JPH07268834A - Impervious sheet - Google Patents

Abstract

PURPOSE:To prevent an impervious sheet from floating up, by exposing air-paths connected to openings, at the rear face of a body and water-tightly arranging exhaust air cylinders provided with the openings which can be opened or closed, at the front face of the impervious sheet body. CONSTITUTION:An impermeable and flexible impervious sheet body 1 is made of vinyl chloride resin sheet or the like. Exhaust air cylinders 2 are formed with a rigid synthetic resin material. Air-paths connected to the openings of exhaust cylinders and connected to pierced holes formed in appropriate positions of the body 1 are exposed on the rear face of the body 1. These are arranged watertightly. A wire rope 5 having a float 4 at the front end is attached to the exhaust cylinder 2. In this way, entrapped air between the body 1 and the water bottom is purged into the water through the exhaust cylinders 2 and hence, the impervious sheet is prevented from floating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-blocking sheet laid on a landfill provided in a harbor, a coast, a river, a lake or the like, or on the inner surface of a revetment in an industrial waste treatment plant and the water bottom. .

[0002]

2. Description of the Related Art Conventionally, a part of the sea area and water area is surrounded by a seawall,
The earth and sand are buried inside it, or used as a place to put industrial waste, etc., but harmful components contained in the earth and sand that are put into the water dissolve in water and permeate through revetments and bottoms. Moreover, there is a concern that it may flow out into the surrounding sea area and water area, causing environmental pollution, which is not preferable.

Therefore, in order to prevent outflow of harmful components to the surroundings, it is practiced to lay a water-blocking sheet on the inner surface of the revetment and the bottom of the water.

In this laying, in order to lay the water blocking sheet over the inner surface of the revetment and the water bottom, for example, a plurality of water blocking sheet pieces are floated at predetermined positions on the water surface in the landfill and their side edges are floated. A common method is to join them together to form a wide impermeable sheet, and then settle the impermeable sheet and lay it on the bottom of the water and the inner surface of the revetment, but the landfill is vast and It is difficult to lay it without air intervening between it and the bottom of the water.

Further, when the impermeable sheet is laid, the plants and seafood inhabiting the water area are killed by being sandwiched between the bottom of the water and the impermeable sheet, and the spoiled gas causes the impervious gas. A large amount will be retained between the bottom and the bottom of the water.

When air or gas intervenes between the water-blocking sheet and the water bottom as described above, the water-impermeable sheet is difficult to settle due to the rising force, and the water-blocking sheet laid on the water bottom floats. .

Therefore, for example, as shown in FIG. 4, an exhaust pipe 3a having a tip portion inserted between a water-blocking sheet 1a and a water bottom 2a is placed along a slope 5a of the seawall 4a and a top portion 6 of the seawall 4a is provided.
A means for exhausting the gas interposed between the water-blocking sheet 1a and the water bottom 2a by being extended to a is adopted. However, the conventional exhaust means installs the exhaust pipe 3a along the revetment 4a, eliminates the gas in the vicinity of the revetment 4a, and eliminates the gas staying at a position away from the revetment 4a. It is difficult.

Therefore, it is preferable when the water blocking sheet is laid in a small area such as a reservoir, but when the water blocking sheet is laid over a wide area, the water blocking sheet 1a is used.
There is a problem that the gas interposed between the water and the water bottom 2a cannot be exhausted.

[0009]

The problem to be solved by the present invention occurs in the conventionally known water-blocking sheet when air is laid between the water-blocking sheet and the water bottom, or after the laying. The point is that it will rise due to rotting gas.

[0010]

The present invention has been made in order to solve the above-mentioned problems, and an exhaust pipe having an opening / closing opening at an appropriate position on the surface of a water-blocking sheet body communicates with the opening. It is characterized in that the passage is exposed in the back surface of the water-impermeable sheet body and arranged in a watertight state.

[0011]

With the opening placed at the tip of the exhaust pipe being opened, the water-impervious sheet body is sunk so that the air that has entered between the water-impermeable sheet body and the water bottom is discharged from the exhaust pipe into the water.

Further, the spoiled gas generated after installation is discharged from the exhaust stack.

After exhausting air or spoiled gas between the water-blocking sheet body and the bottom of the water, the opening located at the tip of the exhaust pipe is closed, and water containing harmful components permeates the bottom of the water to surround it. To prevent it from flowing into the sea and water.

In addition, when a spoiled gas or the like is generated thereafter, the opening located at the tip of the exhaust pipe is opened / closed and discharged.

[0015]

Embodiments of the present invention will now be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which the water-blocking sheet body 1 has water impermeability and flexibility, for example, a thickness of 1-10 mm and a width of 2-10.
m, a length of about 50 to 100 m, and a vinyl chloride resin sheet having a reinforcing layer made of a braid or the like as required.

The water-blocking sheet body 1 has a plurality of exhaust tubes 2 formed at appropriate positions on its surface.

The exhaust pipe 2 is made of a hard synthetic resin material such as hard vinyl chloride and has a diameter of 10 to 30c.
m, a height of 10 to 20 cm, and an exhaust pipe main body 22 having a flange 21 at the lower end, and a lid fitted in a watertight state in an opening 24 formed at the upper end of the exhaust pipe main body 22. The body 21 and the flange 21 are exposed on the back surface 12 of the water-permeable sheet body 1 in the through-hole 11 formed at a proper position of the water-permeable sheet body 1, and the peripheral edge portion 13 of the water-permeable hole 11 is attached to the outer periphery of the exhaust pipe body 22. It is attached in a watertight manner by a stainless band 3 or the like, which is started up alongside the surface and wound around them.

Further, a base end of a cord 5 having a float 4 for confirming the installation position of the exhaust pipe 2 is fixed to the exhaust pipe main body 22.

In this embodiment having such a structure, the water impermeable sheet body 1 is floated on the water surface by a well-known means to be floated on the water surface and floated. After being joined together at their side edges to cover most of the water surface, the buoyancy is removed and the water bottom 6 is settled and laid.

At this time, in the exhaust pipe 2, the cover 23 fitted to the tip of the exhaust pipe main body 22 is removed, and the water shield sheet main body 1 is sunk by leaving the opening 24 in the open state, so that the water shield sheet main body 1 is closed. The air that has entered between the water and the bottom of the water 6 is in the passage 2
It passes through 5 to the opening 24 and is discharged into the water.

Therefore, since there is no intervening air as a factor of ascending force between the water blocking sheet body 1 and the water bottom 6 as in the conventional case, the water blocking sheet body 1 can be settled very easily. .

At the initial stage of laying, the opening 24 at the tip is left open so that
Plants and seafood inhabiting the water area are sandwiched between the water bottom 6 and the water shield sheet body 1 and die, and a large amount of spoilage gas accumulated between the water shield sheet body 1 and the water bottom 6 is generated in the water. There is no concern that the water-blocking sheet laid on the bottom of the water will rise to the surface.

If there is no longer any concern that spoiled gas will remain between the water-blocking sheet body 1 and the water bottom 6 after a certain period of time, the lid body 23 is attached to the tip of the exhaust stack body 22.
The opening 24 is covered with a cover to prevent water containing harmful components from passing through the bottom 6 and flowing out to the surrounding sea area and water area.

Further, at this time, the fitting of the lid body 23 into the exhaust stack main body 22 is usually performed by a diver, but in this embodiment, in order to confirm the installation position of the exhaust stack 2 in the exhaust stack main body 22. The rope 5 having the float 4 is fastened.

Therefore, the diver can very easily confirm the position of the exhaust pipe 2 by handing the rope 5 from the float 4 floating on the water surface.

In particular, a shape different from the float for floating the water-blocking sheet main body 1 used for laying the float 4 on the water surface,
Alternatively, by using a color, the float 4 can be easily selected when removing the float for floating, so there is no concern that the float 4 will be removed together with the float for floating by mistake during installation.

In this embodiment, the exhaust body 22 and the lid body 23 are not connected to each other, and the lid body 23 may be laid with the lid body 23 removed and brought by a diver later. When the main body 22 and the lid body 23 are connected to each other, the work of covering the lid body 23 becomes easier.

FIG. 3 shows a different embodiment of the present invention. Unlike the above embodiment, the exhaust pipe 2 is made of a flexible material such as a vinyl chloride resin sheet similar to the water shield sheet body 1, for example. There is.

Further, unlike the above embodiment, the lid body 23 (see FIG. 2) is not provided.

In this embodiment, as shown in FIG. 3 (a), the exhaust pipe main body 22 is laid on the bottom of the water in a state where the tip of the main body 22 is opened in the same manner as in the above embodiment.

After the air and spoiled gas present between the water-blocking sheet main body 1 and the water bottom are discharged into the water through the exhaust pipe 2, the diver discharges them as shown in FIG. 3 (b). Close the cylinder body 22 and fold back the tip, then
As shown in FIG. 3 (c), the folded-back portion 2 is attached by a binding member 7 such as a rope or a rubber ring which is additionally provided or brought separately.
By binding 6 together, the opening 24 is closed,
It prevents water containing harmful components from passing through the bottom of the water and flowing out to the surrounding sea areas and water bodies.

As described above, this embodiment has the same operation and effect as the above-mentioned embodiment, but since the exhaust pipe 2 is made of a flexible material, it can be easily handled including storage and transportation. Easy to lay.

Further, the exhaust pipe 2 can be manufactured by a simple work of simply adhering the exhaust pipe 2 to the water-blocking sheet body 1 by means such as welding or adhesion, and it is economically very economical because no expensive parts are required. It is advantageous.

[0035]

EFFECTS OF THE INVENTION According to the present invention having the above-mentioned structure, there is no concern that the air will float up due to air entering between the water-blocking sheet and the water bottom during installation, or spoiled gas generated after installation.

Also, after the air or the spoiled gas between the water-blocking sheet body and the water bottom is discharged, the opening located at the tip of the exhaust pipe is closed so that the water containing the harmful components is kept in the water bottom. It is possible to prevent the water from penetrating through and flowing out to the surrounding sea area and water area.

Further, in the case where the structure is such that the base end of a cord having a float for confirming the installation position of the exhaust pipe is fixed near the exhaust pipe or the exhaust pipe of the water-blocking sheet body. In addition, the position of the exhaust stack can be confirmed very easily by the diver's hand-held rope from the float floating on the water surface, and the diving work with the opening of the exhaust stack closed is easy. Is something that can be.

[Brief description of drawings]

FIG. 1 is a perspective partial view schematically showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line YY of FIG.

FIG. 3 is a perspective partial view showing another embodiment of the present invention and its usage state.

FIG. 4 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 Water-impervious sheet body 2 Exhaust pipe 3 Locking member 4 Float 5 Strand

Claims (2)

[Claims] 1. An exhaust pipe having an openable / closable opening is provided at an appropriate position on the surface of the water-blocking sheet main body, with a passage leading to the opening being exposed in the back surface of the water-blocking sheet main body and in a watertight state. Impermeable sheet characterized by being 2. The base end of a cord having a float for confirming the installation position of the exhaust pipe is fixed near the exhaust pipe or the exhaust pipe of the main body of the water blocking sheet. Impermeable sheet.