JP2002021080A - Earth retaining wall having underground stream preserving function, and method for constructing earth retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-sealing earth retaining wall having an underground stream preserving function, which can restore water passage through the water- sealing earth retaining wall which has been constructed on a permeable layer, after building of an underground structure. SOLUTION: The water-sealing earth retaining wall is constructed for building the underground structure in the excavated ground. According to the earth retaining wall, a water passing hole for passing underground stream at an arbitrary time is formed at a portion corresponding to the underground stream.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-impervious retaining wall for constructing an underground portion of civil engineering or a building structure, and more particularly to a technique for maintaining the flow of groundwater flow interrupted by the water-impervious retaining wall.

[0002]

2. Description of the Related Art In the case of constructing a linear underground structure such as a subway or an underground road, and continuously constructing a deep water-impervious retaining wall, free groundwater flow in the area may be interrupted. FIG. 10 is a schematic diagram showing a state in which the groundwater flow is interrupted by the impermeable mountain retaining walls 100a and 100b. Here, the water-impervious retaining walls 100a and 100b are deeper than the flooring 107 to stabilize the ground of the excavated bottom, and the permeable layer 105
The long root 108 penetrates through the holes 105a and 105b and extends to the water-impermeable layer 106b. Therefore, groundwater flow 160a,
160b is blocked by the water-impervious retaining wall 100b on the upstream side.

When the groundwater flows 160a, 160b are blocked by the impermeable mountain retaining walls 100a, b, the ground surface 150a on the downstream side undergoes land subsidence due to a decrease in the groundwater level. In addition, the standing tree 130a withered due to the drop in the groundwater level, and the well 1
Twenty wells die. Further, there is an influence such as settlement of the structure 110a such as a building.

On the upstream side of the impermeable mountain retaining wall 100b, the water level rises due to the blocking of the groundwater flow, and the trees 130
b may cause root rot failure, and water leakage may occur in the underground portion of the structure 110b. Moreover, since the circulation of the groundwater flow is lost, the water quality of the groundwater itself may be reduced. Such effects on the surrounding environment appear during construction.

Further, the water-impervious retaining walls 100a and 100b penetrate through the permeable layer 105b at a portion deeper than the flooring 107 so that the flooring 107 does not rise under the influence of the groundwater underneath to raise the underground structure. And penetrates to the water-impermeable layer 106b. Therefore, the groundwater flow 160b that is deeper than the flooring 107 that is opened for construction of the structure is also blocked.

[0006] In order to solve the above-mentioned problem, a method of restoring the groundwater flow at the top of the underground structure by removing the impermeable retaining wall after completion of the underground structure. A method of drilling the wall of the cut-out section of the impermeable mountain retaining wall, inserting a collecting pipe into the upstream permeable ground, and connecting with the drain pipe inserted into the downstream permeable ground to restore the groundwater flow. 2. Description of the Related Art A method is known in which drainage wells are dug on both sides of an excavated portion of a water impervious retaining wall, and an upstream well and a downstream well are connected underground to restore groundwater flow. However, in these groundwater flow maintenance methods, the groundwater flow 160 above the excavated flooring 107 is not used.
However, there is a problem that the groundwater flow 160b at a portion deeper than the flooring 107 cannot be restored.

In addition, there is a problem that maintenance costs such as clogging of the well after construction are expensive.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been developed after the construction of an underground structure.
An object of the present invention is to provide a water-impervious retaining wall having a groundwater flow preservation function capable of restoring water flow through a water-impervious retaining wall provided in a permeable layer.

In particular, it is an object of the present invention to provide a water-impervious retaining wall capable of easily and economically restoring a groundwater flow at a depth deeper than a floor.

Another object of the present invention is to restore a groundwater flow after backfilling in a construction site where restoration on the ground is urgent.

Means for Solving the Problems In order to solve the above-mentioned problems, a retaining wall having a groundwater flow preserving function of the present invention is a water-impervious retaining wall constructed for constructing an underground excavated structure, A water passage hole through which the groundwater flow passes at an arbitrary time is formed in a portion corresponding to the groundwater flow.

According to a second aspect of the present invention, in the first aspect of the present invention, the water-blocking retaining wall is formed of a steel sheet pile having the water passage hole at an arbitrary depth for blocking groundwater flow. It is characterized.

According to a third aspect of the present invention, in the first aspect of the present invention, the water-blocking retaining wall is made of a steel pipe sheet pile having the water passage hole at an arbitrary depth to block groundwater flow. It is characterized.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the water-blocking retaining wall is a soil mortar wall having the water passage hole at an arbitrary depth to block groundwater flow. It is characterized by the following.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the water-impervious retaining wall is made of a reinforced concrete wall having the water passage hole at an arbitrary depth to block groundwater flow. Features.

The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the water passage hole has a closed water passage, and the water passage is hollow. A main body made of a conductive metal of the body, one or more electrodes provided near an inner wall in the main body, and an electrolyte solution and a gap filling material filled in the main body, and a voltage is applied to the electrodes at any time. Is applied to make the main body wall surface brittle by electrolytic corrosion to break through and form a water passage hole through which the groundwater flow can pass.

The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the water passage is connected to an electrolyte solution supply pipe.

Further, the invention of claim 8 provides the invention according to claims 1 to 7
In the invention described in any one of the above, the water passage portion is characterized in that an inner wall other than the electrolytic corrosion portion near the electrode is covered with an insulating layer.

According to a ninth aspect of the present invention, there is provided the first aspect of the present invention.
The invention according to any one of claims 6, 7 and 8, wherein the water passage hole according to claims 4 and 5 is a hydration reaction between the electrolyte solution leaking from the water passage part penetrated and the expansible crushed material. The mortar further includes a crushing section that crushes soil mortar or concrete that expands to form a mountain retaining wall around the water flow section and forms a water flow hole through which the groundwater flow can pass.

A tenth aspect of the present invention is a method for constructing a retaining wall according to the present invention, comprising constructing an underground excavation structure to cut off the ground for an underground excavation structure, and then constructing the underground excavation structure. A water passage hole through which the water passes.

The invention according to claim 11 is the invention according to claim 10, wherein the water passage hole is a water-impervious retaining wall portion at a position deeper than the flooring of the excavated underground excavation structure, At any time after the construction of the underground excavation structure, the water passage is destroyed and penetrated at any time, forming a water passage hole, and conserving the water flow of the groundwater flow interrupted by the impermeable retaining wall. .

According to a twelfth aspect of the present invention, in accordance with the tenth aspect of the present invention, the water passage hole is a water-impervious retaining wall portion on a side surface or an upper portion of the underground excavation structure, and is provided at any time during construction. The water flow through the water flow section is broken through to form a water passage hole, and the upstream and downstream water flow openings are connected by a connecting pipe, so that the flow of the groundwater flow interrupted by the impermeable retaining wall can be reduced. It is characterized by conservation.

According to a thirteenth aspect of the present invention, in the tenth aspect, the water passage hole is a water passage portion of a water-impervious retaining wall portion on a side surface or an upper portion of the underground excavation structure, and the underground excavation is provided. At any time after the construction and backfilling of the structure, at any time after the ground restoration, a water passage hole is formed by destroying and penetrating the water passage, and the feature is to preserve the groundwater flow blocked by the impermeable retaining wall. And

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are views showing an embodiment of a retaining wall having a groundwater flow preservation function of the present invention using a steel sheet pile. 3 and 4 are views showing an embodiment of a retaining wall having a groundwater flow preservation function of the present invention using a steel pipe sheet pile. 5 and 6 are views showing an embodiment of a retaining wall having a groundwater flow preservation function of the present invention using soil cement. 7 and 8 are views showing an embodiment of a retaining wall having a groundwater flow preservation function of the present invention using reinforced concrete. FIG. 9 is a schematic view showing the state of restoration of the groundwater flow after the construction of the retaining wall having the groundwater flow preservation function of the present invention.

FIG. 1 shows a water-impervious retaining wall 1 made of a steel sheet pile 15 constructed for constructing an underground excavation structure of the present invention.
00 is a front view showing an embodiment of the second embodiment, wherein a water passage hole 1 is provided at a depth where a groundwater flow is blocked.
In the figure, adjacent steel sheet piles 15, 15 are connected by a connecting portion 15a, and the water gap may be further increased by a waterproof filler in the connecting gap.

The water passage hole 1 is a hollow water passage portion 2 formed by welding into a recess of a steel sheet pile 15, one of which is a bottom surface of a main body portion 3 forming a housing, one of which is a steel sheet pile 15, and an upper plate which is an upper surface. A wire mesh 3b having a water-permeable gap in the opening is welded to 3a. Further, an electrolyte solution supply pipe 8 is provided above the water passage section 2.
The electrolyte solution supply pipe 8 extends to the upper part of the flooring surface 107 to be cut and provided with an electrolyte solution supply port 8a. An electric wire 13b connected to the cathode of the DC power supply 13 is inserted into the electrolyte solution supply pipe 8 and connected to an electrode (described later) in the water passage.

When applying a voltage to the electrodes, a DC power source 1
3 is connected to the connection terminal 14 of the steel sheet pile 15 by the electric wire 13a.
This is done by connecting to a.

FIG. 2 is a cross-sectional view showing the AA section of FIG. The cross section of the hollow water passage part 2 formed by welding in the recess of the steel sheet pile 15 forming the water-shielding retaining wall 100 is shown. The electrode 4 held by the electrode support member 4a made of an insulating material adhered to the wall of the steel sheet pile 15 is provided inside the water passage section 2.
Is disposed at a position close to the through portion 7 that is broken through by electrolytic corrosion to form the water passage hole 1, and the hollow portion is filled with a gap filler 6 such as crushed stone having a water-permeable gap. The electric wire 1 inserted through the electrolyte solution supply pipe 8 is connected to the electrode 4.
3b is connected. Penetration portions 7 at both ends of main body 3
The other inner walls are provided with an insulating layer 9 of an insulating paint or the like to prevent electrolytic corrosion.

FIG. 3 shows that the water passage hole 1 is provided at a depth where the water-impervious retaining wall 100 made of a steel pipe sheet pile 16 constructed for constructing the underground excavation structure of the present invention blocks the groundwater flow. It is a top view which shows one Embodiment of Claim 3. In the figure, adjacent steel pipe sheet piles 16 and 16 are connected portion 1
The connection gap is maintained by a waterproof filler (not shown) in the connection gap.

The water passage hole 1 is a hollow water passage portion 2 provided so as to cross the inside of the column of the steel pipe sheet pile 16 and is fixed to the peripheral wall of the steel pipe sheet pile 16 by welding. . An electrolyte solution supply pipe 8 is connected to the upper part of the water passage part 2, and the electrolyte solution supply pipe 8 extends to the upper part of the flooring surface 107 to be cut and provided with a valve 8b and an electrolyte solution supply port 8a. . Further, a DC power supply 1 is provided in the electrolyte solution supply pipe 8.
An electric wire 13b connected to the cathode of No. 3 is inserted and connected to an electrode described later in the water passage section.

FIG. 4 is a longitudinal sectional view showing a BB section of FIG. Steel sheet pile 16 forming water-impervious retaining wall 100
2 shows a cross section of a water passage 2 of a hollow body provided so as to cross the inside of the column. The water-passing portion 2 is a main body 3 having both ends in the longitudinal direction made of a conductive metal closed. Inside the main body 3, an electrode 4 held by an electrode support member 4a made of an insulating material is broken and penetrated by electrolytic corrosion. The hollow portion is filled with a gap filler 6 such as crushed stone having a water-permeable gap. An electric wire 13b inserted through the electrolyte solution supply pipe 8 is connected to the electrode 4 via a connection terminal 14b. The inner walls other than the penetrating portions 7 at both ends of the main body portion 3 are provided with an insulating layer 9 made of an insulating paint or the like to prevent electrolytic corrosion. When a voltage is applied to the electrodes, the anode of the DC power supply 13 is connected to the connection terminal 14a of the steel pipe sheet pile 16 by an electric wire 13a.

FIG. 5 shows a water passage hole 1 provided at a depth where a water-impervious retaining wall 100 composed of a soil mortar wall 17 constructed for constructing an underground excavation structure of the present invention blocks a groundwater flow. It is a top view which shows one Embodiment of Claim 4 described above. In the figure, a soil mortar wall 17 is provided in a wall hole perforated so as to overlap the circumference.
b, and a pile core made of H-shaped steel 17a is inserted as a reinforcing material in the center thereof and solidified.

The water passage hole 1 comprises a water passage portion 2 and a crushing portion 10. The water passage portion 2 is a main body portion 3 of a hollow body provided so as to cross a concave portion on one side of the H-section steel 17a. H-section steel 17a
It is fixed by welding to the center wall and both end wings. The crushing part 10 is welded and fixed to outer wall surfaces of both end wings of the H-section steel 17a. Further, an electrolyte solution supply pipe 8 is connected to an upper part of the water passage part 2, and the electrolyte solution supply pipe 8 extends to an upper part of the flooring surface 107 to be cut (see FIG. 6), and a valve 8b and an electrolyte solution supply port 8a. Is provided. Also,
An electric wire 13b connected to the cathode of the DC power supply 13 is inserted into the electrolyte solution supply pipe 8 and connected to an electrode (described later) in the water passage.

FIG. 6 is a longitudinal sectional view showing a section taken along line CC of FIG. A water passage portion 2 provided so as to cross a concave portion of an H-shaped steel 17a of a pile core material of a soil mortar wall 17 forming a water-impervious retaining wall 100, and a crushing portion provided on outer surfaces of both end wings of the H-shaped steel 17a. 10 shows a cross section. Water passage 2
Denotes an upper plate 3a made of a conductive metal, a lower plate 3c, and a side plate 3
d is welded to the center wall and both end wings of an H-section steel 17a, and a hollow closed main body 3 is formed inside the main body 3 to hold an electrode 4 held by an electrode support member 4a made of an insulating material. Penetrates 7 to form a water passage hole by breaking through with electrolytic corrosion
The hollow portion is filled with a gap filler 6 such as crushed stone having a water-permeable gap. The electrode 4
Is an electric wire 13b inserted through the electrolyte solution supply pipe 8.
Are connected by the connection terminal 14b. The inner walls other than the penetrating portions 7 at both ends of the main body portion 3 are provided with an insulating layer 9 made of an insulating paint or the like to prevent electrolytic corrosion. When a voltage is applied to the electrodes, the anode of the DC power supply 13 is connected to the connection terminal 14a of the steel pipe sheet pile 16 by an electric wire 13a.

As shown in FIG. 6, the crushing section 10
Square frame 1 formed by welding to the outer surfaces of both end wings of shaped steel 17a
A plurality of expansible crushed material packaging bodies 11 are housed inside 0a, and are packaged with a waterproof cover 10b made of a waterproof material that blocks moisture of the poured soil cement.

FIG. 7 shows that the water passage hole 1 is provided at a depth where the water-impervious retaining wall 100 composed of the reinforced concrete wall 18 constructed for constructing the underground excavation structure of the present invention blocks the groundwater flow. It is a top view which shows one Embodiment of Claim 5. In the figure, a reinforced concrete wall 18 is obtained by filling and solidifying concrete 18c in a perforated wall hole with reinforcing bars 18a and 18b as reinforcing materials. 18a indicates a main muscle, and 18b indicates a hoop muscle.

The water passage hole 1 comprises a water passage portion 2 and a crushing portion 10 housed inside both ends of the water passage portion. The water passage portion 2 is a hollow body provided so as to cross the concrete wall 18. Are welded and fixed to the reinforcing bars 18a, 18b.
Further, an electrolyte solution supply pipe 8 is connected to an upper part of the water passage part 2, and the electrolyte solution supply pipe 8 extends to an upper part of the flooring surface 107 to be cut and cut (see FIG. 8), and a valve 8b and an electrolyte solution supply port 8a. Is provided. In addition, an electric wire 13b connected to the cathode of the DC power supply 13 is inserted into the electrolyte solution supply pipe 8, and is connected to an electrode (described later) in the water passage section.

FIG. 8 is a longitudinal sectional view showing a DD section of FIG. FIG. 3 shows a cross section of a water passage section 2 provided so as to cross a concrete wall 18 forming a water impervious retaining wall 100 and a crushing section 10 housed inside both ends of the water passage section. The water passage section 2 is a hollow closed main body section 3 made of a conductive metal. Inside the main body section 3, an electrode 4 held by an electrode support member 4a made of an insulating material is broken down by electrolytic corrosion and penetrates. It is arranged at a position close to the through portion 7 forming the passage hole 1, and the hollow portion is filled with a gap filler 6 such as crushed stone having a water-permeable gap. An electric wire 13b inserted through the electrolyte solution supply pipe 8 is connected to the electrode 4 via a connection terminal 14b. The inner walls other than the penetrating portions 7 at both ends of the main body portion 3 are provided with an insulating layer 9 made of an insulating paint or the like to prevent electrolytic corrosion. When applying a voltage to the electrodes, a DC power supply 13
Is connected to the connection terminal 14 of the steel sheet pile 16 by the electric wire 13a.
This is done by connecting to a.

In the above-described four embodiments, the water passage portion 2 forming the water passage hole 1 has a steel sheet pile 15,
Steel pipe sheet pile 16, H-shaped steel 17 for pile core material of soil cement wall
a, or the reinforcing bars 18a and 18b, which are reinforcing members for the reinforced concrete wall 18, can be installed underground. For this reason, the work of the construction process of the conventional water-impervious retaining wall 100 can proceed without delay.

The water passage section 2 is provided with a water-impervious retaining wall 1.
At the time of construction of 00, the underground structure 110c is closed in order to block the underground water, thereby making it possible to construct the underground structure 110c in a water-blocked state.

Next, the operation of forming the water passage hole 1 in the retaining wall having the underground water flow preservation function of the present invention will be described. At any time when the groundwater flow is desired to be preserved, first, an electrolyte solution 5 such as salt water is filled into the water passage section 2 through the electrolyte solution supply pipe 8 from the electrolyte solution supply port 8a. Next, the anode of the DC power supply 13 is connected to the connection terminal 14a, and the cathode is connected to the electric wire 13a.
b, and a voltage is applied to the electrode 4 provided inside the water passage section 2. A current flows through the electrolyte solution between the cathode electrode 4 and the water passage 2 to which the opposite anode is connected, and the penetration portion 7 is electrolytically eroded to break through. According to this method, the surface 1
The water passage hole 1 can be formed at any time from the cut-out flooring surface 50 to the underground water passage 2 at 50.

Further, the crushing section 10 expands due to a hydration reaction with the electrolyte solution from the water-passing section 2 that has been broken and penetrated, and crushes the soil mortar 17 b or the concrete 18 c solidified on the soil mortar wall 17 or the reinforced concrete wall 18. The water passage hole 1 is formed.

Next, the method for constructing the retaining wall of the present invention will be described in detail.

According to an eleventh aspect of the present invention, the water passage hole 1 is disposed on the water-impervious retaining wall 100 at a position deeper than the flooring 107 of the excavated underground excavation structure 110c. At any time after the construction of the structure 110c, the water passage portion 2 is destroyed and penetrated to form the water passage hole 1, thereby preserving the flow of the groundwater flow 160 blocked by the impermeable retaining wall 100. According to this method, it is possible to restore the groundwater flow at a position deeper than the excavated portion, which was impossible in the past.

According to a twelfth aspect of the present invention, the water passage hole 1 is disposed on the side wall or the upper part of the water-impervious mountain retaining wall 100 of the underground excavated structure 110c, and the water is passed at any time during the construction. A water passage hole 1 is formed by breaking and penetrating the portion 2, and the groundwater flow 160 interrupted by the water-blocking retaining wall 100 by connecting the upstream and downstream water passages with the water pipe 30. Conserve water flow. According to this construction method, water can be restored during construction of the underground building. For this reason, the influence and damage due to the interruption of the groundwater flow can be minimized.

According to a construction method of a mountain retaining wall according to claim 13, the water passage hole 1 is provided in the water passage portion 2 of the water-impervious mountain retaining wall 100 on the side surface or upper portion of the underground excavation structure 110c, At any time after construction and backfill ground restoration,
A water passage hole 1 is formed by breaking and penetrating the water passage portion 2, and the groundwater flow blocked by the water-blocking retaining wall 100 is maintained. According to this method, the groundwater flow in the ground can be restored after the restoration of the above-ground part even at a site where restoration of the above-ground part is urgent such as traffic interruption.

FIG. 9 is a schematic diagram showing a state of restoration of the groundwater flow after the construction of the impermeable mountain retaining wall 100 having the function of maintaining the groundwater flow according to the present invention.

During construction, the underground structure 110c is constructed in a state where the water is impervious by the impermeable mountain retaining wall 100, and the upper part of the excavated structure is backfilled. As shown in the figure, the inside of the temporary wall 1 in contact with the permeable layer 105a has
The groundwater flow 106a is restored by arranging 0 and backfilling.

Further, according to the present invention, the groundwater flow 106b can be restored by destroying the temporary wall portion 1 in contact with the permeable layer 105b deeper than the flooring 107.

[0049]

According to the water-impervious retaining wall having the underground water flow preservation function of the present invention, after the construction of the underground building, the water flow of the water-impervious retaining wall provided in the permeable layer can be easily restored together with the backfilling process. Can be done. In particular, it is possible to easily and economically restore a deep groundwater flow deeper than the floor.

According to the construction method of the retaining wall of the eleventh aspect, it is possible to restore the groundwater flow at a position deeper than the excavated portion, which was impossible in the past.

According to the method for constructing the retaining wall according to the twelfth aspect, water can be restored during the construction of the underground building. For this reason, the influence and damage due to the interruption of the groundwater flow can be minimized.

According to the construction method of the retaining wall according to the thirteenth aspect, the groundwater flow in the ground can be restored after the restoration of the above-ground portion even at a site where restoration of the above-ground portion is urgent, such as traffic interruption.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a retaining wall having a groundwater flow preservation function of the present invention using a steel sheet pile.

FIG. 2 is a cross-sectional view showing a cross section taken along line AA of FIG.

FIG. 3 is a plan view showing one embodiment of a retaining wall having a groundwater flow preservation function of the present invention using a steel pipe sheet pile.

FIG. 4 is a longitudinal sectional view showing a BB section of FIG. 3;

FIG. 5 is a plan view showing an embodiment of a retaining wall having a groundwater flow preservation function of the present invention using soil cement.

6 is a longitudinal sectional view showing a section taken along line CC of FIG. 5;

FIG. 7 is a plan view showing an embodiment of a retaining wall having a groundwater flow preserving function of the present invention using reinforced concrete.

FIG. 8 is a longitudinal sectional view showing a DD section of FIG. 7;

FIG. 9 is a schematic diagram showing a state of restoration of a groundwater flow after construction of a retaining wall having a groundwater flow preservation function of the present invention.

FIG. 10 is a schematic diagram showing a state in which a groundwater flow is blocked by a water-blocking mountain retaining wall.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Water passage hole 2 Water passage part 3 Main part 3a Upper plate 3b Wire mesh 3c Lower plate 3d Side plate 4 Electrode 4a Electrode support member 5 Electrolyte solution 6 Gap filling 7 Penetration part (penetration part by breakage by electrolytic corrosion and penetration part by crushing) Reference Signs List 8 electrolyte solution supply pipe 8a electrolyte solution supply port 8b valve 9 insulating layer 10 crushing part 10a square frame 10b waterproof cover 11 expansive crushed material packaging 13 DC power supply 13a, 13b electric wire 14a, 14b connection terminal 15 steel sheet pile 15a connection part 16 Steel pipe sheet pile 16a Connecting portion 17 Soil mortar wall 17a H-section steel 17b Soil mortar 18 Reinforced concrete wall 18a, 18b Reinforcing bar (main bar, hoop bar) 100, 100a, 100b Waterproof soil retaining wall 105a, b Water permeable layer 106a, b Water permeable layer 107 Flooring 110a, b Building 110c Underground Building 120 Door 130a, b trees 150a, b surface 160a, b groundwater flow

Continued on the front page (72) Inventor Eiji Hayashi 2nd Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. F-term (reference) 2D049 EA01 EA02 EA08 EA15 FB03 FB12 FB14 GB01 GB05 GC01 GC11 GD03 GE03 GE11 GG05

Claims (13)

[Claims] 1. A water-impervious retaining wall constructed for the construction of an underground excavation structure, wherein a water passage hole is formed in a portion corresponding to the groundwater flow to allow the groundwater flow to pass at any time. A retaining wall having a groundwater flow preservation function. 2. The retaining yard having a groundwater flow preserving function according to claim 1, wherein the water-impervious retaining wall is made of a steel sheet pile having the water passage hole at an arbitrary depth where the groundwater flow is blocked. wall. 3. A retaining yard having a groundwater flow preserving function according to claim 1, wherein said water-impervious retaining retaining wall is made of a steel pipe sheet pile having said water passage hole at an arbitrary depth portion for blocking a groundwater flow. wall. 4. The groundwater flow retaining function according to claim 1, wherein the water-impervious retaining wall is a soil mortar wall provided with the water passage hole at an arbitrary depth where the groundwater flow is blocked. Mountain retaining wall. 5. The retaining wall having a groundwater flow preserving function according to claim 1, wherein the water-impervious retaining wall is made of a reinforced concrete wall having the water passage hole at an arbitrary depth where the groundwater flow is blocked. . 6. The water passage hole includes a closed water passage portion, wherein the water passage portion includes a main body made of a hollow conductive metal,
One or more electrodes provided near the inner wall in the main body, and an electrolyte solution and a gap filling material are filled in the main body,
A voltage is applied to the electrode at any time to embrittle the wall surface of the main body by electrolytic corrosion to form a water passage hole through which the groundwater flow can pass through by breaking. A retaining wall having a groundwater flow preservation function as described. 7. The retaining wall having a groundwater flow preserving function according to claim 1, wherein the water passage is connected to an electrolyte solution supply pipe. 8. The water passage section, wherein an inner wall other than the electrolytic corrosion section near the electrode is covered with an insulating layer.
7. The impermeable mountain retaining wall having the function of maintaining groundwater flow according to any one of 3 to 7 above. 9. The water passage hole according to claim 4, wherein the water passage hole expands due to a hydration reaction between the electrolyte solution leaking from the water passage portion that has been broken and penetrated and the expansible crushable material, and a mountain retaining wall around the water passage portion. The crushing part which crushes the soil mortar or concrete which forms the said, and forms the water flow hole which a groundwater flow can pass is further provided, The crushing part in any one of Claim 1, 4, 5, 6, 7 or 8 characterized by the above-mentioned. Retaining wall with groundwater flow protection function. 10. A retaining wall which is constructed so as to cut off the ground for an underground excavation structure, constructs an underground excavation structure, and thereafter forms a water passage hole for passing a groundwater flow. Construction method. 11. The water passage hole is a water-permeable portion of a water-impervious retaining wall portion at a position deeper than a flooring of an excavated underground excavation structure, and at any time after construction of the underground excavation structure. The method for constructing a retaining wall according to claim 10, wherein a water passage hole is formed by breaking and penetrating a water-passing portion to maintain the flow of groundwater flow interrupted by the impermeable retaining wall. 12. The water passage hole is a water passage part of a water-impervious retaining wall part on a side surface or an upper part of an underground excavation structure,
At any time during construction, the water passage was destroyed and penetrated to form a water passage hole, and the upstream and downstream water passages of the groundwater flow were connected by connecting pipes, which were interrupted by the impermeable mountain retaining wall 11. The underground water flow is maintained.
Construction method of the retaining wall described. 13. The water passage hole is a water passage part of a water-impervious retaining wall part on a side surface or an upper part of an underground excavation structure,
At any time after the construction and backfilling of the underground excavation structure and at the time of restoration from the ground, water penetration holes are formed by destroying and penetrating the water flow section, and the groundwater flow blocked by the impermeable mountain retaining wall is to be preserved. The construction method of a retaining wall according to claim 10, wherein: