JP2002138463A - Permeable diaphragm wall and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permeable diaphragm wall and its construction method capable of eliminating a projected part to an outside bedrock side within a range of the application of a land use regulation when it is applied. SOLUTION: The diaphragm wall 10 includes a soil cement column body 12, cores 14 and a permeable section 16. The column body 12 is constituted of preceeding soil cement column bodies 12a and following soil cement column bodies 12b1 to 12b3. The permeable section 16 provides a prescribed permeable function to a column wall equipped with imperviousness, and it includes a cut-off plate 18, a filler layer 20 and a water pipe 22. The cut-off plate 18 is extended over among the cores 14. The filter layer 20 is inserted between the cut-off plate 18 and an outward bedrock A by storing it in a liquid-tight bag body 24 melted by hot water, and then, it is made to foam and expand to form a continuous bubble to provide permeability thereto. An opening on the side of the lower end of the water pipe 22 is connected to the filter layer 20 lying between the cut-off plate 18 and the outward bedrock A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-permeable ground wall and a method for constructing the same, and more particularly to a water-permeable ground wall and a method for constructing the wall which are suitable when there are restrictions on land.

[0002]

2. Description of the Related Art When constructing an underground structure such as a subway or an underground tunnel for a vehicle road by an open-cutting method, a soil with water-blocking properties is required to prevent collapse of the ground and enable excavation inside. A retaining wall is built.

[0003] For this type of earth retaining wall, for example, various structures such as a soil cement column type underground continuous wall and a concrete underground continuous wall are provided. By the way, when such underground continuous water barrier is constructed underground, the groundwater level rises on the upstream side of the underground continuous wall in order to cut off the groundwater vein at the part where the underground continuous wall was constructed, A so-called dam-up phenomenon occurs in which the groundwater level drops on the downstream side.

Therefore, as a measure for solving such a phenomenon, it has been proposed to install a water passage device at a predetermined position of an underground continuous wall to ensure water permeability. For example, Japanese Patent Laid-Open No. 2000-64270 discloses a method. Japanese Patent Laid-Open Publication No. H11-157873 discloses a method of providing water permeability to a soil cement column type underground continuous wall.

In the method disclosed in this publication, a soil cement column having a stress-bearing core material such as H steel is continuously arranged in an excavation hole in the vertical direction of the ground to form a water blocking wall. This is a method for securing water flow in the middle continuous wall, and has a basic configuration in which a water collecting means such as a crushed stone drain is arranged so as to wrap around the water stop wall and the outer ground.

In this construction method, the water collecting means is provided with a water impervious plate inside the adjacent core material, and is provided on the outer side so as to be in contact with the water impervious plate. However, the water passage method having such a configuration has a problem described below.

[0007]

That is, in the water passage method disclosed in the above-mentioned publication, the water collecting means such as a crushed stone drain is disposed so as to wrap around the water stop wall and the outer ground. The water means protrudes more outwardly than the thickness of the soil cement pillars formed in rows.

For this reason, this method cannot be adopted when there is a restriction on the surrounding land. In addition, in the water passage method disclosed in the above-mentioned publication, since water collecting means is provided after the construction of the soil cement column, excavation for the water collecting means is required, and the construction process is complicated, and the labor is complicated. Not only this, but also construction costs increase.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a communication device that does not protrude to the outside ground side than the wall thickness of the underground continuous wall. An object of the present invention is to provide an underground diaphragm wall.

It is another object of the present invention to provide a method for constructing a water-permeable ground wall which can be built without a new excavation step after the ground wall is built.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a soil cement wall obtained by solidifying site soil and soil with a cement slurry, and inserting the soil cement wall into the soil cement before solidification. In the water-permeable underground continuous wall provided with a core material for stress bearing, and a water-permeable portion provided on the outer ground side of the soil cement wall, the water-permeable portion,
Before the solidification of the soil cement wall, a water stop plate provided between the cores, and before the solidification of the soil cement wall, between the water stop plate and the outer ground, It is housed and inserted in a tight bag, after which it is foamed to form open cells to provide water permeability, remove the liquid tight bag, and contact the outer ground. A filter layer and a water pipe having one end communicating with the filter layer are provided. According to the water-permeable underground continuous wall configured as described above, the water-permeable portion is formed before the solidification of the soil cement wall, the water stop plate provided between the core materials, and before the solidification of the soil cement wall. The liquid-tight bag is housed between the water-stop plate and the outer ground, inserted into the liquid-tight bag, and then foamed to form open cells to provide water permeability and to be attached to the liquid-tight bag. Since it has a filter layer that removes the body and contacts the ground outside, and a water pipe that one end side communicates with the filter layer,
The groundwater vein on the side of the ground outside and the filter layer communicate with each other, so that water permeability of the underground continuous wall is ensured. In this case, there is no portion of the water passage that protrudes outward from the outer periphery of the soil cement wall. The liquid-tight bag can be composed of a hot water-soluble sheet that is dissolved by contact with hot water, or a biodegradable plastic sheet that is decomposed by microorganisms such as bacteria and mold in the soil. According to this configuration,
By supplying hot water to the water pipe communicating with the filter layer through the filter layer, the liquid-tight bag can be easily dissolved, and the filter layer and the groundwater vein can be communicated. If a liquid-tight bag is made of a plastic sheet, the sheet will be decomposed by microorganisms such as bacteria and fungi in the soil over time, allowing the filter layer to communicate with the groundwater vein without any action. Can be done.
The water stopping plate may be formed in a corrugated shape having a concave portion provided corresponding to an end overlapping portion of the soil cement wall formed in a column shape. According to this configuration, for the soil cement wall formed in a row having irregularities in the thickness direction, the waveform is matched with the irregularities,
Even when a core material having a large girder height is inserted, it becomes easy to pull the water blocking plate into the soil cement wall. The water pipe may have a lower end fixed to a through hole provided in the water stop plate. According to this configuration, when the water stop plate is pulled into the soil cement wall, the water pipe can be drawn at the same time. The through hole may be provided in the concave portion of the water stop plate, and the water pipe may be fixed to the through hole. According to this configuration, the end overlapping portion of the soil cement wall provided with the concave portion does not have the core material as in the other portions, and only the soil cement exists, and is relatively large. It is a place where a member can be inserted, and such a place can be effectively used for installation of a water pipe. The filter layer can be composed of a two-component continuous foamed rubber material. On the other hand, the present invention relates to a method of constructing an underground continuous wall for forming a soil cement wall in a ground by supplying a cement slurry to an on-site soil and mixing, stirring and solidifying the soil,
A method for constructing a water-permeable underground continuous wall that forms a water-permeable portion on the outer ground side of the soil cement wall while inserting a core material for stress burden before the solidification of the soil cement wall, The water passage section includes a water stop plate, a filter layer, and a water passage pipe.Before the soil cement wall is solidified, the water stop plate is provided between the core members, and the water stop plate is provided. Between the outer ground, the filter layer forming material which is foamed and expanded to form open cells to impart water permeability is inserted and stored in a liquid-tight bag body, and thereafter, the filter layer layer is formed. The material is foamed and expanded to form the filter layer having water permeability, the liquid-tight bag is removed, and the filter layer is brought into contact with the outer ground,
The water pipe having one end communicating with the filter layer was provided. According to the method of constructing a water-permeable underground continuous wall configured as described above, the water-permeable portion includes a water-stop plate, a filter layer, and a water-permeable pipe, and before solidification of the soil cement wall, the core material The filter layer forming material, which is formed by foaming to form open cells to provide water permeability between the water stopping plate and the outer ground, is stored in a liquid-tight bag. Then, the filler layer forming material is expanded and foamed to form a filter layer having water permeability, the liquid-tight bag is removed, and the filter layer is brought into contact with the ground outside, and one end is inserted. Since the side is provided with the water pipe communicating with the filter layer, there is no need to provide a new borehole after the construction of the soil cement wall. In the above construction method, before foaming the filler layer forming material, a stretchable bag is installed between the core material and the inner ground of the soil cement wall, and the filler material is expanded. At this time, a curable liquid such as cement milk can be injected into the elastic bag to expand the elastic bag. According to this configuration, an elastic bag is installed between the core material and the inner ground of the soil cement wall, and when the filler material is foamed, cement milk or the like is contained in the elastic bag. By injecting the curable liquid and expanding the elastic bag, the expanded elastic bag can be used as a reaction force when the filler material is foamed, and the filler layer can be formed. It is possible to prevent the movement of the core material due to the foaming expansion of the material. After solidifying the soil cement wall, the filter layer can be washed through the water pipe. According to this configuration, clogging of the filter layer due to the hardened slurry or the like can be removed by washing at any time before or after use.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 9 show an embodiment of a water-permeable ground wall and a method of constructing the same according to the present invention.

The water-permeable underground continuous wall 10 according to this embodiment
As shown in FIG. 9, the construction completion state is shown in FIG. 9, a plurality of soil cement columns 12 obtained by solidifying the local soil and soil with a cement slurry, and a stress-bearing member inserted and installed in each soil cement column 12. Core material 14 and soil cement column 1
2 and a water passage section 16 provided in the outside ground A.

In this embodiment, in each of the top views such as FIG. 9, the lower side of the soil cement column 12 is an inner ground B to be excavated and excavated. The upper side is the outside ground A which is not excavated.

In the case of the present embodiment, the soil cement column 12 is composed of a pair of preceding soil cement columns 12a already formed at a predetermined interval in the ground, and a space between the preceding soil cement columns 12. And three subsequent soil cement pillars 12b1 to 12b3.

These leading and trailing soil cement pillars 12a, 12b1 to 12b3 are connected and formed in a line so that the ends of the laterally adjacent ones form an overlapped portion C which overlaps each other. Have been.

Each of the soil cement columns 12a, 12b1
12b3 is formed by mixing and stirring with a cement slurry while excavating the soil at the site, and the soil cement columns 12a and 12b formed by solidifying such a mixture.
The column wall composed of 1 to 12b3 is usually provided with water shielding.

In the case of the present embodiment, the core member 14 is made of an H-shaped steel, and each of the soil cement columns 12a, 1
At the center of 2b1 to 12b3, these pillars 12a, 1
2b1 to 12b3 are inserted before solidifying.

The water passage section 16 provides predetermined water permeability to the column walls having water blocking properties. In the case of the present embodiment, the water passage section 18, the filter layer 20, and the water passage section 16 pass through the water passage section 16. And a water pipe 22.

The water blocking plate 18 is inserted and installed in the following soil cement columns 12b1 to 12b3 before the following soil cement columns 12b1 to 12b3 are solidified. 12b1-12b3
Are provided so as to straddle between the core members 14 respectively inserted into the core members 14.

The water stop plate 18 of the present embodiment is
And three flat portions 18a respectively abutting against the flange 14a on the outer ground A side, and a pair of concave portions 18b provided between the flat portions 18a. I have.

The pair of concave portions 18b are formed by overlapping the overlapping portions C formed at the ends of the following soil cement columns 12b1 to 12b3.
And is formed so as to protrude toward the inner ground B side.

The water stop plate 18 having such a configuration has a waveform formed by the flat portion 18a and the concave portion 18b with respect to the column row having the unevenness in the thickness direction formed by the subsequent soil cement columns 12b1 to 12b3. By making the irregularities coincide with each other, even when the core material 14 having a large girder height is used, the water stop plate 18 is connected to the subsequent soil cement columns 12b1 to 12b3.
It can be easily inserted and installed inside.

The filter layer 20 is made of, for example, a continuous foamed rubber material.
Before solidification of b3, it is inserted between the water stop plate 18 and the outer ground A in a liquid-tight bag 24 that is soluble in hot water, and then foamed and expanded to form open cells. And water permeability is provided.

Due to such foaming and expansion, the filter layer 20 is brought into contact with the inner surface of the water stop plate 18 at one end, and is dissolved in warm water to remove the liquid-tight bag 24. The side is brought into direct contact with the outer ground A.

The filter layer 20 can be provided at a depth position such that a part or the whole thereof faces the groundwater vein existing in the ground, or over the entire length of the soil cement columns 12b1 to 12b3.

The method of forming the filter layer 20 is not only to form open cells with the continuous foamed rubber material alone, but also, for example, in combination with urethane foam, a hot water-soluble or biodegradable plastic And dissolve these fibers in warm water, or
The cells may be decomposed and removed by microorganisms to make the closed cells continuous. In addition, the same thing as the thing used for the bag body 24 mentioned later can be used for such a hot water-soluble or biodegradable synthetic resin.

The water pipe 22 has a pipe shape with both ends opened, and as shown in FIG. 5, its lower end is bent in a substantially L-shape. In this embodiment, two water pipes are used. It is composed of

An opening at the lower end of the water pipe 22 is fixed to a through hole 18 c formed through the water blocking plate 18.
It communicates with the filter layer 20 interposed between the water stop plate 18 and the outer ground A.

The through hole 18c of the water stop plate 18 is provided in a concave portion 18b arranged so as to correspond to the overlapping portion C. Therefore, in the case of this embodiment, the water pipe 2
2 is disposed in the end overlapping portion C of the soil cement pillars 12b1 to 12b3. When the water pipe 22 is disposed at such a position, the end overlapping portion C does not have the core material 14 like the other portions, and only the soil cement is present, so that a relatively large member is inserted. Is possible, and such a location can be effectively used for installation of the water pipe 22.

If the water pipe 22 is disposed in the end overlapping portion C, it is easy to increase its diameter.
Inside, a pump can be installed.

Further, the upper end side of the water pipe 22 extends along the longitudinal axis direction of the soil cement columns 12b1 to 12b3.
It extends upward. As in the present embodiment, the water passage 16
When the water pipe 22 having such a configuration is used, the water pipe 22
Since the lower end opening communicates with the filter layer 20 and the upper end side extends upward along the soil cement pillars 12b1 to 12b3, it is necessary to secure water permeability for the groundwater vein below the root cutting excavation depth. Can be.

The installation state of the water pipe 22 is determined along the longitudinal direction of the soil cement columns 12b1 to 12b3.
Instead of extending upward, it may be extended in the horizontal direction as shown by a virtual line in FIG. In this case, the water pipe 2
The end of 2 is closed until excavation of the inside.

On the other hand, between the core material 14 and the inner ground B,
A reaction force receiving portion 26 for foaming and expanding the filter layer 20 is provided. Reaction force receiving portion 26 of the present embodiment
Has a stretchable bag 26a and a hardened body 26b filled and filled in the stretchable bag 26a, both ends of which are in contact with the core material 14 and the inner ground pile B, respectively.

The cured product 26b is, for example, a product obtained by curing mortar or cement milk.
When foaming and expanding 0, these liquids are injected into the elastic bag 26a to expand the elastic bag 26a,
Both ends are brought into contact with the core member 14 and the inner ground B, respectively.

Next, the permeable underground continuous wall 10 having the above structure
Will be described with reference to the accompanying drawings. When constructing the water-permeable underground continuous wall 10, first, the following soil cement columns 12b1 to 12b3 are formed between the preceding soil cement columns 12a, as shown in FIG.

The leading soil cement pillar 12a has a core material 14 inserted therein, and is already solidified.
In the case of this embodiment, the preceding soil cement column 12
Between a, three successive soil cement pillars 12b1 to 12b3 each having an overlapped portion C at the end are formed.

Subsequent soil cement pillars 12b1 to 12b
As shown in FIG. 2, before forming the mixture, the core material 14 is inserted into the soil and the cement slurry by mixing and stirring the soil and the cement, as in the related art. At this time, as shown in FIGS. 4 and 5, a member for forming the water passage section 16 is installed together with the core member 14.

That is, the members forming the water passage section 16 of the present embodiment include the water stop plate 18 and the hot water soluble liquid tight bag 24.
And the water pipe 22 fixed to the water stop plate 18, so that the liquid-tight bag 24 is
In the state where it is locked to the backing soil cement column 12 that has not yet been solidified, for example, using a rope or a wire.
b1 to 12b3.

In this case, the water stop plate 18 is
Since it is formed in a waveform having a concave portion 8a and a concave portion 18b, and this waveform corresponds to the unevenness in the thickness direction of the column, it can be relatively easily drawn into the soil cement columns 12b1 to 12b3.

The water stop plate 18 is provided between the cores 14 such that the flat portions 18a are in contact with the outer surfaces of the flanges 14a on the outer ground A side of the respective cores 14, and the water passage pipes are provided. 2
2 is set so as to be located in the overlapping portion C.

Further, the liquid-tight bag body 24 is
8 is located on the side of the outside mountain A. On the other hand, an elastic bag 26a is inserted and disposed outside of the flange 14b of the inner ground B of each core member 14 so that one end side thereof comes into contact with the flange 14b.

When the member for forming the water passage 16 and the elastic bag 26a are installed, the filter layer forming material is injected into the liquid-tight bag 24 as shown in FIG. This filter layer forming material is, for example, a two-component foamed rubber material. After the main material is injected, by mixing a foaming starting material, foaming and expansion are performed to form open cells, and water permeability is increased. Can be adopted.

The material for forming the filter layer is poured into the liquid-tight bag 24, and foamed and expanded to form the filter layer 2.
0, the bag 24 has one end side of the water blocking plate 1
8, and the other end comes into contact with the outer ground A.

At this time, foaming of the filter layer forming material,
In order to prevent the movement of the core material 14 due to the expansion, a hardening material 26a such as cement milk is injected into the elastic bag body 26a to expand the elastic bag body 26a.
And a reaction force receiving portion 26.

Although the reaction force receiving portion 26 is not always essential, the provision of the reaction force receiving portion 26 can prevent the movement of the core material 14 due to foaming and expansion of the filter layer forming material. Further, the bag body 24 can be strongly pressed against the outer ground A.

The reaction force receiving portion 26 may be configured such that a hardening material 26a is injected before the foaming and expansion of the filter layer forming material to expand the elastic bag 26a.

When the soil cement pillars 12b1 to 12b3 solidify with the passage of time, as shown in FIG. 8, hot water is supplied through the water pipe 22 to dissolve the liquid-tight bag 24, The filter layer 20, which has been expanded and expanded and has open cells, is brought into direct contact with the outer ground A.

For such a hot water-soluble bag 24, a synthetic resin sheet whose dissolving temperature can be selected, for example, SOLBURON (trade name, manufactured by Nichibi Co., Ltd.) can be used.

Then, if necessary, the water pipe 2
The cleaning water or compressed air is sent to the filter layer 20 through the filter 2 to remove the slurry and the like remaining on the outer ground A side, thereby improving the water flow capacity.

The liquid-tight bag 24 shown in this embodiment
It is not always necessary to dissolve in hot water, and for example, those that can be broken and removed by supplying high-pressure water or high-pressure air through the water pipe 22, those that dissolve by chemicals, and those that dissolve in soil Biodegradable plastic sheet decomposed by microorganisms such as bacteria and mold, such as Super Paper (trade name, manufactured by Shin-Etsu Polymer Co., Ltd.), Plastarch (trade name, manufactured by Kuraray Co., Ltd.), Bionole (trade name, manufactured by Showa Kogyo Co., Ltd.) , Product name).

As described above, when the water passage section 16 is provided in the underground continuous wall 10, for example, the underground continuous walls 10 having the same configuration are formed facing each other at a predetermined interval, and the underground continuous walls 10 are formed. 1
In the case of constructing a structure between 0 and 0, the water passages 16 provided on each of the opposing continuous walls 10 are connected to the water passage 2
By connecting the two, the groundwater blocking phenomenon is eliminated.

The underground continuous wall 10 formed in a line is
In this case, if the upper end side of the communication pipe 22 of the water passage section 16 is discharged to the downstream side of the groundwater vein blocked by the continuous wall 10, the groundwater blocking phenomenon is eliminated.

Further, when only the groundwater is to be removed, for example, if a pump is built in the lower end side of the water pipe 22 of the water passage section 16, the water-permeable ground wall 10 is used as a deep well. You can also.

According to the water-permeable underground continuous wall 10 configured as described above, the water-permeable portion 16 has a portion projecting from the outer periphery of the soil cement pillars 12b1 to 12b3 to the outer ground A side. not exist.

Accordingly, when there is a restriction on the surrounding land as in the case of the conventional water-permeable ground wall, the construction is not restricted and the degree of freedom of construction is widened.

Further, according to the method of constructing a water-permeable underground continuous wall constructed in the above steps, the soil cement column 12b1
After the construction of ~ 12b3, excavation or the like for providing a water collecting means becomes unnecessary, and it is possible to reduce labor and construction cost while avoiding complication of the construction process.

In the case of the present embodiment, the filter layer 20 can be washed through the water pipe 22 after the soil cement pillars 12b1 to 12b3 are solidified and formed in rows. Therefore, clogging of the filter layer 20 due to the hardened slurry or the like can be removed by washing before or at any time after use.

In the above-described embodiment, the case where the water passing portion 16 is provided in the subsequent soil cement pillars 12b1 to 12b3 has been exemplified.
It can also be provided on the 2a side.

Further, in the above embodiment, the case where three successive soil cement columns 12b1 to 12b3 are formed between the pair of preceding soil cement columns 12a has been described, but the present invention is not limited to this. The present invention is not limited to this. For example, the present invention can be applied to the case where the soil cement columns are continuously formed in one direction in a row, and the number of the series of soil cement columns is not limited to three. .

Further, in the above embodiment, the case where the present invention is applied to a wall formed of a columnar soil cement column is exemplified. However, the present invention is not limited to this. For example, the present invention can be applied to a case where a soil cement wall having an equal thickness is formed by a trader trench method or the like.

[0062]

As described above in detail, according to the water-permeable underground continuous wall and the method for constructing the same according to the present invention,
The construction can be performed without the need for a new excavation process after the construction, and there is no protruding portion to the outside ground side which is a land restriction at the time of application.

[Brief description of the drawings]

FIG. 1 is an explanatory top view of an initial step of a method for constructing a water-permeable ground wall according to the present invention.

FIG. 2 is an explanatory top view of a step performed subsequently to FIG. 1;

FIG. 3 is an explanatory longitudinal sectional view of a main part of FIG. 2;

FIG. 4 is an explanatory top view of a step performed subsequent to FIG. 2;

5 is an explanatory longitudinal sectional view of a main part of FIG. 4;

FIG. 6 is an explanatory top view of a step performed after FIG. 4;

FIG. 7 is an explanatory longitudinal sectional view of a main part of FIG. 6;

FIG. 8 is an explanatory top view of a step performed after FIG. 6;

FIG. 9 is an explanatory top view showing one embodiment of the water-permeable ground wall according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Water-permeable underground continuous wall 12 Soil cement pillar 12a Leading soil cement pillar 12b1 to 12b3 Trailing soil cement pillar 14 Core 16 Water passing part 18 Waterproof plate 20 Filter layer 22 Water pipe 24 Liquid tight bag 26 Reaction force receiving part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshihiro Tanaka 2-15-2 Konan, Minato-ku, Tokyo F-term of Obayashi Corporation Headquarters F-term (reference) 2D049 EA15 GB05 GC11 GD03 GE03

Claims (9)

[Claims] 1. A soil-cement wall obtained by solidifying earth and sand at a site with a cement slurry, a stress-bearing core material inserted into the soil-cement wall before solidification of the soil-cement wall, A water-permeable underground continuous wall provided with a water-permeable portion provided on the outer ground side, wherein the water-permeable portion is provided between the core materials before the soil cement wall is solidified. And before the solidification of the soil cement wall, inserted between the water blocking plate and the outer ground in a liquid-tight bag, and then foamed to form open cells. And a filter layer that removes the liquid-tight bag and contacts the outer ground, and a water pipe that has one end communicating with the filter layer. Permeable underground continuous wall. 2. The liquid-tight bag may be made of a hot water-soluble sheet that dissolves by contacting with hot water, or a biodegradable plastic sheet that is decomposed by microorganisms such as bacteria and mold in the soil. The permeable underground continuous wall according to claim 1, characterized in that: 3. The water stop plate is formed in a corrugated shape having a concave portion provided corresponding to an end overlap portion of the soil cement wall formed in a column shape. 3. The permeable underground continuous wall according to 1 or 2. 4. The continuous underground water passage according to claim 1, wherein a lower end opening of the water passage pipe is fixed to a through hole provided in the water stop plate. wall. 5. The through hole according to claim 1, wherein the through hole is provided in the concave portion of the water stop plate, and the water pipe is fixed to the through hole. Aqueous underground diaphragm wall. 6. The water-permeable underground continuous wall according to claim 1, wherein the filter layer is made of a two-component continuous foamed rubber material. 7. A method of constructing an underground continuous wall for forming a soil cement wall in a ground where a cement slurry is supplied to a site soil and mixed, stirred and solidified in the ground, wherein a stress is applied before the solidification of the soil cement wall. A method of constructing a water-permeable underground continuous wall for inserting a burden core material and forming a water-permeable portion on the ground side outside the soil cement wall, wherein the water-permeable portion includes a water-stop plate and Including a filter layer and a water pipe, before solidifying the soil cement wall, laying the water blocking plate between the cores, between the water blocking plate and the outer ground, The filter layer forming material to which foaming and expansion are performed to form open cells and water permeability is imparted is stored and inserted in the liquid-tight bag body, and thereafter,
The filler layer forming material is foamed and expanded to form the filter layer having water permeability, the liquid-tight bag is removed, and the filter layer is brought into contact with the outer ground. A method for constructing a water-permeable underground continuous wall, comprising providing the water-permeable pipe communicating with a filter layer. 8. Before the foamer layer forming material is foamed, a stretchable bag is installed between the core material and the inner ground of the soil cement wall to foam the filler material. 8. The method according to claim 7, wherein a hardening liquid such as cement milk is injected into the elastic bag to expand the elastic bag. 9. The construction of a water-permeable underground continuous wall according to claim 7, wherein the filter layer is washed through the water pipe after the soil cement wall is solidified and formed. Method.