JPH01146016A - Method and apparatus for removing existing pile - Google Patents

Abstract

PURPOSE:To exactly remove existing piles by a method in which the first rotary chuck mechanism and the second fixed chuck mechanism are set on the upper part of an existing pile, and the pile is broken radially by water jet and cut off by both the chuck mechanism. CONSTITUTION:A remover 1 to remove existing piles (a) buried in the ground consists of the first rotary chuck mechanism 7 to hold the upper periphery of the pile, the second fixed chuck mechanism 8 to fix the periphery of the pile right below the mechanism 7, a jet nozzle 26 hung down from the center of the mechanism 7, and a jet nozzle 31 hung down from the periphery. The remover 1 is attached to the upper end of pile while drilling a hole in the nozzle 26 at the center of the upper end of the pile (a). The upper end of the pile (a) is cut by both the nozzles 26 and 31 and removed by turning the mechanism 7. The existing pile can thus be exactly and effectively broken and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an existing pile removal method and apparatus for removing existing piles that are buried underground and are no longer needed.

(Conventional technology) As we know, to constitute the foundation of buildings.

Or, many piles are formed underground for purposes such as ground improvement.

However, when demolishing an old building and constructing a new one in its place, or when making new underground improvements, the old existing piles often get in the way and need to be removed.

In general, new buildings tend to be larger and taller than older ones, so old existing piles cannot adequately support new buildings, and even if old piles are Even if they are used as support piles for new buildings, the strength of concrete and reinforcing bars deteriorates over a long period of time, and there is little value in using them.
It is a danger.

<Problems to be Solved by the Invention> Conventionally, relatively small-scale existing piles could be removed by excavating around the existing piles or pulling them out using civil engineering machinery;
The reality is that it cannot be removed using large-scale existing piles, or it is necessary to gradually remove it over a long period of time using extremely large-scale civil engineering machinery.

If the old existing piles cannot be removed, new piles will have to be installed in locations that avoid these piles, which will require a change in the design of the entire building, resulting in a huge economic loss. .

(Means for Solving the Problems) Therefore, the present invention includes a rotatable first chuck mechanism and a non-rotatable second chuck mechanism on the top of an existing pile that is buried underground. A pile removing device is attached, and jet water sprayed from the pile removing device almost ruptures the existing pile in the radial direction between the first chuck mechanism and the second chuck mechanism, and the upper part of the broken part of the existing pile is By fixing the pile with a first chuck mechanism, fixing the lower part of the broken part of the existing pile with a second chuck mechanism, rotating the first chuck mechanism, and receiving the reaction force with the second chuck mechanism. A method for removing an existing pile, characterized in that the upper part is cut off from the broken part and removed by raising it, and a rotatable first casing is installed inside a casing with an open lower surface and is attached to the upper part of the existing pile. A chuck mechanism and a non-rotatable second chuck mechanism are provided, and a first jet water injection mechanism is provided on the L side of the casing to hang down inside the casing and spray jet water in the downward and lateral directions. , inside the casing there is a first chuck mechanism and a second chuck mechanism.
A second jet water injection mechanism is provided between the chuck mechanism and the second jet water injection mechanism that sprays jet water laterally, and the first jet water injection mechanism and the second jet water injection mechanism are used to radiate the existing pile. The present invention provides an existing pile removal device characterized by being designed to break in one direction.

<Examples> The present invention will be described in detail below based on examples shown in the drawings.

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

To explain a more specific configuration of the above-mentioned removing device 1, two hydraulic motors 9 with reduction gears are installed facing each other in the radial direction on the upper surface of the upper surface portion 2 of the casing 4, and
A downward rotating shaft 10 extending from each hydraulic motor 9 is placed inside the casing 4 through the upper surface 2, and a drive gear 11 that meshes with the internal gear of the oscillating gear 6 is provided at the tip of the rotating shaft 10. establish. The rotating frame 5 and the first chuck mechanism 7 are rotatably supported by a shelf board 12 placed halfway on the inner surface of the peripheral wall 3, and the rotating frame 5 and the first chuck mechanism 7 are The chuck mechanism 7 is supported so that it can rotate freely.

As shown in FIGS. 8 and 9, the first chuck mechanism 7 described above consists of semicircular arc-shaped chuck frames 13 and 13 made by vertically dividing a cylindrical material into two parts, and slides on the inner surface of each chuck frame 13. A plurality of longitudinal grooves 14 are formed on the inner surface of the rotating frame 5 by forming minute irregularities for stopping, and longitudinal grooves are formed on the outer surface of each chuck frame 13 into which the longitudinal stripes 14 are fitted in correspondence with the longitudinal stripes 14. 15, so that the first chuck mechanism 7 can rotate together with the rotation frame 5 by the chuck frame 13 and the vertical strips 14 even when the first chuck mechanism 7 is in the diameter-reduced state or the diameter-expanded state. Cylinder mechanisms 16 and 16 are provided on the upper edge of the first chuck mechanism 7 to allow each chuck frame 13 to approach each other to reduce the diameter of the internal space, or to separate and expand the diameter thereof.

Further, the second chuck mechanism 8 described above has almost the same configuration as the first chuck mechanism 7 described above, and is shown in FIGS. 10 and 11.
As shown in the figure, it consists of a semi-circular chuck frame 17.17 made by dividing a cylindrical material into two in the vertical direction, and minute irregularities are formed on the inner surface of each chuck frame 17 to prevent slipping. While forming a plurality of vertical stripes 18, each chuck frame 1
A vertical groove 19 into which the vertical strip 18 is inserted is formed on the outer surface of the chuck frame 17 and the vertical strip 18 so as to correspond to the vertical strip 18, and the chuck frame 17 and the vertical strip 18 prevent the second chuck mechanism 8 from collapsing into the circumferential wall even when the second chuck mechanism 8 is in the contracted or expanded diameter state. The structure is such that the second chuck mechanism 8 can rotate together with the part 3. A cylinder mechanism 20 , 20 is provided at the upper edge of the second chuck mechanism 8 , and the cylinder mechanism 20 , 20 is provided at the lower end of the peripheral wall 3 so that each chuck frame 17 approaches to reduce the diameter of the internal space, or moves away from the cylinder mechanism 20 to expand the diameter. The lower edge of the second chuck mechanism 8 is received by the annular receiving member 21 .

Also, the removal equipment mentioned above! In 11, a swivel joint 22 is provided at the center of the upper surface 2 of the casing 4, and a first jet water injection mechanism 23 is provided downward in the swivel joint 22.

The first jet water injection mechanism 23 has a downward high-pressure water injection nozzle 26 and a sideways high-pressure water injection nozzle 27 provided at the lower end of a high-pressure water pipe 25 that is vertically installed through a packer 24.

The casing 4 is provided with a second jet water injection mechanism 28 extending from the swivel joint 22 described above. A plurality of high-pressure water pipes 29 extend, a high-pressure water flow path 30 passes vertically from the tip of each high-pressure water pipe 29 through the swing gear 6 and the chuck frame 13 of the first chuck mechanism 7, and each high-pressure water flow path 30 It consists of a high pressure water injection nozzle 31 provided at the lower end.

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 positioned at the same height.

Furthermore, 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, but this third jet water injection mechanism Reference numeral 32 denotes a plurality of high-pressure water passages 33 extending from the swivel joint 22 in the radial direction inside the upper surface part 2 and passing vertically inside the peripheral wall part 3, and a lower end of each high-pressure water passage 33 of the peripheral wall part 3. It consists of a plurality of high-pressure water injection nozzles 34 provided on the lower edge, and the high-pressure water injected from each high-pressure water injection nozzle 34 is directed downward.

The specific configuration of the removing device l in the present invention is as described above, and the method for removing old and unnecessary existing piles a buried underground using this removing device l is as follows. by.

That is, a pillar material 35 of a civil engineering machine such as a Kerry bar of an earth drill machine or a drilling pipe of a reverse machine is connected to the center of the upper surface of the upper surface part 2 of the casing 4, and the wire 3
6, the casing 4 is suspended by a crane (not shown). and.

The swivel joint 22 includes high pressure water pipes 25 and 29 of each jet water injection mechanism. The high pressure water hoses 37 for each high pressure water flow path 33 are connected individually, and the high pressure water hoses 37
At the rear end, there is an ultra-high pressure water jet device (
(not shown). In addition, one hydraulic motor 9 and the first
The cylinder mechanism 16 of the chuck mechanism 7. A hydraulic hose 38 extending from a hydraulic mechanism (not shown) is connected to the cylinder mechanism 20 of the second chuck mechanism 8 .

By the way, the ultra-high pressure water jet mentioned above? It has the ability to spout water at a maximum of 86 liters/minute at a maximum pressure of 3800 kg/c2, and the water jetted from each high-pressure water jet nozzle of each jet water jet mechanism is extremely high. The pressure is high enough to cut through concrete and reinforcing steel.

When the above preparation work is completed, the surface layer casing 39 made of a metallic cylindrical material is driven into the ground, the earth and sand above the existing pile a is removed, and the casing 4 suspended in the air is raised by the pillar material 35 to a height of, for example, 1800 m At the same time, high-pressure water containing fine granular abrasive is jetted from the high-pressure water jet nozzle 26 of the first jet water jet mechanism 23, and at the same time, high-pressure water containing fine granular abrasive is jetted from the high-pressure water jet nozzle 26 of the first jet water jet mechanism 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 lowering it at low speed,
A vertical hole is gradually formed in the center of the existing pile a by the pressure of high-pressure water, and the first jet water injection mechanism 23 is gradually inserted. is excavated, and the casing 4 gradually sinks into the ground. Therefore, the casing 4 is gradually attached above the existing pile a, and the packer 24 cannot be lowered any further when it reaches the upper surface of the existing pile a [t].

Therefore, the high pressure water injection nozzle 26 and the high pressure water injection nozzle 34
Stop the high-pressure water injection from the casing 4 and
Each high-pressure water injection nozzle 27 of the first jet water injection mechanism 23 and the second
High-pressure water containing fine granular abrasives is jetted from each high-pressure water jet nozzle 31 of the jet water jet mechanism 28 (
(Fig. 3), the high-pressure water injected from each high-pressure water injection nozzle 27 breaks the existing pile a horizontally from the center to the outer periphery, and the high-pressure water injected from each high-pressure water injection nozzle 31 breaks the existing pile a from the outer periphery. The existing pile a fractures horizontally towards the center.
Cut the reinforcing bar near the outer periphery.

In this state, it may not be possible to cut the existing pile a sufficiently in the horizontal direction. Therefore, the open upper end of the vertical hole formed by the first jet water injection mechanism 23 at the center of the existing pile
By injecting high-pressure water from the high-pressure water injection nozzle 27 and increasing the pressure inside the cutting of the existing pile a with water, the concrete portion that did not break is cut off. In this way, the high pressure water injection nozzle 27 and the high pressure water injection nozzle 3
When the existing pile a is sufficiently broken in the radial direction in step 1 and the inside of the cutting is made high pressure, the injection of high pressure water from each nozzle is stopped, and the cylinder mechanism 16 of the first chuck mechanism 7 and the cylinder mechanism 16 of the second chuck mechanism 8 are Oil is force-fed to the cylinder mechanism 20 and the first chuck mechanism 7. The diameter of the second chuck mechanism 8 is reduced, the outer circumferential surface above the broken part of the existing pile a is firmly fixed with the first chuck mechanism 7, and the outer circumferential face below the broken part of the existing pile a is fixed to the outer circumferential surface below the broken part of the existing pile a. It is firmly fixed by the chuck mechanism 8.

In this state, when the both sleeve pressure motor 9 is driven and the drive gear 11 rotates the swing gear 6, the swing gear 6 causes the rotation frame 5 to rotate.
The first chuck mechanism 7 rotates through the mechanism, but the second chuck mechanism 8 does not rotate, so the strain force generated by the rotation of the first chuck mechanism 7 acts on the upper end of the existing pile, causing the second chuck to rotate. It is received by the mechanism 8, and the broken portion is threaded to cut the upper end portion of the existing pile. In this case, especially the high pressure water injection nozzle 3 of the second jet water injection mechanism 28
This involves cutting some of the reinforcing bars that could not be cut in step 1, along with threading the existing piles.

Therefore, the high-pressure water injection nozzle 27.31 cuts most of the concrete part and reinforcing bars of the existing pile, but by applying high pressure inside the cut part of the existing pile with water, the concrete part is further destroyed, and the upper end of the existing pile By rotating the parts, even reinforcing bars can be cut sufficiently.

As a result of the above-mentioned operation, the broken portion of the existing pile a is completely cut in the radial direction, so the rotation of the rocking gear 6 is stopped, oil is supplied to the cylinder mechanism 20, and the diameter of the second chuck mechanism 8 is expanded. At the same time as removing it from the outer periphery of the existing pile a,
When the first chuck mechanism 7 is fixed to the outer periphery of the existing pile a with its diameter reduced and the casing 4 is raised in this state, the upper part of the broken part of the existing pile a is raised together with the casing 4 and removed to the ground. be able to.

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 operation is repeated in order. By doing so, 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 above based on the embodiments shown in the drawings, the present invention is not limited to these embodiments, and can be carried out in any manner as long as the structure described in the claims is not changed. be able to.

(Effects of the Invention) In summary, according to the present invention, a pile removal device having a rotatable first chuck mechanism and a non-rotatable second chuck mechanism is attached to the top of an existing pile buried underground, Since the existing piles are broken in the radial direction by jet water and cut by the operation of both chuck mechanisms, it is possible to reliably and efficiently remove underground piles in sequence simply by operating on the ground. Since they can be broken by water, there is no pollution caused by noise or vibration, and existing piles can be removed even in residential areas and cities.Also, since existing piles can be removed, which was previously considered impossible, land can be used more effectively. It can be used effectively, buildings can be constructed as designed, and it has high practical value.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a longitudinal side view, Fig. 2 is a partially cutaway plan view, and Figs. 3 and 4 show an existing pile broken. Figure 5 is a vertical cross-sectional view with the cut portion removed, Figure 6 is a schematic front view of the pile attached to the top of the existing pile, and Figure 7 is the same as Figure 1.
Figure 8 is a cross-sectional view along lines ■~■ in Figure 1, Figure 9 is a cross-sectional view along lines ■~■ in Figure 1, and Figure 1θ is a cross-sectional view along lines ■~■ in Figure 1.
The X-ray cross-sectional view, FIG. 11, is a cross-sectional view of FIG. 1 from Σ to XIwi. 1 is a removal device, 4 is a casing, 5 is a rotation 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, 23
28 is a first jet water injection mechanism, and 28 is a second jet water injection mechanism. Patent applicant Production Technology Center Co., Ltd. Figure 4

Claims (2)

[Claims] (1) A pile removal device having a rotatable first chuck mechanism and a non-rotatable second chuck mechanism is attached to the top of an existing pile that is buried underground, and the pile removal device The existing pile between the first chuck mechanism and the second chuck mechanism is almost ruptured in the radial direction by jet water sprayed from the jet water, and the upper part of the broken part of the existing pile is fixed by the first chuck mechanism, and the existing pile is The lower part of the broken part of the pile is fixed with a second chuck mechanism, the first chuck mechanism is rotated, and the reaction force is received by the second chuck mechanism, thereby cutting the part above the broken part, lifting it, and removing it. A method for removing existing piles characterized by (2) A rotatable first chuck mechanism and a non-rotatable second chuck mechanism are provided inside a casing with an open bottom surface that is attached above the existing pile; A first jet water injection mechanism that hangs down and sprays jet water in the downward and lateral directions is provided, and a first chuck mechanism is located inside the casing between the first chuck mechanism and the second chuck mechanism. A second jet water injection mechanism that injects jet water laterally is provided, and the existing pile is ruptured in the radial direction by the first jet water injection mechanism and the second jet water injection mechanism. Equipment for removing existing piles.