JPH0676689B2 - Method and device for removing existing piles - Google Patents

Description

The present invention relates to an existing pile removing method and apparatus for removing an existing pile that is buried in the ground and is no longer needed.

<Prior Art> As is well known, a large number of piles are formed in the ground for the purpose of constituting a foundation of a building or for ground improvement.

However, when dismantling an old building and constructing a new one in its place, or when newly improving the ground, it is often necessary to remove the old existing piles as an obstacle.

In general, new buildings are larger than old ones, and it is customary to make them taller.Therefore, old existing piles cannot support new buildings sufficiently, and even if old piles are used, Even if it is used as it is as a support pile for a new building, strength deterioration occurs due to the passage of concrete and reinforcing bars for a long time, and it has little utility value,
It is a danger.

<Problems to be Solved by the Invention> Conventionally, a relatively small-scale existing pile can be removed by excavating or pulling out the periphery of the existing pile with a civil engineering machine.
In reality, large-scale existing piles cannot be removed, or extremely large-scale civil engineering machines are used to gradually remove them over a long period of time.

If the old existing piles cannot be removed by any means, new piles will be installed in places avoiding these piles, and the design of the entire building must be changed, resulting in a very economical loss.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and a casing is inserted into the peripheral portion of an existing pile that is buried in the ground by a tubing device, and the inside of the casing is A pile removing device having a bucket rotatable on the outside and a chuck mechanism that can be fixed to the existing pile is attached to the upper portion of the existing pile, and the high-pressure water jet in the lateral direction of the first jet water jet mechanism provided in the bucket. Nozzle and second on the peripheral wall of the bucket
With the jet water jetted from the inward high-pressure water jet nozzle of the jet water jet mechanism, the existing pile is almost ruptured in the radial direction at the substantially lower edge position of the bucket, and the chuck mechanism is provided above the broken portion of the existing pile with the chuck mechanism. The casing and the bucket are fixed, and the casing is swung by the tubing device and the reaction force is received by the existing pile to cut the upper part from the broken part and raise the pile removal device to raise the existing structure. The present invention provides a method for removing an existing pile, which is characterized in that a broken portion of the pile is removed, and an apparatus for removing an existing pile for carrying out the above-mentioned removal method.

<Examples> Hereinafter, the present invention will be described in detail based on Examples of the drawings. An existing pile removing apparatus 1 according to the present invention is roughly a disk-shaped upper surface portion 2 and an outer peripheral edge of the upper surface portion 2. A bottomed open bucket 4 consisting of a cylindrical peripheral wall 3 hanging downward from the
The bucket 4 is provided with a chuck mechanism 5 so that it can be fixed to the existing pile a.

According to the embodiment shown in FIGS. 3 and 4, the above-mentioned chuck mechanism 5 includes a first chuck mechanism 5a capable of fixedly fixing the existing pile a to the inner surface side of the peripheral wall portion 3 of the bucket 4, Existing pile a
And a second chuck mechanism 5b that integrally fastens the bucket 6 and the bucket 4 that are inserted into the peripheral portion of the bucket.

The first chuck mechanism 5a described above is, as shown in FIG. 4, a first chuck mechanism 5a that is arranged in a facing manner at 90-degree intervals that divide the circumference into four.
The pressing member 7a is provided by a cylinder mechanism (not shown) operated by hydraulic pressure or the like so as to be fixed to the outer peripheral surface of the existing pile a, and the first pressing member 7a can be housed in the peripheral wall portion 3. .

The second chuck mechanism 5b is provided in the casing 6, and the second pressing member 7b is in phase with the first chuck mechanism 5a.
Is provided. The second pressing member 7b is normally housed in the casing 6, and is protruded inward by the operation of a cylinder mechanism (not shown) so that the inner surface is brought into pressure contact with the outer peripheral surface of the bucket 4 and the bucket 4 and the casing 6. Can be integrated.

5 and 6 show another embodiment of the chuck mechanism 5. In this embodiment, the pressing member 7 is provided on the casing 6 via the cylinder mechanism 8. The cylinder mechanism 8 can be expanded and contracted by hydraulic pressure or the like as in the above embodiment, and in the contracted state, the pressing member 7 is housed flush with the inner surface of the casing 6. Further, in this embodiment, a through hole 9 is formed in the peripheral wall portion 3 of the bucket 4 so that the pressing member 7 can be pressed against the outer peripheral surface of the existing pile a. Therefore, it is necessary to align the pressing member 7 and the through hole 9,
Since the structure of the chuck mechanism 5 is simplified, there is an advantage that it can be manufactured at low cost.

7 and 8 show another embodiment. In this embodiment, the chuck mechanism 5 is provided on the bucket 4. The cylinder mechanism 8 in this embodiment is bidirectionally extendable and retractable, and has pressing members 7c and 7d at both ends. Therefore, the inner surface of the pressing member 7c protruding inward is pressed against the outer peripheral surface of the existing pile a, and the outer surface of the outer pressing member 7d is pressed against the inner surface of the casing 6, so that the existing pile a and the casing 6 are integrally formed. And

9 and 10 show still another embodiment. In this embodiment, a supporting shaft portion 10 is provided on the bucket 4, and an arcuate operating rod 11 is pivotally mounted on the supporting shaft portion 10 so as to be rotatable. And the opposite operating rod
The cylinder mechanism 8 is provided between the free ends 11 and 11. The operating rod 11 and the cylinder mechanism 8 are moved up and down 2
For example, the cylinder mechanism 8a is configured so as to reduce the diameter of one of the upper operating rods 11a and the other lower operating rod 11b.
The cylinder mechanism 8b is configured so as to expand the diameter. Therefore,
When each cylinder mechanism 8a, 8b is activated, the upper operating rod 11
Since the existing pile a is fixed by the pressing member 7a of a and the casing 6 is fixed by the pressing member 7b of the lower operating rod 11b, the casing 6, the bucket 4, and the existing pile a can be integrated. .

In addition, it is preferable to form fine irregularities for slip prevention on the inner surface of each pressing member 7.

In addition, in the above-described removing device 1, a swivel joint 12 is provided at the center of the upper surface portion 2 of the bucket 4, and the swivel joint 12 has a first jet water jetting mechanism facing downward.
Provide 13. This first jet water injection mechanism 13 is a packer
At the lower end of a high-pressure water pipe 15 that is hung vertically via 14 a downward high-pressure water jet nozzle 16 and a horizontal high-pressure water jet nozzle 17
And are provided. In addition, a second jet water having a high-pressure water flow passage 18 passing in the longitudinal direction on the peripheral wall portion 3 of the bucket 4, and a downward high-pressure water injection nozzle 19 and an inward high-pressure water injection nozzle 20 at the lower end of the high-pressure water flow passage 18. The injection mechanism 21 is provided, and the first
Inward high-pressure water injection nozzle 17 of the jet water injection mechanism 13
The high-pressure water jetted from the head is directed toward the center of the bucket 4, and the high-pressure water jet nozzle 17 of the first jet water jet mechanism 13 and the high-pressure water jet nozzle 20 of the second jet water jet mechanism 21 have the same height. Located in.

On the other hand, a high-pressure water flow passage 22 is formed in the casing 6 as well, and a third jet water injection mechanism 24 capable of jetting jet water downward from a high-pressure water injection nozzle 23 provided at the lower end of the high-pressure water flow passage 22 is provided. Set up.

The embodiment of the concrete configuration of the removing device 1 in the present invention is as described above, and the following method is used to remove old unnecessary existing piles a buried in the ground by using the removing device 1. by.

That is, first, the casing 6 is pushed into the peripheral portion of the existing pile a by the tubing device 25. An outline of the tubing device 25 is shown in FIG.
And a jack portion 28 for supporting the chuck portion 27 so as to be movable up and down.
And a swinging portion 29 for swinging the jack portion 28. The casing 6 is fixed to the chuck portion 27 of the tubing device 25, and the casing 6 is pushed into the peripheral portion of the existing pile a while swinging using the jack portion 28 and the swing portion 29. At this time, when the casing 6 provided with the third jet water injection mechanism 24 is used, jet water can be jetted downward from the high-pressure water jet nozzle 23 to excavate the earth and sand of the peripheral wall portion 3.

Then, a pillar material 30 of a civil engineering machine such as a kelly bar of an earth drill machine or a drilling pipe of a reverse machine is connected to the center of the upper surface 2 of the bucket 4, and the bucket 4 is suspended by a crane by a wire. The swivel joint 12 has a high-pressure water pipe for each jet water injection mechanism 13.
15, high-pressure water hoses (not shown) for each high-pressure water flow path 18, 22 are individually connected, and at the rear end of the high-pressure water hose, high-pressure water injection nozzles 16, 21 of each jet water injection mechanism 13, 21, 24, 17, 19, 20
An ultra-high pressure water jet device (not shown) capable of controlling the jet water is connected for each. A hydraulic hose extending from a hydraulic mechanism (not shown) is connected to the cylinder mechanism 8 of each chuck mechanism 5.

The above-mentioned ultra-high pressure water jet device has a maximum of 3800
It has the capacity to discharge water at a maximum of 86 liters / minute at a pressure of Kg / cm ² , and each jet water injection mechanism 13, 21, 24
The water jetted from each of the high-pressure water jet nozzles 16, 17, 19, and 20 has a remarkably high pressure, and concrete and rebar can be sufficiently cut.

Then, the casing 6 is pushed in to remove the earth and sand above the existing pile a, and the bucket 4 suspended in the air is lowered by rotating the pillars 30 forward and reverse, for example, every 180 degrees, and at the same time, the first jet water jet is performed. The high-pressure water jet nozzle 16 of the mechanism 13 jets high-pressure water containing fine granular abrasives downward.

When high-pressure water is injected from the high-pressure water injection nozzle 16 while rotating the bucket 4 forward and backward and descending at a low speed, the vertical hole b is gradually formed at the center of the existing pile a due to the pressure of the high-pressure water, and the first jet water injection is performed. The mechanism 13 is gradually inserted, and the bucket 4 gradually sinks into the ground. Therefore, the bucket 4 is gradually attached to the upper side of the existing pile a, and cannot be further lowered when the packer 14 is placed on the upper surface of the existing pile a.

Therefore, if the jetting of the high-pressure water from the high-pressure water jet nozzle 16 is stopped and the bucket 4 is rotated in the forward and reverse directions every 90 degrees or every 180 degrees, the horizontal high-pressure water jet nozzles of the first jet water jetting mechanism 13 are provided. High-pressure water containing fine granular abrasives is jetted from 17 and each high-pressure water jet nozzle 20 facing the center of the second jet water jetting mechanism 21 (Fig. 2). The high-pressure water jetted from the high-pressure water jet nozzle 17 breaks horizontally from the center of the existing pile a toward the outer periphery, and the high-pressure water jetted from each high-pressure water jet nozzle 20 horizontally extends from the outer periphery of the existing pile a toward the center. While breaking, the reinforcing bar c near the outer circumference of the existing pile a is cut.

In this state, it may not be possible to sufficiently cut the existing pile a in the lateral direction. Therefore, the open upper end of the vertical hole b formed by the first jet water jetting mechanism 13 at the center of the existing pile a should be tightly closed with the packer 14. By injecting high-pressure water from the high-pressure water injection nozzles 16 and 17 to increase the pressure inside the existing pile a with water, the unbroken concrete portion is cut. In this way, the high-pressure water jet nozzle of the first jet water jet mechanism 13
High-pressure water injection nozzle of 17 and second jet water injection mechanism 21
When the existing pile a is sufficiently ruptured in the radial direction at 20 and the pressure inside the cutting is made high, the injection of high pressure water from each nozzle 16, 17, 20 is stopped and the first cylinder mechanism and the second cylinder mechanism are activated. First chuck mechanism 5a, second chuck mechanism
Reduce the diameter of each of 5b and make the outer peripheral surface of the fractured part of the existing pile a
The chuck mechanism 5a strongly fixes the bucket 4 and the second chuck mechanism 5b strongly fixes the bucket 4 to the casing 6.

If the tubing device 25 is operated in this state to rock the casing 6, the first chuck mechanism 5a and the second chuck mechanism 5b rock together with the casing 6, but the existing pile a does not rock. The strain force generated by the swing of 6 acts on the upper end portion of the existing pile a, and the fractured portion is threaded to cut the upper end portion of the existing pile a. In this case, in particular, a part of the reinforcing bars c that could not be cut by the high-pressure water jet nozzle 20 of the second jet water jetting mechanism 21 is cut together with the thread cutting of the existing pile a.

Therefore, the concrete portion of the existing pile a and the reinforcing bar c are almost cut by the high-pressure water jet nozzles 17 and 20,
The concrete portion is destroyed by water pressure by making the inside of the cutting of the existing pile a high pressure with water, and the rebar c is also sufficiently cut by rotating the upper end portion of the existing pile a.

By the above-mentioned operation, the fractured part of the existing pile a is entirely cut in the radial direction, so the swing of the tubing device 25 is stopped,
By operating the cylinder mechanism 8b and expanding the diameter of the second chuck mechanism 5b, the casing 6 is moved from the outer circumference of the bucket 4.
When the bucket 4 is lifted with the upper end portion of the existing pile a that has been cut while the diameter of the first chuck mechanism 5a is reduced while being fastened, the upper part of the broken portion of the existing pile a is It can rise and be removed to the ground.

Then, after removing the upper part of the existing pile a, the casing 6 is again lowered by the tubing device 25, and the bucket 4 is lowered in the same manner as above to be attached to the upper part of the existing pile a, and the existing operation is performed by the same operation as above. A part of the upper part of the pile a can be cut and removed, and by repeating this work in sequence, the entire length of the existing pile a can be removed from the ground.

Although the structure and method of the device of the present invention have been described based on the embodiment of the drawings, the present invention is not limited to this embodiment and can be implemented in any manner unless the configuration described in the claims is changed. be able to.

<Effects of the Invention> In short, according to the present invention, the casing is inserted into the peripheral portion of the existing pile buried in the ground, the rotatable bucket is inserted into the casing, and the casing is attached to the upper portion of the existing pile. However, the existing piles are ruptured in the radial direction by the jet water so that the existing piles can be cut, so that the piles in the ground can be removed reliably and efficiently in sequence only by operations on the ground. Since it can be ruptured, there is no pollution due to noise or vibration, and it is possible to remove existing piles even in residential areas and cities. Moreover, since the existing piles, which were not possible in the past, can be removed, the land can be effectively utilized, and the building as designed can be constructed, which is of high practical value.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a vertical side view, Fig. 2 is a partially cutaway plan view, and Fig. 3 is a vertical cross-sectional view in which an existing pile is broken. , Fig. 4 is IV-I in Fig. 3.
FIG. 5 is a vertical sectional view of another embodiment, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, FIG. 7 is a vertical sectional view of another embodiment, and FIG. Fig. 7 is a sectional view taken along line VIII-VIII, Fig. 9 is a lateral sectional view of another embodiment, Fig. 10 is a longitudinal sectional view of the same, Fig. 11 is a plan view of a tubing device, and Fig. 12 is the same as above. It is a front view. 1 ... removing device, 2 ... upper surface part, 3 ... peripheral wall part, 4 ...
Bucket, 5 ... Chuck mechanism, 6 ... Casing, 13
...... First jet water injection mechanism, 21 …… Second jet water injection mechanism.

Claims (2)

[Claims] 1. A casing is inserted into a peripheral portion of an existing pile that is buried in the ground by a tubing device, and a bucket that is rotatable in the casing and a chuck mechanism that can be fixed to the existing pile are provided. The pile removing device is attached to the upper part of the existing pile, and the lateral high-pressure water injection nozzle of the first jet water injection mechanism provided in the bucket and the second jet water injection provided on the peripheral wall of the bucket. By the jet water jetted from the inward high-pressure water jet nozzle of the mechanism, the existing pile is substantially ruptured in the radial direction at the substantially lower edge position of the bucket, and the upper part of the fractured part of the existing pile is fixed to the bucket by the chuck mechanism. At the same time, the casing and bucket are fixed, and the casing is swung by the tubing device and the reaction force is received by the existing pile to move upward from the broken portion. Cross, and the method of removing the existing pile, characterized in that to raise the pile removing apparatus so as to remove the broken part of the existing pile. 2. A bucket comprising: a casing having an open upper and lower surface that is inserted into a peripheral portion of an existing pile; and a bucket that is rotatable inside and has a chuck mechanism that fixes the upper portion of the existing pile. Has a disk-shaped upper surface portion and a peripheral wall portion suspended from the upper surface portion. The first upper surface of the bucket hangs down into the bucket and jets jet water downward and laterally. A second structure for providing a jet water jet mechanism and jetting jet water downward and inward at the lower end of the peripheral wall portion.
An apparatus for removing existing piles, characterized in that the jet water injection mechanism is provided, and the casing or bucket is provided with a chuck mechanism for fixing the casing and the bucket.