JP2001146745A - Method and device for pulling out pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and definitely pull out an existing foundation pile without leaving a certain portion in the middle only by pulling out with a vibration pile driving machine while giving vibration. SOLUTION: A pile pull-out device equipped with a short-sized casing 12 to the lower portion of a plate body 10 of a channel sheet pile-shaped of a plate body 10 having a recessed portion 11 on one surface of the sheet pile or the like is used, the short-sized casing 12 is fitted to the pile periphery from the upper end of the existing pile 16 while the upper end of the plate body 10 is attached to the vibration pile driving machine 15 and vibration is applied, the plate body 10 and the short-sized casing 12 is lowered and the relation between the existing pile 16 and the ground is cut off at the portion of the short-sized casing 12, and the existing pile 16 projecting out upward from the short-sized casing 12 is positioned along the recessed portion 11 of the plate body 10, and the existing pile 16 and the plate body 10 are fastened with a fastening material 17 such as wire or the like, and the existing pile 16 along the plate body 10 is pulled out together with the plate body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile pull-out apparatus and a pile pull-out method for removing a pile driven into the ground as a foundation pile.

[0002]

2. Description of the Related Art In rebuilding buildings such as buildings, in addition to demolition of old buildings, old foundation piles in the ground are once removed.
It is well known that a new foundation pile needs to be created to match the structure of a new building. However, such old foundation piles cannot be easily removed.

[0003] That is, when the foundation pile is a concrete pile, due to its nature, it is strong against compressive force but inherently weak against tensile force. It may be cracked or buckled by compression. In addition, when the foundation pile is a steel pipe pile, in addition to the buckling due to the above-described shearing force and compression, it is conceivable that erosion is caused by acidic groundwater or the like in the ground, and the proof strength is partially reduced. In addition, due to the building's decades of loading and natural consolidation, the piles have become fully compatible with the surrounding ground, increasing the frictional forces.

[0004] For these reasons, the old foundation pile cannot be easily removed with a crane or the like, and if it is forcibly removed, the pile may be completely broken and the lower end of the pile may remain in the ground.

As a countermeasure method for the case where the lower end of the pile remains in the ground, Japanese Patent Laid-Open No. 54-133708 discloses a method as shown in FIG.
-Underground pile removal method as shown in Fig. 13 has been proposed.

As shown in FIG. 7, when the pile 2 driven into the soft ground 1 is pulled out, the metal fitting 2 connecting the upper and lower piles 2a and 2b for some reason.
When c is damaged, only the upper pile 2a is closed, and the lower pile 2b is left in the state shown in FIG. 8, the casing 3 prepared in advance is used.

As shown in FIG. 9, the casing 3 is of a steel tubular shape, has a plurality of claws 4, 4 facing downward at a step portion at the lower end, and has a wire mounting piece 5 in the middle. A hook of a wire with a base 6 whose tip is connected to a ring whose diameter can be reduced is fixed to the wire mounting piece 5, and the ring 6 a is fitted around the lower casing of the claws 4, 4. . A driving member 7 is connected to an end of the casing 3 upward and long, and a vibrating pile driving machine 8 is chucked on the top of the driving member 7.

The casing 3 prepared as described above is suspended by a crane, placed on the ground so that the pile is removed from the center, and driven into the ground by a vibrating pile driving machine 8. As shown in FIG. 10, regardless of the driving of the casing 3, the loop 6 a of the wire 6 with the base is pressed by the claws 4 and 4 and does not shift to the upper side of the casing until the casing 3 reaches the middle of the lower pile 2 b. It fits in a predetermined position.

As shown in FIG. 11, when the casing 3 is driven into a moderate position and the lower pile 2b is set in the casing 3, the driving is stopped and the casing 3 is gradually pulled up. Due to this pulling, the loop 6a of the wire 6 with the base comes out of the lower end of the casing due to the resistance of the ground 1, and remains around the lower pile 2b.

As shown in FIG. 12, when the casing 3 is further pulled up, since the movement of the ring 6a is hindered by the soil around the lower pile, the wire 6 with the base is
To be stretched straight from the surrounding area. When the casing 3 is lifted, the ring 6a is moved to the lower pile 2b.
And the diameter is reduced by being pulled by the wire 6 with the base, and the lower pile 2b is tightened to be connected to the casing 3. As shown in FIG. 13, as a result, the lower pile 2b is pulled out of the ground together with the casing 3 by the base wire 6.

[0011]

The above-mentioned Japanese Patent Application Laid-Open No. 54-133708.
The underground pile removal method disclosed in the publication is effective as a countermeasure method when the lower end of the pile remains in the ground. However, since the pile is lifted by the wire 6 with the base, the existing pile is left in the ground as it is. Not suitable for pulling out. Even underground pile removal method disclosed in Japanese Patent Application Laid-Open No. 54-133708,
The prerequisite for pulling out the pile is the same as the conventional method.Not only is it impossible to easily pull out the old foundation pile, but if you try to forcibly pull it out, the pile is completely broken and the lower end of the pile is in the ground. Remains.

Various pile removal methods other than the above have been proposed, and there is a method in which a device for ejecting air or water from a casing pipe is added to cut off the edge of the pile and the ground so that the pile can be easily pulled out. . However, incorporating an air or water jetting device requires a large-scale device itself, and the operation is complicated and troublesome.

An object of the present invention is to solve the disadvantages of the prior art, and to pull out an existing foundation pile simply and reliably without leaving the middle just by pulling out while vibrating with a vibrating pile driver. An object of the present invention is to provide a pile pulling device and a pile pulling method.

[0014]

In order to achieve the above object, according to the present invention, as a pile pulling device, first, a short casing is provided at a lower end portion of a channel sheet pile-like plate having a concave portion on one surface such as a sheet pile. Secondly, the short casing is provided with excavation claws at the tip, third, the short casing is placed on a sheet pile-shaped plate and provided in the recess thereof, and fourth, the short casing is The gist is to form a window hole for discharging the earth.

The pile pulling method uses a pile pulling device in which a short casing is attached to the lower end of a channel sheet pile-like plate having a concave portion on one side such as a sheet pile, and the upper end of the plate is attached to a vibrating pile driver to vibrate. , Insert the short casing around the pile from the upper end of the existing pile, lower the plate and the short casing, cut the edge of the existing pile and the ground at the short casing part, and move it up above the short casing. The gist of the pile is that the existing pile and the plate are tightly connected to each other with a wire or the like along the concave portion of the plate, and the existing pile along the plate is pulled out.

According to the first and fifth aspects of the present invention, a channel sheet-sheet-like plate having a concave portion on one surface such as a sheet pile is used for placing an existing pile in the concave portion and pulling out the existing pile together. It acts as a guide plate.
That is, while attaching the upper end of the plate to the vibrating pile driver and applying vibration, the short casing is fitted around the pile from the upper end of the existing pile, the plate and the short casing are lowered, and the existing pile and the ground are lowered at the short casing part. The existing pile which cuts the edge and goes upward from the short casing can be pulled out integrally with the plate by aligning it with the concave portion of the plate. As a result, the foundation pile is a concrete pile, and due to its nature, it is strong in compressive force but weak in tensile force, and cracks have been generated due to shearing force at the time of pile driving or for many years, Even if it buckles due to compression, it can be reliably pulled out together with this plate.

According to the second aspect of the present invention, in addition to the above-described operation, the short casing is provided with an excavation claw at the tip, so that the short casing is lowered to cut the edge of the existing pile and the ground at the short casing portion. However, the cutting efficiency can be increased by the excavation claw.

According to the third aspect of the present invention, the short casing is placed on the sheet-like plate and provided in the recess thereof, so that the short casing has a strong integrity with the sheet-like plate. In addition, the existing pile, which goes upward from the short casing, smoothly follows the concave portion of the plate body as it is.

According to the fourth aspect of the present invention, since the short casing has a window hole for discharging the soil, the short casing is lowered to cut the edge of the existing pile and the ground at the short casing portion. The earth and sand entering the inside is discharged from the window hole, and there is no possibility that the inside of the short casing is clogged with the earth and sand and hinders the relative movement with the existing pile.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of a pile pulling device of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a plan view of the same, and 10 is a channel sheet pile having a concave portion 11 on one surface such as a sheet pile. It is a plate. The sheet pile, which is a steel sheet pile normally used for mountain retaining, etc., can be used as it is.

A short casing 12 made of a steel pipe was attached to the lower end of the sheet-like plate 10. For this installation,
The short casing 12 is placed on the sheet 10
And mounted by welding or the like. This makes the sheet-like sheet
The lower end of 10 is connected along the outer periphery of the short casing 12.

The short casing 12 has a cutting claw 13 at its tip.
Is provided. The excavation claw 13 may be formed by making a cut in the lower end of the short casing 12, or may be a component to which a separate member such as a bit such as a carbide tip is attached.

Further, a window hole 14 for discharging the earth is formed in the short casing 12.

Next, the usage will be described. 4 to 6 are front views showing each step of the pile pulling method of the present invention. In the drawings, reference numeral 16 denotes an existing pile such as a concrete pile.

The pile pulling out device of the present invention mounts the short casing 12 from the upper end of the existing pile 16 while attaching the upper end of the sheet pile 10 to the vibrating pile driver 15 and applying vibration.
Fit around 16 piles. At this time, the short casing 12 cuts the ground with the excavation claw 13 at the tip, and the cut soil that enters the inside of the short casing 12 is removed to the outside from the window hole 14 for discharging the earth.

Thus, the sheet pile 10 and the short casing 12 are lowered to cut the edge of the existing pile 16 and the ground at the short casing 12.

As a result, the portion of the existing pile 16 which is higher than the short casing 12 is arranged along the concave portion 11 of the sheet-like plate body 10 and is partially fitted in the concave portion 11.

When the short casing 12 is lowered to the tip of the existing pile 16, the existing pile 16 and the sheet-like plate 10 are tightened by winding a binding material 17 such as a wire or a wire, and the vibration pile driver is used.
Pull out the existing pile 16 while applying vibration at 15.

[0029]

As described above, the pile pulling device and the pile pulling method of the present invention can simply and reliably remove the existing foundation pile without leaving the middle only by pulling out while vibrating by the vibrating pile driver. It can be pulled out.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a pile pulling device of the present invention.

FIG. 2 is a front view showing one embodiment of a pile pulling device of the present invention.

FIG. 3 is a plan view showing one embodiment of a pile pulling device of the present invention.

FIG. 4 is a first diagram illustrating an embodiment of the pile pulling method of the present invention.
It is a front view of a process.

FIG. 5 is a second diagram illustrating an embodiment of the pile pulling method of the present invention.
It is a front view of a process.

FIG. 6 is a third view showing one embodiment of the pile pulling method of the present invention.
It is a front view of a process.

FIG. 7 is a front view of a first step showing a conventional example.

FIG. 8 is a front view of a second step showing the conventional example.

FIG. 9 is a front view of a third step showing the conventional example.

FIG. 10 is a front view of a fourth step showing the conventional example.

FIG. 11 is a front view of a fifth step showing the conventional example.

FIG. 12 is a front view of a sixth step showing the conventional example.

FIG. 13 is a front view of a seventh step showing the conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ground 2 ... Pile 2a ... Upper pile 2b ... Lower pile 2c ... Bracket 3 ... Casing 4 ... Claw 5 ... Wire mounting piece 6 ... Wire with base 6a ... Ring 7 ... Driving member 8 ... Vibration pile driver 10 ... Sheet pile -Shaped plate 11 ... recess 12 ... short casing 13 ... drilling claw 14 ... window hole 15 ... vibrating pile driver 16 ... existing pile 17 ... binding material

Claims (5)

[Claims] 1. A pile pulling device comprising a short casing attached to a lower end of a channel sheet-like plate having a concave portion on one surface such as a sheet pile. 2. The pile pulling device according to claim 1, wherein the short casing has an excavation claw at a tip thereof. 3. The pile pulling-out device according to claim 1, wherein the short casing is placed on a sheet-sheet-like plate and provided in a recess thereof. 4. The pile pulling device according to claim 1, wherein the short casing forms a window hole for discharging the soil. 5. A pile pulling device in which a short casing is attached to a lower end of a channel sheet-like plate having a concave portion on one surface such as a sheet pile, and an upper end of the plate is attached to a vibrating pile driver and vibrated. The short casing is fitted around the pile from the upper end of the existing pile, and the plate and the short casing are lowered to cut the edge of the existing pile and the ground at the short casing part. A pile pulling method, wherein an existing pile and a plate are tied together with a wire or the like along a concave portion of the body, and the existing pile along the plate is pulled out along the pile.