JP3411630B2 - Underwater sheet laying method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a bottom surface and a slope surface to prevent water leakage from a waste disposal site constructed in the ocean and to prevent the caisson mound installed in the outer wall of a reclaimed seawall from sucking backfilled sand. The present invention relates to a method of laying a rubber or synthetic resin sheet to be laid.

[0002]

2. Description of the Related Art In order to lay a sheet on the bottom of a water surface, generally, the sheet is not laid down after the water in the laying area is discharged to expose the bottom surface, but the construction is performed with the water area left. Often, this involves spreading the sheet over the surface of the water and sinking it for laying.

In the laying method, a float is attached to a sheet so that the sheet floats on the water surface, the end of the sheet is pulled out by a towing device such as a winch and spread to the laying area, the float is removed, and the weight or weight of the sheet is removed. Is installed and settles on the bottom or slope to cover the laying area.

[0004]

According to the above technique, the sheet pulled out on the water surface is soft and widely spread, and the specific gravity thereof is close to that of water, so that it is difficult to settle the sheet. , It is very difficult to surely cover the installation area due to wrinkles or floating and to install it in the installation area.

Further, after the laying is completed, it is necessary to fix the end portion of the seat by a weight or the like in order to prevent the movement of the seat, and diving work in the deep sea area offshore which is increasing in number recently. There is a problem that the work becomes dangerous as well as difficult.

[0006]

Therefore, according to the present invention, a weight is attached to one end of a sheet, a plurality of flexible tubes are attached to the upper surface of the sheet, and the sheet is stretched in a laying area, and each tube is extended. By injecting a time-curable fluid material into the sheet, the sheets are brought into close contact with one another along the bottom surface shape of the laying area in order from the end portion of the sheet, and the sheet is fixed to the laying area by the weight of the fluid material after hardening. To do.

[0007]

[Operation] According to the above configuration, the wrinkle generated on the sheet during the expansion is caused by pressing the fluid material into the tube,
The wrinkles are extended to surely adhere to each other along the shape of the bottom surface, the laying area can be surely covered, and the sheet is fixed along the bottom surface due to hardening of the fluid material with time.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view showing a laid state, FIG. 2 is a side view, FIG. 3 is an explanatory view of a step of laying on a slope, FIG. 4 is an explanatory view of a step of laying on a slope, and FIG. FIG. 3 is an explanatory diagram of a process, in which 1 is a sheet, which is in the form of a film or net made of rubber, synthetic resin or the like.

A towing float 2 for pulling the sheet 1 by floating the tip of the sheet 1 at the tip of the sheet 1.
The float 2 is made up of a rigid body such as a steel pipe or a flexible float 2 in order to perform pulling simultaneously in the width direction.
In this case, a rigid material such as steel material may be attached separately. In addition, the float 2 does not necessarily have to be provided, and may be provided when it is necessary to improve workability.

On the other hand, at the rear end of the sheet 1, there is attached a weight 3 made of steel or the like for forcible sinking. Further, fixing portions 4 are provided on the surface of the sheet 1 at predetermined intervals in the width direction and the longitudinal direction, and flexible tubes 5 are supported by the fixing portions 4, and each tube 5 has a distal end. The seat 1 is open at the front end, and the rear part is integrated into a connection port 6.

The seat 1 thus constructed is folded in the longitudinal direction on the work boat 7 moored near the laying area,
At this time, it is preferable that the weight 3 at the rear end be the top end. Therefore, as shown in FIG. 3, the rear end of the seat 1 is evenly settled at a predetermined position by a crane 8 or a tugboat installed on the work boat 7.

Next, as shown in FIG. 4, the locking device 1a at the front end of the seat 1 is connected to a pulling device 9 installed on land via a wire 9a or the like, and the front end of the seat 1 is pulled while being pulled and extended. Let Although the tube 5 may be attached to the seat 1 in advance as described above, it may be fixed to the fixing portion 4 during the expansion. At the end of the expansion or during the expansion, the connection port 6 is connected to a pipe 10 for pressure feeding and connected to a press-fitting device 11 for a fluid material 12, such as concrete, which hardens with the passage of time.

Therefore, after the expansion is completed, the fluid material 12 is gradually pressed into the tube 5 from the press-fitting device 11 via the pipe 10, whereby the sheet 1 follows the shape of the bottom surface from the press-fitting side end portion due to its weight. Will be laid down sequentially. In the above description, the fluid material 12 was gradually pressed into the tube 5 after the expansion was completed.
It may be pressed into and gradually expanded.

After all the subsidence of the sheet 1 is completed, as shown in FIG. 5, the front end of the sheet 1 is fixed by the fluid material 12 flowing out from the front end opening of each tube 5. Further, when the fluid material 12 in each tube 5 is hardened, it becomes a weight along the bottom surface, and the laid sheet 1 does not move from the laying area, so that the fixed state of the entire sheet 1 is fixed. can get.

In the above description, the method of sinking the sheet from the sea side has been explained, but the same applies when the sheet is positioned and the fluid material is pressed in from the land side. According to the above configuration, the sheet 1 is spread in the laying area, and the time-curable fluid material 12 injected into each tube 5 attached to the sheet 1 is cured after the injection is completed, so that the sheet 1 is placed on the terrain of the laying area. It adheres closely and is fixed by its weight.

Further, the end portions can be fixed by hardening the fluid material 12 flowing out from the openings of the respective tubes 5, and no separate fixing work is required.

[0017]

According to the present invention described in detail above, a weight is attached to one end of a sheet, a plurality of flexible tubes are attached to the upper surface of the sheet, and the sheet is spread in the laying area. By injecting a time-curable fluid material into the tube, the sheet will be intimately adhered from the edge of the sheet along the bottom surface shape of the laying area, and the weight of the fluid material after curing will secure and secure the sheet. It has the effect of covering the laying area.

Further, if the tube at that portion is broken due to the wrinkles on the sheet, the fluid material will not flow out from the open end of the tube, and there is an effect that the laying condition of the sort can be estimated from the condition. Furthermore, even if a small amount of wrinkles is generated on the sheet during expansion, pressing the fluid material into the tube will cause the wrinkles to be extended and firmly adhere to the bottom surface shape. Even if it is the laying area, the laying area can be surely covered, and the work by the diver can be reduced, so that the work safety can be greatly expanded.

Further, since the end portion can be fixed by hardening the fluid material flowing out from the opening of each tube, there is an effect that no special fixing work is required, which reduces the large work on the seabed. Is the effect.

[Brief description of drawings]

FIG. 1 is a plan view showing a laid state showing an embodiment.

FIG. 2 is a side view.

FIG. 3 is an explanatory diagram of a process of laying on a slope.

FIG. 4 is an explanatory diagram of a process of laying on a slope.

FIG. 5 is an explanatory diagram of a process of laying on a slope.

[Explanation of symbols]

1 sheet 2 floats 3 weights 4 fixed part 5 tubes 6 connection 12 Fluid material

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02B 3/18 E02B 3/12 B09B 1/00

Claims (2)

(57) [Claims] 1. A weight is attached to one end of a sheet, a plurality of flexible tubes are attached to an upper surface of the sheet, the sheet is spread in a laying area, and a time-curable fluid material is injected into each tube. By doing so, the sheets are brought into close contact with one another along the bottom surface shape of the laying region,
A method for laying a sheet on a water bottom, characterized in that the sheet is fixed to the laying area by the weight of the fluid material after curing. 2. The laying of a water bottom sheet according to claim 1, wherein the tip of the tube is an open end, and the injected fluid material flows out from the open end to fix the open end to the laying area. Construction method.