JPS63130819A - Cut-off wall construction work - Google Patents

Abstract

PURPOSE:To prevent the leakage of substances by raising the water-stopping property of a cut-off wall by a method in which a bottomed belted double film having a water impermeability is continuously inserted into an excavated trench, and a filler is charged into the double film. CONSTITUTION:A preset depth of trench 1 is excavated, and a stabilizer liquid 2, e.g., bentonite mud water, etc., is packed into the trench 1. A water- impermeable bottomed and belted double film 3 is continuously inserted into the liquid 2, and a filler 4 composed of a hydraulic or water absorptive swelling material is charged into the film 3 to a sufficient extent. The water-stopping property can thus be raised and can also be kept high since the filler 4 hardens or swells even when the cut-off film is partly broken. The leakage of substance can be exactly prevented and the deterioration and loss of the stabilizer liquid 2 can be prevented.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a water-blocking wall construction method using a water-impermeable membrane material.

``Conventional technology'' Sheet piles and fill piles are currently being used as measures to construct underground/underground structures, to stop underground/groundwater such as river leakage, and to prevent leakage of hazardous substances from industrial waste processing sites. Column walls, underground continuous walls, underground walls made by solidifying stabilizing liquid used to stabilize trench walls during excavation, or water-impermeable membrane materials are used as impermeable walls.

``Problems to be solved by the invention'' However, with the exception of water-impermeable membrane materials, the presence of sillage at the joint is unavoidable during construction, and as a problem in terms of construction accuracy, the presence of sillage at the joint is It is impossible to make the membrane completely watertight, and if an unfavorable water-based membrane material is used, there is a possibility of partial failure, which is very similar.

Furthermore, when it comes to water leakage from joints or damaged parts of water-impermeable membrane materials, it is difficult to grasp the occurrence of these phenomena themselves, and in most cases, it is difficult to identify the location where they occur. It is difficult to limit and detect the range with reasonable accuracy.

Therefore, the present invention aims to eliminate these conventional drawbacks, and aims to improve water-stopping properties and appropriately prevent leakage of substances to be stored or disposed of.

"Means for Solving the Problems" The present invention involves continuously inserting a belt-shaped bottomed double membrane made of an impermeable membrane material into an excavation trench, and inserting a hydraulic material inside the bottomed double membrane. Alternatively, a water-blocking wall can be built by inserting a filling material made of water-absorbing and swelling material.

``Action'' With the above structure, it is possible to achieve the intended purpose.

The drawings show an embodiment of the present invention, and FIG. 1 (1) to (2) show the steps.

■The geological strata for which ice walls are constructed are generally composed of highly permeable soil such as sand and gravel, or are sandwiched between strata composed of such soil. At the same time as excavating an excavated trench 1 to a predetermined depth, a stabilizing liquid 2 such as bentonite slurry is filled in order to stably hold the trench wall.

(6) Next, a belt-shaped bottomed duplex 1m13 made of a water-impermeable membrane material is continuously inserted into the stable liquid in the excavated groove 1. This bottomed double membrane 3 connects the tip and the end, for example, as shown in FIGS. 3 and 4.

Materials for forming the bottomed double membrane 3 include various synthetic resins,
Use a sheet of rubber, cloth, etc.

(2) Subsequently, a filling material 4 made of a hydraulic material or a water-absorbing and swelling material is placed inside the bottom double membrane 3 marked with -F. As the hydraulic material, a material made from cement-based material, coal ash, blast furnace slag, etc. is used, and as the water-absorbing and swelling material, bentonite or a mixed material made from bentonite is used. If such a filling material is used, as shown in Fig. 2, even if a defective part a occurs in the bottomed double membrane 3, that is, a water-blocking membrane, and water leaks, the filling material will prevent water from leaking. It absorbs water, hardens or swells, and creates an impermeable gel-like waterproof wall.

(2) Complete filling with the filling material 4 to complete the water-blocking wall A.

Note that the shape of the water-shielding wall A and therefore the bottomed double membrane 3 is
The figures are not limited to those shown in FIG. 4, and may be appropriate depending on the required site.

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

111il! The water film is double layered, and there is a layer of filling material in between, and these can be made into a series, so water-stopping properties can be improved. Even if water grows, the filling material made of hydraulic material or water-absorbing and swelling material absorbs water and hardens or swells, creating a water-impermeable gel-like waterproof wall and ensuring high water-stopping properties. Therefore, water leakage and leakage of substances to be stored or disposed of can be accurately prevented, and there is no need for detection means or subsequent preventive measures for water leakage/leakage.

(2) Even if a stabilizing liquid is used in an excavated trench, the filling material does not come into direct contact with the stabilizing liquid (and the deterioration of the stabilizing liquid can be suppressed, and the stabilizing liquid can be used again). I can do it.

(3) Not only the stabilizing liquid, but also ground water will not mix with the filling material, so a homogeneous and stable impermeable wall can be constructed, and loss of the stabilizing liquid can be prevented.

(4) Applicable fields include: i) Disposal of substances that are hazardous to the environment, areas within or around the disposal site where leakage of hazardous substances due to groundwater or rainfall is a problem; ii) Storage of radioactive materials. , treatment, and disposal sites iii) Other locations require the installation of water-blocking walls with high water-stopping properties.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. JI~■ is
FIG. 2 is an explanatory diagram of the main part, FIG. 3 is a plan view of the impermeable wall, and FIG. 4 is a perspective view of the bottomed double membrane. A... Waterproof wall 1... Excavation groove 2... Stabilizing liquid 3... Bottomed double membrane 4... Filling material

Claims (1)

[Claims] Continuously inserting a belt-shaped bottomed double membrane made of a water-impermeable membrane material into an excavated trench, and inserting a filling material made of a hydraulic material or a water-absorbing swellable material inside the bottomed double membrane, A water-shielding wall construction method characterized by constructing a water-shielding wall.