JP2002138464A - 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 preceedomg 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 equipment with imperviousness, and it includes a cut-off plate 18, a filter layer 20 and a water pipe 22. The cut-off plate 18 is extended over among the cores 14. The filter layer 20 fills the inside of a space 21 with a granulated solid, and gaps formed among solids are in a continuous state to ensure the permeability. 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 blocking plate provided between the cores, and before the solidification of the soil cement wall, inserted between the water blocking plate and the outer ground. A fluid layer is filled and expanded by injecting a fluid into the bag body, and after removing the fluid and the bag body after solidification of the soil cement wall, a filter layer filled with a particulate solid material, and one end side of the filter layer is filled with the filter layer. And a water pipe communicating with the water supply pipe. 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.
Before the solidification of the soil-cement wall body and the water-ceiling plate provided between the core materials, the fluid is injected into the bag inserted between the water-stop plate and the outer ground to expand and inflate. A filter layer filled with granular solids in the space from which the fluid and the bag have been removed after solidification of the soil cement wall,
Since the one end side is provided with a water pipe communicating with the filter layer, if the groundwater vein on the outer ground side and the filter layer communicate with each other, 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 warm water to the water pipe communicating with the filter layer via the filter layer, the liquid-tight bag can be easily dissolved, and the filter layer and the groundwater vein can be communicated. In addition, if a liquid-tight bag is made of a biodegradable plastic sheet, the sheet will be decomposed by microorganisms such as bacteria and mold in the soil over time. And the groundwater vein can be communicated. 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, even when a core material having a large girder height is inserted, the waveform is made to match the unevenness of the soil cement wall formed in a row having irregularities in the thickness direction even when the core material is inserted. Into the soil cement column. 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. 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 on-site soil and mixing, agitating and solidifying the soil cement, and before solidifying the soil cement wall, A method of constructing a water-permeable underground continuous wall that inserts a stress-carrying core material and forms a water-permeable portion on the outer ground side of the soil cement wall, wherein the water-permeable portion includes a water-stop plate. And a filter layer, a water pipe, and before the solidification of the soil cement wall, the water stop plate is provided between the core materials, and before the solidification of the soil cement wall, the water stop plate And a bag body is inserted between the outer ground and the ground, a fluid whose viscosity can be changed is injected into the bag body to expand and expand, and after the soil cement column is solidified, the fluid and the bag body are removed. In the removed space,
The filter layer was formed by filling a granular solid material, and 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 column,
A water stop plate is provided between the core materials, and before the solidification of the soil cement column, a bag is inserted between the water stop plate and the outer ground, and the viscosity can be changed in the bag. A fluid pipe is formed by injecting a fluid to expand and expand, filling a solid portion of the soil cement column from which the fluid and the bag have been removed with a particulate solid material to form a filter layer, one end of which communicates with the filter layer. Therefore, if the groundwater vein on the outer ground side and the filter layer communicate with each other, the water permeability of the underground continuous wall is secured, and it is not necessary to provide a new excavation hole after the construction of the soil cement column. In the above construction method, before expanding the filler layer forming material, a stretchable bag is installed between the core material and the inner ground of the soil cement wall to expand the filler layer forming material. 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, a stretchable bag is installed between the core material and the inner ground of the soil cement wall, and when the filler material is expanded, cement milk or the like is contained in the stretchable bag. By injecting the curable liquid and expanding the elastic bag, the expanded elastic bag can be used as a reaction force when expanding the filler material and forming the filler layer. The movement of the core material accompanying the expansion and expansion of the material can be prevented. In the above construction method, the fluid whose viscosity can be changed is:
It is composed of a mixture of a liquid mainly composed of vegetable fibers and a liquid mainly composed of inorganic minerals. When the fluid is removed, the viscosity can be reduced by injecting a viscosity reducing agent into the mixture. The use of such a fluid facilitates this by reducing the viscosity when removing. Further, in the above construction method, after the soil cement wall is solidified, 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 FIGS. 8 and 9, the construction completion state is shown by a plurality of soil cement columns 12 obtained by solidifying the soil at the site with cement slurry, and the stress load inserted and installed in each soil cement column 12. And a water passage portion 16 provided on the outside ground A of the soil cement column 12.

In this embodiment, in each of the top views such as FIG. 8, the lower side of the soil cement column 12 is an inner ground B to be cut 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 matching or corresponding to this unevenness, even when the core material 14 having a large girder height is used, the water stop plate 18 can be connected to the subsequent soil cement column 12b.
It can be easily inserted and installed in 1 to 12b3.

The filter layer 20 is, for example, filled with solid particles such as crushed stones and glass lumps in the space portion 21, and the gaps formed between the solids are continuous. Is secured.

Before the solidification of the soil cement columns 12b1 to 12b3, the space 21 in this case is
Liquid-tight bag 24 which is dissolved in warm water between
After that, a fluid 25 whose viscosity can be changed is injected into the bag body 24 to expand and expand the bag body 24. After the soil cement columns 12b1 to 12b3 are solidified, the fluid 25 is It is formed by removing the bag 24.

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

The bag 24 is not necessarily limited to this configuration. For example, the bag 24 may be formed of a biodegradable plastic sheet decomposed by microorganisms such as bacteria and mold in the soil, for example, a super paper ( Shin-Etsu Polymer Co., Ltd., trade name), Plastarch (Kuraray Co., Ltd.,
(Trade name) and Bionore (trade name, manufactured by Showa High Polymer Co., Ltd.).

If the bag 24 is formed of a biodegradable plastic sheet to form a liquid-tight bag, the sheet is decomposed by microorganisms such as bacteria and fungi in the soil over time. The bag 24 can also be removed.

When the space 21 is formed in such a manner, when the bag 24 expands and expands due to the injection of the fluid 25, both ends of the bag 24 contact both the water stop plate 18 and the outer ground A. Since the filter layer 20 is in contact with the filter layer 20, one end side of the filter layer 20 contacts the inner surface of the water stop plate 18,
The other end is brought into direct contact with the outer ground A.

The filter layer 20 having such a structure is provided at a depth position where a part or all of the filter layer 20 faces a groundwater vein existing in the ground, or the soil cement pillars 12b1 to 12b.
It can be provided over the entire length of b3.

The water pipe 22 is in the form of a pipe with both ends open, and as shown in FIGS. 5 and 9, its lower end is bent in a substantially L-shape. , 2
It is composed of books.

The lower end side opening of the water pipe 22 is fixed to a through hole 18 c formed through the water stop 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 at the end overlapping portion C, the diameter of the water pipe 22 can be easily increased.
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 pillars 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 is provided for injecting and expanding and expanding the fluid 25 into the bag 24. The reaction force receiving portion 26 of this embodiment has two ends abutting on the core member 14 and the inner ground pile B, respectively.
a) and a cured body 26b injected and filled therein.

The cured product 26b is, for example, a product obtained by curing mortar or cement milk.
When expanding and inflating 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 material 14 and the inner ground B, respectively.

Next, the permeable underground continuous wall 10 having the above-described structure is used.
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 has already been 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.

Trailing 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, in the case of the present embodiment, as shown in FIGS.

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.

In addition, the liquid-tight bag 24 is
On the outer ground A side of No. 8, it is arranged so as to cover the entire width of the flat portion 18 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, a fluid 25 whose viscosity can be changed is injected into the liquid-tight bag 24 as shown in FIG. .
In the case of the present embodiment, the fluid 25 is a mixture of a liquid mainly composed of vegetable fibers and a liquid mainly composed of inorganic minerals.

This mixture can be reduced in viscosity by injecting a demulsifying agent. As the fluid 25 whose viscosity can be changed, for example, a gel-like substance of a superabsorbent resin can also be used.

When such a fluid 25 is injected into the liquid-tight bag 24 and expanded and expanded, the soil cement pillars 12b1 to 12b3 before solidification are pushed outward.
Both ends are in close contact with the water stop plate 18 and the outer ground A.

At this time, the bag 24 accompanying the injection of the fluid 25
In order to prevent movement of the core material 14 due to expansion and expansion of
Hardening material 26 such as cement milk is contained in elastic bag 26a.
a is injected to expand the elastic bag body 26a so that the elastic bag body 26a comes into contact with both the flange 14b of the core member 14 and the inner ground B, thereby forming the 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 core material 14 from moving due to expansion and expansion of the filter layer forming material. Further, the bag body 24 can be strongly pressed and adhered to the outer ground A.

The reaction force receiving portion 26 may inject the hardening material 26a to expand the elastic bag 26a before expanding and expanding the bag 24.

When the soil cement pillars 12b1 to 12b3 solidify with the passage of time, as shown in FIG. 7, a demulsifying agent is supplied to the fluid 25 through the water pipe 22 to reduce the viscosity. .

Then, the fluid 25 whose viscosity has been reduced is taken out to the outside through the water pipe 22, and thereafter, the fluid 25 is removed.
, Hot water is supplied to dissolve the liquid-tight bag 24 to form the space 21.

The space 21 thus formed is
Since the bag body 24 is expanded and inflated by the injection of the fluid 25, the bag body 24 has a shape corresponding to this, and the inner side follows the outer surface of the water stop plate 18, and the outer side is the soil cement column 1.
The arc following the inner surface of the excavation hole when forming 2b1 to 12b3 is a continuous concave surface.

When such a space 21 is formed, if necessary, washing water or compressed air is fed into the filter layer 20 through the water pipe 22 and remains on the outer ground A side. Removal of solidified slurry, etc. to improve water flow capacity.

Then, as shown in FIG. 8, when the filter layer 20 is formed by filling the space portion 21 with granular solids such as crushed stones, the water passage portion 16 is formed in the underground continuous wall 10. .

When supplying the demulsifying agent to the fluid 25, the hot water is supplied through the water pipe 22 before the supply thereof, so that the bag 24 is broken or the water is supplied into the water pipe 22. The rod is inserted and the bag 24 is mechanically broken.

When the water passage section 16 is provided in the underground continuous wall 10 as described above, for example, the underground continuous wall 10 having the same configuration is formed opposite to the underground continuous wall at a predetermined interval. 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 the purpose is only to remove groundwater, for example, when a pump is built in the lower end side of the water pipe 22 of the water passage section 16, the water-permeable underground continuous 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 are restrictions on the surrounding land, as in the case of the conventional water-permeable underground continuous 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.

Further, 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, and Clogging of the filter layer 20 due to 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 is exemplified.
It can also be provided on the 2a side.

Further, in the above embodiment, the case where three successive soil cement pillars 12b1 to 12b3 are formed between a pair of preceding soil cement pillars 12a has been described. 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.

[0068]

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 top view of a step performed subsequent to FIG. 6;

FIG. 8 is an explanatory top view of a step performed after FIG. 7;

9 is an explanatory longitudinal sectional view of a main part of FIG. 8;

[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 material 16 Water passage part 18 Waterproof plate 20 Filter layer 22 Water pipe 24 Liquid tight bag 25 fluid 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 the soil at the 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. Before solidification of the soil cement wall, fluid is injected into the bag inserted and installed between the water blocking plate and the outer ground to expand and expand, and after solidification of the soil cement wall, A water-permeable underground continuous wall, comprising: a filter layer filled with a particulate solid material in a space from which the fluid and the bag have been removed; and a water pipe having one end communicating with the filter layer. 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. A method for constructing an underground continuous wall in a soil ground in which a cement slurry is supplied to on-site soil and mixed, stirred, and solidified in the ground, wherein a stress is applied before the soil cement wall is solidified. 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 , A filter layer, and a water pipe, before the solidification of the soil cement wall, the water stop plate is provided between the core material, before the solidification of the soil cement wall, the water stop plate, A bag is inserted between the ground and the outside ground, and a fluid whose viscosity can be changed is injected into the bag to expand and expand, and after the soil cement wall is solidified, the fluid and the bag are removed. Space filled with granular solids The filter layer is formed, the through how to build a water-permeable diaphragm wall, characterized in that providing a water tube having one end communicating with the filter layer by. 7. Before expanding the filler layer forming material, an elastic bag is installed between the core material and the inner ground of the soil cement wall to expand the filler layer forming material. 7. The method according to claim 6, wherein a hardening liquid such as cement milk is injected into the elastic bag to expand the elastic bag. 8. The fluid whose viscosity can be changed is composed of a mixture of a liquid mainly composed of vegetable fiber and a liquid mainly composed of inorganic minerals. The method according to claim 6 or 7, wherein the viscosity is reduced by injecting an agent. 9. The continuous water-permeable underground according to claim 6, wherein the filter layer is washed through the water pipe after the soil cement wall is solidified. How to build a wall.