JPS6325121B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used to prevent the outflow of earth and sand thrown into the landfill side of embankments constructed in ports, coasts, rivers, lakes, and other areas, and to prevent industrial waste from flowing out. This invention relates to a method for laying slope covering sheets to prevent the outflow of harmful substances.

[Conventional technology] Conventionally, when an embankment was constructed for a landfill, it was used to prevent the soil thrown into the landfill from flowing out due to tides, water currents, waves, etc., and to prevent the industrial waste thrown into the landfill from being washed away In order to prevent harmful substances from flowing out from sludge and the like, a flexible and water-impermeable covering sheet is laid from the slope of the embankment body to the bottom of the water.

However, although the covering sheet generally needs to be laid over the entire surface of the reclaimed surface of the levee body, it is virtually impossible to manufacture a huge covering sheet that is to be laid over such a wide area and to transport it to the installation site. This is possible, and a method has been adopted in which sheet bodies of an appropriate size are laid down while their opposing side edges are joined at the installation location.

In consideration of the work of connecting the sheet bodies underwater, for example, as described in Japanese Utility Model Publication No. 57-6577, there is a method of fixing the opposing side edges of the sheet body by pressure contact with metal clips via packing. Alternatively, in order to avoid the work of connecting the sheet bodies underwater, a method has been adopted in which a barge is floated on the water surface on the finishing side and joining work such as welding is performed thereon.

[Problems to be solved by the invention] However, in general, working underwater is extremely difficult, requires skilled workers, increases costs, and requires parts such as gaskets and clips, making the work difficult. becomes complicated. Furthermore, the method of using a barge requires costs for equipment and management, and there are also problems in that the barge swings or moves due to wind, waves, etc., making the joining work difficult.

The present invention has been made in view of the above circumstances, and provides a method for easily, quickly and reliably laying a covering sheet from a slope to the bottom of the water without the need for underwater work or the use of a barge. It provides:

[Means for Solving the Problems] The method of laying a slope covering sheet according to the present invention involves fixing one end of a plurality of sheet bodies near the top of an embankment body and overlapping their opposing side edges. Alternatively, they can be installed along the upper part of the water surface of the slope in a butted state, and the free end side is reversed above the water surface and placed on the upper part of the water surface of the embankment body, and then the opposite side edge is attached to the embankment body. It is characterized by being watertightly joined at the top, and further by laying a plurality of joined sheet bodies from the slope to the bottom of the water.

[Example] Next, an example of the present invention will be described based on the drawings.

First, a material made of, for example, soft polyvinyl chloride resin, has a thickness of 1 to 6 mm, a width of 3 to 7 m, and a length of 6 to 6 mm.
Prepare a plurality of water-impermeable and flexible sheet bodies 1 with a length of about 20 m, and fix one end 2 of them to the surface near the top 4 of the embankment body 3, for example, on the reclaimed side of the top, with rivets 5. At the same time, the opposing side edges 6 and 7 of each sheet body 1 are overlapped with a width of 2 to 5 cm to form an overlapping portion 8. Next, these sheet bodies 1 are extended along a portion above the water surface 10 of the slope 9 on the landfill side, and the free end 11 side is placed above the water surface 10.
0 and placed on the upper part of the water surface 10 of the embankment body 3. Then, the overlapping portion 8 is glued with adhesive.
Alternatively, after watertightly joining them by an appropriate means such as heat welding, a plurality of mutually joined sheet bodies 1 are extended by an appropriate means and laid from the slope 9 to the bottom 12 of the water.

In addition, the sheet body 1 is reversed and the water surface 10 of the embankment body 3 is
The overlapping part 8 near the one end 2 that is covered by the part on the free end 11 side when placed on the upper part is either joined in advance immediately after fixing the sheet body 1 to the top end 4, or the free end 11 The side parts are laid down from the slope 9 to the water bottom 12 and then joined.

According to this embodiment, there is no need for connection work during underwater work, and the work can be carried out safely and easily on the embankment body without the need for special equipment such as a barge. A watertight joint can be made.

In the above embodiment, the opposing side edges 6 and 7 of each sheet body 1 are overlapped with an appropriate width to form an overlapped portion 8, and the overlapped portion is joined by adhesive or welding. As shown in Fig. 3, the opposite side edges 6 and 7 are brought close to each other in abutting manner without overlapping, and a width 2 to 3 is made of the same material as the sheet body 1 and has the same thickness.
A connecting body 13 having a diameter of about cm may be bonded watertightly by extending over the opposing side edges 6 and 7 and being fixed to one or both sides thereof by means of adhesive, welding, etc. over the entire length thereof.

[Effects of the Invention] According to the present invention having the above configuration, underwater work that requires special abilities and is extremely difficult, and special equipment such as a barge is not required, and work can be carried out on a stable embankment body. It is extremely easy to join the sheet bodies to each other, and at that time, one end of the sheet body is fixed in advance near the top of the embankment body, so it is possible to perform a reliable joint without shifting. It is something. Therefore, when the sheet body bonded in this way is laid from the slope to the bottom of the water, it is possible to ensure that the soil on the landfill side does not flow out, or that harmful substances from industrial waste, sludge, etc. that are thrown into the landfill side do not flow out. This is something that can be prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a sectional view, FIG. 2 is a partially cutaway plan view, and FIG. 3 is a joint portion of a sheet body in another embodiment. FIG. 1... Sheet body, 2... One end, 3... Embankment body, 4
...Top, 6,7...Opposite edge, 9...Slope, 1
0... Water surface, 11... Free end side, 12... Water bottom.

Claims (1)

[Claims] 1 A plurality of sheet bodies are installed along the upper part of the water surface of the slope with one end fixed to the vicinity of the top of the embankment body and their opposing side edges overlapped or abutted against each other, and the free end The sides are reversed above the water surface and placed on the upper part of the water surface of the embankment body, and then the opposing side edges are watertightly joined on the embankment body, and the multiple joined sheet bodies are further extended from the slope to the water bottom. A method for laying a slope covering sheet, which is characterized by laying a slope covering sheet.