JPH04371607A - Laying method of water-shielding sheet - Google Patents

Abstract

PURPOSE:To reduce cost by installing water-shielding sheets to an intermediate float and a float for operation connected through a rope for movement at every fixed length between a float for front end operation and the land. CONSTITUTION:The front end section E of a water-shielding sheet 2 is fixed to a float 4 for front end operation with a hand winch 3, and the front of the float 4 is moored to an anchor 8. The sheet 2 is pulled in by a stretching rope 5, a float 11 for operation is floated between the float 4 and the land 1, the float 4 is moved to the front F, and the sheet 2 is installed to the float 11 and drawn in near the float 4, and an intermediate float 12 is mounted to the upper section of the sheet 2. The float 11 is pulled back near the land 1, the float 4 is further shifted to the front F, the sheet 2 is fitted to the float 11, and the sheets 2 are stretched successively to the front F. Accordingly, tension applied to the sheets 2 is lowered and thickness is thinned, thus reducing cost.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a water-shielding sheet on the bottom of a closed water area provided for dumping industrial waste and the like.

0002

[Prior Art] Conventionally, at the bottom of the closed water area as mentioned above,
To lay a water-shielding sheet, for example, as in the publicly known example such as Japanese Patent Publication No. 60-58330 regarding the method of laying a water-shielding sheet, multiple floats are attached to the tip of the sheet, ropes are attached to these floats, and the rope is tied. This was done by winding it up with a winch or the like.

However, in the conventional method described above, excessive tension is applied to the sheet, so it is necessary to make the sheet considerably thicker than necessary to achieve the original purpose of creating a watertight structure, which is said to be uneconomical. There was a problem.

0004

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to reduce the tension applied to the water-shielding sheet when laying the water-shielding sheet, thereby reducing the thickness of the sheet. The objective of this project is to provide an economical method for laying a water-shielding sheet that can be made thinner.

[0005]

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the method of laying a water-shielding sheet of the present invention is such that the water-shielding sheet is laid on land at one end of the water area where it is laid, or it is rolled up in advance. An appropriate number of intermediate work floats with a winch attached to which the tips of water-shielding sheets of the required width and length are attached are connected to the above-mentioned land via moving ropes. While attaching predetermined lengths of impermeable sheets that are drawn into the water from the land side to each of the floats and work floats with winches, the winding and unwinding of each moving rope by each of the winches and the operation of the tip work floats are carried out. It is constructed by repeatedly mooring with anchors and wires and moving forward as appropriate to extend the entire length of the water-shielding sheet in the water area in which it is to be laid, and then sinking the water-shielding sheet.

According to the above installation method, when pulling out the water-shielding sheet, the water-shielding sheet of a predetermined length attached to each of the tip work float, intermediate float, and work float is simply pulled, and the water-shielding sheet is pulled out. Do not apply excessive tension to the sheet.

[0007]

[Example] An example of the installation work performed by applying the method of installing a water-blocking sheet of the present invention will be described below with reference to the drawings. Figures 1 to 14 are for explaining the procedure of the work. FIG. 2 is a series of explanatory diagrams. First, as shown in FIG. 1, a water-blocking sheet 2 having a width and length required for installation is prepared by folding it on land 1 at one end of the installation water area.

[0008] Such a water-shielding sheet 2 may be prepared by wrapping it around a rope so that it can be easily pulled out. Next, the tip E of the water-shielding sheet 2 is attached to a tip working float 4 with a hand winch 3 floating on the water surface near the land 1.
The extension rope 5 has one end fixed to the work float 4, and the other end of the extension rope 5 is attached at a predetermined length from the tip E of the water-shielding sheet 2.

The front of this tip work float 4 is shown in FIG.
The wire is moored to the anchor shown at 8, and the rear is moored to a pile (not shown) on the land 1 with a wire, etc., and by winding the wire 7 on the anchor 8 side with the hand winch 3, it can be used for tip work. The float 4 is movable forward. Next, the water-blocking sheet 2 is drawn in via a guide roller 10 by a hand winch 3 of a working float 4, as shown in FIG.

[0010] It is preferable that the tension rope 5 is attached to the water-shielding sheet 2 at a position where the folded water-shielding sheet 2 does not come into contact with the water bottom B, and the water-shielding sheet 2 is not pulled in by the tension rope 5. , is not necessary when the moving distance of the tip work float 4 is made small. Next, as shown in FIG. 3, the second working float 11 is floated between the tip working float 4 and the land 1.

This second work float 11 has its front end connected to the tip work float 4 and the moving rope 6 so that it can be wound up and let out, and its rear end attached to a pile or the like on land 1 (not shown). It is moored with a wire or the like, and the second working float 11 is also equipped with a hand winch 3 similar to the tip working float 4. Next, Figure 4
As shown, the anchor 8 in front of the tip work float 4
By winding the wire rope 7 with the hand winch 3, the tip work float 4 is moved forward F.

Next, as shown in FIG. 5, the water-blocking sheet 2 is attached to the second working float 11, and the second working float 11 is pulled in close to the tip working float 4 using the hand winch 3. , the water-blocking sheet 2 is pulled in by the extension rope 5 shown in FIG. 2 as needed. Then, as shown in FIG. 6, the first intermediate float 12 is attached to the upper part of the water-shielding sheet pulled in by the second work float 11, and the second work float 11 is pulled back to the vicinity of the land 1.

Next, as shown in FIG. 7, after the anchor 8 of the tip work float 4 is moved forward, the tip work float 4 with the tip E of the water-blocking sheet 2 attached is further moved forward F. do. Then, as shown in FIG. 8, the water-blocking sheet 2 is attached to the second working float 11, and the second working float 11 is moved to the vicinity of the first intermediate float 12.

At this time as well, if necessary, the water-blocking sheet 2 is pulled in using the tension rope 5 shown in the procedure shown in FIG. Next, as shown in FIG. 9, the hand winch 3 of the tip working float 4 is wound to move the first intermediate float 12 to the vicinity of the tip working float 4. As shown in FIG. 10, a third
As shown in Fig. 11,
Attach the water-blocking sheet 2 to the working float 13, and pull the third working float 13 close to the second working float 11 using the hand winch 3. At this time, if necessary, follow the steps shown in Fig. 2. Waterproof sheet 2 with stretched rope 5
Perform the pull-in.

Next, as shown in FIG. 12, the tip working float 4 to which the tip of the water-blocking sheet 2 is fixed is further moved forward (not shown), and a second working float to which the water-blocking sheet 2 is attached is moved. 11 is moved to the vicinity of the first intermediate float 12, and the third working float 13 is pulled back. Then, depending on the length of the water-blocking sheet 2 to be laid, an appropriate number of intermediate floats 12, 14, etc. and work floats 11, 13, etc., each equipped with a hand winch 3, are installed from the land 1 side using a tip work winch. 4, and while attaching each predetermined length of the water-blocking sheet 2 drawn into the water from the land 1, winding and letting out the tensioned rope 5 using the hand winch 3 in the steps shown in FIGS. 10 to 12. and,
The mooring and forward movement of the tip work float 4 are repeated as appropriate.

After the entire length of the water-shielding sheet 2 has been expanded, the front end of the water-shielding sheet 2 is fixed to the other end of the water area, and the rear end T of the water-shielding sheet 2 is fixed as shown in FIG. land 1
The winch 15 winds the rope 17 through the rope guide pipe 16 and fixes it to the surface of the water bottom B. Next, as shown in FIG. 14, water is poured into the intermediate floats 12 and 14 to sink the water-shielding sheet 2 to the water bottom B, and the diver 18 places the sand weight 19 on the water-shielding sheet 2 to remove the water-shielding sheet 2. Fix it on the bottom B side of the water.

After the water-shielding sheet 2 is submerged, the intermediate floats 12 and 14 are separated from the water-shielding sheet 2 by a diver 18, air is injected into the intermediate floats 12 and 14, and the floats are floated and recovered. In this embodiment described above, the revetment has a steel sheet pile structure, and the revetment part is water-shielded, and the tip E and the end T of the water-shielding sheet 2 are fixed to the water bottom B. However, if the seawall is an embankment made of earth and sand, a water-shielding sheet is also laid on the slope of the embankment, and the tip E and the end T of the water-shielding sheet 2 are connected at the top of the embankment.
needs to be fixed.

[0018]

[Effects of the Invention] According to the above-described method for laying a water-shielding sheet of the present invention, when pulling out the water-shielding sheet for laying the sheet, all that is required is to pull the part of the water-shielding sheet suspended by the float. Since excessive tension is not applied to the water-shielding sheet, the water-shielding sheet can be made thinner, which has the effect of being economical.

[0019]

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating retraction of a water-blocking sheet by a float for working at the tip end of a water-blocking sheet in a laying work flow procedure performed by applying the water-blocking sheet laying method of the present invention.

FIG. 2 is an explanatory diagram of a state in which the water-blocking sheet of FIG. 1 is folded and drawn.

FIG. 3 is an explanatory diagram showing a second work float added after FIG. 2;

FIG. 4 is an explanatory diagram showing the movement of the tip work float after FIG. 3;

FIG. 5 is an explanatory diagram showing the second work float being retracted in the state shown in FIG. 4;

FIG. 6 is an explanatory diagram showing a state in which a first intermediate float is added after FIG. 5 and a second working float is pulled back.

7 is an explanatory view of moving the tip work float after anchor replacement after FIG. 6; FIG.

8 is an explanatory diagram of a state in which the second work float is moved after FIG. 7; FIG.

FIG. 9 is an explanatory diagram of moving the first intermediate float after FIG. 8;

10 is an explanatory diagram of a state in which a third work float is added after FIG. 9; FIG.

FIG. 11 is an explanatory diagram showing movement of the third work float in FIG. 10;

12 is an explanatory diagram illustrating the movement of the tip working float, the movement of the second working float, the movement of the second intermediate float, and the pulling back of the third working float after FIG. 11; FIG.

FIG. 13 is an explanatory diagram showing completion of expansion of the water-shielding sheet and retraction of the end portion of the water-shielding sheet after FIG. 12;

FIG. 14 is an explanatory diagram showing the work of sinking and fixing the water-blocking sheet after FIG. 13;

[Explanation of symbols]

1 land
2 Waterproof sheet 3 Hand winch 4 Float for tip work 6 Rope for movement
7 wire 8 anchor
11 Second working float 12 Intermediate float 1
3 Third work float 14 Intermediate float

Claims (1)

[Claims] Claim 1: Attach the tip of a prepared impermeable sheet of the required width and length to the land at one end of the water area, and place the tip of the sheet between the tip work float having a winch and the land. While attaching predetermined lengths of impermeable sheets that are drawn into the water from the land side to intermediate floats and work floats with winches that are connected in an appropriate arrangement via moving ropes, A method for laying a water-shielding sheet, in which winding and unwinding by each winch and mooring and forward movement of a tip work float are repeated as appropriate to extend the entire length of the water-shielding sheet, and then the water-shielding sheet is sunk.