JPH0641686B2 - Method of laying water-permeable sheet in landfill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of laying an impermeable sheet when landfilling the water surface to make an industrial waste treatment plant.

[Conventional technology]

In recent years, as a final waste disposal method, due to difficulty in suitable land in the inland area, water land reclamation, particularly sea surface reclamation, has been actively used in place of conventional inland land reclamation.

When landfilling the water as the final treatment of such waste, it is necessary to prevent harmful substances from the waste from leaching out of the waste treatment plant.

Therefore, in general, as shown in FIG. 2, an outer wall c such as a caisson is constructed on a rubble mound b provided on the water bottom a so as to surround the outside of the landfill portion, and a backfill stone d, Sabo sheet e and earth and sand f are sequentially laid to form an inverted trapezoidal slope p. An inverted trapezoidal floor moat g extending from the inverted trapezoidal portion is formed on the water bottom a. Next, a water-impermeable impermeable sheet h made of rubber, synthetic resin, etc.
The two slopes p are covered so as to cover the bottom moat g and the bottom i of the floor moat g is stretched, and then the impermeable sheet protective soil j is covered and the floor moat g is backfilled. Industrial waste is dumped into the industrial waste dumping space k formed in this way for landfilling, and when the landfilling by dumping waste is completed, the soil cover 1 is covered to complete landfilling. In addition, m is a value consolidation block, n is a concrete pavement part, and O is a U-shaped drain.

[Problems to be solved by the invention]

A conventional water-impermeable sheet h made of rubber, synthetic resin or the like usually has a specific gravity of 1 or more and sinks to the bottom of the water due to its own weight, but wrinkles easily occur when depositing on the slope p of the bottom due to the resistance of water. Therefore, this work is difficult because the diver has to pull the water-impervious sheet in water so as to prevent wrinkles and set the wrinkles so that they are exactly set on the slope p.

The present invention has been made in view of the problems of the prior art in water reclamation, and an impermeable sheet can be easily formed on the slope of the bottom of the water without such difficult wrinkle removal work by a diver. It is intended to provide a method that can be laid in.

[Means for solving problems]

In order to achieve the above object, a method of laying a water-blocking sheet in a landfill according to the present invention is such that a water-blocking sheet made of a water-impermeable material having a specific gravity of less than 1 is floated on the water surface while one end of the water-blocking sheet is fixed to a revetment and then a net It is characterized by depositing and fixing the impermeable sheet on the slope of the bottom of the water by sequentially covering the impermeable sheet with the weight net formed of the weight member from the bank protection side.

[Action]

According to the method of the present invention, one end is fixed to the seawall and the other side of the sheet is pulled by a rope or the like while the other side of the sheet is covered with a weight net sequentially from the seawall side to form the water impermeable sheet. Since it is deposited and fixed on the surface, the water impermeable sheet is less likely to wrinkle, and the impermeable sheet can be exactly deposited and fixed on the slope without the need for underwater wrinkle removal work by a diver.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The water-blocking sheet 1 (FIG. 1) is formed of a material having a specific gravity of less than 1 and one water-impermeable material. As such a material, a vulcanized rubber type EPDM or IIR, an ethylene vinyl acetate resin, a polyethylene resin or the like with a small amount of a filler compounded therein is preferable. In addition, polystyrene-based thermoplastic elastomers (SBS, S
IS, SEBS) can also be used. The waterproof sheet 1 is formed by joining a plurality of waterproof sheet members. An example of this water blocking sheet member is shown in FIG. In this example,
The water-blocking sheet member 2 is made of the above-mentioned material and is a raw material 2a, 2
b and 2c are joined together by heat fusion, and a protective soil slip-preventing sheet 3 made of a non-woven fabric is bonded thereon. Since the longitudinal edge portion 2d of the water-permeable sheet member 2 is joined by heat-sealing the edge portions of the adjacent water-impermeable sheets, the protective soil slip-preventing sheet 3 is left unattached. As the water-blocking sheet member 2, for example, one having a thickness t = 3 mm, a width W = 2200 mm, and a length L = 36 m is used, but this size can be appropriately determined according to the size of the waste treatment plant. it can.

The water-impervious sheet member 2 thus formed is wound around a core such as an iron pipe and transported to the construction site. A plurality of water-impervious sheet members 2 are bonded to each other at their longitudinal end edges 2d by sequential thermal fusion bonding on land or on a barge to form the water-impermeable sheet 1 having a predetermined length according to the dimension of the slope. To do. Joining is performed by an automatic heat fusion machine.

When the joining is performed on the pontoon, the joined impermeable sheet 1 is sequentially dropped from the pontoon to the water. The impermeable sheet 1 that has dropped onto the water has a specific gravity of less than 1 and thus floats on the water surface. The water-blocking sheet 1 is pulled by a rope tied to one end of the water-impervious sheet, and the end of the water-impervious sheet 1 is pulled up onto the revetment 4 and fixed to the revetment 4 by an anchor 5. As shown in FIG. 4, a reinforcing sheet 6 is preliminarily adhered and eyelets 7 are punched at the end of the water-blocking sheet 1 so as to be convenient when tying this rope or striking an anchor. The rope 8 is tied to the eyelet 7. As will be described later, the sheet pulling rope 8 can be used as a rope for fixing the sandbag in the water after pulling up the water blocking sheet 1 to the revetment 4 or dropping it from the revetment 4. The edges of the joined water-impervious sheet 1 should be pressed with sandbags on the pedestal so that they do not slide off the pedestal.

When joining is carried out on land, one end of the joined water-impervious sheet 1 is fixed to the seawall 4 by the anchor 5 and then the pulling rope 8 tied to the other end is pulled by a crane ship to bring the impermeable sheet 1 onto the water. Pull it down and float above the water.

As a method of joining the water-blocking sheet 1, an adhesive may be used in addition to the above heat-sealing, but the heat-sealing is shorter in curing time, and the water-blocking sheet 1 is joined on a ship or land. It is preferable because it takes less time to draw it down onto the water.

The impermeable sheet 1 is deposited and fixed on the slope so that it extends in both directions from the corners of the slope. As shown in FIG. 5, at the corners of the slope p, a rope 10 having a plurality of weights 9 such as sandbags attached at predetermined intervals is pulled by a crane ship and placed on the impermeable sheet 1 sequentially from the revetment 4 side. In this way, the water-permeable sheet 1 is deposited and fixed at the corners.

In order to fix the water-impervious sheet 1 on the slope p at portions other than the corners of the slope p, as shown in FIG. 1 (a), a weight net 11 made of a mesh-like weight member is used. The weight net 11 is hung by a crane ship, and as shown in FIG. 1 (b), the weight net 11 is placed on the water impermeable sheet 1 which is sequentially floating above the water from the revetment 4 side, so that the water impermeable sheet 1 is first Figure
As shown in (c), it is deposited and fixed on the slope p of the water bottom. At this time, in order to prevent wrinkling between the portion to be deposited and fixed and the portion floating on the water surface, it is preferable to pull the end of the water-blocking sheet 1 with a rope 16 or the like as shown in FIG.

In the embodiment shown in FIG. 1 and FIG. 6 which is a partially enlarged view thereof, the weight member formed in the mesh shape of the weight net 11 has a plurality of iron pipes 13 chained between the mounting rods 12 at both ends. 14 is connected in a net shape. The weight member formed in a net shape may be one in which round bars are connected by a chain instead of an iron pipe.
A combination of wire ropes, ropes, etc. may be used.

After the impermeable sheet 1 is deposited and fixed on the slope p by the weight net 11 as described above, as shown in FIG. 1 (c),
A rope 10 having a plurality of weights 9 such as sandbags attached at predetermined intervals is placed on the water-blocking sheet 1 so as to be pulled down from the anchor 5 at the top end, and the anchors 15 such as sandbags are attached by the work of the diver. The water impervious sheet 1 is pressed down by arranging it along the lower end of the water impervious sheet 1 at a predetermined interval. After that, the weight net 11 is pulled up, and the work for depositing and fixing the next floating portion of the water shield sheet 1 is performed. Alternatively, a plurality of weight nets may be prepared and used alternately.

In this way, a part of the water-blocking sheet 1 is loaded with a weight net 11
After fixing by the above, the operation is moved to the adjacent portion of the water-impervious sheet 1 and the above-mentioned work is repeated. In this way, the entire water-permeable sheet 1 is deposited and fixed on the slope p without any gap.

According to the present invention, the weight impermeable net 11 makes the water-permeable sheet 1
Since the water-impervious sheet 1 is set so that the water-proof sheet 1 is pressed against the slope p, there is no risk of the protective soil slip-preventing sheet 3 of the water-impermeable sheet 1 peeling off.

As the rope 10 for fixing the corners and other portions of the slope p, it is possible to use the rope 8 used for pulling the water-blocking sheet 1 to the revetment 4 or dropping it from the revetment 4.

〔The invention's effect〕

As described above, according to the present invention, one end is fixed to the revetment, and the impermeable sheet floating on the water surface is sequentially covered with the weight net from the revetment side to deposit and fix the impermeable sheet on the slope. Since it is difficult for wrinkles to wrinkle on the impermeable sheet, the impermeable sheet can be precisely deposited and fixed on the slope without the need for underwater wrinkle removal work by a diver, and it is extremely easy to lay the impermeable sheet on the slope. Can be done. Also, after depositing the water blocking sheet on the slope of the bottom of the water, other weights such as sandbags are placed on the water blocking sheet to fix the water blocking sheet, and then the weight net is pulled up. The weight net can be reused for the next work of depositing the water-impervious sheet, and the laying structure of the water-impermeable sheet can be simplified, whereby the labor and cost of the entire operation can be remarkably saved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a method of laying a water-blocking sheet according to the present invention, FIG. 2 is a sectional view showing a general structure of an industrial waste treatment plant by landfilling water, and FIG. FIG. 4 is a perspective view showing an example, FIG. 4 is a view showing an eyelet structure at an end portion of a water blocking sheet, FIG. 5 is a view showing a method of fixing the water blocking sheet at a corner of a waste treatment plant, and FIG. It is a figure which expands and shows a part of weight net. 1 ... water-blocking sheet, 4 ... revetment, 11 ... weight net.

Claims (2)

[Claims] 1. An impermeable sheet made of a non-permeable material having a specific gravity of less than 1 is floated on the water surface, and one end thereof is fixed to a revetment,
Next, a weight net composed of weight members formed in a net shape is sequentially covered from the revetment side onto the water blocking sheet, and the water blocking sheet is deposited on the slope of the bottom of the water, and then other weights such as sandbags are placed on the water blocking sheet. A method of laying a water-impervious sheet in a landfill, characterized in that the water-impervious sheet is fixed by allowing it to rise, and then the weight net is pulled up. 2. A water impermeable sheet is deposited on the corner of the slope by mounting a plurality of weights at predetermined intervals on the slope of the slope and placing the rope on the water impermeable sheet sequentially from the revetment side. The method of laying a water-blocking sheet according to claim 1, wherein the water-blocking sheet is fixed.