JP4472503B2 - Method for ensuring water permeability of aquifer - Google Patents

Description

  The present invention relates to a method for ensuring the water permeability of an aquifer layer, and more particularly, to a method for ensuring the water permeability of an aquifer layer in which the water permeability of an aquifer layer blocked by an underground continuous wall is ensured by a simple method. Is.

Conventionally, when constructing linear structures such as roads and railways by the open-cut method, underground continuous walls (holding walls) may block underground aquifers.
In such a case, there is a concern that the groundwater level will rise abnormally on the upstream side of the aquifer blocked by the underground continuous wall, and damage such as well withering or ground subsidence may occur on the downstream side.
In order to solve this problem, conventionally, a drainage well and a recharge well are constructed on the back side of the underground continuous wall (the aquifer layer blocked by the underground continuous wall), and the water is connected between them by a water pipe. Was generally adopted.
However, this construction method has a problem in that it requires labor and land for constructing a collection well and a recharge well on the back side of the underground continuous wall.
In addition, since the water collecting well and the recharge well are clogged by use, flushing (reverse cleaning) is required as a countermeasure, but there is a problem that a maintenance device for that purpose becomes large.

  The present invention has a problem in the case where the underground continuous wall blocks the underground aquifer, and the conventional construction method for constructing the water collecting well and the recharge well on the back side of the underground continuous wall in order to cope with this problem. In view of the problem, it is possible to easily prevent the groundwater level from rising abnormally upstream of the aquifer blocked by the continuous underground wall, and the occurrence of damage such as well withering and ground subsidence downstream. At the same time, an object is to provide a method for ensuring the water permeability of the aquifer layer that can easily implement measures against clogging.

In order to achieve the above object, the water-permeability securing method for a stagnant layer according to the first aspect of the present invention connects the soil cement wall , the two H-shaped steels, and the two H-shaped steels in the ground. An underground continuous wall is formed with a core material composed of a connecting plate and a bottom cover , and an opening is formed in the core material and the soil cement wall body from the center side of the core material at a position where the underground continuous wall blocks the aquifer layer. By forming a water permeable filter member that is formed and detachable by sliding along a guide groove formed in the longitudinal direction of the core material in which the opening is formed, A method for ensuring the water permeability of an aquifer layer that ensures the water permeability of the water layer, in which an opening formed in advance is made by foaming synthesis by losing a connecting plate that connects the two H-shaped steels. Underground continuous wall by sinking a core material temporarily tightened by a closure member made of resin material After reclamation, the soil cement wall of said closure member and portions thereof, so as to slide along the longitudinal direction the formed guide grooves of the core material, and cutting device for injecting in the fluid to ultra-high pressure jet This is characterized in that the opening is opened by removing it by using.

In order to achieve the same object, the method for ensuring the water permeability of the aquifer layer according to the second aspect of the present invention is that the muddy water solidified wall , the two H-section steels, and the two H-section steels are underground. An underground continuous wall is formed by the connecting plate and the core material composed of the bottom cover, and the core material and the muddy water solidified wall body are opened from the center side of the core material at a position where the underground continuous wall blocks the water-absorbing layer. By disposing a water permeable filter member that is detachable by sliding along a guide groove formed in the longitudinal direction of the core material in which the opening is formed, it is blocked by the underground continuous wall. A method for ensuring the water permeability of the aquifer layer, which is designed to ensure the water permeability of the aquifer layer, wherein an opening formed in advance is formed by lacking a connecting plate for connecting the two H-shaped steels. Creating underground continuous walls by sinking core material temporarily tightened with a closing member made of foamed synthetic resin material And then, the mud solidified wall of said closure member and portions thereof, so as to slide along the longitudinal direction the formed guide grooves of the core material, and a cutting device for injecting in the fluid to ultra-high pressure jet It is removed by use to open the opening.

  According to the method for ensuring the water permeability of the aquifer layer of the first invention, an opening is formed in the core material and the soil cement wall from the center side of the core material at a position where the underground continuous wall blocks the aquifer layer, By disposing a water permeable filter member that can be attached to and detached from the core material that forms the opening, it is possible to ensure the water permeability of the stagnant water layer blocked by the underground continuous wall. It is possible to easily prevent the groundwater level from rising abnormally on the upstream side of the blocked aquifer and from causing damage such as well withering and ground subsidence on the downstream side, and measures against clogging can be easily implemented.

  Further, according to the method for ensuring the water permeability of the aquifer layer of the second invention, an opening is formed in the core material and the muddy water solidified wall body from the center side of the core material at a position where the underground continuous wall blocks the aquifer layer. In addition, by disposing the water permeable filter member that can be attached to and detached from the core material having the opening, it is possible to ensure the water permeability of the stagnation layer blocked by the underground continuous wall. It is possible to easily prevent the groundwater level from rising abnormally on the upstream side of the aquifer blocked by the wall, and to cause damage such as well withering and ground subsidence on the downstream side, and to easily implement countermeasures against clogging .

And, after building the underground continuous wall by sinking a member (core material ) temporarily tightened with a closing member, the opening is formed by removing the closing member. The earth and sand and soil cement can be prevented from entering the member, and the opening can be formed smoothly.

  In addition, the closing member is composed of a closing plate formed of a foamed synthetic resin material, and the closing member, and further, the soil cement wall body and the muddy water solidified wall body of the portion are jetted as an ultrahigh pressure jet. By removing by using a cutting device and opening the opening, the opening can be formed in accordance with the properties of the member to be used and the ground.

  Hereinafter, an embodiment of the water permeability securing method for a stagnant layer according to the present invention will be described with reference to the drawings.

1 to 11 show an embodiment of the method for ensuring the water permeability of the aquifer layer of the present invention.
As shown in FIG. 1, the construction method for securing the water permeability of the aquifer layer is to construct a linear structure S such as a road or a railway by the open-cut method, so that the underground continuous wall (residence wall) 1 is underground. Even when the aquifer WS is cut off, the groundwater level abnormally rises upstream of the aquifer WS blocked by the underground continuous wall 1 and damage such as well withering and ground subsidence occurs downstream. In order to prevent this, the soil and cement slurry are mixed and stirred in the ground to form the underground continuous wall 1 composed of the soil cement wall body 11 and the core material 12 in the ground. The cores 12a and 11a are formed in the core material 12 and the soil cement wall body 11 from the center side of the core material 12 at the position where the underground continuous wall 1 blocks the aquifer WS, and the core formed with the opening 12a. Water permeable filter member 3 detachable from the material 12 By arranging, in which so as to ensure the water permeability of the aquifer WS that is blocked by the diaphragm wall 1.
The shape (size) and the number of openings 11a, 12a formed in the soil cement wall 11 and the core material 12 are appropriately set according to the amount of water flow in the aquifer layer WS blocked by the underground continuous wall 1 can do.

In this case, the core material 12 constituting the underground continuous wall 1 is not particularly limited. However, in this embodiment, for example, as shown in FIGS. The water passage box 13 is formed by partitioning the two H-shaped steels with a connecting plate 13a and a bottom cover 13b.
In the present embodiment, the opening 12a is formed by lacking the connecting plate 13a at the position where the aquifer layer WS on the back side (and excavation side) of the underground continuous wall 1 is blocked, and the opening 12a. The water flow box 13 is communicated with the outside via

The opening 12a formed in the core member 12 can be temporarily tightened by the closing members 12c and 12d.
The closing member for temporarily tightening the opening 12a may be constituted by a water shielding plate 12c which is detachable by sliding along a guide groove 12b formed in the longitudinal direction of the core member 12, or a synthetic resin material, preferably Can be constituted by a closing plate 12d formed of a foamed synthetic resin material, or can be used in combination as in the present embodiment.
The water passage box 13 is formed with a water shielding plate stopper 13g for positioning the water shielding plate 12c at a predetermined height.
Thereby, after forming the underground continuous wall 1 by sinking the core material 12 in which the opening 12a formed in advance is temporarily fastened by the closing members 12c and 12d to the soil cement wall body 11, the closing members 12c and 12d are removed. Thus, the opening 12a can be formed, thereby preventing the earth and sand and soil cement from entering the water flow box 13 formed in the core member 12, and forming the opening 12a. It can be done smoothly.

Here, in the case of the water shielding plate 12c, the removal of the closing member is performed by sliding the water shielding plate 12c along the guide groove 12b from the ground.

On the other hand, in the case of the closing plate 12d, there is no particular limitation. In this embodiment, for example, as shown in FIGS. 4 is used, the opening 11a is simultaneously formed in the soil cement wall 11 together with the opening 12a. When the water shielding plate 12c is used in combination, the cutting device 4 is used after the water shielding plate 12c is pulled out from the ground by sliding along the guide groove 12b.
The cutting device 4 for injecting a fluid such as water into an ultra-high pressure jet is formed in a supply pipe 41 for supplying the fluid such as water and a supply pipe 41 for injecting the supplied fluid such as water as an ultra-high pressure jet. The supply nozzle 41 and the guide member 43 for installing the injection nozzle 42 at a predetermined position by sliding along the guide groove 12b formed in the longitudinal direction of the core member 12 are configured. .

In this way, after the openings 12a and 11a are formed in the core material 12 and the soil cement wall body 11 from the center side of the core material 12 at the position where the underground continuous wall 1 blocks the aquifer WS, the opening 12a is formed. The permeable filter member 3 that can be attached and detached by sliding along the guide groove 12b formed in the longitudinal direction of the core material 12 is disposed on the core material 12 formed with The water permeability of the formed aquifer WS is ensured.
Here, as shown in FIGS. 4, 7, and 11, the water permeable filter member 3 is, for example, an endren mat rib type water permeable filter material (high density polyethylene) in the opening 30 of the substrate (water shielding plate) 31. A plate-like drainage material (32) wrapped with a spunbond nonwoven fabric and a water-impermeable sheet is provided, and this is covered with a grating 33.
The water permeable filter member 3 can be back-washed or replaced by the water permeable filter member 3 periodically or when clogged, thereby easily implementing measures against clogging.

  In this case, when the target aquifer WS exists at a position deeper than the bottom of the linear structure S, as shown in FIG. 1A and FIGS. Openings 12a and 11a are formed in the core material 12 and the soil cement wall body 11 from the center side of the core material 12 at a position where the water blocking layer WS is cut off to both the back side and the excavation side. The removable water permeable filter member 3 is disposed on both the back surface side and the excavation side of the core material 12 that forms 12a so as to ensure the water permeability of the aquifer layer WS blocked by the underground continuous wall 1. To.

And in the case where the particles of earth and sand constituting the target aquifer WS are relatively small, as shown in FIG. 2, in the openings 12a formed on both the back side and the excavation side of the core material 12, A water-permeable filter member 13c made of a relatively coarse wire mesh (for example, φ0.4 mm × 10 mesh stainless steel wire mesh) is disposed in advance (a closing plate 12d formed of a foamed synthetic resin material on the outside thereof). By using the cutting device 4 that jets a fluid such as water as an ultra-high pressure jet, the closing plate 12d disposed in the opening 12a is pulverized through the water permeable filter member 13c, and soil cement is used. The wall 11 is crushed to form the opening 11a.
Thus, even after the openings 11a and 12a are formed, the permeable filter member 13c can prevent the earth and sand from flowing into the water passage box 13, and thereafter, the both sides of the back surface side and the excavation side of the core material 12 can be promptly used. A water permeable filter member 3 that can be attached to and detached from is provided.

On the other hand, when the target aquifer WS exists at a position shallower than the bottom of the linear structure S, as shown in FIG. 1 (b) and FIGS. Openings 12a and 11a are formed in the core material 12 and the soil cement wall body 11 from the center side of the core material 12 at the position where the wall 1 blocks the aquifer WS to the back side, and the opening 12a is formed. By disposing the removable water permeable filter member 3 on the back surface side of the core material 12, the water permeability of the stagnant water layer WS blocked by the underground continuous wall 1 is ensured.

And in this case, since the linear structure S exists between the underground continuous walls 1 and 1 arranged side by side, the aquifer layer WS blocked by the linear structure S is arranged in the underground. It communicates with the water pipe 2 arrange | positioned between the continuous walls 1 and 1. As shown in FIG.
The water flow pipe 2 is connected to the water flow box 13 directly or via a valve 13d disposed in the water flow box 13.
In addition, the water pipe 2 can be installed in an arbitrary place such as the bottom of the linear structure S or the inside thereof, or the lower part of the bottom of the linear structure S.
Further, the water pipe 2 is provided with a flow meter 21 as necessary, or a bypass pipe (not shown) for preventing the flow meter 21 from being affected when performing reverse cleaning. Like that.

  According to this method for ensuring the water permeability of the aquifer layer, openings 12a and 11a are formed in the core member 12 and the soil cement wall body 11 from the center side of the core member 12 at a position where the underground continuous wall 1 blocks the aquifer layer WS. The water-permeable layer WS blocked by the underground continuous wall 1 can be secured by disposing the water permeable filter member 3 so as to be detachable from the core member 12 having the opening 12a. Thus, it is possible to easily prevent the groundwater level from rising abnormally on the upstream side of the aquifer WS blocked by the underground continuous wall 1 and the occurrence of damage such as well withering and ground subsidence on the downstream side, Measures against clogging can be easily implemented.

  By the way, although the said Example demonstrated the case where the underground continuous wall 1 which consists of the soil cement wall body 11 and the core material 12 in the ground by mixing and stirring soil and cement slurry in the ground, Even in the case of creating an underground continuous wall consisting of a muddy water solidified wall body and a core material in the ground, as in the above embodiment, by forming a water flow box or the like in the core material, Can be secured.

12 to 14 show a first reference example of the method for ensuring water permeability of the aquifer layer.
Water permeability securing method of the aquifer, in the same manner as mentioned above actual施例, even when the diaphragm wall (earth retaining walls) 1 has become possible to cut off the aquifer WS underground diaphragm wall 1 In order to prevent the groundwater level from rising abnormally on the upstream side of the aquifer WS blocked by the ground and the occurrence of damage such as well withering and ground subsidence on the downstream side. By forming the underground continuous wall 1 composed of 14 and forming an opening 14a in the steel pipe sheet pile 14 from the center side of the steel pipe sheet pile 14 at a position where the underground continuous wall 1 blocks the aquifer WS, The water permeability of the aquifer layer WS blocked by the continuous wall 1 is ensured.

In this case, as for the steel pipe sheet pile 14 which comprises the underground continuous wall 1, when the buoyancy at the time of sinking the bottom cover 13e (steel pipe sheet pile 14 is large as shown to Fig.13 (a), As shown in FIG. 13 (b), the water flow box 13 is formed by partitioning with a bottom lid type bottom lid 13f).
And in this reference example, the opening part 14a is formed in the position which interrupts the aquifer WS on the back side (and excavation side) of the underground continuous wall 1, and the water flow box 13 is formed through this opening part 14a. Communicate with the outside.

The opening 14a is not particularly limited, in the present Reference Example, for example, as shown in FIGS. 13 14, the horizontal direction (FIG. 14 (b)) or vertically (FIG. 14 ( c)) By using the cutting device 4 provided with the rotating grindstone cutter 44 and the supporting jack 45, the water stagnated by the underground continuous wall 1 by forming the slit-shaped opening 14 a. The water permeability of the layer WS is ensured.

And when the particle | grains of the earth and sand which comprise the target aquifer WS are comparatively small etc., as shown in FIG. 13, the water-permeable filter member 3 which can be attached or detached to the inside of the steel pipe sheet pile 14 as needed is shown. Try to arrange.
Here, the water permeable filter member 3 is, for example, an endren mat rib type water permeable filter material at an opening of a base body (water shielding body) 34 formed in a cylindrical shape disposed along the inner peripheral surface of the steel pipe sheet pile 14. (A plate-shaped drainage material in which a rib structure made of high-density polyethylene is wrapped with a spunbond nonwoven fabric and a water-impermeable sheet) 35 is disposed and configured.
In addition, by applying a coating 36 of urethane resin or fluororesin on the peripheral surface of the base body (water shielding body) 34 formed in a cylindrical shape, the base body (water shielding body) 34 can be smoothly moved along the inner peripheral surface of the steel pipe sheet pile 14. So that it can be disposed.

Other configurations and operations of the present embodiment is the same as the actual施例.

15 shows a second reference example of the water permeability secure method of water bearing layer.
Water permeability securing method of the aquifer, in the same manner as mentioned above actual施例, even when the diaphragm wall (earth retaining walls) 1 has become possible to cut off the aquifer WS underground diaphragm wall 1 In order to prevent the groundwater level from rising abnormally on the upstream side of the aquifer WS blocked by the ground and the occurrence of damage such as well withering and land subsidence on the downstream side, the reinforced concrete wall in the ground The underground continuous wall 1 composed of the body 15 was formed, and the underground continuous wall 1 was previously disposed on the reinforced concrete wall 1 at a position where the underground water layer WS was blocked so as to contact the aquifer WS. By forming the opening 16 a in the water flow box 16, water permeability of the aquifer layer WS blocked by the underground continuous wall 1 is ensured.

In this case, the opening 16a in the water flow box 16 can be temporarily fastened by the closing member 16b, and the earth and sand or concrete is provided in the water flow box 16 by disposing the prevention sheet 15a. To prevent intrusion.
The closing member for temporarily tightening the opening 16a can be constituted by a water shielding plate 16c that is detachable by sliding along a guide groove 16b formed in the longitudinal direction of the water flow box 16.

  Although this opening part 16a is not specifically limited, For example, by making it a slit-shaped opening part, the water permeability of the aquifer layer WS interrupted | blocked by the underground continuous wall 1 is ensured.

  And when the particle | grains of the earth and sand which comprise the target aquifer WS are comparatively small etc., it replaces with the water-impervious board 16c, and the water-permeable filter member 3 can be arrange | positioned.

  And in this case, between the underground continuous walls 1 and 1 arranged side by side, the water flow pipe 16d and the valve 16e arranged so as to cross the underground continuous wall 1 arranged in the water flow box 16 and the parallel continuous walls 1 and 1 were arranged. It communicates with the water pipe 2 arrange | positioned between the underground continuous walls 1 and 1. As shown in FIG.

Other configurations and operations of the present embodiment is the same as the actual施例.

By the way, although the said reference example demonstrated the case where the underground continuous wall 1 which consists of a reinforced concrete wall 15 was built in the underground, when creating the underground continuous wall which consists of steel walls, the above-mentioned reference example and Similarly, the water permeability of the aquifer layer can be ensured by arranging the water flow box.

Although the water permeability secure method of aquifers of the present invention have been described based on the example of its, the present invention is not limited to the configuration described in the above embodiment, the actual施例and Reference Example In the range which does not deviate from the meaning, such as combining the structure described in 1), for example, the formation method of an opening part suitably, the structure can be changed suitably.
Finally, the features and advantages of the method for ensuring the water permeability of the aquifer layer of the present invention using the water flow boxes 13 and 16 will be listed together.
1. The water flow box can be arbitrarily designed to have a planar cross-sectional shape such as a rectangle or a circle.
2. The water flow box can be constructed within the construction section of the underground continuous wall.
3. Since the water flow box can be constructed during the construction of the underground continuous wall, conventional water collection well construction becomes unnecessary.
4). The flow cross section and installation location of the water flow box can be set arbitrarily, and design according to the amount of water flow in the aquifer layer is possible.
5). Only the target aquifer can be selected and water flow treatment is possible.
6). It is possible to construct the aquifer that exists at a position deeper than the bottom of the linear structure and at a shallow position.
7). Since the inside of the water flow box is constantly only passing through groundwater by natural flow, no special power is required, and maintenance is easy.
8). The water permeable filter member can be easily cleaned and replaced, and the water flow function can be easily restored.
9. Extraction of the permeable filter member and analysis and inspection of components contained in the groundwater remaining on the permeable filter member are possible. Further, the water permeable filter member can be selected and exchanged according to the result of the analysis inspection.
10. The water flow function of the water permeable filter member can be compared with the water flow function at the boundary between the natural ground and the water permeable filter member, and an appropriate maintenance date for the water flow box can be set.
11. When clogging occurs at the boundary between the water permeable filter member and the natural ground, the water flow function can be easily restored by reverse cleaning by spraying a fluid such as water as an ultra-high pressure jet.

  The method for ensuring the water permeability of the aquifer layer of the present invention is that the groundwater level abnormally rises upstream of the aquifer layer blocked by the underground continuous wall, and damage such as well withering and ground subsidence occurs downstream. In addition to being able to easily prevent clogging, it is possible to easily implement countermeasures against clogging.Therefore, by constructing linear structures such as roads and railways by the open-cut method, the underground continuous wall forms an underground aquifer. In the case of blocking, etc., it can be widely used as a method for ensuring the water permeability of the stagnant layer.

1 shows an embodiment of a method for ensuring the water permeability of an aquifer layer of the present invention, wherein (a) is a schematic cross-sectional view when the target aquifer layer is present at a position deeper than the bottom of the linear structure; ) Is a schematic cross-sectional view when the target aquifer layer is present at a position shallower than the bottom of the linear structure. The case where the target aquifer exists in a position deeper than the bottom of the linear structure is shown, (a) is an overall sectional view, (b) is an AA sectional view of (a), (c) is It is BB sectional drawing of (a). The case where the target aquifer exists in a position deeper than the bottom of the linear structure is shown, (a) is a side view seen from the excavation side, (b) is a side view seen from the back side, (c ) Is a cross-sectional view taken along line AA of (a) and (b), (d) is a cross-sectional view taken along line BB of (a) and (b), and (e) is a cross-sectional view taken along line CC of (a) and (b). (F) is a DD cross-sectional view of (a) and (b). The water-permeable filter member is shown, (a) is an overall view, (b) is a main part view, (c) is an AA cross-sectional view of (b), and (d) is a BB cross-sectional view of (b). . The case where the target aquifer exists in a position shallower than the bottom of the linear structure is shown, (a) is an overall cross-sectional view, (b) is an enlarged view of part A of (a), (c) is It is BB sectional drawing of (a). The case where the target aquifer exists in a position shallower than the bottom of the linear structure is shown, (a) is a side view seen from the excavation side, (b) is a side view seen from the back side, (c ) Is a cross-sectional view taken along line AA of (a) and (b), (d) is a cross-sectional view taken along line BB of (a) and (b), and (e) is a cross-sectional view taken along line CC of (a) and (b). (F) is a DD cross-sectional view of (a) and (b). The water-permeable filter member is shown, (a) is an overall view, (b) is a main part view, (c) is an AA cross-sectional view of (b), and (d) is a BB cross-sectional view of (b). . It is a schematic perspective view which shows one Example of the water permeability ensuring construction method of the aquifer layer of this invention. A cutting device for use in real施例of water permeability secure method of aquifers of the present invention is a schematic perspective view showing. A cutting device for use in real施例of water permeability secure method of aquifers of the present invention is a main part perspective view showing. It is a partial perspective view showing the actual施例of water permeability secure method of aquifers of the present invention. It is a partial perspective view showing a steel pipe sheet piles used in the first reference example of the water permeable secure method of water bearing layer. Shows a first reference example of the water permeable secure method of water bearing layers, (a) represents a schematic perspective view of the buoyancy when sinking a steel pipe sheet pile is small, buoyancy when sinking the (b) steel pipe sheet pile large It is a schematic perspective view in the case. It shows the cutting device used in the first reference example of the water permeable secure method of water bearing layers, (a) shows the process diagram, (b) is an explanatory view of a grindstone cutter lateral rotation of (c) longitudinally It is explanatory drawing of a grindstone cutter. Shows a second reference example of the water permeability secure method of water bearing layers, (a) shows the top perspective view, (b) is a bottom perspective view.

S linear structure WS aquifer 1 underground wall 11 soil cement wall 11a opening 12 core material 12a opening 12b guide groove 12c closing member (water shielding plate)
12d Closing member (closing plate)
13 Water flow box 13a Connecting plate 13b Bottom cover 13c Permeable filter member 13d Valve 13e Bottom cover 13f Bottom cover 13g Water shielding plate stopper 14 Steel pipe sheet pile 14a Opening 15 Reinforced concrete wall 16 Water flow box 16a Opening 16b Guide groove 16c Water blocking Plate 16d Water flow pipe 16e Valve 2 Water flow pipe 21 Flowmeter 3 Water permeable filter member 30 Opening 31 Substrate (water shielding plate)
32 Water permeable filter material 33 Grating 34 Substrate (water shielding body)
35 Water-permeable filter material 36 Coating 4 Cutting device

Claims (2)

A soil cement wall in the ground, to construct a diaphragm wall in the connecting plate and the core material made of a bottom cover for connecting the two H-shaped steel and the two H-shaped steel, in該地An opening is formed in the core material and the soil cement wall body from the center side of the core material at a position where the continuous wall blocks the aquifer layer, and along the guide groove formed in the longitudinal direction of the core material forming the opening by disposing the permeable filter member which is detachable by sliding, a water-permeable secure method of aquifers which is adapted to secure the water permeability of the aquifer, which is blocked by underground continuous wall The underground continuous wall is formed by sinking a core material obtained by temporarily fastening an opening formed in advance by a closing member made of a foamed synthetic resin material by lacking a connecting plate for connecting the two H-shaped steels. after reclamation, the soil cement wall of said closure member and portions thereof, So as to slide along the longitudinal direction the formed guide grooves of Kishinzai and removed by using a cutting apparatus which ejects to the fluid to ultra-high pressure jet, and so as to open the opening A method for ensuring the water permeability of an aquifer layer. A muddy water solidified wall body , two H-shaped steels, a connecting plate that connects the two H-shaped steels, and a core material consisting of a bottom cover , are formed into a ground wall. An opening is formed in the core material and the muddy water solidified wall body from the center side of the core material at a position where the continuous wall blocks the aquifer, and along the guide groove formed in the longitudinal direction of the core material forming the opening. by disposing the permeable filter member which is detachable by sliding, a water-permeable secure method of aquifers which is adapted to secure the water permeability of the aquifer, which is blocked by underground continuous wall The underground continuous wall is formed by sinking a core material obtained by temporarily fastening an opening formed in advance by a closing member made of a foamed synthetic resin material by lacking a connecting plate for connecting the two H-shaped steels. after reclamation, the mud solidified wall of said closure member and a portion thereof, a longitudinal direction of the core member So as to slide along the formed guide grooves, and is removed by the use of cutting apparatus for injecting in the fluid to ultra-high pressure jet, characterized in that so as to open the opening ponding Method for ensuring water permeability of the layer.

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