JPH0781264B2 - Impermeable wall construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an impermeable wall construction method using an impermeable membrane material.

“Conventional technology” Currently, sheet piles and soil pile pillars are used as countermeasures such as construction of underground and underground structures and water leakage in underground and groundwater such as river leakage, and prevention of leakage of harmful substances from industrial waste disposal sites. A row wall, a continuous underground wall, an underground wall formed by solidifying a stabilizing liquid used for stabilizing a trench wall during excavation, or an impermeable membrane material is used as the impermeable wall.

"Problems to be solved by the invention" However, except for the water-impermeable membrane material, it is unavoidable that there is a joint at the joint in terms of construction. It is not possible to make it completely watertight, and if a water-impermeable membrane material is used, it may be partially damaged, and this is very similar.

Also, regarding water leakage and leakage from this joint part or the damaged part of the impermeable membrane material, it is difficult to grasp the occurrence itself of those phenomena, and in most cases, the occurrence location is practical. Limit the range with accuracy,
It is difficult to detect.

Therefore, the present invention is intended to eliminate such conventional drawbacks, and is intended to improve water blocking performance and appropriately prevent leakage of a substance to be stored or disposed.

"Means for Solving Problems" The present invention is to insert a strip-shaped bottomed double membrane made of an impermeable membrane material into an excavation groove continuously, and a hydraulic material inside the bottomed double membrane. Alternatively, a water-impermeable wall is constructed by introducing a filling material made of a water-swelling material.

With the above-mentioned structure of "action", the intended purpose can be achieved.

[Examples] The drawings are examples of the present invention, and FIGS. 1 to IV show steps.

I. The ground targeted for the construction of impermeable walls is generally composed of highly permeable sand, gravel, or other such soil material, or a stratum composed of such soil material is sandwiched between them. At the same time as excavating the excavation groove 1 at the planned depth in the ground, a stabilizing solution 2 such as bentonite muddy water is filled in order to stably hold the groove wall.

II. Next, the strip-shaped bottomed double membrane 3 made of an impermeable membrane material is continuously inserted into the stable liquid in the excavation trench 1. This bottomed double membrane 3 is, for example, as shown in FIG. 3 and FIG.
Connect the tip and end.

As a material for forming the bottomed double film 3, various synthetic resins,
A sheet of rubber or cloth is used.

III. Subsequently, the filling material 4 made of a hydraulic material or a water-swellable material is delivered to the inside of the bottomed double membrane 3. As the hydraulic material, cement-based materials, coal ash, materials made from blast furnace slag, etc. as raw materials, and as the water-swellable material,
Bentonite or a mixed material containing bentonite as a raw material is used. If such a filling material is used, as shown in FIG.
Even if a water leak occurs, the filling material absorbs the water,
It also hardens or swells and creates a waterproof house b in the form of an impermeable gel.

IV. Fill the filling material 4 sufficiently to finish, and complete the impermeable wall A.

The shape of the impermeable wall A and thus the bottomed double membrane 3 is the third
It is not limited to the drawings and FIG. 4, but may be appropriate depending on the required site.

"Effects of the Invention" According to the present invention, the following effects are achieved.

(1) Since the water-blocking film is doubled and there is a layer of filling material between them, and these can be made into a series, the water-stopping property can be improved, and by any chance Even if a defect occurs in the part, the filling material of the hydraulic material or the water-swelling material absorbs water leakage and hardens or swells, creating a waterproof wall in the form of an impermeable gel and ensuring high waterproofness. . Therefore, it is possible to appropriately prevent leakage of water or leakage of a substance to be stored or disposed of, and there is no need for detection means for leakage or leakage and subsequent preventive measures.

(2) Even if the stabilizing solution is used for the excavation trench, the filling material does not directly contact the stabilizing solution, deterioration of the stabilizing solution can be suppressed to a low level, and the stabilizing solution can be reused. .

(3) Not only the stabilizing solution but also groundwater is not mixed in the filling material, so that a homogeneous and stable impermeable wall can be constructed and the loss of the stabilizing solution can be prevented.

(4) Applicable fields are: i) Disposal of harmful substances for environmental conservation, locations where leakage of harmful substances due to groundwater, rainfall, etc. becomes a problem inside or outside the disposal site ii) Storage of radioactive substances , Treatment and disposal sites iii) Other places where it is required to install impermeable walls with high water-blocking properties.

[Brief description of drawings]

The drawings are embodiments of the present invention, and FIGS. 1 to IV are process explanatory views, FIG. 2 is an explanatory view of main parts, FIG. 3 is a plan view of an impermeable wall, and FIG. It is a perspective view of a bottom double membrane. A: water-blocking wall, 1 ... excavation trench, 2 ... stabilizing solution, 3 ... bottomed double membrane, 4 ... filling material

Claims (1)

[Claims] 1. A strip-shaped bottomed double membrane made of an impermeable membrane material is continuously inserted into an excavation trench, and a filling material made of a hydraulic material or a water-swellable material is placed inside the bottomed double membrane. The impermeable wall construction method, which is characterized by putting in materials and constructing impermeable walls.