JPH07138939A - Construction method for continuous underground wall and continuous underground wall - Google Patents

Abstract

PURPOSE:To enable underground water to be permeable. CONSTITUTION:A sheet 11 is laid out to both wall surfaces of an excavation ditch 20 where an inlet pipe 12 is mounted to the sheet 11. The inlet pipe 12 is connected to a transparent water hose 13 which may be bent or expansible. When concrete is filled up between the sheets 11, the transparent water hose 13 may extend so that the sheet 11 may come in contact with the wall surface of the excavation ditch 20. As a result, underground water may flow from one wall surface of the continuous wall to the other surface by way of the inlet pipe 12 and the transparent water hose 13.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a continuous underground wall constructed in a trench.

[0002]

2. Description of the Related Art Conventionally, a continuous underground wall has been constructed by filling an excavation trench with concrete.

[0003]

However, the conventional method has the following problems. <B> The underground water flow path is blocked by the continuous underground wall, hindering the flow of groundwater, and there is a problem that groundwater fountains occur on the upstream side and wells die on the downstream side. <B> On the downstream side, there was a problem of ground subsidence due to the drop in water level. <C> There was a problem that changes in the ecosystem would occur due to the decline in groundwater level.

[0004]

An object of the present invention is to provide a method for constructing a continuous underground wall through which groundwater can pass and a continuous underground wall.

[0005]

SUMMARY OF THE INVENTION The present invention is a method for constructing a continuous underground wall in an excavation trench, in which a flexible sheet having a mouth pipe attached is arranged facing the wall face of the excavation trench. A curved or expandable water-permeable hose is connected to both of the mouth pipes corresponding to the opposite wall surfaces of the excavation groove, concrete is filled between the opposed sheets, and the sheet is brought into contact with the wall surface of the excavation groove. Flowing from one wall surface to the other wall surface through the mouth pipe and the water-permeable hose, or a method for constructing a continuous underground wall, or in a continuous underground wall constructed in an excavation trench, the continuous underground wall A flexible sheet disposed on both sides of the wall, a mouth pipe attached to the sheet, and a bendable or stretchable water-permeable pipe connecting the mouth pipes attached to the sheets on both sides of the continuous underground wall. A hose is provided to supply groundwater to one of the continuous underground walls. In underground diaphragm walls, characterized in that flow from the surface to the other wall through the mouth source tube and the transparent water tube.

[0006]

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

<B> Outline of Construction of Continuous Underground Wall The excavation groove 20 is excavated in the ground to construct the continuous underground wall 10,
When the structure 22 is built in the ground surrounded by the continuous underground wall 10, the flow of groundwater is blocked by the continuous underground wall 10. Therefore, as shown in FIGS. 1 and 2, a passage through which groundwater can pass is formed inside the continuous underground wall. for that reason,
A flexible sheet 11 is attached to the wall surface of the excavation groove 20, and concrete is filled between the sheets to construct the continuous underground wall 10. A mouth pipe 12 for passing ground water is attached to this sheet 11, and ground water is allowed to flow from one surface of the continuous underground wall 10 to the other surface through the mouth pipe 12. When constructing a continuous underground wall, the sheets 11 on both side wall surfaces of the excavation groove 20 have a larger gap, so the mouth pipe 12 is connected to a curved or expandable water-permeable hose 13 to follow the enlargement of the gap between the sheets. It can be so. With this configuration, the groundwater flowing out from the one wall surface of the excavation trench 20 is prevented from flowing into the mouth pipe 1 of the one sheet 11.
2, through the water-permeable hose 13 and the mouth tube 12 of the other sheet 11 to the other wall surface.

<B> Sheet The sheet 11 is a flexible sheet-like material, and has the excavation groove 20.
When placed on the wall of the building and filled with concrete,
As shown in (b), it is brought into contact with the wall surface. The seat 11 can be arranged in the digging groove 20 by, for example, building the rebar cage 14 with the sheet in the digging groove 20.

<C> Mouth pipe Mouth pipe 12 is attached to seat 11 and is for passing ground water blocked by seat 11. The seat mounting position of the mouth pipe 12 is the permeable layer 2 through which groundwater in the formation passes.
When it is arranged at the position corresponding to 1, the groundwater can easily flow to the spout pipe 12. The number of mouth pipes 12 can be determined according to the amount of groundwater.

<D> Water-permeable hose The water-permeable hose 13 is a flexible, ie, bendable or expandable / contractible hose, which is connected to the mouth pipe 12 at both ends and is embedded in the continuous underground wall 10 together with the mouth pipe 12. It is something. With this configuration, groundwater generated on one wall surface of the continuous underground wall 10 enters from the mouth pipe 12, passes through the water-permeable hose 13,
It is discharged from the mouth pipe 12 on the other wall surface. Water-permeable hose 1
3, since the water-permeable hose 13 can be curved or expanded and contracted,
At the time of installation, for example, the vicinity of the middle part is attached to the rebar cage 14, and it is arranged so as to be embedded at a predetermined position while suppressing the rise due to the buoyancy at the time of placing concrete. Moreover,
When constructing the continuous underground wall 10, the sheets 1 on both sides of the rebar cage 14
Even if 1 expands the gap, the water-permeable hose 13 extends, the mouth pipe 12 contacts the excavation surface, and the expansion can be followed. If the water-permeable hose 13 is bendable or expandable,
The shape may be a bellows. However, the water-permeable hose 13 does not collapse even under the pressure of concrete, and it is necessary for groundwater to flow inside the hose.

<E> Water Stopper In order to temporarily block the outflow of groundwater, a water stop 15 is attached to the mouth pipe 12. The mouth pipe 12 to which the water stop 15 is attached is arranged on the ground side to be excavated to construct the structure 22. As the water stop tool 15, for example, a water stop valve or a water stop plate is used. When the continuous underground wall 10 is constructed, a water stop valve, a water stop plate, etc. are installed, and after constructing the structure 22 in the area surrounded by the continuous underground wall 10, the water stop valve is opened or stopped. Secure the groundwater flow path by removing the water plate.

<F> Water-permeable material The water-permeable material 17 is, as shown in FIG. 4, the mouth tube 12 and the water-permeable hose 1.
It is placed inside 3 to prevent intrusion of dirt and sand. For example, an artificial water-permeable mat can be used.

A method of constructing a continuous underground wall will be described below.

<A> Construction of continuous underground wall A sheet 11, a mouth pipe 12, and a water-permeable hose 13 are attached to a rebar cage 14.
Etc. The water permeable hose is arranged in a curved state or a contracted state. When constructing a temporary water blocking wall that does not use the reinforcing rod basket 14, a steel frame or the like is incorporated and the seat 11, the mouth pipe 12, the water-permeable hose 13 and the like are attached.
When the reinforcing bar cage 14 is placed in the excavation groove 20 and concrete is filled, the sheet 11 is brought into contact with the excavation groove 20, and the mouth pipe 12 moves to the excavation surface following the movement of the sheet 11. At that time, the water-permeable hose 13 extends and is embedded in a predetermined continuous underground wall.

<B> Installation of connecting pipe When excavating the area surrounded by the continuous underground wall 10 and constructing the structure 22 in the ground, the water stop 15 of the mouth pipe 12 is closed. When constructing the structure 22, the spout pipe 12 between the continuous underground walls is connected by the connecting pipe 16 for flowing groundwater. Even if the connecting pipe 16 is arranged inside the structure 22,
You may arrange | position outside of 2. When connecting the connecting pipe 16, the water stop 15 is opened to form a passage for groundwater.

[0016]

According to the present invention, the following effects can be obtained. <A> Since the water permeable hose can be arranged at a predetermined position of the seat, it can be aligned with the position where the water permeable layer 21 of the ground exists.
As a result, a groundwater permeation passage can be easily formed in the continuous underground wall. <B> Since the water-permeable hose can be arranged in consideration of the strength of the continuous underground wall, it does not affect the strength of the continuous underground wall. <C> It is possible to arbitrarily set the amount of groundwater to be permeable by the size of the permeable hose and the number of permeable hoses to be installed. <D> Since the water-permeable hose can be curved or expanded and contracted, when the continuous underground wall is constructed, even if the sheets 11 on both sides of the reinforcing bar cage expand the gap, they extend and the mouth pipe comes into contact with the excavation surface, This expansion can be followed.

[Brief description of drawings]

FIG. 1 Usage diagram of a continuous underground wall with a water-permeable hose

[Fig. 2] Another usage diagram of a continuous underground wall having a water permeable hose.

[Fig.3] Construction drawing of continuous underground wall with water-permeable hose

[Figure 4] Layout of bag and water-permeable hose

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Yokoyama 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Fumio Sato 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Construction Co., Ltd.

Claims (4)

[Claims] 1. A method of constructing a continuous underground wall in an excavation trench, wherein a flexible sheet having a mouth pipe attached thereto is disposed so as to face the wall face of the excavation trench, and the flexible sheet corresponds to the opposing wall faces of the excavation trench. A curved or expandable water-permeable hose is connected to both of the mouth pipes, concrete is filled between the opposing sheets, the sheets are brought into contact with the wall surface of the excavation trench, and groundwater is supplied from one wall surface to the mouth pipe and A method of constructing a continuous underground wall, which comprises flowing the water through the water permeable hose to the other wall. 2. A method for constructing a continuous underground wall in an excavation trench, wherein a flexible sheet having a mouth pipe attached to the wall face of the excavation trench is arranged to correspond to the opposing wall faces of the excavation trench. A curved or expandable water-permeable hose is connected to both of the mouth pipes, the middle of the water-permeable hose is pulled from below to counteract the buoyancy caused by the concrete filling, and concrete is filled between the facing sheets, and the sheet is A method of constructing a continuous underground wall, which is in contact with a wall surface of the excavation trench and flows groundwater from one wall surface to the other wall surface through the mouth pipe and the water permeable hose. 3. A method for constructing a continuous underground wall having a rebar cage in an excavation trench, wherein flexible sheets having mouth pipes are attached to both sides of the rebar cage, and the rebar cage can be curved or stretched. Attaching the middle of a transparent water hose, the mouth pipes on both sides of the rebar cage are connected via the water permeable hose, the rebar cage is placed in the excavation groove, concrete is filled between the facing sheets, and the sheet is A method of constructing a continuous underground wall, which is in contact with a wall surface of the excavation trench and flows groundwater from one wall surface to the other wall surface through the mouth pipe and the water permeable hose. 4. A continuous underground wall constructed in an excavation trench, wherein flexible sheets arranged on both sides of the continuous underground wall, mouth pipes attached to the sheet, and the continuous underground wall. A curved or expandable water-permeable hose that connects the mouth pipes attached to the sheets on both sides of, and groundwater from one wall surface of the continuous underground wall to the other wall surface through the mouth pipe and the water permeability pipe. A continuous underground wall characterized by flowing.