JP2001212538A - Water barrier sheet laying structure and method for laying water barrier sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laying structure of a water barrier sheet which effectively and simply joins water barrier sheets laid at the bottom of a marine industrial waste disposal site and enables the joint part to stop water. SOLUTION: The present invention relates to a laying structure of a water barrier sheet laid in water at the bottom face of an industrial waste disposal site for landfilling a waste in water such as a coastal reclamation or the like. A plurality of the water barrier sheets are laid in water at the bottom face of the waste disposal site. In this instance, side fringe parts 11a and 11b of the water barrier sheets 11 are overlapped with each other in a vertical direction. The water barrier sheets 11 are jointed by means of a plurality of bolts penetrating the overlapped parts of the water barrier sheets 11 and fixed at the bottom face of the waste disposal site. An adhesive is thickly coated in water so to cover at least the periphery of the part of the overlapped parts of the water barrier sheets penetrated by the bolts and the side fringe part of the upper water barrier sheet 11 of the overlapped parts of the water barrier sheets 11 and its circumference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water permeable sheet laying structure and a water permeable sheet used for preventing leaching of retained water and rainwater in an industrial waste disposal site constructed in a water area for sea reclamation and the like. The present invention relates to a method of laying a sheet.

[0002]

2. Description of the Related Art Generally, when constructing a managed industrial waste disposal site on the sea (e.g., a seaside area), it is necessary to remove water and rainwater from the disposal site where industrial waste is dumped into the open sea. In order to prevent leaching, the inner surface (side and bottom) of the revetment at the industrial waste disposal site is covered with an impermeable material to ensure water shielding. For example, as a method of impermeable the inner surface of an industrial waste disposal site revetment, there is a method of covering the entire inner surface of the industrial waste disposal site revetment with a water-impervious sheet (for example, a resin having water impermeability such as ultra-soft vinyl chloride). Conventionally, when laying a waterproof sheet on the inner surface of an industrial waste disposal site revetment by this method, first install a number of floats on the waterproof sheet and float two adjacent waterproof sheets on the water surface. Lay in parallel. After that, a barge equipped with a welding machine is placed between the two water-impervious sheets, the ends of the two water-impervious sheets serving as welding surfaces are pulled up on the barge, and a wrap sheet is attached to the raised water-impervious sheet. Are stacked and welded by a welding machine to connect the two water-impervious sheets, and to secure the water stoppage at the connection between the water-impervious sheets. After that, while connecting the barge, the waterproof sheet is connected sequentially, and by repeating this work, a waterproof sheet corresponding to the shape of the laying surface inside the industrial waste disposal site is formed and floated on the water surface Keep it. Then, while grasping the exact position of the impermeable sheet, remove the float attached to the impermeable sheet from the revetment side, sink the impermeable sheet by the weight or load of the sheet itself, and sink the impermeable sheet at the seawall of the industrial waste disposal site. Lay it inside.

[0003]

However, in the above-mentioned method, many special barges (tugboats, barges, etc.) are required for welding work, and work cannot be performed in rainy weather.
It takes a lot of time and cost. In addition, it takes time to attach the float to the impermeable sheet, and time to remove the float when submerging the impermeable sheet in water. In addition, it is difficult to uniformly sink due to the influence of air bubbles and the like. In addition, when laying a seepage control sheet at the corner of a seawall, the shape of the welded part of the sheet becomes complicated, so the seepage control sheet is previously welded on the water surface so as to correspond to the shape of the corner of the seawall. It was difficult. An object of the present invention is to enable simpler and more effective joining of water-impervious sheets laid on the bottom surface of a marine industrial waste disposal site and water stoppage at the joining portion.

[0004]

In order to solve the above-mentioned problems, a water-impervious sheet laying structure according to claim 1 is provided underwater on a bottom surface of a waste disposal site for reclaiming waste in water such as sea surface reclamation. The laying structure of the impermeable sheet to be laid,
A plurality of water-impervious sheets are laid on the bottom surface of the waste disposal site, and side edges of the water-impervious sheets adjacent to each other are vertically overlapped with each other, and an overlapping portion of the water-impervious sheets adjacent to each other is provided. Is water stopped by a cured product cured in water.

According to the laying structure of the water-impervious sheet according to the first aspect of the present invention, the overlapping portion between the water-impervious sheets adjacent to each other in water is stopped by a cured product cured in water to thereby prevent the conventional water-impervious sheet at sea. Compared with the method of stopping water at the connection part of the water sheet, there is no need to perform the work of attaching and detaching the float or welding the impermeable sheet on the barge. Also, since the joining operation is performed underwater, it is not affected by the weather. Also, since the joint between the impermeable sheets can be stopped after the impermeable sheet is laid, it is easier to impermeable according to the shape of the waste treatment plant than when the impermeable sheets are joined on the water. Seat can be laid. Further, there is no generation of gas due to welding of the impermeable sheet. From the above, the construction work of laying the impermeable sheet becomes easy and the construction period and cost can be reduced. In the overlapping portion of the impermeable sheet,
It is necessary to join the water-impervious sheets, and if the water-impervious sheets are not joined together by the cured product, the water-impervious sheets will be joined by another method. Therefore, it is not necessary to join the water-impervious sheets by a joining method having a water-blocking property such as welding, and a well-known joining method that can be joined in water, for example, sandwiching the water-impervious sheets to be joined, And can be joined by fastening.

The laying structure of the impermeable sheet according to claim 2 is
In the laying structure of the impermeable sheet according to claim 1, the impermeable sheets are joined to each other by a plurality of fixing members penetrating an overlapping portion of the impermeable sheets and fixed to a bottom surface of a waste disposal site, The cured product is a peripheral portion of at least the penetrating portion of the fixing member among the overlapping portions of the water-impervious sheets, and a side edge of the water-impervious sheet and the periphery thereof, which are raised at the overlapping portion of the water-impervious sheet. It is characterized by being provided to cover.

[0007] According to the laying structure of the impermeable sheet according to the second aspect, the same effect as in the first aspect can be obtained, and the impermeable sheet is fixed to the bottom of the waste disposal site by penetrating the overlapping portion of the impermeable sheets. Since the water-impervious sheets are joined to each other by the plurality of fixing members, the water-impervious sheets can be joined in water with high joining strength. In other words, by not using welding that needs to be performed in the air, the water-impervious sheets can be joined together after laying the water-impervious sheets on the bottom of the water. Thus, the same effect as that of the above-described claim 1 can be obtained.

[0008] Further, at least the peripheral portion of the penetrating portion of the fixing member in the overlapping portion of the water impermeable sheets, and the side edge of the water impermeable sheet raised at the overlapping portion of the water impermeable sheet. And, it is provided so as to cover the surrounding area, so that the water stopping performance for preventing seepage water and rainwater in the disposal site from seeping into the open sea can be further increased by relatively easy work. In particular, even if a hole is made in the water-impervious sheet by the fixing member penetrating the water-impervious sheet, it is possible to ensure the water stoppage in the hole.

The laying structure of the impermeable sheet according to claim 3 is
In the laying structure of the water-impervious sheet according to claim 1, between the side edges of the water-impervious sheet in the overlapping part of the water-impervious sheets adjacent to each other, the inside is filled with a cured product having adhesiveness before curing. In addition, a pipe having a large number of holes through which the cured product can leak to the outside is arranged, and the cured product is leaked from the pipe by pressurizing an overlapping portion of the impermeable sheet sandwiching the pipe. By being cured, the adjacent water-impervious sheets are joined together, and the overlapping portions of these water-impervious sheets are stopped by the cured product.

According to the third aspect of the present invention, the same effect as in the first aspect can be obtained, and a pipe having a large number of holes through which the cured product can leak to the outside is arranged. Pressing the overlapping portion of the water-impervious sheet sandwiching the pipe, joining the adjacent water-impervious sheets by leaking and hardening the cured product from the pipe, so that the overlapping portion of the water-impervious sheet The existing seawater or the like is pushed out to the outside by the pressurized and leaked hardened material, so that the waterproof sheets are brought into close contact with each other, reducing the influence of water on the adhesiveness of the hardened material, and joining the joined portions. The strength can be increased, and the water stoppage for preventing seepage water and rainwater in the disposal site from seeping into the open sea can be increased.
In particular, when the cured product is used as an adhesive, the adhesive can be filled between the impermeable sheets to be joined while expelling water, so that the effect of water can be reduced to increase the bonding strength of the adhesive. it can.

The laying structure of the impermeable sheet according to claim 4 is
4. The laying structure of the impermeable sheet according to claim 3, wherein at least an overlapping portion of the impermeable sheet of the overlapping portion of the impermeable sheets adjacent to each other covers a side edge of the impermeable sheet and a periphery thereof. As described above, the present invention is characterized in that the sealing sheet is applied to the overlapping portion or the cured product is cured.

According to the laying structure of the impermeable sheet according to the fourth aspect, the same effect as in the third aspect is obtained, and the state where the sealing sheet is stuck on the overlapping portion or the cured product is cured. It has the effect of further increasing the water stoppage to prevent leaching of the retained water in the disposal site and rainwater into the open sea, and has a higher joint strength in the overlapping portion between the water-impervious sheets. Can be secured.

The laying structure of the impermeable sheet according to claim 5 is
The laid structure of a water-impervious sheet according to any one of claims 1 to 4, wherein the cured product is an adhesive.

According to the laying structure of the impermeable sheet according to the fifth aspect, the same effect as in the first to fourth aspects can be obtained, and by using the cured product as an adhesive, another cured product such as concrete can be obtained. As compared with the above, it is possible to shorten the construction period due to the quick curing property, and it is possible to obtain a high water stopping property by the cured adhesive. Further, since the cured adhesive has the same elasticity as that of the resin or the like, even if displacement occurs in the water-stopped portion, it can be hardly broken or peeled. In particular, by using an elastic adhesive which becomes a rubber-like elastic body in a cured state, the above-mentioned effect can be further enhanced. In addition, an adhesive cured in water has a lower adhesive strength than that of an adhesive cured in the air, but can exhibit a sufficient water stopping property. In addition, according to the configuration as described in claim 3 or 4, the adhesive is leaked between the overlapping water-impermeable sheets while driving out water such as seawater from the overlapping portion of the water-impermeable sheets as described above, By bonding the water-impervious sheets to each other, the adhesive strength of the adhesive can be increased to some extent even in water, and an adhesive that cures in water can be used for joining the water-impervious sheets.

According to a sixth aspect of the present invention, there is provided a method for laying a waterproof sheet.
A method for laying a waterproof sheet using the waterproof sheet laying structure according to any one of claims 1 to 5, wherein the waterproof sheet is laid on the underwater bottom surface of the industrial waste disposal site. Along with, the side edges of the impermeable sheets laid adjacent to each other are vertically overlapped, and by curing the cured product in water at the overlapping portion of the impermeable sheet, the overlapping portion is stopped. It is characterized in that it is in a state of being in a closed state.

According to the method of laying a seepage control sheet according to the sixth aspect, the same effects as those of the first to fifth aspects can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for connecting a water-impervious sheet underwater according to the present invention will be described below in detail with reference to the drawings.

[First Embodiment] In the first embodiment, the present invention is applied to laying of a water-impervious sheet in a landfill area of a waste disposal site formed for sea surface landfill shown in FIG. are doing. Here, the landfill area shown in FIG. 1 is formed in a square shape, and portions corresponding to the four sides of the square surrounding the bottom 1 are a revetment 2, a revetment 3, a quay 4, and a middle partition 5, respectively. The bottom 1 has an upper surface formed of concrete made of underwater concrete or precast concrete as described later.

The periphery of the bottom 1 is a slope 6 which is an inner slope of the revetments 2 and 3, the quay 4, and the partition 5. A well-known impermeable sheet is laid on the bottom 1 and the slope 6. Next, the laying structure of the impermeable sheet will be described using the area A of the landfill area shown in FIG. 1 as an example.

As shown in FIGS. 2 (a) and 2 (b), in the laying structure of the waterproof sheet in this example, a plurality of long rectangular shields are provided on the upper surface of the concrete bottom 1 in the landfill area. The water sheet 11 is laid so that the longitudinal directions thereof are substantially parallel to each other so as to cover all the upper surfaces of the bottom 1 and the slope 6, and the side edges 11 a,
11b are arranged vertically overlapping.

On the overlapping portion between the adjacent water-impervious sheets 11, a long thin plate-like plate 12 is provided.
It is arranged along the longitudinal direction of the overlapping portion. And
The plate 12 is provided with a hole (not shown) through which the bolt 13 is inserted. A bolt 13 is fastened to the bottom 1 so as to penetrate the hole of the plate 12 and the overlapping portion of the two impermeable sheets 11 overlapping each other.

A screw hole is formed in the bottom portion 1 by, for example, previously embedding a member (not shown) having a screw hole in concrete.
3 is screwed together, so that the bolt 13 fastens the plate 12 and the two impermeable sheets 11 to the bottom 1. The plate 12 and the bolt 13 are
For example, it is made of steel or stainless steel, but it is preferable that it has rustproofing property or has been subjected to rustproofing treatment. With such a configuration, the two water-impervious sheets 11 are joined to each other at an overlapping portion, and are fixed to the bottom 1.

In the laying structure of the impermeable sheet of this example, the side edges 1 vertically overlapping the two impermeable sheets.
An adhesive (cured material) 15 is applied in a thick band shape to the side edge of the upper side edge portion 11a of 1a and 11b and the periphery thereof. That is, from the side edge 11a of the upper water-impervious sheet 11 to the lower water-impervious sheet 11 (side edge 11b)
The adhesive 15 is applied so as to straddle.

An adhesive (cured material) 16 is applied to the left and right side edges of the plate 12 and the periphery thereof in a thick band shape. That is, the adhesive 16 is applied so as to extend from the side edge of the plate 12 to the lower impermeable sheet 11. An adhesive (cured material) 17 is applied to the periphery of the head of the bolt 13 and its vicinity in a belt-like and thick ring shape. That is, the adhesive 17 is applied to the plate 12 around the bolt 13 from the periphery of the head of the bolt 13.

The adhesives 15, 16, 17 are:
Water is stopped between the two members in a portion applied over the two members. Therefore, the adhesive 15 applied to the vicinity of the side edge of the upper side edge 11a of the water impermeable sheet 11 causes the water to flow to the overlapping portion of the side edges 11a and 11b of the two adjacent water impermeable sheets 11. This is to prevent infiltration and stop the water at the joint between the water impermeable sheets 11. The adhesives 16 and 17 applied to the plate 12 and the bolt 13 prevent water from entering the lower side of the plate 12 and the lower side of the head of the bolt 13 so that the bolt 13 penetrates. By preventing water from entering the holes of the impermeable sheet 11, the junction between the impermeable sheets 11 is stopped.

The application of the adhesives 15, 16 and 17 is performed by applying the side edges 11a and 11a of the adjacent impermeable sheets 11 to each other.
The water-impervious sheet 11 is laid on the bottom portion 1 so that the b overlaps each other, and the overlapping portion of the water-impervious sheets 11 is joined by the plate 12 and the bolts 13. , 16, 17 cure in water. When the adhesives 15, 16, 17 are applied and cured in water, the adhesive strength of the adhesives 15, 16, 17 is reduced due to the effect of water (seawater). However, in this example, the adhesives 15, 1
The adhesives 6 and 17 do not need to contribute to the joining of the impermeable sheet 11 already joined by the bolts 13 or the like.
The layers 5, 16, and 17 may be any as long as they can exhibit an adhesive strength in water to such an extent that they cannot be peeled off from the applied portions of the water-blocking sheet 11, the plate 12, the bolts 13 and the like.

Accordingly, the adhesives 15, 16 and 17 may be any adhesives having an extremely low water permeability and having an adhesive strength such that the adhesives 15, 16 and 17 are not peeled off from the object to be applied even when applied in water. The adhesives 15, 16, and 17 are preferably elastic adhesives that have elasticity and can be elastically deformed even after being hardened (they become rubber-like elastic bodies after hardening). Then, even if an external force or the like is applied to the water-blocking sheet 11 or the like and the applied portion of the adhesive is slightly displaced, the cured adhesive can be reliably secured without breaking or peeling off.

As the adhesive, for example, an elastic adhesive can be suitably used as described above. For example, an elastic adhesive whose base is a modified silicone / epoxy matrix can be used. And specifically, PM165 (manufactured by Cemedine Co., Ltd.), which is a one-pack type mastic adhesive containing almost no nonvolatile components and requiring no primer, can be suitably used. In addition, if it is an elastic adhesive, the base is not limited to the above-mentioned adhesive, and the base is a special silicone-modified polymer type,
Others can be used.

Further, as the adhesives 15, 16, 17 in this example, an adhesive adhesive having elasticity even when cured as in the case of the elastic adhesive can be used. And specifically, as a pressure-sensitive adhesive, Super XNo. 8008 (manufactured by Cemedine Corporation) can be used. Note that SG-1 manufactured by Cemedine Co., Ltd. can also be suitably used as the adhesive in this example. Further, the adhesive 15 of this example as described above,
Preferred properties of the adhesives suitably used as 16, 17 include elasticity after curing in order to maintain the water stopping property for a long time, and room-temperature quick-curing, solvent-free, one-pack type for workability. , A non-primer, a point of absorbing moisture and curing, but it is not necessary to satisfy all of them.

Next, a sheet laying method using the above-described sheet laying structure will be described. First, in a landfill area as shown in FIG. 1, a bottom 1 is constructed using underwater concrete or precast concrete described later. At this time, the bolt 1 is attached to the bottom 1.
A screw hole for screwing 3 is formed. Then, for example, a long rectangular water-impervious sheet 11 is laid on the bottom 1 and the slope 6 in water using a sheet laying machine described later. In this case, the longitudinal direction of each impermeable sheet 11 is made parallel to each other, and the side edges 11a and 11b of the adjacent impermeable sheet 11 are vertically overlapped.

In the water, a plate 12 made of a rectangular thin plate is arranged at an overlapping portion of two adjacent water-impervious sheets 11. Then, through the plate 12, 2
Bolts 13 extending from the upper side of the overlapping portion of the water impermeable sheets 11 to the inside of the bottom 1 are screwed into the screw holes. This operation is repeated over the entire area of the water-impervious sheet 11 in the longitudinal direction, so that two adjacent water-impervious sheets 11 are connected to each other and fixed to the bottom 1.

Then, the side edges of the upper water-impervious sheet 11 of the two overlapping water-impervious sheets 11 and the periphery thereof, the peripheral portion of the penetrating portion of the bolt 13 and the side edge of the plate 12 and the periphery thereof become thicker. The adhesives 15, 16, 17 are applied in water. In this way, the above-mentioned parts are bonded to the adhesives 15, 16,
By covering with 17, it is possible to maintain the water-stopping property for preventing the water retained in the waste disposal site and rainwater from seeping into the open sea or the like at the joint between the water-shielding sheets 11. Further, the adhesives 15, 16 and 17 in water may not necessarily exhibit sufficient bonding strength,
By combining with the above-mentioned joining of the water-impervious sheets 11, it is possible to secure sufficient joining strength and water-blocking at the joint of the water-impervious sheets 11.

Further, according to the structure and method of laying the impermeable sheet of this embodiment, the impermeable sheet 11 is directly
And, it is laid on the slope portion 6, and then the adjacent water-impervious sheets 11 are joined together in water, and the waterproofness of these joints is secured by applying an adhesive in water.
Therefore, in order to join the water-impervious sheets 11 to each other and to secure the water stoppage at the joints as in the related art, a large number of water-impervious sheets 11 are welded, as in the case where the water-impervious sheets 11 are welded on water. , The water-impervious sheet 11 is spread on the water surface, and then the side edges 11a and 11b of the water-impervious sheet 11 to be joined to each other are pulled up onto the barge and the side edges 11a and 11b are raised.
a, 11b are welded together, then the float is removed,
There is no need to perform an operation to sink the joined impermeable sheet 11.

That is, by eliminating the work of attaching and detaching a large number of floats, the work of laying the impermeable sheet can be greatly saved, and the construction period can be shortened and the cost can be reduced. Also, when laying the impermeable sheet 11 on a portion having a three-dimensional shape in which the upper surface of the bottom portion 1 and two slope portions 6 having different directions are combined, such as a corner portion of a landfill area of a waste disposal site. In addition, after laying the impermeable sheets 11 before being joined to each other, the laid impermeable sheets 11 can be joined to each other, so that even a portion having a three-dimensional shape can be more easily and reliably compared to the related art. The impermeable sheet 11 can be laid.

In the case where the water impermeable sheets 11 are welded to each other on the water as in the prior art, even a little rain may affect the work. In this example, the water impermeable sheets 11 can be joined together in water. The work can be performed without being greatly affected by the weather, and the work can be prevented from being delayed due to the weather. Also. Since the water-impervious sheets are not joined to each other by welding as in the related art, generation of gas at the time of welding can be eliminated.

The present invention is not limited to the water-impervious sheet laying structure shown in FIG. 2. For example, instead of the bolt 13, a drive pin (dry bit) is provided on the overlapping part of the water-impervious sheet 11. Alternatively, the impervious sheets 11 may be joined to each other at overlapping portions by being driven into the bottom 1 made of concrete and fixed to the bottom 1. As shown in FIG. 3, instead of using the plate 12, a washer 18 is used, and the side edge of the upper water-impervious sheet 11 of the two overlapping water-impervious sheets 11 and the periphery thereof are the above-described example. As described above, the same effect as in the above example can be obtained by covering the area around the bolt 13 and the area around the washer 18 with the adhesive 19 while covering with the adhesive 15. The laying structure of the impermeable sheet shown in FIG. 3 uses a washer 18 instead of the above-mentioned plate 12 and the laying structure of the impermeable sheet shown in FIG.
Are similar except that the coating shape is slightly different, and the same components are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 4, similarly to the case of the above example, two adjacent impermeable sheets 11 are connected by the bolts 13 via the plate 12 and fixed to the inner surface of the waste disposal site. After that, by retaining the underwater concrete 20 so as to cover the entire joint of the bolt 13, the plate 12, and the two overlapping water-impervious sheets 11, the water-impermeability of the waste disposal shore inner surface is also maintained, In addition, it is possible to secure a sufficient bonding strength at a bonding portion between the two water-impervious sheets 11. That is, the adhesive 15, 1
Instead of 6, 17, and 19, joining of the impermeable sheet 11 is achieved by covering the entire overlapping portion (a little wider area than the overlapping portion) of the adjacent impermeable sheet 11 with underwater concrete (hardened material) having excellent impermeable performance. You may ensure the waterproofness of a part.

In FIG. 4, the bottom 1 is made of precast concrete, which will be described later. Also,
In the overlapping portion between the water-impervious sheets 11, the water-impervious sheet 1 is not fixed in one row as in the above example, but in two rows.
1 are fixed to the bottom 1 in a state where they are joined to each other. In FIG. 4, the adhesives 15, 16, and
17 is applied, and then underwater concrete 20
May be cast.

Next, the structure of the bottom 1 when the bottom 1 of the landfill area is constructed of precast concrete will be described by taking the area A of the landfill area as an example. 4 and 5
As shown in the figure, the bottom 1 is placed on the bottom of the landfill
1 are spread and leveled, and a plurality of rectangular plate-like blocks 22 made of precast concrete are placed thereon.
23 are formed. The base material 21 may be a small-diameter material such as sand, crushed stone, or granulated slag. In addition, the blocks 22 and 23 shown in FIGS. 6A and 6B and FIGS. 7A and 7B have a block 23 having a structure for bonding the impermeable sheet 11 thereon. Some blocks 22 do not have such a structure.

The blocks 22, 23 are provided with suspension bars 24 near the four corners as suspension hooks when the blocks 22, 23 are disposed on the bottom of the landfill area via a crane or the like. . Blocks 22 and 23
The joint streaks 25 and the water blocking plate 26 are provided on the four side edges, which are the outer circumferences, so as to protrude outward from the end surfaces of the respective side edges. The joint muscle 25 is a block 2
At the end faces of the side edges of the blocks 2, 2, 23,
3 are provided at equal intervals in upper and lower two rows along the side edge of the block 3, and are used when the blocks 22 and 23 are joined to each other.

Further, the water stop plate 26 is provided with a block 22,
On the end surface around the block 23, the block 22, 23 is provided so as to protrude horizontally so as to surround the entire periphery of the block 22, 23 between the joint streaks 25 arranged in the upper and lower rows.
The waterproofness of the joint between the three is enhanced. Further, as shown in FIG. 6, the block 23 having a structure for joining the water-impermeable sheets 11 is used when joining the water-impermeable sheets 11 as shown in FIG. Screw holes 28 for screwing the bolts 13 are formed in two rows.
The plate 12 and the bolts 13 having openings at positions corresponding to 8 are arranged in parallel in two rows. Note that the plate 12 and the bolts 13 are attached from above after laying the impermeable sheet 11.
In the block 23, the screw holes 28 may be arranged in a line so as to correspond to the joining method of the impermeable sheet 11 shown in FIGS. 2 and 3 described above.

Then, such blocks 22, 23
However, as shown in FIG. 5, they are arranged in parallel on the bottom 1. That is, the rectangular blocks 22 and 23 are arranged in a plurality of rows in parallel with each other along the short side direction, and the arrangement positions of the blocks 22 and 23 in the adjacent rows are approximately equal to those of the blocks 22 and 23. It is arranged so as to be shifted by half the length of the short side. In addition, each adjacent block 22,
23 are arranged at intervals so that the joint streaks 25 and the water blocking plate 26 projecting from the blocks 22 and 23 do not come into contact with each other.

A space between the blocks 22 and 23 is filled with a resin hardening material 29 such as an adhesive or a sealing material.
The joints 25 join the blocks 22 and 23 together, and increase the water stopping performance between the blocks 22 and 23. Even if the bottom 1 is displaced due to uneven settlement or the like, the displacement is hardened by using a hardening material 29 such as an elastic adhesive or a sealing material having relatively high elasticity when the hardening material 29 is hardened. It is absorbed by the material 29 and protects the blocks 22, 23 and the joint between the blocks 22, 23. When the ground of the waste disposal site construction site has a certain strength such as rock, for example, a hardening material having no elasticity when hardening such as underwater concrete may be used as the hardening material 29. Underwater concrete may be cast on the bottom 1 instead of the blocks 22 and 23.

Next, area B of the landfill area of the waste disposal site
The laying structure of the impermeable sheet on the slope 6 will be described.
In the normal slope portion 6, the water shielding of the slope portion is ensured by laying two water-impervious sheets 11 in layers without using underwater concrete or precast concrete as in the bottom portion 1 and further protecting with a nonwoven fabric 34. are doing.
Therefore, in joining the water impermeable sheets 11, as shown in FIG.
1, 33 are joined to the upper and lower two impermeable sheets 31, 33, respectively. The joint between the upper and lower two impermeable sheets 31 and 33 shown in FIG. 8 is, for example, the slope 6 of the adjacent impermeable sheets 31 and 33 in the slope 6 of the area B of the landfill area shown in FIG. The side edges along the inclination direction are joined to each other. In addition, the impermeable sheet 31,
The lower water-impervious sheet 31 of 33 is continuously laid on the bottom 1 from the slope 6 and is provided with the above-described water-impervious sheet 11.
Is

As shown in FIG. 8, in the laying structure of the water-impervious sheet, a first water-impervious sheet 31 laid to cover the surface of the slope 6, and an upper surface of the first water-impervious sheet 31 , A second waterproof sheet 33 laid on the upper surface of the protective material 32, a nonwoven fabric 34 laid to cover the surface of the second waterproof sheet 33, The plurality of bolts 13 used to join the respective overlapping portions of the water-impervious sheets 31 and the adjacent second water-impervious sheets 33, the water-impervious sheets 31, 33 and the bolts 13
A plurality of plates 12 interposed between the heads, a joint plate 36 having a screw hole to be screwed with the bolt 13 for joining the overlapping first water-impervious sheet 31, and the water-impervious sheets 31, 33. Underwater concrete 3 cast to cover the joint, the bolt 13 and the plate 12
7, 38, and an inclined portion 39 arranged to fill a step caused by a height difference between the underwater concrete 37 and the protection member 32. The protective material 32
Is a cushion material such as a nonwoven fabric or sand, and is used to absorb the impact when burying waste.
The inclined portion 39 is provided so that the second impermeable sheet 33 laid on the upper surface of the underwater concrete 37 is
It is provided to prevent the cable from being laid in a state where it is bent almost at a right angle. The inclined portion 39 is provided integrally with the underwater concrete 37, for example, and the side edge of the inclined portion 39 on the underwater concrete 37 side is formed of the underwater concrete 3.
7 and the protection material 32 on the opposite side.
The side edge of the side is approximately the same thickness as the protective material 32, and the upper side is formed as an inclined surface. The inclined portion 39 may be provided after the underwater concrete 37 has been cast, or a member other than the underwater concrete may be used. In addition, in order to increase the water barrier property of the joint between the adjacent water barrier sheets 31, 33, the side edges of the first water barrier sheet 31, the second water barrier sheet 33, and the plate 13, and the peripheral edge thereof. An adhesive (not shown) is applied to the periphery of the penetrating portion of the bolt 13 in the same manner as in the case of joining the impermeable sheet 11 shown in FIG.

Next, the laying structure of the impermeable sheet will be described more specifically while explaining the method of laying the impermeable sheet on the slope 6. A plurality of long rectangular first water-impervious sheets 31 are respectively laid from the top to the bottom of the slope 6. At this time, the left and right side edges of the plurality of first water-impervious sheets 31 laid along the slope direction of the slope 6 are the same as the side edges of the adjacent first water-impervious sheet 31. Lay them so that they overlap.

Also, two adjacent first water-impervious sheets 31
The joint plate 36 is arranged between the overlapping portion of the above and the slope portion 6. Then, the bolts 13 are screwed into the joint plate 36 through the overlapping portion of the first water-impervious sheet 31 and the plate 12 thereabove, so that the two first water-impervious sheets 31 overlap each other. Join. Then, the adhesive is applied to the side edges and the peripheral edge of the first water-impervious sheet 31 and the plate 13 and the peripheral portion of the penetrating portion of the bolt 13 in order to increase the water impermeability of the joint, The underwater concrete 37 is cast so as to cover the entire joint. This operation is repeated over the entire area of the connection between the first water impermeable sheets 31 to connect the two adjacent water impermeable sheets 31 to each other.

On the other hand, in the slope 6, a protective material 32 is disposed on a portion of the first impermeable sheet 31 except for a portion where the underwater concrete 37 is cast. In addition, a level difference caused by a height difference between the underwater concrete 37 cast at the joint portion between the first water impermeable sheets 31 and the protection material 32 disposed on the first water impermeable sheet 31 is filled. An inclined portion 39 arranged to make a slope is disposed adjacent to the left and right of the underwater concrete 37.

Next, the protective material 32, the inclined portion 39, and the underwater concrete 37 are placed on the first water-impervious sheet 31 of the slope 6.
Through the second impermeable sheet 33 to the first impermeable sheet 31
Lay it in the same way. At this time, the side edges of the adjacent second water-impervious sheets 33 are connected to the adjacent first water-impervious sheets 3.
It is arranged so as to be overlapped on the overlapping portion of one.

The respective side edges, which are the joining portions of the two second water-impervious sheets 33, are overlapped on the upper surface of the underwater concrete 37, and the upper surface of the overlapping portion is connected to the bolt 13 via the plate 12. Underwater concrete 37
The two second water-impervious sheets 33 that are overlapped with each other are screwed into the screw holes formed in. Thereafter, the adhesive (not shown) is applied to the second water-impervious sheet 33, the side edge and the peripheral edge of the plate 12, and the peripheral edge of the penetrating portion of the bolt 13 in order to increase the water impermeability of the joint. The underwater concrete 3 is further covered so as to cover the entire joint.
8 is cast. By repeating this work over the entire connecting portion between the second water-impervious sheets 33, two adjacent water-impervious sheets 33 can be connected to each other in a state of imparting waterproofness, and landfilled. Water stoppage can be maintained to prevent leaching of retained water and rainwater in the area into the open sea.

When the underwater concretes 37 and 38 have sufficient water barrier properties, the adhesive does not need to be applied. As shown in FIG. 9, the lower slope of the joint portion between the two overlapping first water-impervious sheets 31 is excavated along the length direction of the joint portion, and the bottom surface of the excavated portion is formed. The two H-shaped steels 40 are arranged in parallel to the left and right such that the lower flange surface thereof abuts against the bottom surface of the excavation site. Then, a large number of joint plates 36 are arranged so as to be bridged between the upper flange surfaces of the two H-shaped steels 40, and the joint plate 36 is joined to the H-shaped steel 40, and the excavated portion is formed into a slope and a surface. Backfill to be one. Then, the first water-impervious sheet 31 and the second water-impervious sheet 33 may be joined by the above-described joining method. By doing so, the joint plate 36 is securely fixed to the slope 6 by the H-shaped steel 40, so that the joint between the first water-impervious sheets 31 is firmly fastened to the slope 6 by the bolt 13. State. In FIG. 10,
The state in which the H-section steel 40 is embedded in the slope 6 is illustrated.

Next, the fixing of the end of the second waterproof sheet 33 on the bottom 1 side to the bottom 1 will be described. As described above, the first water-impervious sheet 31 is continuously laid from the slope 6 to the bottom 1, while the second water-impervious sheet 33 is laid from the slope 6 to the slope 6 of the bottom 1. And is fixed to the bottom 1 at a portion of the bottom 1 near the slope 6. Here, FIG. 11 shows a case where the bottom 1 is made of a base material 21 and precast concrete, and FIG. 12 shows a case where the bottom 1 is made of underwater concrete. As shown in FIGS. 11 and 12, the end of the second impermeable sheet 33 is in a state along the boundary between the slope 6 and the bottom 1. The end of the second water-impervious sheet 33 is slightly beyond the boundary to the bottom 1 side.

As shown in FIGS. 11 and 12, the end of the second impermeable sheet 33 is fixed to the bottom 1 near the boundary with the slope 6 on the bottom 1. The above-mentioned joint plate 36 is arranged along with the above, and the end of the second impermeable sheet 33 is laid on the joint plate 36.

Then, the above-mentioned plate 12 is arranged on the end of the second impermeable sheet 33. At this time, the screw hole of the joint plate 36 and the insertion hole of the plate 12 are vertically overlapped. Then, bolt 13 is attached to plate 1
2, the second water-impervious sheet 33 is passed through the insertion hole of the plate 12 and screwed into the screw hole of the joint plate 36. The underwater concrete 4 surrounds the side edge of the bottom 1 side end of the second impermeable sheet 33.
1 is cast. Thereby, the end of the second water impermeable sheet 33 can be fixed to the bottom 1.

The tip of the bolt 13 exceeds the joint plate 36 and the first water-impervious sheet 3
1 to the bottom 1. Further, it is preferable that the above-mentioned adhesive is applied to the side edge on the end side of the second water-impervious sheet 33 and the periphery thereof and the peripheral edge of the bolt 13, and then the underwater concrete 41 is cast. Also,
Although the first water-impervious sheet 31 is laid continuously on the bottom 1 side to become the above-described water-impervious sheet 11 for the bottom 1,
The first impermeable sheet 31 and the impermeable sheet 11 are separate bodies,
The first and second waterproof sheets 31, 33 and the waterproof sheet 11 may be joined to each other at the fixed portion of the second waterproof sheet 33 as described above. In this case,
Since the fixed portion of the second water-impervious sheet 33 has basically the same configuration as the joint between the water-impervious sheets 11 shown in FIG. 4, it is possible to ensure the waterproofness of the joint of the water-impervious sheets.

[Second Embodiment] Next, a laying structure and a laying method of a seepage control sheet according to a second embodiment of the present invention will be described. As shown in FIGS. 13, 14 (a), (b), (c) and FIG. 15, in the laying structure of the impermeable sheet of the second example,
In the landfill area of the waste disposal site as described in the first example, the impermeable sheet 51 is provided in the same manner as in the first example. That is, a plurality of long rectangular water-impervious sheets 51 are laid so as to cover the bottom surface of the landfill area, and the side edges 51a and 51b of the adjacent water-impervious sheets 51 are vertically overlapped. ing. Two pipes 52 filled with an adhesive (similar to the case of the first example) are provided between the upper and lower water-impervious sheets 51 in parallel with each other. It is sandwiched along the side edge. The pipe 52 is made of a material having holes or voids through which the adhesive can leak from the inside, such as a woven cloth, for example.
The adhesive is pumped into the pipe 52, the adhesive is filled,
When pressed with the adhesive filled, the pipe 5
2 has a structure in which the above-mentioned holes and voids are expanded when expanded. Further, the tube 52 is crushed into a flat plate by pressing. The pipe 52 is not limited to a woven cloth, but may be made of a sheet or a non-woven cloth made of various resins, and may have a large number of holes and voids through which the adhesive leaks from the inside of the pipe 52 to the outside. Good. When the tube 52 expands, it is preferable that the hole and the void are widened as described above.

Further, as shown in FIG.
Is that one of them is fixed to the lower surface of the upper side edge 51a of the side edges 51a and 51b of the adjacent impermeable sheet 51, and the other of the two pipes 52 is Is fixed to the upper surface of the side edge portion 51b. The impermeable sheet 5
The method of fixing the tube 52 to the tube 1 is not particularly limited, and can be fixed by bonding or sewing. Then, in this example, the seawater in the overlapping portion is pushed out by pressing the overlapping portion of the side edges 51a, 51b of the water-blocking sheet 51 which vertically overlaps, and the adhesive filled in the pipe 52 is removed. The adhesive is applied between the side edges 51a and 51b of the water-impervious sheet 51 by leaking from the pipe 52. And in this state,
Side edges 51a, 51b of the water impermeable sheet 51 overlapping each other
Adhesives are bonded to each other to join adjacent water-impervious sheets 51, and the joint between the water-impervious sheets 51 is stopped by the adhesive. For example, when the slope is made of rubble or the like and is not formed flat, or when it is difficult to take a reaction force at the time of compaction such as sand, a plate-like member is formed of the two water-impervious sheets 51. It is preferable to lay under the overlapping part.

Next, a method for laying a water-impermeable sheet having the structure for laying a water-impermeable sheet of the second example will be described. As shown in FIG. 16, the impermeable sheet 51 is laid from the slope of the revetment 53 partitioning the landfill area of the waste disposal site from the open sea toward the bottom of the landfill area. In addition, laying of the impermeable sheet 51,
This is performed by a sheet laying machine including a barge 54, a crane 55 on the barge 54, and a sheet roll 56 that is lifted by the crane 55 and wound with the impermeable sheet 51. Further, the sheet laying machine is provided with a GPS having an error correction mechanism so as to accurately measure the position of the sheet laying machine, and is provided with a sonar for detecting the position of the sheet roll 56 lowered in water. . The seat roll 56 is provided with a video camera, lighting, and the like for photographing an underwater laying state. This sheet laying machine is an application of the present invention to laying a sandproof sheet on a waste stone mound. By using the sheet laying machine, the above GPS laying machine is used.
With the use of a sonar, a video camera, or the like, the impermeable sheet 51 can be laid easily and accurately in a short period of time.

Then, the sheet laying machine uses the sheet roll 5
6 is suspended and supported by a crane 55 on the barge 54 via a hanger, and based on the position of the barge 54 measured by GPS and the position of the sheet roll 56 with respect to the barge 54 measured by sonar. While checking the position of the sheet roll 56, the sheet roll 56 is moved along the slope and the bottom of the landfill area, and the water-impervious sheet 51 is fed out from the sheet roll 56, and the water-impervious sheet 51 is moved from the slope to the bottom. Lay it towards the top. In this case, the side edges 51a and 51b of the adjacent impermeable sheets 51 are overlapped. In addition, on the side edges 51a and 51b of the water impermeable sheet 51,
With the pipe 52 already attached, the impermeable sheet 5
Lay 1

In the state where the impermeable sheet 51 is laid, as shown in FIGS. 14 (a) and 15, two parallel side edges 51a and 51b of the impermeable sheet 51 are arranged in parallel. Are arranged in a state of being sandwiched. next,
The adhesive is applied to a pipe 52 by a pumping device 60 schematically shown in FIG.
14 and filling the tube 52 with an adhesive,
As shown in (b), the tube is swollen by the filled adhesive.

As shown schematically in FIG. 17, the pumping device 60 comprises a pumping tube 61 connected to a tube 52,
A cylinder 62 having a discharge port 62a connected to the pressure feeding pipe 61.
And an adhesive container 63 disposed in the cylinder 62, and a plunger device 64 for extruding the adhesive from the adhesive container 63 in the cylinder 62 to the discharge port 62a of the cylinder 62. The adhesive container 63 has a discharge port 63a and has flexibility in a state in which a portion other than the discharge port 63a is sealed, and discharges the adhesive from the discharge port 63a when pressed. It is what came to be.

The discharge port 63a of the adhesive container 63
Is fitted and fixed to the discharge port 62a of the cylinder 62 from the inside thereof.
When the adhesive container 63 is accommodated in a state where the adhesive container 3a is fitted and fixed to the discharge port 62a, and the plunger device 64 is operated so as to press the adhesive container 63, the adhesive comes into contact with the cylinder 62. And the discharge port 62a of the cylinder 62
, The adhesive is discharged to the pressure feed pipe 61.
Therefore, the cylinder 62 and the plunger device 64 of the pumping device 60 do not come into contact with the adhesive, and the adhesive that has adhered to the cylinder 62 and the plunger device 64 does not harden and becomes difficult to use. The maintenance of the pumping device 60 is extremely easy.

In the tube 52 filled with the adhesive and swelled by such a pressure-feeding device 60, the holes and voids formed in the tube 52 are widened as described above, and the internal adhesive is easily exposed. It is in a state. In this state, FIG.
As shown in (c), when the portions of the side edges 51a and 51b overlapping vertically above and below the adjacent water impermeable sheet 51 are rolled from above by a roller or the like, the gap between the overlapping side edges 51a and 51b is reduced. Seawater is extruded from the
2 leaks the adhesive, and the overlapping side edges 51a, 51b
An adhesive is applied between them. At this time, since the water between the overlapping side edge portions 51a and 51b is extruded and the adhesive is applied, the influence of water on the adhesive force of the adhesive can be reduced. Therefore, even if the adhesive is applied in water and cured, the impermeable sheet 51
It is possible to obtain an adhesive strength required for bonding between them.

As described in the first example, the adhesive is
Even when cured in water, it exhibits sufficient water-blocking properties, so that the joint between adjacent water-blocking sheets 51 bonded with an adhesive has sufficient water-blocking properties. Further, similarly to the first example, the joining of the impermeable sheets 51 and the securing of the waterproofness of the joined portion are performed in the water after laying the impermeable sheet in the water without using the welding of the impermeable sheet 51. Therefore, it is possible to prevent a problem that occurs when the impermeable sheet 51 is welded on water.

In the laying structure of the impermeable sheet of the second example, after the impermeable sheets 51 are joined to each other as described above, the overlapping side edges 51a, 5a of the adjacent impermeable sheets 51 are formed.
An adhesive may be applied so as to cover the periphery of the upper side edge portion 51a of 1b. That is, the upper side edge portion 51a
By applying a thick adhesive over the water-impervious sheet 51 from the lower side, the overlapping side edge portions 5 are formed in the same manner as in the first example.
Water can be prevented from entering between the two, and the water stopping performance can be further enhanced.

Further, the second example is not limited to the above-described one, and may be modified as shown in FIGS. 18 (a) and 18 (b) in order to further increase the waterproofness and the joining strength. Good. In this modification, the configuration described below is further added to the configuration of the above-described second example, and has the same configuration as that of the second example except for the configuration described below. Things. As shown in FIG.
In the modified example, the side edge portion 5 of the overlapping water impermeable sheet 51
The sealing sheet 70 is stuck on 1a, 51b. The sealing sheet 70 is formed to be slightly longer than the water-impervious sheet 51 so that the left and right ends cover the left and right ends of the adjacent water-impervious sheet 51. The left and right ends of the sealing sheet 70 are
The width is wider than the center, and the adjacent impermeable sheets 51
The end of the overlapping portion and its periphery can be integrally covered. The sealing sheet 70 has, for example, an adhesive surface on the lower surface, and is placed on the water-impervious sheet 51 so as to extend from the upper side edge 51 a of the water-impervious sheet 51 to the lower water-impervious sheet 51. It is stuck on. The lower surface of the sealing sheet 70 does not have to be an adhesive surface with an adhesive or the like. An adhesive may be applied to the water-impervious sheet 51 or the lower surface of the sealing sheet 70 and applied to the water-impervious sheet 51.

FIG. 18 shows a state before the overlapping portion of the adjacent impermeable sheet 51 is pressed, and in a modified example, the drain pipe 71 overlaps the side edge portion 51 in this state.
Although it is sandwiched between a and 51b, when the joining is completed, the drain pipe 71 is removed.

Next, a method of laying a water-impervious sheet in this modified example will be described. First, similarly to the case of the second example, the water-impervious sheet 51 is laid and the adhesive is fed to the pipe 52.
In laying the water impermeable sheet 51, the drain pipe 71 is sandwiched between the overlapping side edges 51a and 51b of the adjacent water impermeable sheet 51. In this case, the drainage pipe 71 may be provided separately from the water-impervious sheet 51, or the drainage pipe 71 may be attached to the water-impervious sheet 51 similarly to the pipe 52, and the drainage pipe 71 may be provided together with the water-impervious sheet 51. May be installed. However, as described later, the drainage pipe 71
Is to be removed later, the drain pipe 71 needs to be detachably attached to the impermeable sheet 51.

Then, at least the adjacent impermeable sheet 51
Is completed, the sealing sheet 70 is attached to the joint portion between the adjacent water-blocking sheets 51 as described above.
Next, similarly to the second example, the overlapping portion of the adjacent impermeable sheet 51 is rolled. At this time, the overlapping portion is the sealing sheet 7
0, it is difficult for water to escape from the pressed overlapped portion.
1 is connected to a pump to suck water from between the overlapping side edges 51a and 51b of the impermeable sheet 51, thereby easily draining water from between the overlapping side edges 51a and 51b. Thus, an adhesive can be applied between the side edge portions 51a and 51b in the same manner as in the second example. Further, when the overlapping portion is rolled from the end side of the water-impervious sheet 51, the drain pipe 71 is drawn out in accordance with the rolling speed so that the drain pipe 71 is removed from the portion to be rolled. It is removed from the overlapping portion of the water impermeable sheet 51.

According to the above-described modification, at the overlapping portion between the adjacent water impermeable sheets 51, the water impermeable sheets 51 are joined by the adhesive as shown in the second example, and the joining portion is formed. Water is stopped, and the joint portion is a sealing sheet 7.
Since it is covered with 0, the water stoppage can be further enhanced. In addition, the sealing sheet 70 is used in the water to prevent the impermeable sheet 5.
Since it is affixed to the joint portion of No. 1, large joining strength cannot be expected, but it is possible to reinforce the joining between the water impermeable sheets 51 to some extent to increase the joining strength.

In the above modification, the drain pipe 71
As with the pipe 52, the material may have a large number of holes and voids, and water may be sucked at portions other than the end of the drain pipe 71. Further, the water may be pushed out from the drain pipe 71 by the compaction without connecting the pump to the drain pipe 71. Further, the drainage pipe 71 may be applied to the above-described second example to discharge water from between the overlapping side edge portions 51a and 51b.

[0072]

According to the laying structure of the impermeable sheet according to the first aspect, the junction between the impermeable sheets can be brought into a water-stopped state without the need for welding on water. In addition, the construction work of laying the impermeable sheet is facilitated, and the construction period and cost can be reduced.

According to the laying structure of the impermeable sheet according to the second aspect, the same effect as that of the first aspect can be obtained, and also, it is possible to join the impermeable sheets and stop the water at the joined portion in water.
According to the laying structure of the water-impervious sheet according to the third aspect, since the water-impervious sheets to be joined can be filled with a cured product having adhesiveness while expelling water, the joining strength can be increased. According to the laying structure of the water-blocking sheet according to the fourth aspect, the same effect as that of the third aspect can be obtained, and the waterproofness can be further enhanced by the sealing sheet.

According to the laying structure of the impermeable sheet according to the fifth aspect, the same effects as those of the first to fourth aspects can be obtained, and by using the cured product as an adhesive, another cured product such as concrete can be obtained. As compared with the above, it is possible to shorten the construction period due to the quick curing property, and it is possible to obtain a high water stopping property by the cured adhesive. According to the method of laying a water-blocking sheet according to the sixth aspect, the same effects as those of the first to fifth aspects can be obtained.

[Brief description of the drawings]

FIG. 1 is a drawing showing a landfill area of a waste disposal site to which a laying structure and a laying method of a seepage control sheet according to a first embodiment of the present invention are applied.

FIG. 2 is a drawing showing a laying structure and a laying method of a seepage control sheet according to the first embodiment.

FIG. 3 is a view showing a laying structure and a laying method of a seepage control sheet according to a modification of the first embodiment.

FIG. 4 is a view showing a laying structure and a laying method of a seepage control sheet according to another modification of the first embodiment.

FIG. 5 is a view showing a bottom portion of a landfill area in the laying structure and laying method of the impermeable sheet.

FIG. 6 is a view showing a block forming the bottom part.

FIG. 7 is a view showing a block forming the bottom.

FIG. 8 is a view showing a laying structure and a laying method of a seepage control sheet on a slope portion of the landfill area.

FIG. 9 is a view showing a laying structure and a laying method of a seepage control sheet on a slope portion of the landfill area.

FIG. 10 is a view showing a boundary portion between a slope portion and a bottom portion of the landfill area.

FIG. 11 is a view showing a laying structure and a laying method of a seepage control sheet at a boundary portion between a slope portion and a bottom portion of the landfill area.

FIG. 12 is a view showing a laying structure and a laying method of a seepage control sheet at a boundary portion between a slope portion and a bottom portion of the landfill area.

FIG. 13 is a view showing a laying structure and a laying method of a seepage control sheet on a slope portion of a landfill area according to a second embodiment.

FIG. 14 is a view showing a laying structure and a laying method of the impermeable sheet.

FIG. 15 is a view showing a laying structure and a laying method of the impermeable sheet.

FIG. 16 is a view showing a laying structure and a laying method of the impermeable sheet.

FIG. 17 is a view showing a laying structure and a laying method of the impermeable sheet.

FIG. 18 is a view showing a laying structure and a laying method of a seepage control sheet according to a modification of the second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 water-impermeable sheet 11a side edge of water-impermeable sheet 11b side edge of water-impermeable sheet 13 bolt 15 adhesive (cured material) 16 adhesive (cured material) 17 adhesive (cured material) 19 adhesive (cured material) DESCRIPTION OF SYMBOLS 20 Underwater concrete (hardened material) 31 Waterproof sheet 33 Waterproof sheet 37 Underwater concrete (hardened material) 38 Underwater concrete (hardened material) 51 Waterproof sheet 51a Side edge of waterproof sheet 51b Side edge of waterproof sheet 52 Pipe 70 Sealing sheet

Claims (6)

[Claims] Claims: 1. A laying structure of a water-impervious sheet laid underwater on a bottom surface of a waste disposal site for landfilling wastewater in seawater or the like, wherein a plurality of water-impervious sheets are disposed in the waste disposal site. While laid on the bottom surface, the side edges of the water-impervious sheets adjacent to each other are arranged so as to overlap vertically, and the overlapping part of the water-impervious sheets adjacent to each other is stopped by a cured product cured in water. A structure for laying a seepage control sheet. 2. The water-impervious sheet laying structure according to claim 1, wherein the water-impervious sheets are fixed to each other by a plurality of fixing members that penetrate an overlapping portion between the water-impervious sheets and are fixed to a bottom surface of a waste disposal site. And the cured product is at least a peripheral portion of the penetrating portion of the fixing member among the overlapping portions of the water impermeable sheets, and a side edge of the water impermeable sheet raised at the overlapping portion of the water impermeable sheet. And a water-impervious sheet laying structure provided so as to cover the periphery of the sheet. 3. The water-impervious sheet laying structure according to claim 1, wherein an adhesive before curing is internally provided between adjacent side edges of the water-impervious sheet in an overlapping portion of the water-impervious sheets adjacent to each other. While the cured product is filled, a tube having a large number of holes through which the cured product can leak to the outside is arranged, and by pressing an overlapping portion of the impermeable sheet sandwiching the tube, the tube is removed from the tube. By leaking and hardening the cured product, the adjacent water-blocking sheets are joined together, and the overlapping portion of these water-blocking sheets is blocked by the cured product. Laying structure. 4. The water-impervious sheet laying structure according to claim 3, wherein a side edge of the water-impervious sheet which is raised at least at an overlapping part of the water-impervious sheet among overlapping parts of the water-impervious sheets adjacent to each other. And a sealing sheet attached to the overlapping portion or a cured product cured so as to cover the periphery thereof. 5. The laying structure of a waterproof sheet according to claim 1, wherein the cured product is an adhesive. 6. A method for laying a water-impervious sheet using the water-impervious sheet laying structure according to any one of claims 1 to 5, wherein the water-impervious sheet is laid on the underwater bottom surface of the industrial waste disposal site. The water sheet is laid, and the side edges of the water-impervious sheets laid adjacent to each other are vertically overlapped, and the cured product is cured in water at the overlapping portion of the water-impervious sheet, whereby the overlapping is performed. A method of laying a water-blocking sheet, characterized in that a part is in a water stopped state.