JPH09268555A - Pile drawing method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which makes it possible to cut a peripheral surface friction force between a pile and a natural ground in every part by means of a water jet and draw the pile without removing muddy water produced by the water jet and prevent the collapse of a pile hole after having pulled the pile and omit muddy water processing equipment which processes muddy water discharged from the water jet. SOLUTION: A water jet device which is provided with a jig 4, a casing 6 fixed with the lower end of this jig 4, a plurality of high pressure water nozzles 7 mounted on the outer periphery of this casing 6 and a high pressure water pipe 9 connected to the lower end of this high pressure water nozzle 7 is set so as to surround a part of the outer peripheral surface of a pile 1 to be pulled up. A pilot hammer 19 is fixed with the lower end of the jig 4 where a water jet 13 is elected from the high pressure water nozzle 7 and the water jet device 5 is pressed in alone the longitudinat direction of the pile 1 by means of a vibro hammer 18. After having cut the peripheral friction force between the pile and a natural ground G, it is so arranged that the water jet device 5 may be pulled up and the pile 1 may be drawn as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for pulling out existing foundation piles (existing piles), and more particularly to a method and apparatus for pulling out piles effective for pulling out existing piles with ultra-low vibration and ultra-low noise. .

[0002]

2. Description of the Related Art Conventionally, as a method of pulling out a pile, a pile, a vibro hammer, a large crane, etc. have been used to pull out and remove the pile. in this case,
Since it is difficult to pull out things with deep roots, we drilled around the piles to remove the natural ground and pulled out with less resistance. However, it may be continuous at a junction like steel sheet piles, or it may not be possible to secure a space for excavation.
That is, there is a problem that the frictional force may not be sufficiently cut.

As a construction method proposed to eliminate such inconvenience, for example, a technique described in Japanese Patent Laid-Open No. 6-240670 is known. 11 to 13 show the structure of such a conventional pile pulling device, FIG. 11 is a perspective view showing the relationship between the pile pulling device and the steel pipe sheet pile 33 driven into the ground, and FIG. 12 is the pile pulling out. Pile 31 that constitutes the device
13 is a plan view of the steel pipe sheet pile 44 and a pile 1A having a U-shaped cross section.
Alternatively, it is an enlarged plan view showing a relationship with a pile 1B having a C-shaped cross section.

In the drawings, 31 is a pile, 32 is a water jet pipe, 33 is a drain pipe, 34 is a pipe support plate, 35 is a seal member, 36 is a bolt, 40 is a vibro hammer, 41 is a pump, 42 is underground, 43 is a steel pipe sheet pile, 44 is a steel pipe, 45
Is a junction.

In the prior art, a pile 31 having a C-shaped section 1B or a U-shaped section 1A having a water jet pipe 32 and an earth discharging pipe 33 provided on one side and having a water jet pipe 32 inside is used.
The open side of 1 is directed toward the existing pile 43 to be pulled out, and is driven in close proximity to the existing pile 43 while chucking with the vibro hammer 40, and the sand is removed by the vibration by the vibro hammer 40 and the jet water from the thin water jet pipe 32. Collapse and excavate from the discharge pipe 33 to excavate the area surrounded by the C-shaped or C-shaped cross-section pile and the existing pile 43, and then pull out the existing pile 43 with a large crane,
I am trying to remove it.

[0006]

However, the above-mentioned prior art has the following problems. (1) High-pressure water is jetted from a thin water jet pipe 32, and the jet water W breaks down the earth and sand around the existing piles 43 to lift it. For example, in the configuration shown in FIG. The number of water jet pipes 32 for ejecting water is small (1 for 1A and 2 for 1B), so excavation is not sufficient, and the ground after collapse is collapsed. There is a case in which the peripheral surface frictional force between the existing piles 43 and the ground 42 is not sufficiently cut due to the pressure from the existing piles 43, and the existing piles 43 lose the tensile force and may be cut in the middle. (2) Since a strong pulling force of the existing pile 43 is required as in the case of (1) above, an accident such as cutting of a hanging wire or the like occurs, and the work is dangerous. (3) After the sediment around the existing pile is destroyed by jet water, the sediment is discharged by an excavation pipe, so the space between the existing pile and the pile for excavation is in the ground around the existing pile. On the other hand, negative pressure is generated, and the external pressure from the ground acts on the negative pressure area, and after pulling out the existing pile, the pile hole collapses without standing. (4) When the pile hole collapses after the pile is removed, the subsidence phenomenon occurs in the surrounding ground. (6) It is necessary to have equipment for treating muddy water discharged when the sediment around the existing piles is destroyed by jet water, industrial waste treatment, etc., and a space therefor is also required.

The present invention has been made in view of the above circumstances. An object of the present invention is to uniformly cut the circumferential frictional force between the pile to be pulled out and the natural ground with a water jet, and to remove muddy water by the water jet. The pile can be pulled out without removing it, and it can be applied to pull out various piles such as knotted piles and bottom piles, and there is no need to excavate the periphery of the pile to be pulled out on a large scale, and the collapse of the pile hole after pulling out can be increased. It can be prevented by a concentration of muddy water, and it is possible to omit equipment for treating muddy water discharged when cutting the frictional force between the pile and the surrounding ground by water jets and industrial waste treatment. An object is to provide a method and an apparatus for pulling out a pile.

Another object of the present invention is to provide a method of pulling out a pile in which the pile hole after pulling out the pile can be backfilled by utilizing high-concentration muddy water in the pile hole.

Another object of the present invention is to provide a pile pulling-out device which can be effectively applied to a pile having a knot, a pile having a bottom, and a pile having a bump in an intermediate portion due to poor construction.

[0010]

In order to achieve the above object, in the method of the present invention, the jig 4 and the pile fixed to the lower end portion of the jig 4 and having a cross-section to be pulled out are formed and A casing 6 that is larger than the outer shape of the pile, a plurality of high-pressure water nozzles 7 that are attached to the outer periphery of the casing 6 at predetermined intervals, and inside the jig 4, from the upper end of the jig 4. A part of the outer peripheral surface of the pile 1 to be pulled out from the water jet device 5 having a high pressure water pipe 9 attached to the vicinity of the casing 6 of the water jet device 5 and connected to the upper end of the high pressure water nozzle 7. The water jet device 5 is set so as to surround it, and the vibro hammer 1 is attached to the upper end of the jig 4 of the water jet device 5.
9 is fixed, each high-pressure water nozzle 7 of the water jet device 5 jets a water jet 13, and the water jet device 5 is press-fitted by the vibro hammer 19 along the length direction of the pile 1 to After cutting the frictional force with the natural ground G, the water jet device 5 was pulled up, and then the pile 1 was pulled out.

According to the method of the present invention, after the pile 1 is pulled out, the filling pipe 24 is inserted into the pile hole 2 and the solidified material 26 of mud is filled while air blowing.

Alternatively, the device of the present invention comprises a jig 4 and a casing 6 which is fixed to the lower end of the jig 4 and has a cross-section formed in conformity with the shape of the pile 1 to be pulled out and which is larger than the outer shape of the pile 1. And a plurality of high-pressure water nozzles 7 mounted on the outer periphery of the casing 6 at a predetermined interval, and inside the jig 4, from the upper end of the jig 4 to the casing 6 of the water jet device 5. A water jet device 5 having a high-pressure water pipe 9 attached to the vicinity and connected to the upper end of the high-pressure water nozzle 7.
A high pressure water nozzle, which is attached to the upper end of the jig 4 and applies a predetermined vibration to the jig 4, and high pressure water is supplied from the upper end of the high pressure water pipe 9 of the water jet device 5. Waterjet 13 from 7
And a high-pressure water supply source 12 for ejecting.

Further, in the apparatus of the present invention, a cemented carbide tip or hardened pad 14 formed in an edge shape is provided around the lower end of the casing 6 of the water jet apparatus 5.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show the basic construction of a pile pulling apparatus according to the present invention. FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a sectional view taken along line AA of FIG. , FIG. 4 is B of FIG.
It is an enlarged view of a part. Further, FIGS. 5, 6 and 7 are explanatory diagrams of a pulling-out process of the pile to be pulled out, and FIG. 8 is an explanatory diagram of a post-treatment process after pulling out the pile.

The pile pulling-out device 3 shown in these figures comprises a water jet device 5, a vibro hammer 19, and a high-pressure water supply source 12.

The jig 4 has a U-shaped cross section with an open opening, and is formed of steel sheet pile or shaped steel to be longer than the length of the pile 1 to be pulled out and narrower than the width of the pile 1. There is.

The water jet device 5 has a casing 6 and a high pressure water nozzle 7. The casing 6 is made of a steel plate as shown in FIGS.
As can be seen from the above, the pile 1 is formed in a crescent type cross section that surrounds almost the outer periphery of the pile 1, and is fixed to the inside (front side) of the lower end of the jig 4. The high pressure water nozzle 7
As can be seen from FIGS. 2, 3 and 4, a plurality of, for example, seven, are attached to the outer side (back side) of the casing 6 at a predetermined interval. Each high-pressure water nozzle 7 is branched from a nozzle branch portion 8 provided above it. Further, as shown in FIGS. 2 and 4, the lower end portion 7 ′ of each high pressure nozzle 7 is located slightly above the lower end portion of the casing 6, that is, a space h is provided between the lower end portion 7 ′ and the lower end portion of the casing 6. Stayed in position.

The high-pressure nozzle 7 is alternately mounted, for example, vertically downward and diagonally inward.

Inside the jig 4, as shown in FIG. 2, a high-pressure water pipe 9 is attached. The high-pressure water pipe 9 is provided from the connection port 10 provided at the upper end of the jig 4 to the nozzle branch portion 8 near the casing 6. A nozzle branch 8 of the high pressure water nozzle 7 is connected to the lower end of the high pressure water pipe 9.

The high-pressure water supply source 12 is installed on the ground. The high pressure water supply source 12 includes a high pressure water hose 11
The high-pressure water pipe 9 is connected through the connection port 10.

In this example, in addition to the pile pulling device 3, a steel casing 16, a crane (not shown) used for pulling the pile and filling the solidifying material, and a solidifying material filling device are provided.

The steel casing 16 is formed to have a diameter larger than a plane in which the periphery of the head of the pile 1 to be pulled out and the water jet device 3 are combined.

The crane includes a chain block 17
And a hook 18 are suspended and supported. And
When pulling out the pile, a vibro hammer 19 having a chuck 20 for gripping the pile head is attached to the hook 18. This vibro hammer 19 has a hydraulic hose 22
Is connected to the hydraulic unit 21 through.

The solidifying material filling device is provided with a solidifying material injection pipe 24 suspended and supported by the hook 18 of the crane. The solidified material injection pipe 24 is connected to a solidified material and air supply source (not shown) through a solidified material and air injection hose 25.

Next, the operation of pulling out the pile 1 and filling the pile hole 2 with the solidifying material 26 using the above-mentioned apparatus and equipment will be described.

When pulling out the pile 1, first, the ground G around the head of the pile 1 to be pulled out is larger than the outer shape of the pile 1, that is, the water jet device 5 set on the pile 1 and its peripheral portion. A steel casing 16 having a diameter larger than the flat plane is placed by a vibro hammer or a hydraulic press-fitting machine to prevent the ground G around the pile 1 to be pulled out from collapsing in advance.

As shown in FIG. 5, a vibro hammer 19 having a chuck 20 for gripping a pile head is attached to a hook 18 provided on a chain block 17 suspended and supported by a crane. Further, the vibro hammer 19 is connected to a hydraulic unit 21 through a hydraulic hose 22.

Then, as shown in FIG. 5, the upper end of the jig 4 of the pile pulling device 3 is held by the chuck 20 of the vibro hammer 19 attached to the hook 18 of the crane to vertically move the pile pulling device 3. The water jet device 5 of the hoisting / pile pulling-out device 3 is inserted into the steel casing 16 and set at a position surrounding the head of the pile 1 to be pulled out. Further, the high-pressure water pipe 9 installed in the jig 4 of the pile pulling-out device 3 is connected to the high-pressure water supply source 12 through the connection port 10 and the high-pressure water hose 11.

In this state, the high-pressure water supply source 12 → high-pressure water hose 11 → connection port 10 thereof → high-pressure water pipe 9 → high-pressure water is supplied to a plurality of high-pressure water nozzles 7 through the nozzle branch portion 8 as shown in FIG. As shown in, the water jet 13 is jetted downward from each high-pressure water nozzle 7.

At this time, since the high-pressure nozzles 7 vertically downward and the nozzles mounted obliquely inward are alternately arranged, the high-pressure nozzles 7 are not covered with the ground G in the peripheral portion of the pile 1. Can be drilled.

Subsequently, pressure oil is supplied to the vibro hammer 19 through the hydraulic unit 21 and the hydraulic hose 22,
By vibrating the vibro hammer 19, as shown in FIG.
The jig 4 of the pile pulling device 3 is vibrated while jetting the water jet 13 from each high-pressure water nozzle 7, and the jig 4 and the water jet device 5 are pressed in along the length direction of the pile 1 to be pulled out. . This operation is repeated a plurality of times around the pile 1 to loosen the sediment around the pile 1 to be pulled out, and to cut the peripheral frictional force between the pile 1 and the ground G around the pile 1.

As described above, after cutting the peripheral frictional force between the pile 1 and the ground G, the jetting of the water jet 13 from the high pressure water nozzle 7 and the vibration by the vibro hammer 19 are stopped, respectively, and the pile is piled by the crane. The jig 4 and the water jet device 5 of the pulling device 3 are pulled to the ground. Then, the chuck 20 holding the jig 4 is loosened, and the pile pulling device 3 is separated from the vibro hammer 19. Further, the vibro hammer 19 is removed from the hook 18 of the crane.

Then, as can be seen from FIG. 7, the head of the pile 1 to be pulled out is slid on the hook 18 of the crane by the hanging wire 28, and the pile 1 is pulled out by the crane. After pulling out the pile 1, the pile 1 is separated from the hook 18 of the crane. This pile pull-out work may be performed using a crane dedicated to pulling out the pile, which is different from the crane that suspends and supports the vibro hammer 19.

In this example, muddy water having a low strength is solidified without discharging muddy water generated when the frictional force between the pile 1 and the ground G by the water jet 13 is cut. When performing such solidification of mud, as can be seen from FIG. 8, the solidification material injection pipe 24 of the solidification material filling device is slid on the hook 18 of the crane by the hanging wire 28, and the solidification material injection pipe 24 is connected to the pile hole 2 Then, the solidification material 26 and the air 27 are supplied to the solidification material injection pipe 24 from the solidification material and air supply source through the solidification material / air injection hose 25.
While air blowing into the inside, a solidifying material 26 made of a cement-based material or a lime-based material is filled, and the muddy water in the pile hole 2 is solidified into low-strength mud.

Further, the inside of the steel casing 16 is backfilled with earth and sand or the like. Then, the steel casing 16 is pulled out by a vibro hammer, a hydraulic press-fitting machine or the like, and a series of work is completed.

According to the above-described example, when pulling out the pile 1, the water jet device 5 of the pile pulling-out device 3 preliminarily cuts the peripheral frictional force between the pile 1 and the natural ground G in advance, and then the pile 1 is removed. Since it is pulled out, (1) the pile 1 can be reliably pulled out with ultra-low vibration and ultra-low noise, and therefore it can be applied to the pull-out work in urban areas, and (2) the area around the pile 1 to be pulled out Since it is not necessary to excavate on a large scale, it can be constructed even in a narrow site, and (3) the peripheral frictional force between the pile 1 and the natural ground G can be cut evenly, so the pull-out force of the pile 1 is small, So you can cover it with a small crane,
(4) Since the peripheral frictional force between the pile 1 and the ground G can be efficiently cut, the pile 1 can be pulled out in a short time,
Therefore, the construction period can be shortened, and since it is not necessary to discharge high-concentration mud water at the time of ground cutting by the water jet 13, it is possible to prevent the ground G from collapsing and also to prevent the pile hole 2 from collapsing. (5) As a result of being able to prevent the ground G and the pile hole 2 from collapsing, it is possible to avoid the effects of ground subsidence on the surrounding ground and structures, and (6) should be pulled out. Since it is not necessary to cut the periphery of the pile 1 on a large scale, it is possible to omit equipment for treating muddy water discharged when cutting the frictional force between the pile 1 and the ground G and industrial waste treatment. There are benefits such as being possible.

Further, in this example, the jig 4 of the pile pulling-out device 3 is formed into an open U-shape which is narrower than the width of the pile 1 to be pulled out and smaller than the casing 6 of the water jet device 5. Therefore, the adhesion to the pile 1 is good, and the amount of friction and the amount of deposits at the time of press-fitting or pulling out the pile pulling-out device 3 itself can be reduced, and therefore the pile pulling-out device 3 can be pressed in and pulled out with a small force.

Further, in this example, the casing 6 of the water jet device 5 of the pile pulling-out device 3 is formed in an arc-shaped cross section, that is, a crescent type, and a plurality of high-pressure water nozzles are provided outside the casing 6 at a predetermined interval. Since 7 is attached, it can be applied to pulling out various piles 1 such as PC piles, RC piles, steel pipe piles, pine piles, triangular piles, cast-in-place piles, etc. Even if the shape of the piles 1 to be pulled out changes, By matching the shape of the casing with the shape of the pile (for example, a prismatic shape), it is possible to efficiently cut the peripheral frictional force between the pile 1 and the ground G.

Further, in this example, the water jet device 5 is used.
Since the high-pressure water nozzle 7 is attached to the outer side of the casing 6 of the above, the inner surface of the casing 6 can be brought close to the side surface of the pile 1 to be pulled out, so that the frictional force between the pile 1 and the ground G can be reduced. The effect of reducing the frictional force can be further increased, and when the pile pulling-out device 3 is press-fitted by the vibro hammer 19 along the length direction of the pile 1, the high-pressure water nozzle 7 causes the side surface of the pile 1 and the protrusions to move. Bang,
It is possible to prevent damage accidents.

Further, in this example, since the lower end of the high-pressure water nozzle 7 is kept above the lower end of the casing 4 of the jig 4 and the water jet device 5 with a slight gap h, the pile 1 It is possible to better prevent the high-pressure water nozzle 7 from being damaged by hitting the side surface of the stake or the protrusion of the pile 1.

Further, in this example, the water jet device 5 is used.
High pressure water nozzle 7 attached to the casing 6 of
, Which are vertically downward and those which are attached obliquely inward, are alternately arranged, so that the ground G in the peripheral portion of the pile 1 can be excavated without a gap.

Further, in this example, since the periphery of the head of the pile 1 to be extracted is surrounded by the steel casing 16 in advance, it is possible to better prevent the collapse of the ground G around the pile 1 to be extracted.

In this example, the water jet 13
The mud water generated when the frictional force between the pile 1 and the ground G is cut off is not discharged, but low-strength mud solidification is performed. Therefore, in this respect as well, mud water treatment equipment and industrial waste treatment, etc. Can be omitted.

[0045]

EXAMPLE Next, FIG. 9 shows a more specific example of the water jet device 5 according to the present invention, and is an enlarged side view of the jig 4 and the water jet device 5.

In the embodiment shown in FIG. 9, a cutting blade 14 formed of an edge-shaped cemented carbide chip or a hardened pad is provided at the lower end of the jig 4 and the lower end of the casing 6 of the water jet device 5. Has been.

In this embodiment, the pile pulling device 3 is press-fitted while cutting the protruding portions such as the piles having the nodes and the piles having the bottoms and the piles having the bump in the middle due to the poor construction by the cutting blade 14 to press the piles and the ground. It is possible to cut the peripheral frictional force with the mountain.

The other structure and operation of the embodiment shown in FIG. 9 are similar to those of the example shown in FIGS.

FIG. 10 shows still another embodiment of the device of the present invention, and is an enlarged side view of the jig and water jet device.

In the embodiment shown in FIG. 10, an edge-shaped cutting blade 15 is provided at the lower end of the jig 4 and the lower end of the casing 6 of the water jet device 5.

In the embodiment shown in FIG. 10 as well, the cutting blade 15 is used to press-fit the pile pulling-out device 3 while cutting the protrusions such as the piles having nodes and the bottomed piles and the piles having a bump in the middle due to poor construction. However, the peripheral frictional force between the pile and the ground can be cut.

The other construction and operation of the embodiment shown in FIG. 10 are similar to those of the embodiment shown in FIGS.

[0053]

As described above, according to the method and apparatus of the present invention, (1) the pile 1 can be pulled out after the peripheral surface frictional force between the pile to be pulled out and the ground is evenly cut by the water jet. Therefore, the pile can be reliably pulled out with ultra-low vibration and ultra-low noise, which is applicable to the pulling-out work in urban areas. (2) Since it is not necessary to excavate the area around the pile to be pulled out on a large scale, construction is possible even in a small site. (3) Since the peripheral frictional force between the pile and the ground can be cut evenly, the pulling-out force of the pile can be small and therefore can be covered by a small crane. (4) The peripheral frictional force between the pile and the ground can be efficiently cut, so that the pile can be pulled out in a short time, and therefore the construction period can be shortened, and at the time of ground cutting with a water jet. Since it is not necessary to discharge the high-concentration muddy water, it is possible to prevent the collapse of the ground and also the collapse of the pile hole. (5) As a result of preventing the collapse of natural ground and pile holes,
It is not necessary to affect the surrounding ground and structures such as subsidence of the ground. (6) Since it is not necessary to cut the periphery of the pile to be pulled out on a large scale, facilities for treating muddy water discharged when cutting the frictional force between the pile and the ground and industrial waste treatment are omitted. It becomes possible to do. (7) It can be applied to various pile extractions, does not require large-scale excavation around the piles to be extracted, can prevent collapse of the pile holes after the extraction of the piles with high-concentration muddy water, and uses water jets to It is also possible to omit the equipment for treating the muddy water discharged when cutting the frictional force with the surrounding ground and the industrial waste treatment. This has the effect.

Further, in the method of the present invention, the periphery of the head of the pile to be pulled out is preliminarily surrounded by the steel casing having a diameter larger than the plane of the pile and the water jet device set on the periphery thereof. There is an effect that the pile can be pulled out while the collapse of the ground around the pile to be pulled out is prevented in advance.

Further, in the method of the present invention, after the pile is pulled out, the pile hole is filled with the solidifying material of the mud while air-blowing, so that the pile hole after pulling out the pile is There is an effect that it can be backfilled using mud.

Alternatively, in the device of the present invention, a cutting blade capable of cutting the protrusion of the cast-in-place pile is provided around the lower end of the jig and the lower end of the casing of the water jet device. It has the effect that it can be effectively applied to expanded bottom piles and piles with a bump in the middle due to poor construction.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an embodiment of a device of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged view of a portion B in FIG. 2;

FIG. 5 is an explanatory view showing a process of pulling out a pillar to be pulled out.

FIG. 6 is an explanatory diagram of a drawing process following FIG.

FIG. 7 is an explanatory diagram of a drawing process subsequent to FIG. 6;

FIG. 8 is an explanatory diagram of a post-treatment process after pulling out the pile.

FIG. 9 shows an embodiment of a water jet device according to the device of the present invention, and is an enlarged side view of a portion of the water jet device.

FIG. 10 shows still another embodiment of the device of the present invention and is an enlarged side view of a water jet device portion.

FIG. 11 is a perspective view showing a relationship between a pile pulling-out device and a steel pipe sheet pile driven into the ground.

FIG. 12 is a plan view of a pile that constitutes the pile pulling-out device.

FIG. 13 is an enlarged plan view showing the relationship between a steel pipe sheet pile and a U-shaped cross-section pile or a C-shaped cross-section pile.

[Explanation of symbols]

1 Pile to be pulled out 2 Pile hole 3 Pile pulling device 4 Jig 5 Water jet device 6 Water jet device casing 7 High pressure water nozzle h Distance between lower end of jig and casing and lower end of high pressure water nozzle 8 Nozzle branch part 9 High-pressure water pipe 11 High-pressure water hose 12 High-pressure water supply source 13 Water jet 14,15 Cutting blade G Ground 16 Steel casing 19 Vibro hammer 24 Solidification material injection pipe of solidification material filling device 25 Solidification material, air injection hose 26 Solidification Material 27 Air 31 Pile 32 Water jet 33 Waste pipe 34 Pipe support plate 35 Seal member 36 Bolt 40 Vibro hammer 41 Pump 42 Underground 43 Steel pipe sheet pile 44 Steel pipe 45 Junction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiko Wakao 2-3-20 Toyo, Koto-ku, Tokyo Toyo Taun Center 305 Kyoshin Kiko Co., Ltd. (72) Yasunori Honda Honda Matsuzaki, Abeno-ku, Osaka-shi, Osaka 2-2, Machi Okumura Gumi Co., Ltd. (72) Inventor, Eiichi Akutsu 1-24-4 Shinkawa, Chuo-ku, Tokyo Daitoken Construction Co., Ltd.

Claims (4)

[Claims] 1. A jig (4) and a casing (6) which is fixed to the lower end of the jig (4) and whose cross section is formed in conformity with the shape of the pile to be pulled out and which is larger than the outer shape of the pile. A plurality of high-pressure water nozzles (7) mounted on the outer periphery of the casing (6) at a predetermined interval, and inside the jig (4), from the upper end of the jig (4) Pulling out the water jet device (5) having a high-pressure water pipe (9) attached to the vicinity of the casing (6) of the water-jet device (5) and connected to the upper end of the high-pressure water nozzle (7). It is set so as to surround a part of the outer peripheral surface of the power pile (1), and a vibro hammer (19) is fixed to the upper end of the jig (4) of the water jet device (5), and the water jet device (5) Each high pressure water nozzle The water jet (13) is jetted from 7), and the water jet device (5) is press-fitted by the vibro hammer (19) along the length direction of the pile (1), and the pile (1) and the ground (G) ), The water jet device (5) is pulled up, and then the pile (1) is pulled out, after cutting the peripheral frictional force with the pile. 2. The pipe (24) is inserted into the pile hole (2) after the pile (1) is pulled out, and the solidification material (26) of the mud is filled while air blowing. The method of extracting a pile according to claim 1. 3. A jig (4) and a pile (1) fixed to the lower end of the jig (4) and having a cross section which is formed in conformity with the shape of the pile (1) and is larger than the outer shape of the pile (1). Inside the casing (6), a plurality of high-pressure water nozzles (7) attached to the outer periphery of the casing (6) at a predetermined interval, and the jig (4). Water jet device (9) attached from the upper end of the water jet device (5) to the vicinity of the casing (6) of the water jet device (5) and connected to the upper end of the high pressure water nozzle (7). (5), a vibro hammer (19) attached to the upper end of the jig (4) to give a predetermined vibration to the jig (4), and a high-pressure water pipe (9) of the water jet device (5).
And a high-pressure water supply source (12) for supplying high-pressure water from the upper end portion of the nozzle and ejecting a water jet (13) from the high-pressure water nozzle (7). 4. A cemented carbide tip or hardened padding (14) formed in an edge shape is provided around the lower end of the casing (6) of the water jet device (5). Item 3. The pile pulling-out device according to item 3.