JP3427369B2 - Construction method of permeable underground wall - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art When a continuous underground wall is installed in a long underground section, the flow of groundwater is interrupted, causing problems such as root rot of the standing tree and flooding of the basement on the upstream side, and well drenching and ground subsidence on the downstream side. There is a case. To solve this problem,
There is a method to install double pipes inside and outside the continuous underground wall.

A description will be given below with reference to the drawings. FIG. 4 is a side sectional view showing a state in which the inner and outer double pipes are installed in the continuous underground wall. Conventionally, the outer pipe A and the inner pipe B were installed in the continuous underground wall,
There is a method in which a water permeable mat C is attached to the end of the mat to allow the ground water on the back surface of the continuous underground wall to pass. The inner and outer double pipes B and A are configured to be slidable with each other, and when the concrete D is placed on the continuous underground wall, in order to prevent the concrete D from wrapping around inside the double pipe, the structure is slid and closely adhered to the excavation groove surface. There is. A water blocking ring (O ring) E is installed to prevent cement paste or the like from entering from the joint portion of the double pipe.

However, in the above-mentioned conventional method, there are problems that the sliding of the inner and outer double tubes is restricted due to the frictional resistance of the water blocking ring, and the water permeable mat is clogged so that water cannot be passed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and is a continuous water-permeable material for passing groundwater on the back surface of a continuous underground wall by a simple method. The purpose is to provide a method of constructing an underground wall.

[0006]

[Means for Solving the Problems] A method of constructing a continuous underground wall for constructing a continuous underground wall and then allowing the passage of groundwater to the rear surface of the continuous underground wall, wherein Pre-installed in the thickness direction of the rebar cage, remove the blockage at one end of the sheath tube and attach the nipple, then remove the blockage at the other end of the sheath tube, insert the inner tube into the sheath tube, then in the nipple, A method for constructing a water-permeable continuous underground wall, characterized in that a valve having a lid is attached and closed, and the valve lid is energized for a certain period of time to melt. Further, in the method for constructing a water-permeable continuous underground wall, both ends of the sheath pipe are sheath pipes which are previously closed by a steel plate and a thin steel plate. In addition, the inner pipe is a method for constructing a continuous underground wall having water permeability, wherein wire mesh is installed at both ends and a filter material is filled inside the inner pipe. Furthermore, in the method for constructing a water-permeable continuous underground wall, the valve lid is made of a soluble metal material for the anode and the counter electrode.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<A> Overall Configuration FIG. 1 is a side sectional view of a continuous water permeable underground wall 1 according to the present invention. The sheath tube 2 with both ends closed is installed in advance in the thickness direction of the reinforcing bar cage 3 of the continuous underground wall, and one end of the sheath tube 2 is closed when a structure is constructed in the internal space surrounded by the continuous underground wall. After the nipple 4 is attached and the nipple 4 is attached, the blockage at the other end of the sheath tube 2 is removed, the inner tube 5 is inserted into the sheath tube 2, and then the valve 6 is attached to the nipple 4.
Is attached and closed, and the lid 7 of the valve 6 is energized and melted for a certain period of time to construct a continuous water-permeable underground wall.

<B> Sheath Pipe FIG. 2 is a side sectional view showing a state in which the sheath pipe 2 is installed in the rebar cage 3 of the continuous underground wall. Both ends of the sheath tube 2 are previously closed by, for example, a steel plate 21 and a thin steel plate 22. The sheath tube 2 guides and protects the inner tube 5 described later when it is inserted. The steel plates 21 and the thin steel plates 22 at both ends prevent the excavated earth and sand from entering the sheath pipe 2 during the excavation work of the continuous underground wall.

<C> Nipple In FIG. 3, the steel plate 21 at one end of the sheath tube 2 is removed, and the nipple 4 is removed.
It is a sectional side view which shows the state which attached. The nipple 4 is a well-known joint pipe having threads on its periphery, and is attached to the outer peripheral portion of the steel plate 21 by welding or the like.

<D> Inner pipe The inner pipe 5 penetrates the inside of the nipple 4 and the sheath pipe 2, and the ground side M
Is a steel pipe that reaches. Wire mesh is installed at both ends of the inner pipe 5, and the inside of the inner pipe 5 is filled with a filter material 8. (FIG. 1) As the filter material 8, a known material having water permeability may be used. Therefore, the intrusion of earth and sand from the ground side M is prevented, and the inflow and drainage of groundwater from the ground side M are performed.

<V> Valve The valve 6 is a known one which is attached to the nipple 4. (FIG. 1) The lid 7 of the valve 6 is made of a soluble metal material (for example, a zinc alloy, a magnesium alloy, etc.) for the anode and the counter electrode, and is melted by energization for a certain period.

[0013]

The method of constructing a continuous continuous underground wall according to the present invention will be described below.

<A> Attaching the sheath pipe and installing the rebar cage When the rebar cage 3 is installed by excavating the ground in FIG. 2, the length direction of the sheath pipe 2 is aligned with the thickness direction of the rebar cage 3. Installation,
Fix it. Both ends of the sheath pipe 2 are previously closed by, for example, a steel plate 21 and a thin steel plate 22, and the steel plate 21 is attached to the excavation side L and the thin steel plate 22 is attached to a predetermined position in the rebar cage 3 toward the natural ground side M.

<B> Concrete pouring, nipple mounting, inner pipe insertion / driving In FIG. 3, concrete D of the continuous underground wall is poured,
After the sheath tube 2 in the rebar cage 3 is fixed, the excavation side L is excavated. Next, the concrete D surface of the steel plate 21 portion at the end of the sheath tube 2 is removed, and the central portion is cut and removed leaving the periphery of the steel plate 21. The nipple 4 is welded and attached to the periphery of the steel plate 21.
The inner tube 5 is inserted into the sheath tube 2, and the tip of the inner tube 5 is a thin steel plate 2.
When it hits 2, the inner pipe 5 is driven in and the thin steel plate 22 is pierced to penetrate into the natural side M.

<C> When the valve is attached and closed, the tip of the inner tube 5 pierces the thin steel plate 22 and penetrates into the natural side M, and the wire mesh installed at the tip of the inner tube 5 and the filter material filled in the inner tube 5 Groundwater on the natural side M that has passed through 8 flows out toward the excavation side L. After confirming the outflow of groundwater, the valve 6 is attached to the thread of the nipple 4 and the lid 7 is closed. (Fig. 1)

<D> Energization and connection The energizing wire 10 is connected to the lid 7 of the melting valve 6 and the anticorrosion body 9 installed on the ground to energize. The lid 7 is made of a soluble metal material (for example, a zinc alloy, a magnesium alloy, etc.) for the anode and the counter electrode, and is gradually melted by energization with an anticorrosion body 9 installed on the ground for a certain period. After the construction of the structure of the internal space surrounded by the continuous underground wall is completed and the excavation side L is backfilled, the energizing wire 10 is energized to melt the lid 7. Lid 7
The groundwater on the natural side M flows into the excavation side L after passing through the inner pipe 5 due to the dissolution of the groundwater. Therefore, the continuous underground wall becomes the water-permeable continuous underground wall 1, and the groundwater that has stagnated behind it. You can avoid the interruption of.

[0018]

Since the present invention is as described above,
The following effects can be obtained. <B> It is possible to avoid the interruption of groundwater that was trapped behind the continuous underground wall. <B> Since the lid of the valve is gradually dissolved by the passage of electricity to the body to be protected after a certain period of time, it is possible to easily remove the groundwater on the back surface of the continuous underground wall. <C> The inner pipe removes dirt by the wire mesh at both ends and the filter material inside, so that the flow of groundwater through the inner pipe can be made smooth. <D> The sheath tube can be attached easily because it is installed before the rebar cage is installed. <E> Since both ends of the sheath pipe are closed by steel plates and thin steel plates, concrete is prevented from entering the inside of the sheath pipe when pouring concrete on the continuous underground wall, and the inner pipe can be easily inserted. You can do it.

[Brief description of drawings]

FIG. 1 is a side sectional view of a water-permeable continuous underground wall according to the present invention.

FIG. 2 is a side sectional view showing a state in which a sheath pipe is installed in a rebar cage.

FIG. 3 is a side sectional view showing a state in which a nipple is attached.

FIG. 4 is a side sectional view showing a conventional example in which inner and outer double pipes are installed in a continuous underground wall.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 5/20 101-102 E02D 5/18 101-102

Claims (4)

(57) [Claims] 1. A method for constructing a continuous underground wall for constructing a continuous underground wall and then allowing the passage of groundwater to the rear surface thereof, wherein a sheath pipe having both ends closed is provided in a reinforcing bar cage of the continuous underground wall. Installed in the thickness direction beforehand, remove the blockage at one end of the sheath tube and attach the nipple, then remove the blockage at the other end of the sheath tube, insert the inner tube into the sheath tube, and then equip the nipple with a lid. A method of constructing a continuous underground wall with water permeability, characterized in that the valve is attached and closed, and the lid of the valve is energized and melted for a certain period of time. 2. The method for constructing a continuous water-permeable underground wall according to claim 1, wherein both ends of the sheath pipe are sheath pipes previously closed by a steel plate and a thin steel plate. How to build a continuous underground wall. 3. The method for constructing a water-permeable continuous underground wall according to claim 1, wherein the inner pipe is provided with wire mesh at both ends, and the inner pipe is filled with a filter material. Construction method of continuous underground wall with water permeability. 4. The method for constructing a water-permeable continuous underground wall according to claim 1, wherein the valve lid is made of a soluble metal material for the anode and the counter electrode. How to build.