JPS63130818A - Cut-off wall construction work - Google Patents

Abstract

PURPOSE:To raise the water-stopping performance of a wall as well as detect and prevent the leak of stored substances by a method in which a water- impermeable film bag with arranged compartments is inserted into an excavated trench, and a backfilling or filling material is charged into the compartments. 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 synthetic resin or rubber water-impermeable film 3 having partition films provided at an adequate interval on the inside of its sidelong bottomed double belted film 31 is inserted into the stabilizer liquid 2 in the trench 1. A backfilling or filling material 4 is charged into the compartments and a monitoring device 5, e.g., pipe, etc., suitable to observation of water level and sampling of water is buried. The deterioration and loss of the stabilizer liquid can thus be suppressed, and water-stopping performance of the cut-off wall can be raised. The leak of stored substances can be easily detected and 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 the stabilizing liquid used to stabilize the JlI wall during excavation, or impermeable membrane materials are used as impermeable walls. There is.

``Problems to be Solved by the Invention'' However, with the exception of water-impermeable membrane materials, the presence of sylinds at joints is unavoidable during construction; It is not possible to be completely watertight, and if a water-impermeable membrane material is used, there is a possibility of partial failure, which is very similar.

Furthermore, when it comes to water leakage or seepage from the leakage points or damaged parts of the water-impermeable membrane material, it is difficult to grasp the occurrence of these phenomena themselves, and in most cases, it is difficult to identify the occurrence point in practical use. 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 stoppage performance, prevent leakage of substances to be stored or disposed of, detect water leakage and leakage of harmful substances, and detect water leakage and harmful substances. This is intended to enable measures to prevent leakage of substances, etc.

"Means for Solving the Problems" The present invention involves inserting a water-impermeable membrane material in which bag-shaped compartments are arranged into an excavated trench, and filling each compartment of the impermeable water-permeable membrane material with backfilling material or filling material. It consists in inputting materials.

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

``Example'' The drawings show an example of the present invention, and FIGS. 1 to 2 show steps.

1. The ground on which a water wall is constructed is generally composed of highly permeable soil such as sand or gravel, or is sandwiched between strata composed of such soil. In such ground, an excavation trench l of a predetermined depth is excavated and, at the same time, a stabilizing liquid 2 such as bentonite slurry is filled in order to stably hold the trench wall.

(2) Next, the water-impermeable membrane material 3 is inserted into the stable liquid in the trench 11JII. This water-impermeable membrane material 3 is shown in FIGS.
As shown in the figure, partitions 1132, .

As the material for forming the water-impermeable membrane material 3, sheets of various synthetic resins, rubber, cloth, etc. are used.

■Subsequently, each compartment 33 of the water-impermeable membrane material 3...
The backfilling material or filling material 4 is thrown into the inside. As the filling material, use a water-permeable material such as sand or gravel.

■ Monitoring equipment 5 such as pipes suitable for water level observation and water sampling when inserting the backfilling material or filling material 4
bury it and fill it sufficiently to complete the water-blocking wall A.

Note that the shape of the unfortunate water-based membrane material 3 is not limited to that shown in FIGS. 2 and 3; for example, a cylindrical partition membrane may be provided. ,
Natural dropping using a chute or forced feeding using air pressure, etc., is possible.

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

+11 Even if a stabilizing liquid is used in an excavated trench, the backfilling material or filling material does not come into direct contact with the stabilizing liquid, so deterioration of the stabilizing liquid can be kept to a low level, and the stabilizing liquid can be used again. I can do it.

(2) Not only the stabilizing liquid but also ground water will not mix with the backfilling material or filling material, and therefore a homogeneous and stable impermeable wall can be constructed, and the stabilizing liquid will not mix with the backfilling material. You can prevent loss by not getting caught inside.

(3) By installing equipment such as pipes suitable for monitoring purposes such as water level observation and water sampling in the backfilling material or filling material of each compartment, water leakage and leakage of harmful substances, etc. in each compartment can be prevented. can detect the occurrence of

Specifically, water leakage can be detected by monitoring the internal water level by preventing rainwater from flowing into the backfilling material or the filling material, and also by preventing the internal water, backfilling material, or filling material from flowing into the material. Leakage of hazardous substances can be easily detected by sampling and analyzing a sample.

(4) In the event of water leakage or leakage of hazardous substances, etc., preventive measures can be taken individually for the relevant compartment, making it more economical and effective than when the location of the leakage is unknown. can be taken. In particular, when a general chemical injection method is used as a preventive measure, the chemical can be effectively injected into the target compartment and can be prevented from escaping outside the target area.

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

[Brief explanation of the drawing]

The drawings show examples of the present invention; FIGS. 1 to 3 are process explanatory diagrams, FIG. 2 is a plan view of a water-blocking wall, and FIG. 3 is a perspective view of a water-impermeable membrane material. A... Waterproof wall l... Excavation groove 2... Stabilizing liquid 3... Impermeable membrane material 4... Backfilling material or filling material 5... Monitoring equipment 31... Yes Bottom double membrane 32... Partition model 33.
...Division room diagram 2 3゜≧5

Claims (1)

[Claims] A water-impermeable membrane material with bag-shaped compartments arranged in an arrangement is inserted into the excavated trench, and backfilling material or filling material is put into each compartment of the impermeable membrane material to construct a water-blocking wall. A characteristic water-blocking wall construction method.