JPH04146314A - Construction method for impermeable sheet - Google Patents

Abstract

PURPOSE:To facilitate execution by settling sheets while deflating float tubes mounted on the impermeable sheets so that they are capable of loading and unloading upon joining units of a plurality of impermeable sheets with each other in a required wideness on the water. CONSTITUTION:Sheet rolls 1 are mounted on a sheet roll receiving holder 2, central axles of the rolls 1 are set horizontally to an axle receiver of the holder 2, impermeable sheets 5 are delivered to the waterside by a sheet delivery roller 6, they are joined in a specific wide unit, and float tubes 14 are mounted at proper intervals to float all the sheets 5 horizontally. After that, the sheets 5 are properly bent to tow them to a specific position, the sheets 5 are spread over, fixing ropes 13 are fixed with anchors 19, and they are set on a specific water. Then, the tubes 14 are extracted on board while deflating the tubes 14, and the sheets 5 are settled.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an economical water-shielding sheet that is bonded to a desired size and deposited on the bottom or slope of a waste treatment plant, etc. This relates to the installation method.

[Conventional technology]

In recent years, when building industrial waste treatment plants etc. in closed waters,
If the waste contains water-soluble hazardous substances, the problem of contaminating the surrounding environment will occur. Laying of sheets is being carried out.

Conventionally, when laying a water-shielding sheet, the sheet is floated from one shore to the other shore and pulled with a winch, and then the sheet is pulled in the same way adjacent to this, and the sheet is placed on the water or on a work boat. After joining, the sheets were submerged.

In this conventional method, the sheet is pulled with a winch, so the strength of the sheet needed at the time of laying is greater than the strength of the sheet after it is laid, so a sheet with greater strength is used, which is not economical. There was a problem.

In addition, by arranging vertical ropes on the water-shielding sheet at predetermined intervals and further attaching horizontal ropes, the tensile strength of the large water-shielding sheet is absorbed by the lattice-like net structure made of these ropes. A method of laying a water sheet was disclosed in Japanese Patent Application Laid-open No. 61-5109, but this method also required a reinforcing member such as a rope, resulting in an economical problem.

[Problem to be solved by the invention]

The present invention has been made in order to solve the above-mentioned conventional problems, and aims to provide an economical method for laying a water-shielding sheet that does not apply excessive force to the water-shielding sheet being laid. This is a problem to be solved.

[Means to solve the problem]

As a means for solving the above-mentioned problems, the method for laying a water-shielding sheet of the present invention involves joining a plurality of water-shielding sheets into a unit of a predetermined size by crimping or sewing by appropriate means, and then each At predetermined intervals on the water-shielding sheet of the unit,
Multiple float tubes such as airtight hoses are removably attached using ring-shaped attachment ropes and floated on the water surface, either as they are, or with the sheet shortened in the direction perpendicular to the float tube. After transporting the units by towing or other methods to a predetermined installation location, the units of the above-mentioned water-shielding sheets are joined together by crimping, sewing, etc. to the required width on the water, and the water-shielding sheets are attached while removing air from each float tube. It is characterized by the fact that it is submerged.

The deflated float tube can be easily pulled out onto the water from the submerged waterproof sheet.

According to the above-mentioned laying method, no unreasonable force is applied to the sheet while it is being transported or sunk, and a water-shielding sheet of the required area can be obtained in any shape and size by joining on the water. It turns out.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A series of work procedures in an embodiment in which a water-blocking sheet is laid in a closed water area using the laying method of the present invention will be described below with reference to the drawings.

First, a water-blocking sheet (
In the following explanation, for the sake of convenience, we will simply refer to the sheet as a sheet). After inserting a mandrel in the center of a sheet with a width and length suitable for transportation, making it into a roll sheet and transporting it to the site, this sheet roll 1 , Figure 1, Figure 2 and Figure 3.
A temporary sheet roll holder as shown in the figure is placed on a pedestal 2. In this case, the center shaft of the sheet roll 1 is attached to the shaft support of the frame 2 in a horizontal direction as shown in FIGS. 1 and 2, or in a staggered manner in the vertical direction as shown in FIG. shall be set.

Next to the set sheet roll 1, a temporary sheet joining frame 4 is made of wood or the like horizontally or slightly inclined as shown in the figure, and the sheet 5 is pulled appropriately below the sheet joining frame 4 for sheet feeding. The roller 6 is set on the temporary pedestal 7.

In the sheet feeding roller 6, a roller support stand 8 for a bearing roller 12 is set on a temporary pedestal 7, a track roller 9 and a roller support roller 10 are placed on top of the stand 8, and a weight roller 1 is placed on top of that. The sheet 5 is inserted between the weight roller 11, the track roller 9, and the receiver roller 10, and when the track roller 9 is rotated, the sheet 5 is sent out due to friction between the rollers.

Although this embodiment describes a method of manufacturing on land, it is also possible to carry out similar work on a barge or the like.

Next, to explain the transportation of the sheet 5 joined into a unit of a predetermined size as described above, first, as shown in FIG. Install them at appropriate intervals.

Next, in order to float the entire sheet 5 of such a unit on the water surface during transportation by towing, float tubes 14 such as soft airtight hoses that act as floats when filled with air are attached at appropriate intervals on the sheet 5. .

For this installation, ropes 15 for installation are attached to the seat 5 at appropriate intervals on the line on which the float tube 14 is to be attached, and the float tube is placed inside the loop of the rope 15.
At this time, the float tube 4 and the mounting opening 115 are loose.

Therefore, each float tube 14
It can be inserted as if sewing through the loop made in step 15.
Conversely, it can be attached to and detached from the seat 5 by pulling it out.

Then, by attaching the float tube 14 to the sheet 5 at the water's edge or on a barge, the entire sheet 5 is floated on the water surface, and in this state, as shown in FIG. Rope 16
However, if the length is too long, it is bent appropriately and transported in this state by being towed by the tugboat 17 to a predetermined laying position.

Next, on the water surface where the sheet 5 is laid, untie the rope 16 that tied the sheet 5, spread the sheet 5 as shown in Fig. 17, fix the fixing rope 13 in an appropriate direction with the anchor 19, and place it on the water surface. Set to .

When submerging the seat 5 in this state, remove the air from the float tube 14 while
All you have to do is remove them one by one onto the ship.

Furthermore, each unit of the plurality of sheets 5 transported to a predetermined installation position in this way is floated on the water surface W of the water body,
As shown in FIGS. 6 and 7, the end of the sheet 5 is allowed to hang down into the water by an appropriate length from the float tube 14 at the end.

At this time, the float tube 14 at the end is sized to provide enough buoyancy to withstand the weight of the suspended sheet 5 in water.

In order to lift the end portion of the sheet 5, single lifting buoys 2° are attached at appropriate intervals.

Two sheets 5 floating on the water surface W in the above state are brought close to each other at an appropriate interval to prepare a two-pronged work boat 21 for sheet joining shown in FIG. 8.

A working deck 22 of an appropriate height is provided under the forks at the front of this two-pronged work boat 21, and the two-pronged work deck 22 is installed at an appropriate height to match the spacing between the single buoys 2o for lifting the end of the sheet. In order to lift the sheet 5, a plurality of hooks 23 are connected to the sear 25.
It is equipped with two prongs 24 supported by

Therefore, as shown in FIG. 9, the two-pronged work boat 21 is inserted between the two floating sheets 5, and the three-pronged work boat 21
The front of the sheet 5 was set at the end of the sheet 5, the four individual lifting buoys 20 were lifted up, the sheet 5 was set on the work deck 22, and the two sheets placed on the work deck 22 were placed on the work deck 22. The respective ends of the sheets 5 are joined by a worker using an appropriate tool by crimping, sewing, or the like.

Next, the above operation is repeated while moving the three-pronged work boat 21 backward to join the two sheets 5 on the water, and such operations are performed sequentially to join the required number of units of the sheets 5 on the water. While doing so, make the sheet 5 the required size.

In addition, when joining another sheet 5 to the sheet 5 that has already sunk to the bottom of the water, set an appropriate number of float tubes 14 at the end of the sheet 5 on the bottom of the water with the air removed,
Air is introduced into the float tube 14 to float only the end of the sheet 5.

In this case, a single buoy 2 for lifting the end of the sheet
0 shall also be attached.

Then, only the end portion of the existing sheet 5 is floated, and the end portion of the sheet 5 to be joined to the existing sheet 5 is placed on the water surface W at an appropriate interval, and the sheet 5 is joined on the water using the same procedure as described above.

Next, remove the single buoy 2° for lifting the end of the seat,
While removing the air inside the float tubes 14, the float tubes 14 are sequentially pulled out onto the ship, and the seat 5 is sunk to the bottom of the water.

Here, in the case of a slope, stakes for fixing the sheet 5 are arranged at appropriate intervals on the shoulder of the slope, and after tying the fixing rows 113 at the ends of the sheet 5 to the stakes, the float tube 14 The air is removed and the sheet 5 is submerged.

〔Effect of the invention〕

According to the above-described method for laying a water-shielding sheet of the present invention, no excessive force is applied to the water-shielding sheet during the transportation and sinking work of the water-shielding sheet, so that the sheet strength required after installation is sufficient. A water-shielding sheet that is cheaper than before can be used, and reinforcing members such as ropes can be simplified, resulting in an economical effect.

Further, since a water-shielding sheet of a required size can be obtained by joining on water, the method of the present invention can be effectively applied even when the place where the water-shielding sheet is laid is not rectangular.

Furthermore, since only the ends of the water-shielding sheet submerged at the bottom of the water can be raised and joined, there is the advantage that work can be carried out regardless of the weather.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of a series of work steps in an embodiment in which a water-blocking sheet is laid in a closed main area using the method of laying a water-blocking sheet of the present invention. A side view of the sheet rolls arranged horizontally in a staggered manner when manufacturing a water-shielding sheet in a unit, Figure 2 is a plan view of Figure 1, and Figure 3 is a side view when manufacturing a water-shielding sheet in the same way as Figure 1. Fig. 4 is a perspective view showing the water-shielding sheet spread out on the water surface, and Fig. 5 is a perspective view showing the water-shielding sheet in Fig. 4 being towed and transported. Figure, 6th
The figure is a side cross-sectional view showing the floating state of the ends of the seepage-shielding sheet, Figure 7 is a plan view showing the state where a two-pronged work boat is inserted between the ends of the seepage-shielding sheet, and Figure 8 is a side sectional view showing the floating state of the end of the seepage-shielding sheet. FIG. 9 is a side view of the self-propelled two-pronged work boat, and is a plan view showing the state of the work of joining water-shielding sheets on the water. 5...Waterproof sheet, 14...Float tube, 1
5... Robe (for installation), 17... Tugboat, 21.
... Two-pronged work boat, 22... Work deck.

Claims (1)

[Claims] A plurality of float tubes are removably attached at predetermined intervals on a water-shielding sheet joined to a unit of a predetermined width, and after being transported to a predetermined installation position while floating on the water surface, A method of laying a water-shielding sheet in which the sheet units are joined together on the water to the required width, and then the water-shielding sheet is sunk while removing air from each float tube.