JPH08284154A - Construction method of continuous underground wall - Google Patents

Abstract

PURPOSE: To securely install a continuous underground wall, by fixing a water feed device which is extensible by a spring to a vertical member erected in the continuous underground wall made of soil segment and pushing the device by the spring force to form a water passage before the coil cement is cured. CONSTITUTION: A water feed device 20 in which filter materials 24 are fixed to both ends of a double-tube 21, 22 extending or contracting by the force of a coil spring 23, is fixed in a hole 12 bored on the flange 11 of a vertical member made of a H-shaped steel material or the like through a stopper plate 30. The devices 20 are fitted in multiple stages according to the position and quantity of underground water. The vertical members 10a are driven at every specified distance before cure of the continuous underground footing (soil cement wall) which is constructed by agitating and mixing a curing agent with soil at site and the stopper plate 30 is drawn and the water feed device 20 is pushed in the soil cement by the spring 23 force to form a passage for underground water. In this way, underground water cut off by the continuous underground wall can be easily conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a continuous underground wall having a groundwater permeable channel.

[0002]

2. Description of the Related Art Generally, underground walls are required to have high water impermeability.
Various new methods have been proposed to obtain an underground wall having excellent water-impermeable properties not only in the body of the wall but also in the joint. On the other hand, when the underground wall is constructed across the groundwater channel, the following adverse effects due to the division of the groundwater flow due to the imperviousness of the underground wall have been pointed out. For example, on the upstream side of the groundwater flow across the underground wall, problems such as groundwater spouting and inundation due to rising groundwater level or swamping of the vegetation environment occur, and on the downstream side the wells die and the groundwater level rises. There are problems such as ground subsidence due to deterioration, water rot and vegetation environment drying. Therefore, in order to give water permeability to a part of the continuous underground wall, H that was placed as a stress material after backfilling was completed.
A method has been proposed in which a space between shaped steels is bored by an auger excavator or the like, and a water passage is constructed at the excavation mark.

[0003]

Problems to be Solved by the Invention The conventional techniques for constructing a water permeable channel described above have the following problems. Since the water passage is formed over the entire length in the depth direction of the underground wall, it is impossible to construct the water passage only in the water permeable layer in the ground. When the stress material is densely arranged, it is not possible to make a hole for constructing a water permeable channel. Due to the strength difference between the wall and the surrounding ground, the auger tends to be biased toward the soft surrounding ground, which makes it difficult to drill holes across both sides of the wall. Hole walls of surrounding ground exposed by drilling are likely to collapse.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a continuous underground wall having a groundwater permeation function in a part of the underground wall. It is to provide a construction method.

[0005]

[Means for Solving the Problems] The present invention relates to a continuous underground wall constructed by stirring and mixing a solidifying material with local earth and sand.
An expandable double pipe is installed in the transverse direction of the uncured underground wall, and the double pipe is extended to form a continuous water passage in the transverse direction of the underground wall. It is a method of constructing a continuous underground wall. On the continuous underground wall constructed by stirring and mixing the solidified material with the local earth and sand, double pipes that extend outward due to spring force are installed on the vertical members, and both ends of the double pipes are closed vertically. The material is built into the uncured underground wall, and the double pipe is extended at the position of the permeable layer to form a continuous water passage in the transverse direction of the underground wall. It is a construction method. In addition, on a continuous underground wall constructed by stirring and mixing the solidified material with the local earth and sand, a double pipe with a filter material that expands outward due to the spring force is installed in the vertical material, and both ends of the double pipe are A vertical member is built into the uncured underground wall while being closed, and the double pipe is extended at the position of the permeable layer to form a continuous water passage in the transverse direction of the underground wall. It is a method of constructing an underground wall. Furthermore, in any one of the above-mentioned continuous underground wall construction methods, the continuous underground wall construction method is characterized in that double pipes are formed at a plurality of positions of a vertical member. Further, in the method for constructing a continuous underground wall described above, the continuous tube is constructed by penetrating an inner pipe forming a double pipe through a hole provided in an opposing flange of a vertical member to extend. Is the way. Furthermore, in any one of the methods for constructing a continuous underground wall described above, the vertical member doubles as a stress material for the underground wall, which is a method for constructing a continuous underground wall. Furthermore, in the method for constructing any of the continuous underground walls described above, characterized in that the extension of the double pipe is performed by a sliding operation of a plate body provided on a vertical member,
It is a method of constructing a continuous underground wall.

[0006]

[Embodiment 1] First, the equipment used in the method for constructing a continuous underground wall of the present invention will be described with reference to FIGS. <a> Continuous underground wall Figure 1 shows a perspective view of the underground wall in the uncured state constructed by stirring and mixing the solidifying material with the local soil. In the figure,
Reference numeral 10 is a stress material such as H steel, which is built in the uncured underground wall at a constant pitch as described later. The water-permeable device 20 that imparts water permeability to a part of the underground wall is a vertical member 10 that also serves as a stress material.
To be equipped with.

<B> Water-permeable structure FIG. 2 shows an enlarged view of the water-permeable device. Holes 12 and 12 are formed in the plate surfaces of the flanges 11 and 11 facing each other of the vertical member 10, and guide grooves 13 and 13 are formed at both ends of the outer surfaces of the flanges 11 and 11, respectively. 13,
The holes 12, 12 can be opened / closed by an operation (slide) of the plate bodies 30, 30 fitted in 13 from the ground. An outer tube 21 is arranged between the pair of holes 12 facing each other. A spring member 23 is provided inside the outer tube 21.
And inner pipes 22, 22 arranged on both sides of the spring member 23 and filter members 24 arranged on the outer sides of the inner pipes 22, 22,
24 and 24 are accommodated so that they can enter and leave freely. The outer pipe 21 and the inner pipes 22, 22 constitute a double pipe that can be expanded. The water permeation device 20 appropriately sets the number of installations on the vertical member, etc., according to conditions such as the amount of ground water and the width of the ground water channel.

Outer Tube The outer tube 21 is a tube body with both ends open, and the opposing holes 12, 12 formed between the flanges 11, 11 of the vertical member 10.
It is a pipe body that is attached to match. The outer pipe 21 is a pipe body having the same inner diameter as the holes 12, 12 of the vertical member 10 and forming a part of a groundwater passage.

Inner Pipe The inner pipes 22 and 22 are open-ended pipe bodies for substantially extending the entire length of the outer pipe 21 and forming a part of a groundwater passage. The entire surface of the inner pipes 22 and 22 is continuous between the outer pipe 21 and the filter materials 24 and 24 when the filter materials 24 and 24 contact the ground by projecting outward from the end portion of the outer pipe 21. The dimensions are set so that a water passage can be formed.

Filter Material The filter material 24 is a member that blocks intrusion of earth and sand and solidifying material into the water passage and allows only water to enter, and widely known members can be used as constituent materials. As an example, it is possible to use steel or synthetic resin. When using a steel material, the filter material 24 is formed into a thin mesh shape,
When a synthetic resin is used, the filter material 24 is formed in the shape of a sponge.

Spring Material The spring material 23 includes the inner tubes 22, 22 and the filter material 24,
It is a coil spring that urges 24 in a direction to push it outward, and is housed in the outer tube 21 in a contracted state.

<D> Plate The plate 30 is composed of the filter members 24, 24 and the inner tubes 22, 2.
It is a plate body that restrains the protrusion of 2. In this embodiment, a case where a plate body having a length extending from the position where the hole 12 is formed to the upper end of the stress material 10a is used will be described.
The part that covers 2 may be formed of a plate, and a rod may be connected to the upper part of the plate.

[0013]

Next, a method of constructing a continuous underground wall will be described with reference to FIGS. <a> Confirmation of groundwater level In constructing the continuous underground wall 40, first, the preceding boring or the like is performed to grasp the position of the groundwater level 50 in the ground.

<B> Stirring and mixing of solidifying material An auger excavator or the like is used to stir and mix the earth and sand and the solidifying material while discharging the solidifying material from the tip of the auger to sequentially construct the pillar-shaped underground wall 40. . Next, the uncured underground wall 40
The vertical members 10 are built at regular intervals.

<C> Set of water-permeable device Vertical member 1 with water-permeable device 20 installed according to groundwater level 50
0a penetrates into the uncured underground wall 40. Water permeation device 2
0 is a plate body 30 for closing the holes 12, 12 of the vertical member 10a,
The entry of the solidifying material and earth and sand is prevented by 30.

<D> Slide of Plate After the vertical member 10a is built up to a predetermined depth, the plates 30, 30 are pulled out and removed before the solidifying material in the soil is solidified. By removing the plate members 30 and 30, the water permeation device 20
The respective filter materials 24, 24 and the inner tubes 22, 22 of the vertical member 10 are pushed out by the pushing force of the spring member 23 to the outside of the respective holes 12, 12 of the vertical member 10, and further the kneaded body of the uncured solidified material and the sand is pushed away. The filter materials 24, 24 are pushed outward until they are pressed against the ground. As a result, a continuous water passage is formed by the double pipe of the outer pipe 21 and the inner pipes 22, 22 in the transverse direction of the body of the underground wall 40. Underground wall 40
Ground water blocked by the filter material 24, 2
4, the inner pipes 22 and 22, and the outer pipe 21 pass through the water passage.

[0017]

[Embodiment 2] The water permeable device may be provided on the vertical member in multiple stages, which is effective when there are a plurality of water permeable layers or when the amount of water in one water permeable layer is large.

[0018]

Since the present invention is as described above, the following effects can be obtained. <B> It is possible to construct a permeable channel only in the permeable layer in the ground. <B> Since the excavation is not performed from the upper part of the continuous underground wall in the depth direction, it is possible to secure the water permeable passage even when the H-shaped steel, which is a stress material, is densely arranged. <C> Compared with the method of constructing a water-permeable channel by excavation,
It is possible to reliably build a water passage. <D> By recovering the blocked groundwater, it is possible to restore the surrounding environment changed by the construction in a short period of time.

[Brief description of drawings]

FIG. 1 is an explanatory view of a construction example of a method for permeating a continuous underground wall according to the present invention.

FIG. 2 is an explanatory view of a water permeation device used for a water permeation method for a continuous underground wall.

FIG. 3 is a cross-sectional view of a continuous underground wall equipped with a water permeation device.

FIG. 4 is an explanatory diagram after the completion of the placement of the water passage.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Saito 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (7)

[Claims] 1. A continuous underground wall constructed by agitating and mixing a solidifying material with local earth and sand, and an expandable double pipe is installed in a transverse direction of the uncured underground wall. A method for constructing a continuous underground wall, which comprises stretching to form a continuous water passage in the transverse direction of the underground wall. 2. In a continuous underground wall constructed by stirring and mixing solidified material with local earth and sand, a double pipe extending outward by spring force is installed in a vertical member, and both ends of the double pipe are closed. A vertical member is built into the uncured underground wall as it is, and the double pipe is extended at the position of the permeable layer to form a continuous water passage in the transverse direction of the underground wall. How to build the inner wall. 3. In a continuous underground wall constructed by agitating and mixing a solidifying material with local earth and sand, a double pipe with a filter material that expands outward due to a spring force is installed in a vertical member to form a double pipe. A vertical member is built into an uncured underground wall with both ends closed, and the double pipe is extended at the position of the permeable layer to form a continuous water passage in the transverse direction of the underground wall. How to build a continuous underground wall. 4. The method for constructing a continuous underground wall according to claim 2, wherein the double pipes are formed at a plurality of positions on the vertical member. . 5. The method for constructing a continuous underground wall according to claim 4, wherein the inner pipe forming the double pipe is penetrated through the holes provided in the opposite flanges of the vertical member to extend. 6. The method for constructing a continuous underground wall according to claim 2, wherein the vertical member doubles as a stress material for the underground wall. . 7. The method for constructing a continuous underground wall according to any one of claims 2 to 6, characterized in that the extension of the double pipe is performed by a sliding operation of a plate body provided on a vertical member.
How to build a continuous underground wall.