JP2013159960A - Sheet pile pulled-out part filling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet pile pulled-out part filling method with which, when filling a cavity of a ground caused by pulling out a sheet pile with a coagulable filling solution such as cement bentonite, immediate settlement just after pulling-out can be suppressed by filling the cavity simultaneously with pulling out the sheet pile, and works can be executed efficiently at low cost.SOLUTION: When filling a cavity of a ground caused by pulling out a sheet pile 1 with a coagulable filling solution 3, a filling solution storage pit B in contact with a sheet pile line A is excavated and formed on a surface of the ground and while storing the filling solution 3 in the pit B, pulling-out is started successively from the sheet pile 1 positioned within the pit B, thereby performing filling simultaneously with pulling-out.

Description

The present invention relates to measures for suppressing settlement of the surrounding ground accompanying sheet pile drawing, and more particularly, a method for filling a sheet pile drawing portion by filling a solid filling liquid such as cement bentonite into a void in the ground caused by sheet pile drawing. About.

In the sheet pile method, which is a type of mountain retaining method, the sheet pile that has functioned as a mountain retaining material should not be diverted to other construction sites after the backfill of the excavated ground has been completed, nor leave any underground remains. It is often drawn out and collected for the purpose. However, if the surrounding soil collapses into the gap in the ground caused by pulling out the sheet pile, it may cause problems such as subsidence of the surrounding ground and damage to the paved road surface and underground pipes, which has a great social impact. .

The sheet pile extraction part filling method, in which a solid space filling liquid such as cement bentonite is filled in the voids in the ground generated by the drawing of the sheet pile, has a better filling property than the case of filling the voids with sand. It is effective as a measure to suppress the settlement of the surrounding ground due to pulling out the ground.
As this type of sheet pile drawing portion filling method, the following two types are known.

First, as seen in Patent Document 1, a special sheet pile provided with a pipe for injecting a filling liquid in advance is used for retaining, and after the backfill of the excavation ground is completed, the filling liquid is introduced from the tip of the pipe. This is a method of pulling out the sheet pile while injecting the water.

The other is to pull out the required number of sheet piles, secure the machine installation area on the ground, and then install an injection machine such as a boring machine at that position. This is a method of pulling out the sheet pile while injecting the filling liquid from the bottom to the top with the pipe inserted into the pipe.

The former requires a special sheet pile that lacks versatility, which adds cost.
Moreover, every time the sheet pile is pulled out, there is an operation of connecting a hose that supplies a cemented filling liquid such as cement bentonite to a pipe attached to the sheet pile, and an operation of starting and stopping a pump for supplying the filling liquid in small increments. There is a problem that it is necessary and the filling operation is complicated.

In the latter method, after the sheet pile is pulled out, the injection machine is installed to start the injection, so a time lag occurs between the drawing operation and the filling operation, and the immediate settlement immediately after the drawing cannot be suppressed. There is. Moreover, since the filling liquid is injected and filled from the bottom to the top with a tube inserted deeply into the ground, it takes a long time for filling, and the construction period tends to be long, so that filling can be done in a short time. Increasing the injection pressure may cause problems such as breakage or deformation of underground pipes. In addition, every time the sheet pile is pulled out, it is necessary to start and stop the pump for supplying the filling liquid in small increments, which is much different from the former method in that the filling operation is complicated.

JP 49-49404 A JP-A-57-151722

The present invention has been made in view of the above-mentioned problems, and the object is as follows.
An object of the present invention is to provide a method for filling a sheet pile drawing portion that can prevent immediate settlement immediately after drawing and can be efficiently constructed at low cost.

In order to achieve the above object, technical measures taken by the present invention are as follows. That is,
The sheet pile drawing portion filling method according to the invention of claim 1 is a method of filling a solid space filling liquid into a void in the ground generated by drawing a sheet pile, and is a filling liquid storage pit in contact with the sheet pile row Is excavated and formed on the ground, and with the filling liquid stored in the pit, the sheet is sequentially pulled out from the sheet pile located in the pit.

Invention of Claim 2 is the sheet pile drawing-out part filling method of Claim 1, Comprising: Filling liquid storage pit is formed in the local vertical hole shape which touches a part of sheet pile row | line | column. It is characterized by.

The invention according to claim 3 is the sheet pile drawing portion filling method according to claim 1, wherein the filling liquid storage pit is formed in a groove shape along the sheet pile row.

Invention of Claim 4 is the sheet pile drawing-out part filling method in any one of Claims 1-3, Comprising: From the top to the bottom by the filling liquid storage pit in the space | gap of the ground which arises by drawing of a sheet pile The sheet pile is used in combination with a method of filling the filling liquid and a method of injecting and filling the filling liquid from the bottom to the top with a pipe inserted into the ground using an injection machine such as a boring machine. It is characterized by sampling.

According to the first aspect of the present invention, since the filling liquid in the pit is filled in the gap simultaneously with the drawing of the sheet pile, it is possible to suppress immediate settlement immediately after the drawing. In particular, the filling liquid is sucked by the negative pressure generated by pulling out the sheet pile, and a high filling property is obtained. That is, when the first sheet pile is pulled out, the filling liquid in the pits flows into the gap by its own weight, but even if air accumulation occurs on the bottom side of the gap, the next adjacent sheet By pulling out the pile, the negative pressure generated by the pulling out sucks the filling liquid in the pit and the filling liquid previously injected into the gap, thereby eliminating the air pool.

Moreover, the conventional technology eliminates the need for a boring machine required for filling liquid filling and a special sheet pile that lacks versatility, and each time the sheet pile is pulled out, the pump for filling liquid supply is started and stopped in small increments. Such complicated work can be omitted, and the cost can be reduced, the construction efficiency can be improved, and the construction period can be shortened.

According to the invention described in claim 2, since the filling liquid storage pit is in the form of a local vertical hole in contact with a part of the sheet pile row, a building such as a building or an underground outer wall is constructed near the sheet pile row. Even if it is done, there exists an advantage that the pit for filling liquid storage can be excavated and formed in the position which avoided these.

According to the invention of claim 3, since the filling liquid storage pit is formed in a groove shape along the sheet pile row, by pulling out the sheet pile one by one along the groove,
The filling liquid is always sucked and filled from the position close to the ground gap generated by the drawing. Therefore, the filling property is improved and more efficient construction is possible.

The groove-shaped filling liquid storage pit is used for the solidifying filling liquid such as cement bentonite to solidify, the sheet pile drawing process by vibro hammer, crane, etc., or the temporary setting process of the pulled sheet pile. May be excavated sequentially for each length corresponding to the construction section determined in consideration of the drawing time per sheet pile limited by the time, the working time of the day, etc. To improve the efficiency of excavation work, it is possible to excavate a groove that covers almost the entire length at once, and divide the inside of the groove by a partition material that can be attached and detached to create a pit for storing the filling liquid. It is effective in.

According to the fourth aspect of the present invention, the filling liquid is filled from the top to the bottom with the filling liquid storage pits in the voids in the ground caused by the drawing out of the sheet pile, and the filling is performed by a machine for injection such as a boring machine. Since the method of injecting and filling the filling liquid from the top to the top is used in combination, it can be filled quickly even at a deep site.

It is a top view which illustrates an embodiment of a sheet pile extraction part filling method concerning the present invention. It is a vertical side view of the principal part which shows the state before extraction. It is a vertical side view of the principal part which shows the state in extraction work. It is a top view which shows other embodiment of this invention. It is a perspective view. It is a vertical front view of the principal part which shows the state before extraction. It is a vertical side view of the principal part which shows the state in extraction work. It is a vertical side view of the principal part which shows the state in extraction work. It is a vertical side view of the principal part which shows other embodiment of this invention.

Hereinafter, a first embodiment of a sheet pile drawing portion filling method according to the present invention will be described with reference to the drawings. FIGS. 1 and 2 illustrate the storage of the filling liquid in contact with the sheet pile row A after excavating the inner ground of the retaining wall by the sheet pile 1 and backfilling with a high quality backfill 2 for the purpose of removing contaminated soil. A state in which a pit B for excavation is formed on the ground and a caking filler liquid 3 such as cement bentonite is stored in the pit B is shown.

In the illustrated embodiment, the pit B is in the form of a local vertical hole that contacts a part of the sheet pile row A, and is suitable for a plurality of locations on the inner ground (backfill soil 2) surrounded by the sheet pile row A. Excavation is formed at intervals. In FIG. 2, 4 is a natural ground (excavation bottom before backfilling), 5 is a boundary between the site and the road, and 6 is an existing underground underground pipe installed under the road.

As shown in FIG. 2, with the filling liquid 3 stored in the pit B, as shown in FIG. 3, the suspension pile 7 of the mobile crane, the vibro hammer 8 or the like is used to place the sheet pile 1 in the pit B. Pull out one by one from the ones that are located in sequence. The liquid level in the pit B is monitored, and the pit B is replenished with the filling liquid 3 sent by the hose 9 from a plant not shown in the figure so as to maintain a constant liquid level.

According to the above configuration, a gap is generated in the ground by pulling out the sheet pile 1, but as described above, by pulling out the sheet pile 1 in contact with the filling liquid 3 in the pit B, the pit B
The inside filling liquid 3 is filled in the gap simultaneously with the withdrawal of the sheet pile 1. Therefore,
Immediate settlement immediately after withdrawal can be suppressed. And the filling liquid 3 will be attracted | sucked by the negative pressure which arises by drawing | extracting the sheet pile 1, and high filling property is acquired.

Further, in the above embodiment, since the filling liquid storage pit B is in the form of a local vertical hole contacting a part of the sheet pile row A, as shown by the phantom line in FIG. Even if the building C such as a building or an underground outer wall is constructed, the pit B can be provided at a position avoiding them.

4 to 8 show a second embodiment of the present invention. This embodiment is characterized in that the filling liquid storage pit B is formed in a groove shape along the sheet pile row A. The width and depth of the groove-like pit B can be set as appropriate. In the illustrated example, the width is set to 500 mm and the depth is set to 400 mm.

According to the above configuration, as shown in FIGS. 4 and 5, the filling liquid storage pit B is formed in a groove shape along the sheet pile row A, so that one sheet pile 1 is provided along the groove. By successively pulling out one by one, the filling liquid 3 is always sucked and filled from the position close to the ground gap generated by the drawing. Further, when the first sheet pile 1 is pulled out, the filling liquid 3 in the pit B flows into the gap by its own weight. However, as shown in FIG. Even if the pool 10 is generated, by pulling out the next adjacent sheet pile 1, the filling liquid 3 in the pit B or the filling liquid 3 previously injected into the gap is generated by the negative pressure generated by the drawing. As a result of the suction, as shown in FIG. 8, the air reservoir 10 due to the above-described filling failure is eliminated. Therefore, the filling property is improved, and a more efficient construction is possible.

In addition, although the groove-shaped filling liquid storage pit B may be excavated sequentially for each length corresponding to the construction section, in the illustrated embodiment, as shown in FIG. 4, the efficiency of excavation work is increased. For this purpose, a groove having a length over the entire length or substantially the entire length of the sheet pile row A is excavated at once, and the inside of the groove is partitioned for each construction section by a removable partition material D, and a necessary amount of filling liquid is provided for each construction section A groove-like filling liquid storage pit B for storing 3 is formed. Other configurations and operations are the same as those of the previous embodiment, and thus description thereof is omitted.

FIG. 9 shows a third embodiment of the present invention. This embodiment is an auxiliary to the filling method described with reference to FIGS. 1 to 8 (a method of filling the filling liquid from the top to the bottom with the filling liquid storage pits B in the voids in the ground caused by drawing out the sheet pile). As a means, there is a feature in that an injection machine E such as a boring machine is used, and a method of injecting and filling the filling liquid from the bottom to the top with the pipe 11 inserted into the ground is used.

More specifically, in the sheet pile drawing portion filling method shown in FIG. 9, a required number of sheet piles 1 are drawn out, a machine installation area is secured on the ground, and an injection machine E such as a boring machine is placed at that position. A method of injecting and filling the filling liquid 3 from the bottom to the top by the pipe 11 installed in the ground, and a filling liquid 3 from the top to the bottom by the grooved (or vertical hole-shaped) filling liquid storage pit B The sheet pile 1 is extracted while being used in combination with the method of filling the. According to this structure, there exists an effect which can be filled rapidly also in the site | part with a large depth.
Since other configurations and operations are the same as those of the previous embodiment, description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Sheet pile 2 Backfill 3 Filling liquid 4 Ground mountain 5 Boundary of site and road 6 Underground pipe 7 Suspension wire 8 Vibro hammer 9 Hose 10 Air reservoir 11 Pipe A Sheet pile row B Filling liquid storage pit C Building D Partition material E Injection machine (boring machine, etc.)

Claims (4)

A method of filling a caulking filling liquid into a void in the ground caused by drawing out a sheet pile, in which a filling liquid storage pit in contact with a sheet pile row is excavated and formed in the ground, and the filling liquid is stored in the pit. A method for filling a sheet pile extraction portion, wherein the sheet pile is sequentially extracted from the sheet pile located in the pit. 2. The sheet pile drawing portion filling method according to claim 1, wherein the filling liquid storage pit is formed in a local vertical hole shape in contact with a part of the sheet pile row. 2. The sheet pile drawing portion filling method according to claim 1, wherein the filling liquid storage pits are formed in a groove shape along the sheet pile row. Using a method of filling the ground gap created by drawing out the sheet pile from the top to the bottom with a filling liquid storage pit and an injection machine such as a boring machine, The sheet pile drawing portion filling method according to any one of claims 1 to 3, wherein the sheet pile is pulled out together with a method of injecting and filling the filling liquid from top to bottom.

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