JP2003033745A - Connection method for water barrier sheet and water barrier sheet used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that the operation of connecting a water barrier sheet in which a buoyant force is given by a float on a surface of the sea requires much trouble. SOLUTION: In a connection method for the water barrier sheet, after asphalt-based sheet materials are settled down on the sea bottom, the both adjacent sheet materials are connected with asphalt at least in the vicinity of the connection end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining water-impermeable sheets used for a water-impervious structure in a sea area (a concept including water areas) such as a landfill waste disposal site, and a water-impermeable sheet used therefor.

[0002]

2. Description of the Related Art For example, in a waste disposal site in which the ocean is landfilled, the bottom of the disposal site is covered with a water-blocking sheet so that sewage does not leak from the disposal site. For that reason, a water-blocking sheet is laid at the disposal site, but when laying it, a plurality of sheet materials must be connected to cover a vast area.

Therefore, as shown in FIG. 10, the connection is made by attaching a plurality of floats 100 to a sheet material 101.
We are constructing a vast impermeable sheet by joining adjacent sheet materials in a floating state.

[0004]

According to such a conventional technique, it is necessary to float each sheet material on the sea surface in order to join the water-impervious sheet, and therefore, when the float is attached to the sheet material, at the time of laying. It is necessary to remove the floats and collect the removed floats, which is a heavy burden for a large sheet material laid in a vast area.

Further, it is extremely difficult to accurately lay down the water-impermeable sheets that have been joined together and become very vast without sloping or wrinkling at fixed positions.

[0006]

In view of the above, the present invention is characterized in that a sheet material having at least a joint end portion made of asphalt is settled on the seabed and then adjacent sheet members are joined by asphalt. A water impervious sheet, which is a method for joining sheets, and is characterized in that a cloth-like body is impregnated with or coated with asphalt to obtain an asphalt-based sheet material.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First Embodiment Example FIG. 1 is an explanatory diagram showing a laying process, FIG. 2 is an explanatory diagram of a state in which asphalt is poured, FIG. 3 is an explanatory diagram of a joined state, and FIG. 4 is an explanatory diagram of a joined state.

Reference numeral 1 is a water-impervious sheet, which is an asphalt-based water-impervious sheet obtained by applying or impregnating asphalt to a cloth-like material. The water-blocking sheet 1 thus configured,
For example, as shown in FIG. 1, a roll is formed, and the roll is laid so that the seabed is rolled. The laying method is not limited to such a method, and may be any method depending on the place, weather conditions, and the like.

The water impermeable sheet 1 laid in this way is
Adjacent water-blocking sheets 1 are placed opposite to each other by overlapping their adjacent ends as shown in FIG. 3 or by abutting or leaving a gap as shown in FIG. Then, as shown in FIG. 3 and FIG. 4 described above by pouring the asphalt 3 toward the joint 2 so as to cover the ends thereof directly from the sea or via a pipe, the ends of the adjacent water-impervious sheets 1 are joined together. Are joined by asphalt 3. In this way, the laid water-impervious sheets 1 can be sequentially joined to form a watertight structure at the laid portion. After the installation is completed, the space is formed by draining the seawater inside the installation area,
Can be secured.

In the above structure, the entire surface of the water-blocking sheet 1 may be made asphalt-based only in the vicinity of the joint end without being made of asphalt-based. Reference numeral 4 is a protective layer provided on the installation surface side as required, and is made of various fibers such as natural fibers, synthetic fibers, metal fibers, or a woven or non-woven fabric made of a combination thereof.

Second Embodiment Example FIG. 5 is a plan view of a water-impervious sheet, and FIG. 6 is an enlarged cross-sectional view of a water-impervious sheet. In FIG. Two asphalt-based sheet materials 5 are stacked in a double layer, and if necessary, a mesh structure made of synthetic resin such as polyethylene, rubber, metal, or any other material as shown in FIG. The two sheet materials are hermetically sealed to form a bag with the flexible spacer 6 in an arbitrary state interposed.

Further, between the two sheet materials 5, as shown in FIG.
A synthetic resin such as a vinyl chloride material as shown in Fig. 1 and one end made of a flexible material such as rubber are closed, and a plurality of through holes 7 are formed in the periphery.
A plurality of pipes 8 provided with are arranged at predetermined intervals, and the pipes 8 are arranged in a plurality of blocks 91, 92, 93 ... 9n.
And each pipe 8 for each block is connected to an injection / exhaust pipe 10 so as to communicate with the outside. The bag-shaped water impermeable sheet 1 is constructed by projecting the opening end 11 from the side portion in the sealed state.

If all of the above-mentioned injection / exhaust pipes 10 are arranged so that the opening end 11 is located on one side of the water-blocking sheet 1, the workability of injection and exhaust afterwards is good. Also,
Each of the above-mentioned sheet materials may be used in the size of one sheet that can be produced in a factory as it is, or may be a sheet material that is spliced into one sheet. Reference numeral 12 denotes a protective layer which is provided as needed, and is made of a woven or non-woven fabric made of various fibers such as natural fibers, synthetic fibers, metal fibers, or a combination thereof on the surface that comes into contact with the laying surface.

The water-blocking sheet 1 having the above-described structure is extended on the sea surface of the laying site with the protective layer 12 facing down, and the blocks 91, 92, 93 ...
Air is introduced into the water-permeable sheet 1 by a 9-n pipe 8 to expand the sheet. Therefore, each injection / exhaust pipe 1
From 0 to the pipe 8, the air inside the sheet material is evacuated simultaneously or sequentially to the blocks, or conversely, seawater is injected into the blocks simultaneously or sequentially to the blocks via the injection / exhaust pipes 10 to shield the blocks. It is possible to inject seawater between the water sheets 1 to reduce the buoyancy of the water-blocking sheet 1, sink it into the sea, and lay it on the seabed.

In the above structure, when the spacer 6 is interposed in the water-impervious sheet 1, the water-impervious sheet does not have to be the first step of injecting air into the water-impervious sheet 1 in the above step. By extending 1, the spacer 6 forms a space in the water-blocking sheet 1 and the water-blocking sheet 1 can be expanded. In addition, in the above process, when injecting air, in order to ensure reliable expansion of the water-blocking sheet 1,
It is preferable to carry out sequentially from the block in front. Further, the suction and the injection of seawater may be sequentially performed from the front block in order to uniformly lay the water-blocking sheet 1 at a predetermined location without wrinkling.

The water shield sheet 1 laid in this way is
Adjacent water-blocking sheets 1 are placed opposite to each other by overlapping their adjacent ends as shown in FIG. 3 or by abutting or leaving a gap as shown in FIG. Therefore, as described above, by pouring the asphalt 3 toward the joint 2 directly from the sea or through the pipe so as to cover the end portions thereof, as shown in FIGS. Join the end comrades with asphalt 3. In this way, the laid water-impervious sheets 1 can be sequentially joined to form a watertight structure at the laid portion.

In order to join the joints with asphalt as described above, it is advisable that the connecting end portions of the double layers are formed by projecting one end portion of one sheet material into a flange shape, and only this portion is asphalt-based. May be configured as. Third Embodiment Example This embodiment example has a double structure, and as shown in FIG. 9, an asphalt-based sheet material 1
Two sheets 3 are stacked and sealed to form a bag-shaped reinforcing sheet 14.

Inside the reinforcing sheet 14, a bag-shaped inner sheet 16 in which two sheet materials 15 such as a rubber material, a vinyl chloride material, a thermoplastic elastomer-based material, and an asphalt-based material are stacked and sealed is internally provided. In the sheet 16, if necessary, in a flexible arbitrary state such as a mesh structure made of a synthetic resin such as polyethylene as shown in FIG. 7, rubber, metal or any other material as in the case of the second embodiment. The spacer 6 is enclosed.

In the thus formed inner sheet 16, one end portion made of a synthetic resin such as vinyl chloride material or a flexible material such as rubber as shown in FIG. 8 is closed, and a plurality of through holes 7 are formed in the periphery. A plurality of the provided pipes 8 are arranged at a predetermined interval, and the pipes 8 are provided with a plurality of blocks 9 as in the second embodiment.
9n, and each pipe 8 for each block is connected to an injection / exhaust pipe 10 and arranged so as to communicate with the outside. The opening end 11 is projected from one side of the inner sheet 16 in a sealed state, and the opening end 11 is further projected from one side of the reinforcing sheet 14 in a sealed state to form the water-impervious sheet 1. If all of the injection / exhaust pipes 10 are arranged so that the opening end 11 is located on one side of the water shield sheet 1, the workability of injection and exhaust afterwards is good.

Reference numeral 17 denotes the reinforcing sheet 14 and the inner sheet 16
It is a swelling material that is enclosed between the and if necessary, and is a material that solidifies or swells when absorbing water, such as bentonite or a water-swellable polymer. Reference numeral 12 is a protective layer provided as necessary, and is made of a woven or non-woven fabric made of various fibers such as natural fibers, synthetic fibers, metal fibers, or a combination thereof on the surface that comes into contact with the laid surface of the water shield sheet 1.

The water-blocking sheet 1 having the above-described structure extends in the same manner as in the above-mentioned embodiment, with the protective layer 12 down on the sea surface of the laying place, and each of the injection / exhaust pipes 10 and the blocks 91, 92. , 93 ... 9n, the pipe 8 is expanded by introducing air into the inner sheet 15. Therefore, the air is removed from each of the blocks from the injection / exhaust pipes 10 at the same time or in order by the pipe 8, or conversely, the blocks are simultaneously exhausted to the blocks by the pipe 8 via the injection / exhaust pipes 10. The seawater can be sequentially injected to inject the seawater between the inner sheets 16 to reduce the buoyancy of the water-impervious sheet 1 so that the water-impermeable sheet 1 can be sunk in the sea and laid.

In the above structure, when the spacer 6 is interposed in the inner sheet 16, the water impervious sheet 1 can be obtained without the first step of injecting air into the inner sheet 16 in the above step. By extending, the spacer 6 forms a space in the inner sheet 16 and the water-blocking sheet 1 can be expanded. The impermeable sheet 1 laid in this way is
Adjacent water-blocking sheets 1 are placed opposite to each other by overlapping their adjacent ends as shown in FIG. 3 or by abutting or leaving a gap as shown in FIG.

Therefore, as shown in FIGS. 3 and 4, the asphalt 3 is poured from the sea directly or through a pipe toward the joint 2 so as to cover the ends of the adjacent water-impervious sheets 1. Asphalt 3 with end comrades
Join by. In this way, the laid water-impervious sheets 1 can be sequentially joined to form a watertight structure at the laid portion.

According to this structure, when the swelling material 17 is enclosed, or when the reinforcing sheet 14 is damaged, the swelling material 17 is solidified or swelled by the infiltrated water and acts as a repair material for repairing the damaged portion. You can
Automatic repair is possible. Therefore, the swelling material 17 may be a material having a repairing function of repairing the sheet material with water.

In the above structure, the entire surface of the water-impervious sheet may be made asphalt-based only in the vicinity of the joint end without being made of asphalt-based.

[0026]

According to the present invention described in detail above, by constructing the impermeable sheet with an asphalt sheet material, the impermeable sheets adjacent to each other are joined by asphalt after the impermeable sheet is settled on the seabed. Therefore, it is possible to eliminate the need for the extremely difficult work of connecting the water-impervious sheets on the sea to form a vast water-impervious sheet and then setting it down.

Further, by forming the water-impervious sheet in the shape of a bag, the air in the water-impermeable sheet can be removed or water can be injected, and a large water-impervious sheet can be easily spread on the water surface. In addition, there is an effect that the expanded water-blocking sheet can be laid down at a predetermined position easily and accurately. Furthermore, by arranging a pipe with a plurality of through holes in the water-impervious sheet, the air in the water-impermeable sheet can be evenly sucked and the water can be injected, so that the air does not easily remain in the water-impervious sheet. It has the effect of improving the work efficiency of sedimentation laying.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a laying process according to a first embodiment.

FIG. 2 is an explanatory view of a state in which asphalt is poured.

FIG. 3 is an explanatory view of a joined state

FIG. 4 is an explanatory diagram of a joined state

FIG. 5 is a plan view of an impermeable sheet according to a second embodiment.

FIG. 6 is an enlarged cross-sectional explanatory view

FIG. 7 is an explanatory diagram of a spacer

FIG. 8 is an explanatory diagram of a pipe

FIG. 9 is an enlarged cross-sectional explanatory view of the water-blocking sheet according to the third embodiment.

FIG. 10 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 Impermeable sheet 2 joints 3 asphalt 4 protective layer 5 sheet materials 6 spacers 7 through holes 8 pipes 91, 92, 93 ... 9n blocks 10 Injection and exhaust pipes 11 Open end 12 Protective layer 13 sheet materials 14 Reinforcement sheet 15 sheet materials 16 inner sheet 17 Swelling material

Claims (9)

[Claims] 1. A method of joining water-impervious sheets, characterized in that at least the asphalt-based water-impervious sheet at least near the joining end is set down on the seabed and then adjacent water-impervious sheets are joined by asphalt. 2. The method for joining water-blocking sheets according to claim 1, wherein asphalt is poured from the sea so as to cover the joints of the water-blocking sheets directly adjacent to each other. 3. The method for joining water-impermeable sheets according to claim 1, wherein asphalt is poured through a pipe so as to cover the joints of the adjacent water-impermeable sheets. 4. The method of joining water-impermeable sheets according to claim 1, wherein the ends of the adjacent water-impermeable sheets are overlapped to form joints. 5. The method of joining water-impermeable sheets according to claim 1, wherein the water-impermeable sheets are jointly arranged so as to face each other by abutting the ends of the adjacent water-impermeable sheets or by leaving a gap therebetween. 6. The waterproof sheet according to claim 1, wherein the cloth-like body is impregnated with or coated with asphalt to form an asphalt-based sheet material. 7. A bag-shaped water impermeable sheet in which an asphalt-based sheet material is hermetically sealed, and a plurality of pipes having a plurality of through holes in the periphery thereof are arranged at predetermined intervals, and the pipes are divided into a plurality of blocks. The water impervious sheet according to claim 1, wherein each pipe of each block is connected to an injection / exhaust pipe to communicate with the outside. 8. The waterproof sheet according to claim 1, wherein the waterproof sheet has a double structure in which a bag-shaped inner sheet is housed in a bag-shaped reinforcing sheet. 9. The swelling material according to claim 7, wherein a swelling material is enclosed between the protective sheet and the inner sheet.
Impermeable sheet used for.