JPH0643698B2 - Method and device for removing existing piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method and an 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 constructing 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 an earthmoving 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 will have to be changed, resulting in extremely economical loss. .

<Means for Solving Problems> Therefore, according to the present invention, an inner peripheral wall portion of a cylindrical casing (4) having an open lower surface is provided on an upper portion of an existing pile (a) which is embedded in the ground. A pile removing device (1) having a rotatable first chuck mechanism (7) and a non-rotatable second chuck mechanism (8) provided below the first chuck mechanism (7) is attached, A first jet water injection mechanism (23) that hangs down from the upper surface of the casing (4) to the inner center of the casing (4) and injects jet water in the downward and lateral directions, and the casing (4). A second jet water jetting mechanism which is located between the first chucking mechanism (7) and the second chucking mechanism (8) inside and which jets jet water laterally toward the center of the casing (4). (28)
The existing pile (a) in the middle of the first chuck mechanism (7) and the second chuck mechanism (8) is substantially fractured in the radial direction by the jet water jetted from The first chuck mechanism (7) is fixed above the broken portion and the second chuck mechanism (8) is fixed below the substantially broken portion of the existing pile (a).
By rotating the chuck mechanism (7) of the
The upper part of the existing pile (a) is threaded and cut by the chuck mechanism (8) of the existing pile (a), and the upper part of the existing pile (a) is removed by raising it. And a cylindrical casing (4) having an open lower surface that is attached to the upper part of the existing pile (a) that is buried in the ground, and
A rotatable first chuck mechanism (7) provided on the inner peripheral wall portion of the casing (4) and a non-rotatable second chuck mechanism (7) provided below the first chuck mechanism (7). 8) and a first jet water jetting mechanism (2) that hangs down from the upper surface of the casing (4) into the casing (4) and jets jet water downward and laterally.
3) and between the first chuck mechanism (7) and the second chuck mechanism (8) inside the casing (4), and jets in the lateral direction toward the center of the casing (4). Second jet water injection mechanism (28) for injecting water
An existing pile removing device (1) comprising: a first chuck mechanism (7) and a second chuck on an inner peripheral wall of the casing (4) on an upper portion of the existing pile (a). And a mechanism (8) for depositing the first jet water jetting mechanism (2
3) and the jet water jetted from the second jet water jet mechanism (28), the existing pile (a) in the middle between the first chuck mechanism (7) and the second chuck mechanism (8).
Is substantially broken in the radial direction, the upper part of the existing pile (a) above the substantially broken part is fixed by the first chuck mechanism (7), and the part below the substantially broken part of the existing pile (a) corresponds to the first broken part. Two
Of the existing pile (a) by fixing it by the chuck mechanism (8), rotating the first chuck mechanism (7), and receiving the reaction force thereof by the second chuck mechanism (8). The present invention provides a device for removing an existing pile, which is characterized in that the upper part is threaded and cut from the part, and the upper part is removed from the cut part of the existing pile (a).

<Operation> According to the present invention having the above configuration, the rotatable first chuck mechanism (provided on the inner peripheral wall portion of the casing (4) above the existing pile (a) buried in the ground ( 7) and a non-rotatable second chuck mechanism (8) provided below the same, and hangs downward from the upper surface of the casing (4) to the center of the inside of the casing (4). A first jet water jetting mechanism (2
3) and the first chuck mechanism (7) inside the casing (4) and the second chuck mechanism (8), which is intermediate between the second chuck mechanism and the second chuck mechanism (8) for jetting jet water in the lateral direction toward the center of the casing (4). The existing pile (a) in the middle of the first chuck mechanism (7) and the second chuck mechanism (8) is substantially fractured in the radial direction by the jet water jetted from the jet water jetting mechanism (28) of The upper part of the pile (a) is fixed by the first chuck mechanism (7) and the lower part of the existing pile (a) is fixed by the second chuck mechanism (8). By rotating the chuck mechanism (1) of No. 1 and receiving the reaction force by the second chuck mechanism (8), the existing pile (a) is cut so as to be screwed upward from the substantially broken portion. It can be removed by raising it upward from the cut part of a). That. Therefore, by repeating the above-mentioned work in order, the full length portion of the existing pile (a) can be removed from the ground.

<Example> Hereinafter, the present invention will be described in detail based on an example of the drawings.

The existing pile removing apparatus 1 of the present invention includes an inner surface of a casing 4 having an open lower surface, which is composed of a disk-shaped upper surface portion 2 and a cylindrical peripheral wall portion 3 that hangs downward from an outer peripheral edge of the upper surface portion 2. A cylindrical rotary frame 5 is provided in the upper part, and an annular rocking gear 6 is integrally provided on the upper inner end of the rotary frame 5, and
A first chuck mechanism 7 is provided inside the rotary frame 5 below the swing gear 6 so as to rotate integrally with the rotary frame 5.
A second chuck mechanism 8 is integrally provided inside the casing 4 below the rotating frame 5.

A more specific configuration of the removing device 1 will be described. On the upper surface of the upper surface portion 2 of the casing 4, two hydraulic motors 9 and 9 with speed reducers are installed to face each other in the radial direction. A downward rotating shaft 10 extending from the motor 9 is passed through the upper surface portion 2 to be located inside the casing 4, and a drive gear 11 that meshes with an internal gear of the oscillating gear 6 is provided at the tip of the rotating shaft 10. Then, the rotating frame 5 and the first chuck mechanism 7 are provided on the inner wall of the peripheral wall portion 3 in the middle of the shelves 1
The rotation frame 5 and the first chuck mechanism 7 are rotatably supported by 2 and supported so as to be freely rotatable with respect to the peripheral wall portion 3.

The above-mentioned first chuck mechanism 7 is composed of chuck frames 13 and 13 having a semi-arcuate shape obtained by vertically dividing a cylindrical material into two as shown in FIGS. 8 and 9, and slides on the inner surface of each chuck frame 13. A vertical groove for forming fine irregularities for stopping, forming a plurality of vertical strips 14 on the inner surface of the rotating frame 5, and fitting the vertical strips 14 on the outer surface of each chuck frame 13 in correspondence with the vertical strips 14. 15 is formed so that the first chuck mechanism 7 can rotate together with the rotating frame 5 by the chuck frame 13 and the vertical strip 14 regardless of whether the diameter of the first chuck mechanism 7 is reduced or expanded. Cylinder mechanisms 16 and 16 are provided at the upper edge of the first chuck mechanism 7 so that the chuck frames 13 approach each other to reduce the diameter of the internal space, or separate and increase the diameter.

The second chuck mechanism 8 described above has substantially the same configuration as that of the first chuck mechanism 7 described above, and the second chuck mechanism 8 shown in FIGS.
As shown in the figure, it is composed of a semi-circular chuck frame 17, 17 obtained by vertically dividing a cylindrical material into two parts, and each chuck frame 17 has fine irregularities for slip prevention formed on the inner surface thereof. A plurality of vertical strips 18 are formed and each chuck frame 1 is formed.
A vertical groove 19 into which the vertical strip 18 is fitted is formed on the outer surface of the outer peripheral surface 7 of the chuck 7, and the peripheral wall is formed by the chuck frame 17 and the vertical strip 18 regardless of whether the second chuck mechanism 8 is in a reduced diameter state or an enlarged diameter state. The second chuck mechanism 8 can be rotated together with the portion 3. Cylinder mechanisms 20 and 20 are provided at the upper edge of the second chuck mechanism 8 so that the chuck frames 17 approach each other to reduce the diameter of the internal space or to increase the diameter by separating from each other. The lower edge of the second chuck mechanism 8 is received by the annular receiving member 21.

Further, in the above-described removing device 1, a swivel joint 22 is provided at the center of the upper surface portion 2 of the casing 4, is connected to the swivel joint 22, and the first jet water jetting mechanism is downwardly directed to the inner center portion of the casing 4. 23, the first jet water injection mechanism 23 is
4, a downward high-pressure water jet nozzle 26 and a horizontal high-pressure water jet nozzle 27 are provided at the lower end of a high-pressure water pipe 25 which is vertically provided via the nozzle 4.

Then, the casing 4 is provided with the second jet water injection mechanism 28 extending from the swivel joint 22 described above. The second jet water injection mechanism 28 includes a plurality of water jet injection mechanisms 28 extending from the swivel joint 22 in the radial direction of the upper surface portion 2. A high-pressure water pipe 29, a high-pressure water passage 30 extending vertically from the tip of each high-pressure water pipe 29 through the oscillating gear 6 and the chuck frame 13 of the first chuck mechanism 7, and a lower end of each high-pressure water passage 30. The high-pressure water jet nozzle 31 is provided, and the high-pressure water jetted from each high-pressure water jet nozzle 31 is directed laterally toward the center of the casing 4, and the high-pressure water jet nozzle 31 and the high-pressure water jet nozzle 27 are the same. Located at the height of.

Further, the casing 4 is provided with a third jet water injection mechanism 32 in addition to the first jet water injection mechanism 23 and the second jet water injection mechanism 28 described above. A plurality of high-pressure water channels 33 that extend in the radial direction from the swivel joint 22 inside the upper surface portion 2 and vertically pass through the inside of the peripheral wall portion 3, and at the lower end of each high-pressure water channel 33 at the lower edge of the peripheral wall portion 3. It is composed of a plurality of high-pressure water jet nozzles 34 provided, and directs the high-pressure water jetted from each high-pressure water jet nozzle 34 downward.

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, the pillar member 35 of the civil engineering machine such as the kelly bar of the earth drill machine or the drilling pipe of the reverse machine is connected to the center of the upper surface of the upper surface portion 2 of the casing 4, and the wire 3
The casing 4 is suspended by a crane (not shown) by means of 6. The swivel joint 22 is individually connected to a high-pressure water pipe 25, a high-pressure water pipe 29, and a high-pressure water hose 37 for each high-pressure water flow path 33 of each jet water injection mechanism. An ultra-high pressure water jet device (not shown) capable of controlling jet water is connected to each high-pressure water jet nozzle of the water jet mechanism. A hydraulic hose 38 extending from a hydraulic mechanism (not shown) is connected to both the hydraulic motors 9, the cylinder mechanism 16 of the first chuck mechanism 7, and the cylinder mechanism 20 of the second chuck mechanism 8.

Note that the above-mentioned ultra-high pressure water jet device has a maximum of 38
It has the capacity to discharge water at a maximum amount of 86 liters / minute at a pressure of 00 kg / cm ^{2, and} the water jetted from each high-pressure water jet nozzle of each jet water jet mechanism becomes extremely high pressure, and concrete and rebar Can be fully cut.

When the above preparatory work is completed, the surface layer casing 39 made of a metallic cylindrical material is driven into the ground to remove the earth and sand above the existing pile a, and the casing 4 suspended in the air is supported by the pillar member 35, for example, 180 While descending while rotating in the normal and reverse directions at every ° C, at the same time, the high-pressure water jet nozzle 26 of the first jet water jetting mechanism 23 jets high-pressure water containing fine granular abrasives, and at the same time, the third jet water jetting mechanism 32. The high pressure water is jetted downward from each high pressure water jet nozzle 34.

When high-pressure water is injected from the high-pressure water injection nozzle 26 while rotating the casing 4 forward and backward and descending at a low speed,
A vertical hole is gradually formed in the center of the existing pile a by the pressure of the high-pressure water, and the first jet water jetting mechanism 23 is gradually inserted, and the high-pressure water jetted from the high-pressure water jet nozzle 34 is the sediment on the outer periphery of the existing pile a. And the casing 4 gradually sinks into the ground. Therefore, the casing 4 is gradually attached to the upper side of the existing pile a, and cannot be further lowered when the packer 24 is placed on the upper surface of the existing pile a.

Therefore, the high-pressure water jet nozzle 26 and the high-pressure water jet nozzle 34
Stop the injection of high-pressure water from the
The high-pressure water injection nozzle 27 of the first jet water injection mechanism 23 and the second high-pressure water injection nozzle
The high-pressure water jet nozzles 31 of the jet water jetting mechanism 28 are used to jet high-pressure water containing fine granular abrasives (FIG. 3). The high-pressure water jetted from each high-pressure water jet nozzle 27 is located at an intermediate portion between the first chuck mechanism 7 and the second chuck mechanism 8 of the existing pile a on the plane passing through each high-pressure water jet nozzle 27. From the center of the existing pile a to the outer periphery, the high-pressure water jetted from each high-pressure water jet nozzle 31 horizontally breaks the existing pile a from the outer periphery to the center, and cuts the reinforcing bar near the outer periphery of the existing pile a. To do.

In this state, the existing pile a may not be sufficiently cut in the lateral direction. Therefore, the open upper end of the vertical hole formed by the first jet water jetting mechanism 23 is located at the center of the existing pile a and the packer 24
Then, the high pressure water injection nozzle 27 injects high pressure water to increase the pressure inside the cutting of the existing pile a with water to cut the unbroken concrete portion. In this way, the high-pressure water jet nozzle 27 and the high-pressure water jet nozzle 3
When the existing pile a is sufficiently ruptured in the radial direction at 1 and the inside of the cutting is made to have a high pressure, the injection of the high pressure water from each nozzle is stopped, and the cylinder mechanism 16 of the first chuck mechanism 7 and the second chuck mechanism 8 are stopped. Oil is pressure-fed to the cylinder mechanism 20 to reduce the diameters of the first chuck mechanism 7 and the second chuck mechanism 8, and the outer peripheral surface above the substantially broken portion of the existing pile a is firmly fixed by the first chuck mechanism 7. Then, the outer peripheral surface below the substantially broken portion of the existing pile a is firmly fixed by the second chuck mechanism 8.

When both hydraulic motors 9 are driven in this state and the oscillating gear 6 is rotated by the drive gear 11, the oscillating gear 6 causes the rotating frame 5 to rotate.
The first chuck mechanism 7 rotates but the second chuck mechanism 8 does not rotate through, so that the strain force generated by the rotation of the first chuck mechanism 7 acts on the upper end portion of the existing pile to cause the second chuck mechanism to rotate. It is received by the mechanism 8, the above-mentioned substantially broken portion is threaded, and the upper end portion of the existing pile is cut. in this case,
In particular, some of the reinforcing bars that could not be cut by the high-pressure water injection nozzle 31 of the second jet water injection mechanism 28 are cut together with the thread cutting of the existing pile.

Therefore, the high-pressure water jet nozzles 27 and 31 almost cut the concrete part and the reinforcing bars of the existing pile, but the concrete part is more destroyed by making the inside of the cutting of the existing pile high pressure with water, and the upper end of the existing pile is also cut. By rotating the part, even the rebar is sufficiently cut.

Since the fractured part of the existing pile a is entirely cut in the radial direction by the above-described operation, the rotation of the oscillating gear 6 is stopped, and the oil is supplied to the cylinder mechanism 20 to expand the diameter of the second chuck mechanism 8. By removing from the outer circumference of the existing pile a,
When the diameter of the first chuck mechanism 7 is fixed to the outer periphery of the existing pile a with the diameter reduced and the casing 4 is raised in this state, the upper part of the broken portion of the existing pile a rises together with the casing 4 and is removed to the ground. be able to.

Then, after removing the upper part of the existing pile a, the casing 4 is lowered again to cover the upper part of the existing pile a, and the upper part can be cut and removed by the same operation as above, and this work is repeated in order. As a result, 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 rotatable first chuck mechanism (7) provided on the inner peripheral wall portion of the casing (4) is provided above the existing pile (a) buried in the ground. ) And a non-rotatable second chuck mechanism (8) provided therebelow, and hangs downward from the upper surface of the casing (4) to the inner center of the casing (4) and laterally. The casing (4) is located in the middle of the first chuck mechanism (7) and the second chuck mechanism (8) inside the casing (4) and the first jet water jet mechanism (23) for jetting jet water to ) 2nd jet of water jets towards the center of
The existing pile (a) in the middle of the first chuck mechanism (7) and the second chuck mechanism (8) is substantially fractured in the radial direction by the jet water jetted from the jet water jetting mechanism (28) of The upper part of the pile (a) is fixed by the first chuck mechanism (7) above the substantially broken part, and the lower part of the existing pile (a) is fixed by the second chuck mechanism (8),
By rotating the first chuck mechanism (7), the reaction force is changed to the second
The chuck mechanism (8) of (1) cuts the upper part of the existing pile (a) so that the upper part of the pile (a) is screwed up.
It is possible to remove the existing pile (a) by cutting it upward and removing it, and by repeating the work of the upper part in order to remove the full length portion of the existing pile (a) from the ground, It is possible to remove piles in the ground one after another reliably and efficiently, and since it can be broken by jet water, there is no pollution due to noise and vibration, and it is possible to remove existing piles even in residential areas and cities. it can. 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 Figs. 3 and 4 show a state in which an existing pile is broken. Fig. 5 is a vertical cross-sectional view of the state where the cut portion is removed, Fig. 6 is a schematic front view of the state where it is attached to the upper part of the existing pile, and Fig. 7 is Fig. 1 VI.
FIG. 8 is a sectional view taken along line I-VII, FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 1, FIG. 9 is a sectional view taken along line IX-IX of FIG. 1, and FIG.
11 is a sectional view taken along line XI-XI in FIG. 1. FIG. 11 is a sectional view taken along line XX-X in FIG. 1 is a removing device, 4 is a casing, 5 is a rotating frame, 6 is a swing gear, 7 is a first chuck mechanism, 8 is a second chuck mechanism, 11 is a drive gear, 22 is a swivel joint, and 23
Is a first jet water jetting mechanism, and 28 is a second jet water jetting mechanism.

Claims (2)

[Claims] 1. A first chuck mechanism (7) rotatable on an inner peripheral wall portion of a cylindrical casing (4) having an open lower surface on an upper portion of an existing pile (a) which is buried in the ground. ) And a non-rotatable second chuck mechanism (8) below the first chuck mechanism (7) are attached, and a pile removing device (1) is attached to the casing (4) from the upper surface portion thereof. A first jet water jetting mechanism (23) that hangs down to the center of the inside of the casing (4) and jets jet water downward and laterally, and the first chuck mechanism (7) inside the casing (4). ) And a second jet water injection mechanism (28) for injecting jet water laterally toward the center of the casing (4) located between the second chuck mechanism (8) and The first chuck mechanism (7) and the second chuck mechanism The existing pile (a) in the middle of (8) is substantially fractured in the radial direction, and the upper portion of the substantially fractured portion of the existing pile (a) is fixed by the first chuck mechanism (7) and the existing pile ( The second chuck mechanism (8) is located below the substantially broken portion of a).
The first chuck mechanism (7) is rotated, and the reaction force thereof is received by the second chuck mechanism (8), so that the upper portion of the existing pile (a) is threaded and cut upward. Then, the method for removing the existing pile is characterized in that the upper part is removed from the cut portion of the existing pile (a) by lifting upward. 2. A cylindrical casing (4) having an open lower surface, which is attached to the upper portion of an existing pile (a) which is buried in the ground, and an inner peripheral wall of the casing (4). A rotatable first chuck mechanism (7) provided, a non-rotatable second chuck mechanism (8) provided below the first chuck mechanism (7), and a casing (4) A first jet water jetting mechanism (23) that hangs down from the upper surface into the casing (4) and jets jet water downward and laterally; and the first jet water jetting mechanism inside the casing (4). A second jet water jetting mechanism (28) which is located between the chuck mechanism (7) and the second chuck mechanism (8) and jets jet water laterally toward the center of the casing (4); An existing pile removing device (1) comprising: The first chuck mechanism (7) and the second chuck mechanism (8) of the inner peripheral wall of the casing (4) are attached to the upper part of (a), and the first jet water jet mechanism (23) is attached. And the second chuck water jetting mechanism (28) jetting water from the first chuck mechanism (7).
The existing pile (a) between the second chuck mechanism (8) and the second chuck mechanism (8) is substantially fractured in the radial direction, and the upper portion of the existing pile (a) is stopped by the first chuck mechanism (7) above the substantially fractured portion. The second chuck mechanism (8) fastens the lower part of the existing pile (a) below the substantially broken portion, and rotates the first chuck mechanism (7) to apply the reaction force to the second pile. Existing chucking mechanism (8) is used to cut the upper part of the existing pile (a) from above the substantially broken portion by threading, and to lift and remove the upper part from the cut part of the existing pile (a). Pile removal device.