JP2820247B2 - Pile pull-out method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for pulling out and removing piles such as temporary piles, and more particularly to a pile suitable for pulling out and removing piles connected at a junction such as a steel pipe sheet pile. The present invention relates to a drawing method and apparatus.

[0002]

2. Description of the Related Art Conventionally, a pile such as a temporary pile has been pulled out and removed with a pulling jack, a vibratory hammer, a large crane, or the like. However, it was difficult to pull out deeply buried objects, etc., so they dug around the stake and pulled out with less resistance. However, in the case of steel pipe sheet piles, they are excavated in a wall shape because they are continuous at the junction, which is difficult. There is also a method of loosening the periphery with a drilling machine or a water jet from above, but it is difficult to drill along the pile.

For example, Japanese Patent Laid-Open Publication No. Hei 4-16619 discloses a technique for pulling out an existing pile by driving a jet casing around the existing pile to cut off the existing pile. However, such a known technique is suitable for an existing pile having a small diameter, but a pile having a large diameter requires an even larger jet casing, which makes the operation troublesome.
Furthermore, it cannot be applied to the case of continuous piles. Also,
Japanese Patent Publication No. 59-22851 discloses a technique in which jet water is jetted from a water supply pipe to form a pile, and excavated earth and sand is excavated from a discharge pipe. However, such a known technique does not disclose a technique for pulling out an existing pile.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and an apparatus for pulling out a pile, which can easily pull out a pile having a large diameter or a continuous pile.

[0005]

According to the method of the present invention,
The pile head of a C-shaped or U-shaped pile with one side open and provided with a water jet pipe and a discharge pipe inside is chucked with a vibro hammer, and the open side of the pile is pulled out to an existing pile that is pulled out Driving in close proximity to the existing pile, vibrating the pile with a vibro hammer, jetting jet water from a water jet pipe, and shaking the existing pile with the vibration and jet water into the space surrounded by the pile The earth and sand is collapsed, the collapsed earth and sand is lifted by a discharge pipe, and the existing pile is pulled out after the space is excavated.

According to the apparatus of the present invention, a pile driven in is provided adjacent to an existing pile to be withdrawn, and the pile is open on one side and has a C-shaped or U-shaped cross section. Is provided with a water jet pipe and a discharge pipe, and a seal member is attached to an open end of the pile, a pile head of the pile is chucked with a vibro hammer, and high-pressure water is supplied to the water jet pipe. It has a pump to supply.

[0007]

[Explanation of the operation and effect] The pile is driven with its open side facing the existing pile and chucked with a vibro hammer in close proximity to the existing pile, and the sediment is broken by the vibration of the vibro hammer and the jet water from the water jet pipe. The earth is excavated from the discharge pipe, and the area surrounded by the C-shaped or U-shaped pile and the existing pile is excavated. At that time, the inside of the C-shaped or U-shaped pile becomes negative pressure with respect to the surroundings, and the C-shaped or U-shaped pile tends to be pressed against the existing pile. This enables excavation closer to the existing pile. In this way, if a part around the existing pile can be pulled out while being excavated, the existing pile is pulled out and removed by a crane or the like.

[0008]

2 and 3 show a pile which constitutes a pile pulling-out device. The pile 1 has a U-shaped cross section 1A or a C-shaped cross section 1B (FIG. 5) with one side open. Are provided with a water jet pipe 2 and a discharge pipe 3. In the illustrated example, one water jet pipe 2 and two discharge pipes 3 are attached by a pipe support plate 4. A seal member 5 made of a rubber material or the like is attached to the open end of the pile 1. 2 and 3, reference numeral 6 denotes a bolt for attaching the pipe support plate 4 to the pile 1, reference numeral 7 denotes a joint plate for connecting the pile 1, and reference numeral 8 denotes the water jet pipe 2 and the discharge pipe 3.
Joint pipe.

FIGS. 1 and 5 show a steel pipe sheet pile 13 driven into the ground 12. The steel pipe sheet pile 13 is composed of a steel pipe 14 and a junction 15 connecting the steel pipe sheet pile 13 to the steel pipe sheet pile 13.
That is, a mode in which the existing pile is pulled out using the C-shaped or U-shaped piles 1A and 1B shown in FIGS. 2 and 3 described above will be described.

One side is open and the water jet tube 2 is
The pile head of the C-shaped or U-shaped cross section 1 provided with the discharge pipe 3 is chucked with a vibro hammer 10, and the opening side is directed toward the existing pile 13 and is driven close to the existing pile 13. .

Vibration is applied to the pile 1 by a vibratory hammer 10, and a high-pressure water pump 11 is connected to the water jet pipe 2 through a pipe elbow 9 (FIG. 4) to jet jet water W from the water jet pipe 2. And the jet water W to break the earth and sand, and lift S from the discharge pipe 3. At this time, the earth removal amount is made sufficiently larger than the supply jet water.

In the soil, the area A surrounded by the piles 1A and 1B and the existing pile 14 in FIG. 5 is excavated, and the area A is excavated (drilled). At this time, the insides of the piles 1A and 1B become negative pressure with respect to the surroundings, and the piles 1A and 1B are pressed against the existing piles 14 by the external pressure P. This enables excavation closer to the existing pile 14.

Next, the existing pile 14, ie, the steel pipe sheet pile, is pulled out and removed with a crane or the like.

[0014]

As described above, according to the present invention, the following excellent effects can be obtained. (A) Because part around the existing pile can be easily excavated,
Almost the entire circumference can be excavated in about two times, and the work is easy especially in the case of a large diameter pile or a continuous pile such as a steel pipe sheet pile. (B) The inside of the C-shaped or U-shaped pile becomes negative pressure,
Since the pile is pressed against the existing pile by the earth pressure, the soil can be easily discharged and excavation can be performed near the existing pile. (C) The action of pressing the pile against the existing pile is ensured by the vibrohammer.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention for pulling out a steel pipe sheet pile.

FIG. 2 is a front view of a C-shaped or U-shaped pile constituting the pile pulling device.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a front view showing a state where the pile of FIG. 3 is chucked with a vibro hammer.

FIG. 5 is an enlarged plan view showing a relationship between a steel pipe sheet pile and a pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... C-shaped or U-shaped pile 2 ... Water jet pipe 3 ... Discharge pipe 4 ... Pipe support plate 5 ... Seal member 6 ... Bolt 7 ... Joint plate 8 ... Joint pipe 9 ... Pipe elbow 10 ... Vibro hammer 11 ... Pump 12 ... Underground 13 ... Steel pipe sheet pile 14 ... Steel pipe 15 ... Junction

Claims (2)

(57) [Claims] 1. A pile head having a C-shaped or U-shaped cross section provided with a water jet pipe and a discharge pipe provided on one side and having a water jet pipe and a discharge pipe provided inside, is chucked with a vibro hammer, and the open side of the pile is pulled out. Driving the existing pile close to the existing pile and applying vibration to the pile with a vibro hammer,
Jet water is jetted from the water jet pipe to break the earth and sand in the space surrounded by the pile driven into the existing pile by the vibration and the jet water, and the collapsed earth and sand is discharged by an earth removal pipe, and the space is discharged. A method of pulling out an existing pile after being excavated. 2. A pile which is driven adjacent to an existing pile to be withdrawn, the pile being open on one side and having a C-shaped or U-shaped cross section. A discharge pipe is provided, and a seal member is attached to an open end of the pile, a pile head of the pile is chucked with a vibro hammer, and a pump for supplying high-pressure water to the water jet pipe is provided. A pile pulling device.