non-cutting posture, the cutting edge of the movable cutting blade 5 in the non-cutting posture is conversely the digging holding tube. It may be higher than the lower end of 31 or may be at substantially the same depth position. Furthermore, the rotation preventing means for preventing the rotation of the non-rotating side member 7b of the lifting tool 7 is not limited to the combination of the illustrated rotation stop pipes 8 and the rotation stop frame 9, and various methods can be adopted. In addition, in the present invention, the detailed configuration such as the configuration of the movable cutting blade 5, the shape and arrangement configuration of the cutting bit 5 a and the excavation bit 37, and the connection structure from the telescopic rod 6 a of the hydraulic cylinder 6 to the movable cutting blade 5 are implemented. Various design changes can be made in addition to the form.

The pile cutting and carrying-out apparatus used for the removal apparatus of the existing pile which concerns on one Embodiment of this invention is shown, (A) is a vertical front view which shows a left-right half part in a different operation state, (B) is a vertical side view. It is a cross-sectional arrow view in the V position of FIG. It is a cross-sectional arrow view in the W position of FIG. It is a cross-sectional arrow view in the X position of FIG. It is a cross-sectional arrow view in the Y position of FIG. It is a cross-sectional view of a gripper portion during construction of the pile cutting and unloading device. It is a vertical front view which shows the same gripper part in a left and right half part in a different operation | movement state. The hanging tool of the same pile cutting and unloading device is shown, (A) is a longitudinal side view, (B) is a plan view. The movable cutting blade of the pile cutting and unloading apparatus is shown, (A) is a plan view, (B) is a longitudinal side view, and (C) is a front view. It is a schematic vertical side view which shows the removal work of the existing pile by the removal apparatus in order of the process of (A)-(D). It is a schematic vertical side view which shows the removal work of the existing pile by the removal apparatus in order of the process of (E)-(H).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical casing 2 Rotation press-in means 3 Pile cutting | disconnection carrying-out apparatus 3a Apparatus main body 31 Digging holding cylinder 4 Gripper (rotation transmission means)
40 pressing member 5 movable cutting blade 5a semicircular arc plate 5b cutting bit 6 hydraulic cylinder (cutting blade rotating means)
7 Suspension 7a Rotating side member 7b Non-rotating side member 8 Non-rotating pipe (non-rotating means)
O Center P Existing pile P1 Cut part t Between cylindrical casing inner periphery and existing pile outer periphery

Claims (6)

A cylindrical casing that surrounds the existing pile and is built in the ground, a rotary press-fitting means that allows the cylindrical casing to be pushed into the buried land of the pile while rotating, and is arranged to be movable up and down in the cylindrical casing The pile cutting and unloading device, the lifting and lowering means for raising and lowering the pile cutting and unloading device, and the rotation transmitting means for transmitting the rotational force of the cylindrical casing to the pile cutting and unloading device,
The pile cutting and unloading device is rotatable to a lower part of the digging holding cylinder and a digging holding cylinder that is digged between the inner periphery of the cylindrical casing and the outer periphery of the existing pile with rotation by the rotation transmitting means. A pivotable movable cutting blade, and a cutting blade rotating means for forcibly rotating the movable cutting blade inward from a downward non-cutting posture to a cutting completion posture where the tip of the tip reaches the approximate center of the existing pile. Comprising
The cutting blade rotating means is disposed on the upper outer side of the digging holding cylinder, and the cutting rotation means includes a vertical belt-like lever extending downward along the inner peripheral surface of the digging holding cylinder. Is pivotally connected to the movable cutting blade on the lower side of the engraving holding cylinder via
Then, the excavation holding cylinder is fitted over the existing pile surrounded by the cylindrical casing, and the movable cutting blade is rotated from the non-cutting posture to the cutting completion posture with rotation by the rotation transmitting means. The upper portion of the existing pile is cut off, and the cut portion of the existing pile is supported by a movable cutting blade in a cutting completion posture and is held in a digging holding cylinder, and the pile cutting and unloading device is moved by the lifting means The existing pile removing device is configured to be lifted together and carried to the ground.   The movable cutting blade is provided with a plurality of cutting bits along the lower edge of the semicircular arc plate whose both ends are pivotally attached to the engraving holding cylinder, and a pair of the movable cutting blades is in a non-cutting posture. The existing pile removing device according to claim 1, wherein the pile removing device is arranged on both sides in the radial direction of the digging holding cylinder and configured to mesh with each other in a cutting posture.   3. The existing pile removing apparatus according to claim 1, wherein the movable cutting blade has a cutting edge protruding downward from a lower end of the digging holding cylinder in the non-cutting posture. The cutting blade rotating means is composed of a hydraulic cylinder, and the pile cutting and unloading device has a suspension that forms a swivel joint, and an in-machine hydraulic line to the hydraulic cylinder is connected to a rotation side member of the swivel joint The external hydraulic line from the outside is connected to the non-rotating side member, and the internal and external hydraulic lines are connected in communication at the sliding contact interface between the rotating side member and the non-rotating side member. The existing pile removing apparatus according to any one of claims 1 to 3, further comprising a member detent means. The rotation transmission means is provided on the pile cutting and unloading device side, and includes a gripper that displaces and displaces a plurality of pressing members equally distributed in the circumferential direction with respect to the inner peripheral surface of the cylindrical casing,
The pile cutting and unloading device comprises a lifting tool linked to the device main body integrated with the digging holding cylinder so as to be vertically displaceable via a plurality of pressing members of the gripper,
By the separation position where the pressing member retracts radially inward by the extension of the link in the suspended state of the pile cutting and unloading device, and the link contraction due to the lifting tool in the non-suspended state and the weight load of the pressing member apparatus for removing existing pile according to any one of claims 1-4 which is converted to the press-contact position where the overhanging radially outwardly.   A cylindrical casing is rotationally press-fitted into the ground where the existing piles are buried to surround at least the upper portion of the existing piles, and the pile cutting and unloading device according to claim 1 is inserted into the cylindrical casing from above and press-fitted and advanced. The rotational force of the cylindrical casing is transmitted to the pile cutting and unloading device, and the excavation holding cylinder is digged and inserted between the inner periphery of the cylindrical casing and the outer periphery of the existing pile by the transmitted rotational force, and the inside of the excavation holding cylinder When the predetermined length on the upper side of the existing pile is settled in, the movable cutting blade is turned inward to cut the existing pile from the outer periphery to the center and cut the cut portion of the existing pile. After receiving the bottom with a movable cutting blade and holding it in the digging holding cylinder, raising the pile cutting and unloading device in a state where the transmission of the rotational force is stopped and carrying the cut portion to the ground, the pile cutting and unloading Insert the device again into the cylindrical casing, In the same way, cut the existing pile upper side by digging insertion of the digging holding cylinder and inward rotation of the movable cutting blade, hold it in the digging holding cylinder, raise the pile cutting and unloading device and bring the cut part to the ground A method for removing an existing pile characterized by repeating the operation of carrying out.

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