JP3457575B2 - Underground pile removal equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground buried pile pulling-out device for pulling out piles buried in foundation ground, mainly PC (precast concrete) piles.

[0002]

2. Description of the Related Art For example, when rebuilding a building structure, after dismantling and removing an old building, new prefabricated piles (PC piles) required for a new building are driven into the site. At this time, if the position of the pile to be newly driven overlaps with the old underground buried pile, it is necessary to pull out the old underground buried pile.

Conventionally, when pulling out unnecessary piles buried in the ground as described above, while excavating the periphery of the buried piles by a rotary casing that is driven to rotate by an auger machine that moves up and down along the leader, After digging up to near the tip of the pile, the wire was tied to the upper end of the underground pile and the pile was pulled out by a crane.

[0004]

In the conventional method as described above, it is necessary to pull up the casing after digging with the casing and bind the wire to the upper end portion of the buried pile so as not to come off. In addition to the time and effort required, the wires are tied up at the top of the buried piles so that they can be pulled up, so when pulling up, old piles often break in the middle and remain in the ground. The lifting of the piles was also very troublesome.

In view of the above problems, it is an object of the present invention to provide a device for pulling out underground buried piles capable of reliably pulling up unnecessary piles buried underground in a short time.

[0006]

According to a first aspect of the present invention, there is provided a device for pulling out underground piles, which is buried in the ground by a drilling blade 26 at a tip end of an auger machine 2 which moves up and down along a leader 1. A casing 3 for excavating the periphery of the pile P to cut the edge between the pile P and the ground is rotatably connected, and a plurality of locking claws 4 for gripping the pile P are provided at a lower portion of the casing 3.
Can be switched between a locking position where each locking claw 4 projects from the casing 3 side and locks on the outer peripheral surface of the pile P by the claw switching operation means 5 and a retracted position where the locking claw 4 retracts from this locking position to the casing 3 side. arranged and, as pulled by the upward movement of the auger machine 2 the pile P which cut the edge of the ground by drilling by the casing 3 is grasped by a plurality of locking claws 4, the circumferential direction in the lower portion of the casing 3 At intervals
A peripheral frame 17 is provided to penetrate the casing 3 in and out.
The locking claw 4 is pivotally mounted in the peripheral frame by a pivot 18.
The locking claw 4 has its tip end with the pivot 18 as a fulcrum.
The portion 4a rotates in the peripheral frame 17 from the upper side to the lower side to rotate the peripheral frame 17
The locking position where it projects outside and locks on the outer peripheral surface of the pile P.
From the locking position of the
It will rotate over the retracted position that retracts into the peripheral frame 17.
And wherein it is in the jar.

[0007]

According to a second aspect of the present invention, in the apparatus for pulling out underground piles according to the first aspect, the pawl switching operation means 5 has a plurality of connecting rods 20 extending in the longitudinal direction of the casing 3 at circumferential intervals. The slide bars 13 are slidably supported in the longitudinal direction, and the lower ends of the connecting rods 20 are interlockingly connected to the locking claws 4 via the crank mechanism 22, while the slide sleeve 13 is provided on the upper end side of the casing 3. The ring member 14 and the auger machine 2 which are integrally rotatable with each other and are slidably fitted in the longitudinal direction thereof, the upper ends of the respective connecting rods 20 are connected to the slide sleeve 13, and the ring member 14 which is rotatably fitted to the slide sleeve 13. Between the cylinders 16
The cylinder 16 is extended and contracted so that each locking claw 4 is switched between the locking position and the retracted position via the ring member 14, the slide sleeve 13, the connecting rod 20 and the crank mechanism 22. It is characterized by being

According to a third aspect of the present invention, in the apparatus for extracting an underground pile according to the first or second aspect , a fluid jet pipe 27 for jetting water, cement milk or air from the lower end of the casing 3 is provided in the casing 3. It is characterized by

[0010] Claim 4 is the pull-out device of buried pile according to any one of claims 1 to 3, the casing 3 is characterized by comprising a screw 3a on the outer circumference.

[0011]

1 is an overall side view showing a drawing device according to the present invention, FIGS. 2 and 3 are enlarged side views and an enlarged front view of an upper side of the drawing device, and FIG. 4 is a lower end portion of the drawing device. A side sectional view and a front view are shown. As is generally understood from FIG. 1, this pulling-out device includes a pile P buried in the ground below the auger machine 2 that moves up and down along the leader 1.
A casing 3 for excavating the periphery of the pile P and cutting the edge between the pile P and the ground is rotatably connected, and a plurality of locking claws 4 for gripping the pile P are provided at the lower part of the casing 3. By the switching operation means 5, each locking claw 4 is arranged to be switchable between a locking position where the locking claw 4 projects from the casing 3 side and locks on the outer peripheral surface of the pile P and a retracted position where the locking claw 4 retracts from the locking position to the casing 3 side. It will be done.

The leader 1 is held in a vertical position on a crawler type vehicle 6 via a catch hawk 7 and a back stay 8. The auger machine 2 is supported by a guide rail 1a of the leader 1 so as to be able to move up and down, and is suspended by a suspension wire 10 hung on a top sheave 9 on the top of the leader 1, and the wire 10 is used as a vehicle 6 By operating the winch on the side, the reel 1 can be raised and lowered along the leader 1. A screw 3 a is formed on the outer circumference of the casing 3.

As shown in FIGS. 2 and 3, a connecting shaft 12 is coaxially and integrally connected to a rotary drive shaft 11 projecting from the lower part of the auger machine 2, and a casing connecting cylinder is continuously provided below the connecting shaft 12. The upper end of the casing 3 is integrally rotatably connected to the portion 28. A slide sleeve 13 is fitted to the connecting shaft 12 so as to be rotatable integrally with the connecting shaft 12 and slidable in the axial direction for a required stroke, and the ring member 14 is fixed to the slide sleeve 13 so that the ring member 14 cannot move in the axial direction. Mating is possible.

Then, the ring member 14 and the auger machine 2
A pair of hydraulic cylinders 16, 16 on both sides are interposed between the lower fixed frame 15 and the fixed cylinders 15.
The ring member 14 moves the slide sleeve 13 up and down by a predetermined stroke α by the expansion and contraction operation of 6. The ring member 14 has a guide 14a as shown in FIG.
It is supported and guided by the guide rail 1a of the reader 1 via.

As shown in FIG. 4, three locking claws 4 for gripping the pile P are arranged at the lower end of the casing 3 with the screw 3a at intervals of 120 degrees in the circumferential direction. As shown in FIG. 5, each of the locking claws 4 is engaged in a rectangular peripheral frame 17 penetrating the casing 3 such that the tip 4a of the claw 4 is locked to the outer peripheral surface of the pile P. It is pivotally attached by a pivot 18 so as to be rotatable between a stop position and a retracted position retracted from the locked position into the peripheral frame 17.
Is horizontally attached to the peripheral frame 17. Also, each locking claw 4
As shown in FIG. 5 (A), the tip portion 4a of the is formed in a concave shape corresponding to the convex surface of the outer peripheral surface of the pile P, and as shown in FIG. The lower side of the tip portion 4a is formed in a rounded shape so as to easily bite into the surface. A pair of arms 19 and 19 that form a bell crank together with the locking claws 4 are integrally provided on the pivoting end side of each locking claw 4 so as to project.

On the other hand, on the outer surface of the casing 3, three connecting rods 20, 20, 20 extending in the longitudinal direction of the casing 3 and the three engaging claws 4, 4, 4 are arranged at intervals of 120 degrees in the circumferential direction. They are slidably supported at corresponding positions. As shown in FIGS. 2 and 3, the upper end portion of each connecting rod 20 is connected to a bracket 21 protruding from the outer surface portion of the slide sleeve 13. In addition, in FIG. 2 and FIG.
9 indicates a joint portion of the connecting rod 20. Also, each rod 20
As shown in FIGS. 4 and 5, the lower end of the crank mechanism 2
It is interlockingly connected to the locking claw 4 via 2. The crank mechanism 22 has a pair of arms 19 and 19 projectingly provided on the side of the pivoting end of the locking claw 4, and a pin between the tips of both arms 19 and 19 and the lower end of the connecting rod 20. and a link 23 pivotally connected by a and b.

Upper and lower end portions and an intermediate portion of each connecting rod 20 are inserted and supported by a guide sleeve 24 fixed to the outer surface of the casing 3, and a screw 3a is formed as shown in FIG. 4B. Where it is, it is inserted and supported in a hole 25 penetrating the screw 3a.

The locking claws 4 are locked by the claw switching operation means 5 so that the locking claws 4 project from the casing 3 side and are locked to the outer peripheral surface of the pile P. The claw switching operation means 5 can be appropriately switched to a retracted position retracted to the side, and the slide switching operation means 5 is slidably fitted to a connecting shaft 12 connected to the rotary drive shaft 11 of the auger machine 2. A sleeve 13, a ring member 14 that is rotatably fitted to the slide sleeve 13, a hydraulic cylinder 16 that moves the ring member 14 up and down by a predetermined stroke α, and an upper end portion is connected to the slide sleeve 13 and a lower end portion. Is the crank mechanism 22
It is constituted by three connecting rods 20 connected to each locking claw 4 via.

Therefore, in this claw switching operation means 5,
When the hydraulic cylinder 16 is extended by a predetermined stroke α from the contracted position shown by the solid line in FIG.
The slide sleeve 13 slides downwards via the levers to move the connecting rods 20 downward, and by the downward movement of the connecting rods 20, the locking claws 4 are switched from the retracted position to the locking position via the crank mechanism 22 and the pile P To be in a grippable state. When the hydraulic cylinder 16 is contracted from the extended position, the slide sleeve 13 slides upward to move each connecting rod 20 upward, and the locking claw 4 is retracted from the locked position via the crank mechanism 22. Switch to.

An excavating blade 26 is provided at the lower end of the casing 3 so as to project therefrom. Further, a plurality of, for example, two fluid ejection pipes 27 for ejecting water, cement milk or air from the lower end portion thereof are arranged in the casing. Each of the fluid ejection pipes 27 is piped so as to extend in the longitudinal direction on the outer surface of the casing 3, a lower end portion 27 a thereof is projected into the casing 3, and an upper end portion thereof is piped so as to pass through the inside of the connecting shaft 12. Although not shown, the fluid supply unit is connected via a swivel mechanism.

Next, with reference to other drawings, with reference to FIG. 6, a description will be given of the construction for extracting the underground buried pile P by using the extraction device having the above-mentioned structure.

First, as shown in FIG. 1, from a state where the casing 3 is suspended so as to be positioned concentrically with the underground buried pile P, the suspension supporting wire 10 is fed out and the casing 3 is lowered, while the auger machine is being operated. 2 to drive the rotary drive shaft 11 to rotate the casing 3, and as shown in FIG.
Excavate the soil around the pile P with the excavating blade 27 at the tip,
Gradually cut the edge between the pile P and the ground. At this time, the locking claw 4 of the casing 3 is retracted to the retracted position.

As shown in FIG. 6, by excavating to the vicinity of the tip of the underground buried pile P, the edge between the pile P and the ground is almost cut. Then, in this state, after the feeding of the suspension wire 10 and the rotational driving of the casing 3 are stopped, the claw switching operation means 5 is operated to switch the locking claws 4 from the retracted position to the locked position all at once. As shown in FIG. 4A, the lower end required portion of the pile P is gripped by the three locking claws 4, 4, 4. In this locking position, each locking claw 4 is shown by a solid line in FIG. 4 (B) and also in FIG. 5 (B).
Is rotated to a horizontal position as indicated by a phantom line, and the claw tip portion 4a slightly bites into the outer peripheral surface of the pile P,
The pile P can be reliably gripped.

In this manner, while the lower end of the pile P is gripped by the three locking claws 4, 4, 4 and the suspension wire 10 is wound by a winch, the auger machine 2 is operated.
To move up along the leader 1, and the auger machine 2
The pile P is pulled out as shown in FIG. During the extraction of the pile P, the casing 3 is rotated in the direction opposite to the direction of the excavation, whereby the excavated earth and sand can be effectively backfilled in the excavation hole.

During the pulling out of the pile P as described above,
By ejecting the cement milk having a low concentration from the fluid ejection pipe 27, the earth and sand filled in the hole can be made to have the same hardness as the ground before excavation.

When the ground is relatively hard, if the casing 3 is used to excavate the ground, water or, if necessary, pressurized air is ejected from the fluid ejection pipe 27 to facilitate the excavation of the ground. You can

As described above, when the pulling device according to the present invention is used, the periphery of the underground buried pile P can be excavated by the rotation of the casing 3 to cut the edge between the pile P and the ground, and The lower end portion side of the pile P can be automatically gripped by the plurality of locking claws 4 by switching the locking claw 4 from the retracted position to the locking position by the switching operation means 5, and thus the auger machine 2 The pile P can be pulled out quickly and easily in a short time by the ascending movement of. Further, since the lower end side of the pile P is gripped by the plurality of locking claws 4 and the pull-out is not performed, the old pile P is unlikely to be cut off during the pull-out, and any pile P can be reliably pulled up to the ground. You can

In this embodiment, each locking claw 4 rotates between a locking position where the tip of the locking claw 4 locks the outer peripheral surface of the pile P and a retracted position where the locking claw 4 retracts from the locking position to the casing side. Since the locking claws 4 are pivotally attached to the casing 3 as much as possible, the locking claws 4 can be positioned substantially parallel to the casing 3 in the retracted position. It is not damaged by the ground or excavated soil, and the mounting structure of the locking claws 4 on the casing 3 is extremely simple, which facilitates the mounting work. Also, with such a mounting structure of the locking claw 4,
According to the claw switching operation means 5 having the above-described configuration shown in this embodiment, the plurality of locking claws 4 can be reliably operated simultaneously, and the retracted position and the locked position can be accurately switched. be able to.

In this embodiment, the auger machine 2 is driven up and down by the winding and unwinding operation of the suspension wire 10. However, the auger machine 2 is a chain drive by a chain arranged along the leader 1. It can be moved up and down by means of other means or other suitable lifting drive means.

In this embodiment, three locking claws 4 are used to grip the underground buried pile P, but if the pile P can be reliably gripped, the locking claws are used. The number is not limited to three and may be two. Further, the claw switching operation means 5 is
A configuration other than that shown in this embodiment may be used. For example, each locking claw has a pivot structure as in the embodiment, and the cylinder is interlockingly connected to the pivot end portion side,
It may be possible to switch between the retracted position and the locked position.
Yes.

[0031]

According to the extraction device of the invention of claim 1, the casing can excavate the periphery of the underground buried pile to cut the edge between the pile and the ground, and can be locked by the pawl switching operation means. By switching the claws between the retracted position and the locking position, the lower end side of the pile can be automatically gripped by the plurality of locking claws, so the pile can be swiftly and surely moved by raising the auger machine. It can be pulled out, and the work of pulling underground piles can be performed efficiently. In addition, since the lower ends of the piles are grasped by the plurality of locking claws and pulled out, the old piles are unlikely to be cut off during the pulling out, and any pile can be reliably pulled up to the ground.

Further , according to the present invention , each locking claw can be rotated between a locking position where the tip end is locked to the outer peripheral surface of the pile and a retracted position where the tip is retracted to the casing side. Since the locking claws are pivotally attached to the casing as described above, the locking claws can be positioned substantially parallel to the casing at the retracted position. It will not be damaged due to the above, and the attachment structure of the locking claw to the casing will be simple, and the attachment work will be easy.

According to the second aspect of the present invention , it is possible to surely operate the plurality of locking claws at the same time and to accurately switch between the retracted position and the locked position.

According to claim 3 , in the casing,
If a fluid ejection pipe for ejecting water, cement milk or air from its lower end is installed, by ejecting, for example, thin cement milk from the fluid ejection pipe while pulling out the pile, the earth and sand backfilled in the borehole can be removed. It can be as hard as the ground before excavation. When the ground is relatively hard, the ground can be easily excavated by ejecting water or pressure air from the fluid ejection pipe when excavating the ground with the casing.

If the casing having the screw on the outer circumference is used as described in claim 4 , the ground can be effectively excavated.

[Brief description of drawings]

FIG. 1 is an overall side view showing a drawing device according to the present invention.

FIG. 2 is an enlarged side view of the upper side of the drawing device.

FIG. 3 is an enlarged front view of the upper side of the drawing device.

FIG. 4A is a sectional view taken along line XX of FIG. 4B, and FIG. 4B is a front view of the lower end side of the drawing device.

5A is a sectional view taken along line YY of FIG. 5B, and FIG. 5B is a partially enlarged sectional view of FIG. 4B.

6A to 6C are process drawings for explaining the pulling-out construction of the pile by the pulling-out device.

[Explanation of symbols]

P underground pile 1 leader 2 auger machine 3 casing 4 locking claws 5 Claw switching operation means 13 Slide sleeve 14 Ring member 16 hydraulic cylinder 20 consecutive rods 22 Crank mechanism 27 Fluid ejection pipe

Claims (4)

(57) [Claims] 1. A casing for cutting an edge between a pile and the ground by excavating the periphery of a pile buried in the ground by an excavating blade at a tip end of an auger machine that moves up and down along a leader. In the lower part of the casing, a plurality of locking claws for gripping the pile are provided, and a locking position where each locking claw projects from the casing side and is locked to the pile outer peripheral surface by the claw switching operation means. It is arranged so that it can be switched from the locking position to the withdrawal position that retracts to the casing side, and the pile cut off from the ground by excavation by the casing is gripped by a plurality of locking claws to move the auger machine upwardly. It is a device for extracting underground piles that can be pulled out.
The circumferential frame at the bottom of the casing with a space in the circumferential direction.
Is provided to penetrate the casing in and out, and
The locking claw is pivotally attached by a pivot, and the locking claw is
With the fulcrum as the fulcrum, the tip turns from the top to the bottom in the peripheral frame.
Locking that moves and projects outside the peripheral frame and locks on the outer peripheral surface of the pile
Position and its locking position, the tip turns from the bottom to the top.
It moves and rotates to the retracted position where it retracts into the peripheral frame.
A device for pulling out underground piles that are growing. 2. The pawl switching operation means causes a casing to support a plurality of connecting rods extending in the longitudinal direction slidably in the longitudinal direction at intervals in the circumferential direction, and a lower end portion of each connecting rod is a crank mechanism. While interlockingly connected to each locking claw via a slide sleeve, a slide sleeve is integrally rotatable with the casing and slidably fitted in the longitudinal direction of the upper end of the casing, and the upper end of each connecting rod is connected to the slide sleeve. Then, a plurality of cylinders are provided between the ring member and the auger machine, which are rotatably fitted to the slide sleeve, and the expansion and contraction operation of the cylinders causes the ring member, the slide sleeve, the connecting rod, and the crank mechanism to intervene. The device for withdrawing a buried pile according to claim 1, wherein each locking claw is switched between a locking position and a retracted position. 3. The underground buried pile withdrawing apparatus according to claim 1, wherein the casing is provided with a fluid ejection pipe for ejecting water, cement milk or air from the lower end thereof. 4. The device for withdrawing an underground buried pile according to claim 1, wherein the casing has a screw on the outer circumference.