JP3639893B2 - How to install underwater sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underwater installation method for a sheet-like material laid on the bottom of a water, for example, to prevent sucking out or preventing sediment from flowing out.
[0002]
[Prior art]
In general, sheets such as water shielding sheets for preventing sucking of rubble foundations for underwater structures such as breakwaters, preventing sediment runoff from underwater structures, and bag materials used as containers for placing concrete on the bottom of the water A shape is laid on the bottom of the water.
[0003]
Conventionally, when this type of sheet-like material is laid on the bottom of the water, it is sunk in the bottom of the water in a folded state so as not to be washed away, and is deployed by a diving operation by a diver and moved to a predetermined position for positioning.
[0004]
[Problems to be solved by the invention]
In such a conventional method, since the resistance of the water is large in the deployment and movement of the sheet-like material at the bottom of the water, the method that relies on the manual work by the diver would impose heavy labor on the diver. There is a problem that workability is poor and many workers are required, and the cost is inevitably high.
[0005]
In view of such a conventional problem, the present invention aims to provide an underwater laying method for a sheet-like material that can easily be deployed and installed on the bottom of the sheet-like material without imposing a lot of burden on the diver. It was made.
[0006]
[Means for Solving the Problems]
To solve the above-mentioned conventional problems, characteristics of the water method of installing sheet material according to the present invention for achieving the intended purpose, the sheet to be placed in water the water bottom, etc., internal One or a plurality of water injection bags that are swelled into a predetermined shape by irrigating water and exhibit shape retention properties are removably fixed, and the water is laid down without water being poured into the water injection bag. After being lowered to near , water is poured into the water injection bag to expand the sheet material into a predetermined shape by inflating the water injection bag, and then the water injection bag is removed from the sheet material, the sheet-like material lies in you recover water injection bag leaving in a state of being expanded on the water bottom.
[0007]
The sheet-like material may be a water shielding sheet for preventing suction or the like laid on the bottom of the water such as the bottom mound slope, and is a bag material for injecting a filler such as concrete into the inside. May be.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 to 2 show an embodiment in the case of installing a sheet-like object composed of a water shielding sheet for preventing suction of a discarded stone foundation formed on the bottom of the water. In the drawings, 1 is a sheet to be laid on the bottom of the water. A plurality of water injection bags 2, 2... Are detachably fixed to the sheet-like material 1 in advance. The water injection bag 2 is formed into a hollow bag shape by a material mainly composed of a flexible material such as rubber, synthetic rubber, or an impermeable canvas sheet, and is inflated to maintain a predetermined shape by water injection. It has a structure.
[0009]
In this way, the water injection bag 2 is fixed to the sheet-like object 1 in advance, and the water injection bag 2 is suspended by a crane as shown in FIG. . Then, as shown in FIG. 3 (B), after being lowered to near the laying position of the bottom 3, water is poured from the pump on the work ship into the water injection bag 2 through the water injection / drain hose 4, and the water injection bag 2 is inflated. The sheet-like product 1 is developed into a predetermined shape by the development force at this time . Thereafter, as shown in FIG. 3 (c), the water injection bag 2 is removed from the sheet-like material 1 , and the sheet-like material is left expanded on the bottom surface of the water, and the water injection bag 2 is drained and recovered. And reuse it.
[0010]
In the above-described embodiment, the laying of the water-impervious sheet has been described, but it can be similarly deployed and installed even in a bag material used as a mold for casting and molding a concrete anchor on the water bottom.
[0011]
【The invention's effect】
As described above, in the underwater installation method for a sheet-like material according to the present invention, the sheet-like material to be installed in the water such as the bottom of the water is inflated into a predetermined shape by injecting water into the inside, thereby exhibiting shape retention. One or a plurality of water injection bags to be removed are fixed in a removable manner, the water is allowed to settle in a state where water is not poured into the water injection bag and lowered to near the laying position of the bottom of the water. The sheet material is expanded to a predetermined shape by inflating the water injection bag , and then the water injection bag is removed from the sheet material, leaving the sheet material expanded on the water bottom. By collecting the water injection bag, the deployment of the sheet-like material can be simplified without requiring the labor of a diver, and the deployed sheet-like material can be maintained in a deployed state by the expansion of the water injection bag. Is demonstrated Because the shape can be stably performed underwater operations such as position adjustment to a predetermined position easily and safely.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of a sheet-like material used in the present invention.
FIG. 2 is a sectional view showing a developed state of the above.
FIGS. 3A to 3C are side views showing a laying work process. FIGS.
[Explanation of symbols]
1 Sheet-like material 2 Water injection bag 3 Water bottom 4 Water drainage hose

Claims (3)

One or a plurality of water injection bags that are inflated into a predetermined shape by injecting water into the sheet-like material to be placed in the water such as the bottom of the water and exhibit shape retention are removably fixed, After submerging the water without pouring into the water injection bag and lowering it to near the laying position of the water bottom, water is poured into the water injection bag and the water injection bag is expanded to expand the sheet-like material into a predetermined shape. And then removing the water injection bag from the sheet-like material and leaving the sheet-like material in an expanded state on the water bottom to collect the water injection bag. .   2. The method for installing a sheet-like material in water according to claim 1, wherein the sheet-like material is a water shielding sheet for preventing suction or the like laid on the bottom surface of a water bottom mound slope.   The method for installing a sheet-like material in water according to claim 1, wherein the sheet-like material is a bag material for injecting a filler such as concrete into the inside.

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