JP2000054420A - How to form a water passage in an underground continuous wall - Google Patents

Abstract

(57) [Summary] To prevent interruption of groundwater flow by a simple method. When constructing an underground continuous wall, a bag is filled with water or muddy water and concrete is poured into a hole in a state in which both ends of a water pipe are closed. After completion of the underground structure, the water or muddy water 9 in the bag 7 is drained, the bag 7 and the supply / discharge hose 8 are removed, and the lid 6 is removed.
Then, the jet nozzle 13 is lowered into the water pipe 4 via the connection pipe 5, and the high-pressure washing water is jetted to both sides of the water pipe 4. Finally, the jet nozzle 13 is pulled up, and water is permeated from the connection pipe 5. A method of filling the material 14 into the water pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of forming a water passage in an underground continuous wall.

[0002]

2. Description of the Related Art The underground continuous wall construction method is a construction method in which an underground wall is excavated in a groove shape and concrete is poured into the underground wall to construct an underground wall. During the construction of the underground structure, the underground wall functions as a retaining wall for preventing the collapse of the surrounding earth and sand, and also functions as a water blocking wall. However,
This underground wall often remains after the underground structure is completed,
In that case, the flow of groundwater is interrupted, and the water level on the upstream side of the groundwater rises and the water level on the downstream side drops, which has a problem of adversely affecting the environment and ecosystem.

[0003] In order to solve this problem, a technique of forming a water passage portion in an underground continuous wall has been proposed in Japanese Patent Application Laid-Open Nos. 7-76827 and 7-76828.

[0004]

However, the above-mentioned conventional method of forming a water passage portion in an underground continuous wall involves crushing a part of the underground continuous wall by jetting high-pressure water with a jet nozzle. Therefore, there is a drawback that the device becomes overwhelming.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a method of forming a water passage section in an underground continuous wall which can prevent interruption of groundwater flow by a simple method. With the goal.

[0006]

For this purpose, a method of forming a water passage in an underground continuous wall according to the present invention comprises the steps of inserting a rebar cage 3 into a groove or hole 2 excavated in the ground 1, In the method of constructing the underground continuous wall 10 by casting concrete,
The rebar cage 3 has a water pipe 4 fixed at a predetermined position.
A connection pipe 5 for communicating the water pipe 4 with the ground, a lid 6 provided at both ends of the water pipe 4 so as to be openable and closable, and a bag body 7 provided inside the water pipe 4. When the underground continuous wall is constructed, the bag 7 is filled with water or muddy water 9 and the cover 6 is provided.
Concrete is poured into the hole 2 with both ends of the water pipe 4 closed, and after completion of the underground structure, water or muddy water 9 in the bag 7 is drained, and the bag 7 and the supply / drain hose 8 are drained. Is removed and the lid 6 is lowered, and then the jet nozzle 13 is lowered into the water pipe 4 via the connection pipe 5, and high-pressure washing water is injected to both sides of the water pipe 4, and finally, the jet nozzle 13 is It is characterized in that the water permeable material 14 is filled into the water pipe 4 from the connection pipe 5 by being pulled up. It should be noted that the numbers added to the above configuration are compared with the drawings to facilitate understanding of the present invention, and the present invention is not limited thereto.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating an embodiment of a method for forming a water passage portion in an underground continuous wall according to the present invention and illustrating a construction method.

FIG. 1A shows a state in which a groove or hole 2 is excavated in the ground 1 and a reinforcing cage 3 is inserted and arranged.
A water pipe 4 is fixed to a predetermined portion of the reinforcing bar 3, and a connection pipe 5 for communicating the ground with the water pipe 4 is provided above the water pipe 4.
Are connected, and rotatable lids 6 are disposed at both ends of the water pipe 4. A flexible bag 7 is provided inside the water pipe 4, and the bag 7 is connected to the ground via a supply / discharge hose 8 arranged in the connection pipe 5. Bag 7
The inside is filled with water or muddy water 9, whereby the lid 6 closes both ends of the water pipe 4 so as to stop the discharge of groundwater during use as a retaining wall. Then, concrete is poured into the hole 2 to construct the underground continuous wall 10.

After completion of the underground structure, the water or mud 9 in the bag 7 is drained, and the bag 7 and the supply / discharge hose 8 are removed, as shown in FIG. 1B. A wire 11 is connected to the upper end of the lid 6, and the wire 11 is connected to the ground via a roller 12 provided below the water pipe 4. Therefore, when the wire 11 is pulled upward, the lid 6 is fallen to the bottom of the water pipe 4 as shown by the arrow in the figure.

Next, as shown in FIG. 1 (C), the jet nozzle 13 is lowered into the water pipe 4 through the connection pipe 5 and high-pressure washing water is injected to both sides of the water pipe 4. The mud cake (concrete and part of the ground) on both sides is crushed and washed. Finally, the jet nozzle 13
As shown in FIG. 1 (D), a water permeable material 14 such as gravel or crushed stone is filled into the water pipe 4 from the connection pipe 5.

FIG. 2 shows the underground continuous wall 10 formed as described above. As shown by the arrow in the drawing, the groundwater flows through the water pipe 4, so that the flow of the groundwater is not interrupted. . In addition, 15 is an underground structure constructed between the underground continuous walls 10.

Further, in the present invention, when the water permeable material 14 is clogged, the water permeable material 14 is removed from the connection pipe 5 by an air lift, the inside of the water flow pipe 4 is washed by the jet nozzle 13, and then the connection pipe 5 is reconnected. By filling the water-permeable material 14 into the water pipe 4, maintenance of the water-flow function in the water pipe 4 becomes possible.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, in the above embodiment, the lid 6 is tilted by the wire 11, but the lid 6
May be temporarily fixed to the bag 7, and the bag 6 may be removed by removing it.

[0014]

As is apparent from the above description, according to the present invention, it is possible to prevent the flow of groundwater from being interrupted by a simple method.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a method of forming a water passage section in an underground continuous wall according to the present invention and illustrating a construction method.

FIG. 2 is a sectional view showing an underground continuous wall constructed according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Underground 2 ... Groove or hole 3 ... Reinforcing cage 4 ... Water pipe 5 ... Connecting pipe 6 ... Lid 7 ... Bag 8 ... Supply / discharge hose 9 ... Water or muddy water 10 ... Underground continuous wall 13 ... Jet nozzle 14 … Water permeable material

Claims (1)

[Claims] 1. A method of constructing an underground continuous wall by placing a reinforcing bar in a trench or hole excavated in the ground and then pouring concrete, wherein the reinforcing bar is fixed to a predetermined location. A water pipe, a connection pipe for communicating the water pipe with the ground, a lid disposed at both ends of the water pipe so as to be openable and closable, a bag disposed inside the water pipe, and the bag When the underground continuous wall is constructed, water or muddy water is filled in the bag body and concrete is inserted in the hole with the lid closed at both ends of the water pipe. After completion of the underground structure, drain the water or muddy water inside the bag, remove the bag and the supply / drainage hose, lay down the lid, and then jet the water through the connection pipe into the water pipe. Lower the nozzle and inject high-pressure washing water to both sides of the water pipe. Pulling Le, a method of forming a water passage section in underground continuous wall, characterized by filling the permeable material in the water passing tube from the connecting pipe.