JPH051847B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a method for laying a water-blocking sheet provided in a waste treatment plant to prevent leachate.

<<Prior Art>> As is well known, landfill processing as the final disposal of waste is carried out by excavating depressions in mountainous areas, inland areas, etc.

In this type of treatment plant, if leachate from normal waste is left unattended, it can cause secondary pollution such as contamination of the ground and underground water. A synthetic resin water-blocking sheet will be laid to cover the area.

It seems easy to lay a water-shielding sheet, for example, by rolling it up and transporting it to the construction site of the treatment plant and rolling it out inside the recess. However, in large-scale treatment plants, it is necessary to The covering sheet also has a large area, making it difficult to cover this area with a single water-blocking sheet.

Therefore, for example, as seen in Japanese Patent Application Laid-Open No. 56-69119, connectors that fit together with each other in a zipper structure are provided at the ends of the water-shielding sheets, and multiple sheets are connected at the construction site of the treatment plant. A method of installing it has also been proposed.

<<Problems to be Solved by the Invention>> However, the method disclosed in the above publication also had the following problems.

That is, for example, when the groundwater level at a construction site of a treatment plant is high or when a relatively deep excavation is made, groundwater intrudes into the depression.

In this case, in the method of the above-mentioned publication, water-tightness is ensured by covering the upper part of the connector with a wing and heat-sealing the wing and the sheet, so although the connectors can be connected to each other, It was not possible to ensure water-tightness.

This invention was made in view of the above-mentioned problems, and its purpose is to provide a water-blocking sheet that can be constructed in a state where groundwater has invaded a waste treatment plant and that can provide sufficient water-stopping properties. The purpose is to provide an installation method.

《Means for solving the problem》 In a method of laying a water-shielding sheet covering the entire surface of a waste disposal site that has been excavated into a concave shape, the water-shielding sheet is divided into a plurality of parts, and a bifurcated shape is installed at each end. A branch part is provided, and a connecting connector extending along the branch part is attached to each end of the branch part, and these water-blocking sheets are placed in the cut-out part so that the branch parts face each other and the connectors are close to each other. the connectors are fitted together to connect the branches, and grout is injected into the joint defined by the adjacent branches.

<<Operation>> When the water-shielding sheets are arranged so that the branch parts face each other and the connectors are close to each other, the water-shielding sheets sink under their own weight in the groundwater.

In addition, the grout injected into the joint that connects the adjacent bifurcated branches penetrates to the mating part of the connector, and when it hardens, it fixes the mating of the connector, and also connects the water-shielding sheet. Ensure that the area is watertight.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of the method for laying a water-blocking sheet in a waste disposal plant according to the present invention.

The installation method shown in the figure includes, as shown in Figure 1,
This is applied when constructing a treatment plant in a location where the groundwater level (W, L) is relatively close to the ground surface (G). Groundwater enters into the excavated portion 10.

Once the excavated portion 10 is formed, a relatively flexible water-blocking sheet 12 made of synthetic resin or the like is laid over the four circumferential ground surfaces, slopes, and bottom surfaces.

Prior to laying, in this example, the water-blocking sheet 1
2 is divided into two sheets (12a, 12b) of approximately equal size as shown by the dotted line in FIG. Forked branch portions 14, 14 are formed integrally and over the entire length of the end portion.

Connection connectors 16, 16 having a zipper structure are fixed to the tips of the respective branch parts 14, 14. It is attached over the entire length of 14.

Installation of the water-shielding sheet 12 is carried out on each sheet 12a, 1
2b is rolled up, set at a predetermined position on the ground surface (G), and rolled back toward the center of the excavated portion 10, the sheets 12a, 12b
sinks into the groundwater due to its own weight, and branch part 1
4 and 14 face each other approximately at the center of the cutout 10, and the convex line 16a and the concave line groove 16 of the connecting connectors 16, 16
b are installed in close proximity.

After that, the protruding line 16a and the concave groove 16b of the connecting connector 16 are fitted together at one end, and the protruding line 16a is drawn into the concave groove 16b from the other end and pulled using an appropriate means. Since these have a zipper structure, the fitted state of the convex line 16a and the concave groove 16b is completed over the entire length.

Two connectors 1 with bifurcated branch parts 14, 14
When 6 and 16 are fitted together, the adjacent branch parts 14 and 14 are connected, and thereby the connection part 18
is defined.

When the connecting portion 18 is completed, the grout 20 is injected into the interior from one end side, and when the grout 20 reaches the other end side, the laying is completed.

The grout 20 used here is, for example, one prepared by kneading water and cement in an appropriate ratio and adding an admixture such as urethane resin.

The injected grout 20 hardens with the passage of time, ensuring water-tightness at the joint between the water-blocking sheets 12a and 12b, and also ensuring that the connectors 16,
It also penetrates into the fitting portion of No. 16, fixing the fitting portion and reinforcing its mechanical strength.

Note that the number of divisions of the water-blocking sheet 12a is not limited to that of the above embodiment, and may be divided as appropriate in consideration of the scale and workability of the treatment plant.

Furthermore, the means for forming the branch portions 14 of the water-blocking sheet 12 are not only integrally formed as described above;
It may also be formed by fixing a separately produced band-shaped water-blocking sheet.

Furthermore, the shape of the connector 16 for connection is not limited to the above-mentioned shape, but may have another structure as long as it is a zipper mechanism.

<<Effects of the Invention>> As described above in detail in the Examples, the method for laying a water-blocking sheet in a waste treatment plant according to the present invention is relatively easy to install even when groundwater has invaded, Since water-stop properties are ensured, effects such as the ability to reliably prevent the occurrence of secondary pollution can be obtained.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the method of the present invention, FIGS. 1 and 2 are explanatory diagrams showing the outline of the process, and FIG. 3 is an enlarged sectional view of the connecting portion. 10...Opening cut portion, 12...Waterproof sheet, 1
4...branch section, 16...connector, 18...coupling section, 20...grout.

Claims (1)

[Claims] 1. A method for laying a water-shielding sheet covering the entire surface of a waste disposal site that has been excavated into a concave shape, in which the water-shielding sheet is divided into a plurality of parts, a bifurcated branch is provided at each end, and the water-shielding sheet is Connectors for connection extending along the ends of the sections are respectively attached, and these water-blocking sheets are arranged in the cut-out section with the branch sections facing each other and the connectors being close to each other, and the connectors are connected to each other. 1. A method of laying a water-blocking sheet in a waste disposal plant, which comprises: fitting the two branches to each other to connect the branch parts, and then injecting grout into the connecting part defined by the adjacent branch parts.