JP2017053167A - Existing pile removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an existing pile removing device enabling a smooth opening/closing operation of a gripping piece, facilitating countermeasures at a time of failure as well as maintenance and inspection, and reducing costs by simplifying a structure.SOLUTION: An existing pile gripping mechanism 3 constituting an existing pile removal device includes: two cylinder mechanisms 6x, 6y provided at diagonal positions on an outer peripheral surface at a top end of a casing 1; two lifting/lowering rods 70x, 70y connected to a tip of a rod of each of the cylinder mechanisms 6x, 6y and hanging down to a bottom end of the casing 1; gripping pieces 2A, 2B fitted openably on an opening edge at the bottom end of the casing 1; and a gripping piece opening/closing mechanism 7 converting force to pull up and force to push down each of the lifting/lowering rods 70x, 70y into force in a closing direction and force in an opening direction of each of the gripping pieces 2A, 2B. A plurality of claw plates 4 is protruded at a tip part of each of the gripping pieces 2A, 2B, and a blade 40 is provided on a tip part of each of the claw plates 4 for excavating a ground around the existing pile and cutting the existing pile.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an existing pile removing device used for pulling up an existing pile buried in the ground and removing it when the building structure is replaced.

  For example, building structures such as buildings, condominiums, factories, etc. have concrete piles embedded in hard ground in order to support the load. When rebuilding a building structure, after dismantling and removing the old building, it is necessary to pull out the old existing pile buried deep underground. The applicant has recently proposed an existing pile removing apparatus having the configuration shown in FIG. 6 (see, for example, Patent Document 1). This existing pile removing apparatus includes a cylindrical casing 100 provided with a plurality of excavating blades 110 along an opening edge at the lower end, and the excavating blade 110 rotating the casing 100 around the central axis thereof, and the ground by the excavating blade 110. And a pair of left and right grip pieces 9A and 9B provided at a position above the excavating blade 110 inside the casing 100 so as to be capable of opening and closing.

  The grip pieces 9A and 9B are brought into contact with each other in a closed state to have a bowl shape with an upper surface opening, and are opened and closed by a grip piece opening / closing mechanism 90. The grip piece opening / closing mechanism 90 includes a semi-cylindrical lift plate 91 along the outer peripheral surface of the casing 100, a pair of operating rods 92 </ b> A and 92 </ b> B that connect the lift plate 91 and the grip pieces 9 </ b> A and 9 </ b> B, and the casing 100. A single cylinder mechanism 93 provided at the upper end of the cylinder and a single lifting rod 94 that connects the rod of the cylinder mechanism 93 and the lifting plate 91.

  In order to remove the existing pile in the ground using the existing pile removing device having the above-described configuration, the existing pile removing device is moved so that the upper end of the existing pile enters the casing 100, and then the casing 100 is moved by the casing driving mechanism 101. Is rotated about its central axis, the ground around the existing pile is excavated by the excavating blade 110 at the lower end of the casing 100, and the casing 100 is gradually lowered. When the casing 100 is lowered, the cylinder mechanism 93 pushes down the operating rods 92A and 92B via the elevating rod 94 and the elevating plate 91, whereby the gripping pieces 9A and 9B are opened. When the lower end of the casing 100 reaches slightly below the lower end of the existing pile, the driving of the casing drive mechanism 101 is stopped and excavation by the excavating blade 110 is stopped.

  Thereafter, when the cylinder mechanism 93 is driven and the operating rods 92A and 92B are pulled up integrally with the lifting rod 94 and the lifting plate 91, the gripping pieces 9A and 9B are closed. When each grip piece 9A, 9B is in a closed state, it has a bowl shape with an opening on the upper surface, and can be gripped by crawling an existing pile. Since the holding pieces 9A and 9B are kept closed by holding the lift plate 91 in the raised state, the existing piles in the casing 100 held by the holding pieces 9A and 9B by a crane (not shown) are used as the casing 100. And pull up to the ground.

  A cutting blade (not shown) for cutting an existing pile can be provided at the tip of one gripping piece 9A. In this case, the cylinder mechanism 93 is driven during excavation so that each gripping piece 9A, 9B Close operation. Thus, the existing pile is cut by the cutting blade that rotates integrally with the casing 100. By pulling up an existing pile several times while cutting it, even an existing pile that is long and heavy can be lifted from the ground and removed.

Japanese Patent No. 5265642

  However, in the existing pile removing apparatus having the above-described configuration, in order to open and close the gripping pieces 9A and 9B, the rod of the cylinder mechanism 93 is expanded and contracted to raise and lower one lifting rod 94, and the lifting rod 94 lifts and lowers the lifting plate. The lifting / lowering plate 91 is tilted when the lifting / lowering 91 is lifted or pushed down, and there is a possibility that the lifting / lowering plate 91 is lifted / lowered, and that the holding pieces 9A and 9B are opened / closed.

  In addition, since the grip pieces 9A and 9B are provided inside the casing 100, it is not easy to deal with a failure and maintenance / inspection. In particular, the grip pieces 9A and 9B have a cutting blade for cutting existing piles. If it is provided, not only will maintenance and inspection take more time, but two types of blades, a cutting blade for cutting the ground and a cutting blade for cutting existing piles, will be provided, resulting in a complicated structure and high cost. It becomes.

  The present invention has been made paying attention to the above-mentioned problem, and the opening and closing operation of the gripping piece is smooth.Furthermore, it is easy to cope with the failure and to perform maintenance and inspection, and the cost can be reduced by simplifying the structure. It aims at providing the existing pile removal device which was realized.

  An existing pile removing apparatus according to the present invention comprises a cylindrical casing having a diameter and length larger than the diameter and length of an existing pile to be removed embedded in the ground, and the casing is rotated about its central axis. A casing driving mechanism, a crane that supports the casing driving mechanism and the casing so as to be movable up and down, and a gripping mechanism for an existing pile incorporated in the casing are provided. The gripping mechanism includes two cylinder mechanisms provided with the rods facing downward at the diagonal position of the outer peripheral surface of the upper end of the casing, and is connected to the tip of the rod of each cylinder mechanism along the outer peripheral surface of the casing. Provided between two lifting rods that hang down to the lower end of the casing, a pair of gripping pieces that can be opened and closed attached to the opening edge of the lower end of the casing, and the lower end of each lifting rod and each gripping piece A grip piece opening / closing mechanism is provided for converting a force for pulling up each lifting rod into a force in a direction for closing each gripping piece and converting a force for pushing down each lifting rod into a force in a direction for opening each gripping piece. A plurality of claw plates project from the tip of each grip piece, and a blade capable of excavating the ground around the existing pile and cutting the existing pile is provided at the tip of each claw plate. ing.

  In order to remove the existing pile in the ground using the existing pile removal device having the above configuration, first, the upper end of the existing pile to be removed is slightly exposed on the ground surface, and the upper end of the existing pile enters the casing. Move the existing pile removal device. Next, the casing is rotated about its central axis by the casing drive mechanism, and the casing is gradually removed while excavating the ground around the existing pile with the blades of the plurality of claw plates provided at the tip of each gripping piece. Lower. When the casing is lowered, the rod of each cylinder mechanism protrudes and pushes down the two lifting rods all at once. As a result, the knob pieces are kept open, so that the ground is excavated by the blades of each nail plate. The When the lower end of the casing reaches a little below the lower end of the existing pile, the shaft rotation of the casing is stopped and the excavation of the ground is stopped.

  Next, the rod of each cylinder mechanism is pulled in and the two lifting rods are pulled up all at once, thereby closing each gripping piece. Since the state where the lifting rod is pulled up is maintained, each gripping piece is kept in a closed state, so that the nail plate grips the existing pile and pulls the existing pile together with the casing by the crane.

  When removing an existing pile while cutting it short, when the lower end of the casing reaches the appropriate position of the existing pile, pull the rod of each cylinder mechanism with the casing pivoted, and pull up the two lifting rods all at once. go. As a result, when each gripping piece is closed, the blade at the tip of each claw plate comes into contact with the outer peripheral surface of the existing pile and cuts the existing pile. After cutting, the shaft rotation of the casing is stopped, the existing piles that have been cut are grasped by the nail plates of the grip pieces, and the existing piles that have been cut together with the casing are pulled up by the crane.

  In a preferred embodiment of the present invention, the gripping piece opening / closing mechanism includes a rectangular driving plate connected to the lower end of each lifting rod, and gripping pieces on both side ends of each gripping piece. A rotating plate provided integrally, a support mechanism that is provided at both side positions sandwiching each of the driving plates, and that freely supports the rotating plates in both forward and reverse directions, and the driving plate and the rotating And a conversion mechanism that is provided between the plate and converts the raising / lowering operation of the drive plate into a rotation operation of the rotation plate in forward and reverse directions.

  According to this embodiment, the respective drive plates are lifted and lowered simultaneously in response to the lifting and lowering operations of the two lifting rods, and the lifting and lowering operations of the respective lifting and lowering plates are turned in the forward and reverse directions of the respective rotating plates by the conversion mechanism. Since it is converted, each gripping piece rotates integrally with each rotating plate to open and close.

  Various types of the conversion mechanism are conceivable. One embodiment of the conversion mechanism includes first and second recesses cut into semicircular shapes at upper and lower positions on both side edges of each drive plate, and First and second cylindrical projections provided corresponding to the first and second recesses along the outer peripheral portion of the inner surface of each rotating plate, and each drive plate is determined. When the first protrusion is fitted into the first recess and the second protrusion is pushed out from the second recess, each gripping piece is opened and each drive plate is determined. The second protrusion is fitted into the second recess and the first protrusion is pushed out from the first recess when the second protrusion is raised, and each grip piece is closed.

  According to this embodiment, the operation of opening the grip pieces when the drive plates are lowered all at once and the operation of closing the grip pieces when the drive plates are raised all together are the first and the second of the drive plates. This is performed by fitting one of the first and second protrusions of the rotating plate into each recess and pushing the other, and the gripping piece is fitted by fitting the corresponding protrusion into each recess. It is maintained in an open state and a closed state, and a smooth and reliable opening / closing operation of the grip piece is realized with a simple configuration.

  According to the present invention, the grip pieces are directly opened and closed by the two lifting rods, and a plurality of claw plates are provided at the tip of each grip piece attached to the opening edge at the lower end of the casing. Since the blade that has both the functions of cutting the ground and cutting the existing pile is provided at the tip of the plate, the gripping piece can be opened and closed smoothly, and it is easy to handle and maintain / inspect at the time of failure. The cost can be reduced by simplifying the above.

It is a front view which shows the whole structure of the existing pile removal apparatus which is one Example of this invention. It is a front view which shows the structure of the principal part of the existing pile removal apparatus of FIG. It is a front view which expands and shows a part of structure of the holding mechanism of the existing pile. It is sectional drawing which shows a drive plate and the guide frame which supports a drive plate freely to slide. It is a front view which shows operation | movement of a holding piece opening / closing mechanism. It is a front view which shows the continuation of operation | movement of the holding piece opening / closing mechanism of FIGS. It is a front view which shows the continuation of operation | movement of the holding piece opening / closing mechanism of FIG. It is a front view which shows the structure of the conventional existing pile removal apparatus.

  FIG. 1 shows an overall configuration of an existing pile removing apparatus according to an embodiment of the present invention, and FIG. 2 shows a configuration of a main part of the existing pile removing apparatus. This existing pile removal device is mainly used to pull out an existing pile (indicated by P in FIG. 5) buried in the ground and remove it from the ground when rebuilding a building structure. It can be used for various removal work, such as gathering and picking up buried objects other than existing piles buried in the ground, and cutting and picking up concrete boards buried in the ground .

  The existing pile removing apparatus of the illustrated example includes a cylindrical casing 1 and a casing drive mechanism 5 that rotates the casing 1 about its central axis. The casing 1 has a larger diameter than the existing pile so that the existing pile in the ground to be removed can be surrounded by the entire length of the existing pile. Moreover, the casing 1 has a length longer than that of the existing pile so that the existing pile can be inserted to the depth of the existing pile.

  A pair of gripping pieces 2A and 2B constituting the gripping mechanism 3 are attached to the opening edge of the lower end of the casing 1 so as to be openable and closable. As shown in FIG. 3, each grip piece 2 </ b> A, 2 </ b> B has a shape that curves along the opening edge at the lower end of the casing 1, and a plurality of claws along the tip edge of each grip piece 2 </ b> A, 2 </ b> B. The plates 4 are fixed at equal intervals by tightening bolts 41. Each claw plate 4 protrudes in the length direction of the casing 1 and has a blade 40 such as a cemented carbide chip or diamond at the tip. The blade 40 of each nail plate 4 has a function of excavating the ground around the existing pile buried in the ground to cut the relationship between the existing pile and the ground, and the outer peripheral surface of the existing pile buried in the ground. It also has the function of abutting and cutting existing piles.

  The casing 1 is configured using a steel pipe or the like. A plurality of openings 12 having a predetermined size are formed on the peripheral surface of the casing 1. The state of the existing pile passing through the inside of the casing 1 through these openings 12 can be observed, and air, water, and the like can be circulated inside and outside the casing 1.

  The upper end of the casing 1 is connected to a casing drive mechanism 5 that rotates the casing 1 about its central axis. The casing drive mechanism 5 has a motor (not shown) that generates a rotational force for rotating the casing 1 therein. An annular rotary drive shaft 51 that rotates by the motor projects from the lower portion of the casing drive mechanism 5, and a connecting portion 52 that is integrally provided at the lower portion of the rotary drive shaft 51 is connected to a joint portion 53 at the upper end of the casing 1. Are connected. The rotational movement of the rotary drive shaft 51 is transmitted to the casing 1 through this connecting portion, and the casing 1 and the casing drive mechanism 5 are moved up and down integrally by the crane 10 raising and lowering operation.

  Two cylinder mechanisms (hereinafter referred to as “first cylinder mechanism 6x” and “second cylinder mechanism 6y”) have rods (piston rods) 60 facing downward on the outer peripheral surface of the upper end portion of the casing 1. Each is attached to a diagonal position by a support metal fitting 64. 1 to 4, the mechanisms that move up and down using the second cylinder mechanism 6 y and the second cylinder 6 y as drive sources are not shown, but the reference numerals of these mechanisms are the same as those of the first cylinder mechanism 6 x. It is shown in parentheses together with a reference numeral of each mechanism that moves up and down as a drive source. Each cylinder mechanism 6x, 6y is a drive source of the gripping mechanism 3 for gripping an existing pile, and the gripping mechanism 3 is connected to the tip of the rod 60 and hangs down to the lower end of the casing 1 along the outer peripheral surface of the casing 1 The grip pieces 2A and 2B are opened and closed through the two lifting rods 70x and 70y and the grip piece opening and closing mechanism 7 described later. In the figure, reference numeral 72 denotes a lifting guide for freely supporting the lifting rods 70x and 70y on the outer peripheral surface of the casing 1 in the vertical direction. 73 denotes a tip of the rod 60 of the cylinder mechanisms 6x and 6y and the lifting rods 70x and 70x. It is a connector which connects the upper end part of 70y.

  Each of the cylinder mechanisms 6x and 6y is a hydraulic cylinder having the same characteristics, and two pipes 61 and 62 are connected to lead in and out the hydraulic oil into an internal cylinder chamber. When hydraulic oil is introduced from the first pipe 61, the internal piston is pressed downward, and the rod 60 protrudes downward. At this time, the hydraulic oil is led out from the second pipe 62 to the outside. Further, when hydraulic oil is introduced from the second pipe 62, the internal piston is pressed upward, and the rod 60 is retracted. At this time, the hydraulic oil is led out from the first pipe 61 to the outside. The operation oil is introduced into and introduced from the cylinder mechanisms 6x and 6y under the control of a hydraulic control circuit (not shown). The cylinder mechanisms 6x and 6y operate in synchronism, and the rods 60 of the cylinder mechanisms 6x and 6y simultaneously project and retract at the same speed.

  A crane 10 shown in FIG. 1 supports the casing 1 and the casing drive mechanism 5 so as to be lifted and lowered in a suspended state, and is integrated with the casing 1 in a state where an existing pile in the casing 1 is grasped by the grasping pieces 2A and 2B. Pull up to the ground. A hook 54 is attached to the upper part of the casing drive mechanism 5, and this hook 54 is hooked on the hook 11 attached to the crane 10. In the figure, reference numeral 13 denotes a steady plate for preventing the casing 1 from precessing while excavating the ground.

  As shown in FIG. 3, each of the grip pieces 2 </ b> A and 2 </ b> B has a curved shape that substantially circulates along the opening edge at the lower end of the casing 1, and is curved with substantially the same curvature as the casing 1. When each grip piece 2A, 2B is in an open state, as shown in FIGS. 3 and 5-1, the outer peripheral surface of the casing 1 and the outer peripheral surface of each grip piece 2A, 2B are substantially aligned and continuous. In this open state, each nail plate 4 protrudes downward. At this time, since the blades 40 of the nail plates 4 are vertically oriented, the ground is excavated as the casing 1 rotates.

  When the grip pieces 2A and 2B are closed in a state where the shaft rotation of the casing 1 is stopped, each claw plate 4 is inclined inward integrally with the grip pieces 2A and 2B, as shown in FIG. The nail plates 4 approach each other. Thereby, it is possible to grab the lower end of the existing pile P as well as the outer peripheral surface of the existing pile P. Further, when the gripping pieces 2A and 2B are shifted from the open state to the closed state with the casing 1 rotating in the axial direction, the blades 40 of the claw plates 4 tilted inward as shown in FIG. The existing pile P can be cut by contacting the existing pile P obliquely with respect to the outer peripheral surface.

  Each grip piece 2A, 2B is substantially half-circumferentially along the opening edge at the lower end of the casing 1, and both side edges of each grip piece 2A, 2B are opposed to each other at a predetermined distance as shown in FIG. ing. Rotating plates 21a and 21a are integrally joined to both side end portions of one grip 2A, and rotating plates 21b and 21b are integrally joined to both side end portions of the other gripping piece 2B from outside. The rotary plates 21a and 21b are located on both sides of the rectangular drive plates 71x and 71y connected to the lower ends of the elevating rods 70x and 70y, and are rotated in forward and reverse directions by the support mechanisms 22a and 22b. The gripping pieces 2A and 2B are tilted by being freely supported.

  The support mechanisms 22a and 22b in the illustrated example include rectangular support plates 23a and 23b attached to the lower end portion of the casing 1 by welding so as to sandwich the drive plates 71x and 71y, and the support plates 23a and 23b. The short shaft-like support shafts 24a and 24b projecting outward on the outer surface and the inner surfaces of the respective rotation plates 21a and 21b, that is, the surfaces facing the support plates 23a and 23b, are rotated around the support shafts 24a and 24b. It consists of bearing holes 25a and 25b that are supported freely. The rotary plates 21a and 21b are supported by the support shafts 24a and 24b so as to freely rotate in forward and reverse directions, whereby the grip pieces 2A and 2B are tilted to open and close.

  The drive plates 71x and 71y, the rotation plates 21a and 21b, the support mechanism 22 and the conversion mechanism 8 described later constitute a grip piece opening / closing mechanism 7 that opens and closes the grip pieces 2A and 2B. Each of the drive plates 71x and 71y has a rectangular shape that is long in the vertical direction, and moves up and down in a rectangular cutout portion 14 formed at a diagonal position of the opening edge at the lower end of the casing 1. As shown in FIG. 4, a U-shaped guide frame 15 that supports both side edges of the drive plates 71x and 71y in the up and down direction is attached to each notch portion 14, respectively. The drive plates 71x and 71y and the guide frame 15 may be curved in accordance with the curvature of the casing 1 (indicated by a one-dot chain line in FIG. 4).

  The gripping piece opening / closing mechanism 7 is provided between the lower ends of the lifting rods 70x and 70y and the gripping pieces 2A and 2B, and a force for pulling up the lifting rods 70x and 70y is provided in the direction of closing the gripping pieces 2A and 2B. Conversion mechanism for converting the force into a force to push down the lifting rods 70x and 70y into a force in the direction of opening the gripping pieces 2A and 2B, and performing the operations shown in FIGS. 8 is provided.

The conversion mechanism 8 is provided between one drive plate 71x and one rotation plate 21a, 21b, and between the other drive plate 71y on the opposite side and the other rotation plate 21a, 21b. The vertical movement of the drive plates 71x and 71y is converted into the rotation of the rotary plates 21a and 21b in the forward and reverse directions.
The conversion mechanism 8 in the illustrated example includes first and second recesses 81a and 81b and second recesses 82a and 82b that are cut out in a semicircular shape at a predetermined distance from the upper and lower positions of both side edges of the drive plates 71x and 71y, respectively. The first and second protrusions are formed in a cylindrical shape projecting from the inner surfaces of the rotating plates 21a and 21b at a predetermined angle corresponding to the first and second recesses 81a, 81b, 82a and 82b. Parts 83a, 83b, 84a, 84b. The diameters of the protrusions 83a, 83b, 84a, and 84b are substantially the same as the inner diameters of the recesses 81a, 81b, 82a, and 82b, and the two fit together.

  The operation of each of the first and second cylinder mechanisms 6x and 6y is controlled so that each drive plate 71x and 71y descends to the position shown in FIG. 5-1, and rises to the position shown in FIG. 5-3. Has been. One of the first and second protrusions 83a, 83b, 84a, 84b is fitted to the first and second recesses 81a, 81b, 82a, 82b according to the raising / lowering operation of the drive plates 71x, 71y. The rotating plates 21a and 21b are rotated in forward and reverse directions by being jammed and pushed out by the other.

  FIG. 5A shows that the rods 60 of the first and second cylinder mechanisms 6x and 6y protrude, the lifting rods 70x and 70y are pushed down all at once, and the drive plates 71x and 71y are lowered to the same predetermined positions. Indicates the state. In this state, the first protrusions 83a and 83b of the rotating plates 21a and 21b are completely fitted in the first recesses 81a and 81b of the drive plates 71x and 71y, respectively, while the second protrusions 83a and 83b are pushed out from the second recesses 82a and 82b, and at this time, the gripping pieces 2A and 2B are opened.

  FIG. 5-3 shows that the rods 60 of the first and second cylinder mechanisms 6x and 6y are retracted and the elevating rods 70x and 70y are pulled up all at once, and the drive plates 71x and 71y are moved up to the same position. Shows the state. In this state, the second protrusions 84a and 84b of the rotating plates 21a and 21b are completely fitted in the second recesses 82a and 82b of the drive plates 71x and 71y, respectively, while the first protrusions 83a and 83b are pushed out from the first recesses 81a and 81b. At this time, the grip pieces 2A and 2B are closed.

  FIG. 5B shows a state in which the rods 60 of the first and second cylinder mechanisms 6x and 6y protrude halfway and the drive plates 71x and 71y are at the same intermediate position. In this state, the first protrusions 83a and 83b of the rotating plates 21a and 21b are provided in the first recesses 81a and 81b of the drive plates 71x and 71y, and the second protrusion 83a is provided in the second recesses 82a and 82b. 83b are fitted in a slightly floating state, and each gripping piece 2A, 2B is in a semi-closed state.

  Note that the conversion mechanism 8 of this embodiment includes the first and second recesses 81a, 81b, 82a, 82b and the rotary plates 21a, 71b sandwiching the drive plates 71x, 71y on both side edges of the drive plates 71x, 71y. The first and second protrusions 83a, 83b, 84a, 84b are respectively formed on 21b, and the reciprocating linear motion of the drive plates 71x, 71y is changed to the rotational motion of the rotating plates 21a, 21b in the forward and reverse directions. The conversion mechanism 8 is not limited to the one shown in this embodiment. For example, the drive mechanism 71x and 71y have racks on both side edges and the rotation plates 21a and 21b mesh with the racks. The thing of the structure which provided this may be sufficient.

  In order to remove the existing pile in the ground using the existing pile removing device having the above-described configuration, first, the upper end of the existing pile P to be removed is slightly exposed to the ground surface, and the upper end of the existing pile P enters the casing 1. So that the existing pile removal device is moved. Next, the casing 1 is rotated about its central axis by the casing drive mechanism 5, and the ground around the existing pile P is formed by the blades 40 of the plurality of nail plates 4 provided at the tip portions of the gripping pieces 2 </ b> A and 2 </ b> B. The casing 1 is gradually lowered while digging. FIG. 5A shows a state of the grip pieces 2A and 2B when the casing 1 is lowered.

  When the casing 1 is lowered, the rods 60 of the first and second cylinder mechanisms 6x and 6y protrude to push down the two lifting rods 70x and 70y at the same time. The first protrusions 83a and 83b of the rotary plates 21a and 21b are completely fitted in the recesses 81a and 81b (see FIG. 5A). Thereby, each knob piece 2A, 2B integral with the rotating plates 21a, 21b is kept open, and the blade 40 of each claw plate 4 excavates the ground. In the above operation, the two cylinder mechanisms 6x and 6y are operated in synchronism, individually depressing the elevating rods 70x and 70y simultaneously, and directly transmitting the depressing forces to the elevating plates 71x and 71y. Since the opening operation of 2A and 2B is performed, the opening operation of the grip pieces 2A and 2B is performed smoothly and stably. When the lower end of the casing 1 reaches a position slightly below the lower end of the existing pile P, the driving of the casing drive mechanism 5 is stopped, the shaft rotation of the casing 1 is stopped, and the excavation of the ground is stopped.

  Next, each of the first and second cylinder mechanisms 6x and 6y pulls the rod 60 and pulls up the two lifting rods 70x and 70y all at once. As a result, the first protrusions 83a and 83b of the rotary plates 21a and 21b are pushed out from the first concave portions 81a and 81b of the drive plates 71x and 71y, respectively, while the rotary plates are inserted into the second concave portions 82a and 82b. The second protrusions 84a and 84b of 21a and 21b are completely fitted (see FIG. 5-3). The rotary plates 21a and 21b rotate with the above operation, and the gripping pieces 2A and 2B are closed together with the rotary plates 21a and 21b.

In the above operation, the two cylinder mechanisms 6x and 6y are operated in synchronism, and the lifting rods 70x and 70y are individually lifted simultaneously, and the lifting force is directly transmitted to the lifting plates 71x and 71y, respectively. Since the 2A and 2B are closed, the gripping pieces 2A and 2B are closed smoothly and stably. By holding the lifting rods 70x and 70y in the raised state, the gripping pieces 2A and 2B are held in a closed state, and are gripped by the nail plate 4 so as to crawl the existing pile P. 1 and the existing pile P can be pulled up.
When the casing 1 is pulled up, if an excessive load of the existing pile P is applied to the grip pieces 2A, 2B, the grip pieces 2A, 2B are opened by releasing the pulling force of the lifting rods 70x, 70y. The pile P can be easily released. Accordingly, there is no possibility that the grip pieces 2A and 2B are broken by an excessive load.

  When removing the existing pile P while cutting it short, the rods of the first and second cylinder mechanisms 6x, 6y are rotated with the casing 1 pivoted when the lower end of the casing 1 reaches the appropriate position of the existing pile P. 60 is pulled in and the two lifting rods 70x and 70y are pulled up simultaneously. Thereby, when each gripping piece 2A, 2B is closed, the blade 40 at the tip of each claw plate 4 comes into contact with the outer peripheral surface of the existing pile P (see FIG. 5-2), and the lifting rods 70x, 70y The existing pile P is cut by continuously pulling up. After cutting, the driving of the casing drive mechanism 5 is stopped to stop the shaft rotation of the casing 1, the existing piles that have been cut are gripped by the claw plates 4 of the grip pieces 2 A and 2 B, and the existing piles that are cut along with the casing 1 by the crane 10. Pull up.

  According to the configuration of the existing pile removing device described above, the grip pieces 2A and 2B are directly opened and closed by the two lifting rods 70x and 70y connected to the first and second cylinder mechanisms 6x and 6y. The opening / closing operation of 2A and 2B is performed smoothly. Further, the grip pieces 2A and 2B are attached to the opening edge of the lower end of the casing 1, and a plurality of claws having a blade 40 having both functions of cutting the ground and cutting existing piles at the tip of each grip piece 2A and 2B. Since the plate 4 is provided, a gripping piece is provided inside the casing, and a blade for excavating the ground and a blade for cutting an existing pile are separately provided on the lower end of the casing and the gripping piece; In comparison, it is easy to deal with failure, maintenance, and inspection, and the cost can be reduced by simplifying the structure.

DESCRIPTION OF SYMBOLS 1 Casing 2A, 2B Grasp piece 3 Grasp mechanism 4 Claw plate 5 Casing drive mechanism 6x, 6y Cylinder mechanism 7 Grasp piece opening / closing mechanism 8 Conversion mechanism 21a, 21b Rotating plate 22a, 22b Support mechanism 40 Blade 60 Rod 70x, 70y Lifting rod 71x, 71y Drive plate 81a, 81b 1st recessed part 82a, 82b 2nd recessed part 83a, 83b 1st protrusion 84a, 84b 2nd protrusion

In order to remove the existing pile in the ground using the existing pile removal device having the above configuration, first, the upper end of the existing pile to be removed is slightly exposed on the ground surface, and the upper end of the existing pile enters the casing. Move the existing pile removal device. Next, the casing is rotated about its central axis by the casing drive mechanism, and the casing is gradually removed while excavating the ground around the existing pile with the blades of the plurality of claw plates provided at the tip of each gripping piece. Lower. When the casing is lowered, the rod of each cylinder mechanism protrudes and pushes down the two lifting rods at the same time. As a result, the gripping piece is kept open, so that the ground is excavated by the blades of each nail plate. The When the lower end of the casing reaches a little below the lower end of the existing pile, the shaft rotation of the casing is stopped and the excavation of the ground is stopped.

Further, in the existing pile removing device of the present invention, the grip piece opening / closing mechanism is provided at a rectangular drive plate connected to a lower end portion of each lifting rod, and at both end portions of each grip piece. A rotating plate provided integrally with the gripping piece, a support mechanism provided at both side positions sandwiching each of the driving plates, and supporting the rotating plates so as to freely rotate in forward and reverse directions, and the driving plate; And a conversion mechanism that is provided between the rotating plate and converts the raising / lowering operation of the driving plate into a rotating operation of the rotating plate in forward and reverse directions.

According to this configuration , the drive plates move up and down all at once in response to the up and down movements of the two up and down rods, and the up and down movements of the up and down plates are converted into forward and reverse rotational movements of the rotary plates by the conversion mechanism. Therefore, each gripping piece rotates integrally with each rotating plate to open and close.

Claims (3)

  A cylindrical casing having a diameter and length larger than the diameter and length of an existing pile to be removed embedded in the ground, a casing driving mechanism for rotating the casing around its central axis, and the casing driving mechanism And an existing pile removing device comprising a crane that supports the casing so as to be movable up and down, and an existing pile holding mechanism incorporated in the casing, wherein the holding mechanism is a rod at a diagonal position on the outer peripheral surface of the upper end portion of the casing. Two cylinder mechanisms provided facing downward, two lifting rods that are connected to the tip of the rod of each cylinder mechanism and hang down to the lower end of the casing along the outer peripheral surface of the casing, and the lower end of the casing A pair of gripping pieces that are attached to the opening edge so as to be openable and closable, and each lifting piece provided between the lower end of each lifting rod and each gripping piece A gripping piece opening / closing mechanism that converts a force for pulling up the rod into a force in the direction of closing each gripping piece and a force for pushing down each lifting rod into a force in the opening direction of each gripping piece. Removal of existing piles with a plurality of nail plates projecting at the tip, and a blade capable of excavating the ground around the existing pile and cutting the existing pile at the tip of each nail plate apparatus.   The grip piece opening / closing mechanism includes a rectangular drive plate connected to a lower end portion of each lifting rod, a rotating plate provided integrally with the grip pieces on both side ends of each grip piece, A support mechanism provided between the drive plate and the rotary plate, and a support mechanism that is provided at both sides of the drive plate and supports the rotary plates to freely rotate in forward and reverse directions. The existing pile removing device according to claim 1, further comprising: a conversion mechanism that converts the lifting / lowering operation into a rotating operation of the rotating plate in forward and reverse directions.   The conversion mechanism includes first and second recesses cut into semicircular shapes at the upper and lower positions of both side edges of the drive plates, and first and second outer peripheral portions of the inner surfaces of the rotary plates. First and second cylindrical projections provided corresponding to the second recesses, and the first projections are formed in the first recesses when each drive plate is lowered to a predetermined position. When the part is fitted and the second protrusion is pushed out from the second recess, each gripping piece is opened and each drive plate is raised to a predetermined position. The existing pile removing device according to claim 2, wherein the gripping piece is fitted and the first protrusion is pushed out from the first recess to close each gripping piece.

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