JPS61290106A - Covering sheet for dam - Google Patents

Abstract

PURPOSE:To prevent the breakage of a covering sheet by a method in which the loosened portion of a covering sheet is set on the top end side of a slope, and both end portions of the loosened portion and the inside connected portion are orderly released toward the direction of the bottom under water by tensional forces in such a way as to expand it to the direction of the bottom under water. CONSTITUTION:A sheet 1 is lapped on the top end 16 of a dam 13 and fixed by anchors 17. Objects 18 to be charged are dumped onto the bottom 19 under water to tense the end 20 on the bottom 19 side of the sheet 1 by the gravity and pressure of the objects to be thrown 18, whereupon the tensional force is transmitted to the loosened portion 2 of the sheet 1, the connector 8 of the connected portion A is broken, and the folded portion 6 is expanded to the direction of the bottom 19 under water. When the objects 18 are further deposited, the connectors 10 and 11 of the connected portions B and C of the sheet 1 are broken in sequence and the sheet 1 is expanded to the direction of the bottom 19 under water.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used to prevent the outflow of earth and sand by being installed from the top to the slope and water bottom of embankments constructed in ports, coasts, rivers, lakes, and other areas. This invention relates to a coating sheet for embankment bodies that prevents water and harmful substances from permeating.

(Prior art) - Conventionally, when a breakwater, II shore dike, detached shore dike, jetty, etc. were constructed, the earth and sand and stone blocks on the reclaimed side were affected by tidal currents.

To prevent it from being washed away by water currents and waves.

In addition, when an embankment is constructed as a partitioning force for an industrial waste treatment plant, it should be made impermeable and flexible so that sewage and particularly harmful substances in the waste do not permeate through the embankment and flow out. A covering sheet is laid from the top to the slope and the bottom of the water. In the embankment where the covering sheet has been laid in this way, when earth and sand or stone blocks are thrown in to expand the embankment width, when waste is thrown in, and when earth and sand for landfill is thrown in, these problems occur. Due to the pressure caused by the gravity and compression of the input material, the covering sheet, especially the slope part, was damaged due to stress concentration due to the force pulling the water toward the bottom.

The levee may split, and this damage causes the inconvenience that sewage and harmful substances permeate through the breakage and dirt from the levee body. For example, as shown in FIG. 14, the sheet material 1 has a plurality of loose parts 2αa, 2b, 2(
A tensile force is applied to the sheet material 1 by connecting the edges of both ends with connecting bodies 3 and increasing the number of connecting bodies 3 from the slack part 2C on the water bottom side to the slack part 2cL on the large end side. A covering sheet for embankment bodies has been proposed, which expands sequentially from the slack part 2C on the water bottom side when applied, and does not break or tear when soil and waste are thrown in (Special Publication No. 59-3084).
(See Publication No. 4).

(Problem to be solved by the invention) Covering sheets for embankments having such a configuration are widely used because they can prevent breakage and tearing when soil and waste are thrown in, but they are quite long. It is necessary to form multiple loose parts at appropriate intervals in the sheet material, which has a large thickness, which requires a huge amount of space and labor. However, if the deposited sediment is deposited sequentially from the bottom of the water, it will spread out from the loose parts closest to the bottom of the water to prevent breakage and splitting, but a large amount of sediment When water is poured all at once, especially on a slope, the loose parts that form near the bottom of the water do not expand and become buried in the earth and sand, making it impossible to fully demonstrate its function. The problem was that it couldn't be done.

The present invention was made in view of the actual borrowing number, and it does not require a large space, is easy to manufacture, and can function satisfactorily regardless of the input state of the input item. The purpose of the present invention is to provide a covering sheet for an embankment body that can exhibit high performance.

(Means for solving the problem) The present HA is a coating sheet for an embankment body made of a flexible sheet material and covering from the top of the embankment body to the slope surface and the water bottom. A slack section extending in the longitudinal direction of the embankment body is provided in a portion located near the top of the embankment, and the top and bottom edges of this slack section are connected, and the interior of the slack section is are connected to each other at multiple locations, and both end edges of the slack portion and the internal connecting portion are sequentially released by a tensile force toward the bottom of the water, thereby expanding the slack portion stepwise toward the bottom of the water. This is a means to solve the above problems.

(Example) Next, the present invention will be explained based on the drawings.

Figures 1 to 7 show one embodiment of the present invention. 8A water-impermeable and flexible material made of synthetic resin, asphalt-impregnated fabric, canvas, etc., with a thickness of about 0.5 to 5 cm. At a location where the sheet material 1 is laid near the top of the slope, a strip of slack portion 2 having three folded portions 4,5,6 inside is formed in the longitudinal direction of the embankment body. And edge portions 7α on the top side and bottom side of this slack portion 2.

A connecting member 8 in the shape of a flat plate made of the same material as the sheet material 1 and thinner than the sheet material 1 is attached between the sheets 7b by welding, adhesion, etc. Therefore, both ends 7α and 7b are connected to each other, In addition, the ends 4α and 5α on the top end side of the folded portion 4.5 formed inside, and these ends 4α and the slack portion 2
Connecting members 10 and 11, each having a substantially U-shaped side end surface, are attached between the inner surface 9α of the top plate 9 and the connecting members 10 and 11 by the same means as the connecting member 8. The connection force at the connection point between the ends 4α and 5α (connection portion B) and the connection point between the end portion 5a and the inner surface 9g (connection portion B) increases in the order of the connection portion, B, and C. do.

For this purpose, as shown in FIG.
If B and C increase in the order, as shown in Figure 3, the same number of connecting members 8.10.11 are added to B and C respectively.
and these connecting members 8. When increasing the width dimension of IO, 11 in the order of connecting member 8゜10, u,
Furthermore, as shown in FIG.
A conceivable case is that 0.11 is formed into a belt shape extending in the direction in which the slack portion 2 is formed, and a small hole is formed near the center in the transverse direction, and the number of small holes is decreased in the order of connecting members 8, 10, and 11. Note that the same effect can be obtained by forming a notch instead of the small hole 13 (not shown).

Furthermore, what is shown in Fig. 8 is one in which the connecting parts B and C are directly welded without using the connecting members &10 and u, and in this case as well, the welded area is ! Welding strength can be adjusted by changing the number of bonding points.

In other words, the structure is such that the connection strength increases in the order of connection parts A, B, and C.

This example is configured in this way! As shown in FIG. 11, by laying it along the slope 14 of the embankment body B, overlapping one edge 15 with the crown 16, and locking it to the anchor 17 embedded in the crown 16 of the embankment body 13. Fix it. and waste,
When the input material 18 consisting of reclaimed earth and sand is put into the water bottom 19, the input tin is deposited, and the end of the sheet material 1 on the water bottom 19 side is pulled due to its gravity and pressure, this tensile force is equal to Loose part 2 located near the top end 16 of the surface 14
transmitted to. At this time, in the present invention, the slack portion 2 is 3
It has two folded parts and a connecting part, B, C.
are respectively attached with connecting members 8, 10.11 having different connecting forces.
The connecting member 8 that connects the connecting portion between the edge 7a on the top 16 side and the edge 7b on the bottom 19 side is broken, and the folded portion 6 is expanded toward the bottom 19 (see Fig. 6 and the bottom). (see figure).

Next, when the input material 18 is further accumulated, the connecting portion B having a weak connection strength, that is, the connecting member 10 connecting the connecting portions with the ends 4α and 5α on the top 16 side of the folded portions 5 and 4, respectively, breaks. The folded portion 5 is expanded toward the water bottom 19 (see FIG. 7). When the input material 18 is further accumulated, the connecting portion C9, that is, the connecting portion between the end 4α of the folded portion 4 on the top end 16 side and the inner surface 9a of the top plate 9 of the loose portion 2 is broken, and the folded portion 4 is broken. It spreads to the bottom 19 side. Therefore, the connecting part is pulled by the pulling force towards the bottom of the water.

B and C are released in order, and the loosened part 2 is gradually moved to the bottom 1 of the water.
Because it expands in 9 directions, it effectively absorbs the tensile force that tends to concentrate on the shoulder part of the sheet 1.

This prevents the sheet material 1 from being damaged or torn.

In addition, in the example of using two pieces, the loose part 2 is connected to all folded parts 4 of the loose part 2 when the loading work of the input material 18 is completed.
．． 5.6 shows the case where all of the parts are expanded, but at the end of the work, the tensile force I exerted on the sheet material 1 due to gravity and pressure causes at least one connecting member to break, the connection is released, and the sheet material It is sufficient if the structure expands in the 19 direction of the water bottom. Further, the width and number of the folded portions 4.5.6 formed inside the slack portion 2 are appropriately determined depending on the embankment body on which the sheet material 1 is laid.

Further, FIGS. 9 and 10 show other embodiments of the present invention, which differ from the previous embodiments in that they do not have a folded part inside the slack part 2. . That is, in the embodiment shown in FIG. A plurality of connecting members 94 are oriented in the longitudinal direction of the slack portion 2, and are successively connected to each other by 21.22, and these connecting members &21.2
The connection strength of connection parts A, B, and C due to connection member 8
．． When a tensile force is applied to the sheet material 1 in the direction of the water bottom 19 by increasing it in the order of 21 and 22, these connecting members 8.
21 and 22 are sequentially broken outside the two layers, and the loosened portion 2 is gradually expanded toward the bottom of the water.The embodiment shown in FIG. 10 is different from the embodiment shown in FIG. Although the structure is almost the same as that of the embodiment shown in FIG.
and the inner surface 91#9J are directly welded and connected by these bath fitting parts Z3.24.25', B.

The connection strength with C is changed in order.

Note that the method of using these embodiments is the same as that of the above embodiments.

(Effects of the Invention) The present invention provides a coating sheet for an embankment body made of a flexible sheet material that covers the entire slope and water bottom f from the top of the embankment body, which is close to the top of the slope. A single slack section extending in the longitudinal direction of the embankment body is provided in the part where the point guard is located, and the top and bottom edges of this slack section are connected, and the interior of the slack section is connected at multiple points. They are connected to each other, and both end edges of the slack portion and the inner connection portion are sequentially released by a tensile force toward the bottom of the water, thereby expanding the slack portion stepwise toward the bottom of the water.
When the fuselage covering sheet according to the present invention is laid from the top of the embankment body to the slope and the water bottom, when waste or earth and sand are thrown in and the sheet material is pulled toward the water bottom, it concentrates on the slope shoulder. It goes without saying that the loose parts formed in the sheet material can be spread out in stages to effectively absorb and disperse the stress that easily occurs in the sheet material, preventing breakage and tearing of the sheet material. Since it is formed near the area, the loose part will surely expand regardless of the amount or method of input.

Not only is it easy to confirm, the manufacturing process requires less space and labor, and it also has various effects such as preventing loose parts from deforming or expanding during transportation and storage. It is something.

[Brief explanation of the drawing]

Figures 1 to 7 show one embodiment of the present invention.
The figure is a perspective partial view, FIGS. 2 to 4 are enlarged perspective partial views showing a connected state, FIGS. 5 to 7 are explanatory views showing a state in which the loose portion is expanded, and FIGS. The figure is a side view showing a slack portion in another embodiment of the present invention. Also. 11 and 12 are schematic side views of the embodiments shown in FIGS. 1 to 7, showing how they are used, and FIG. 14 is a partial perspective view of the conventional example. 1...Sheet material, 2...Loose part,
7α, 7b... Edge portion, 13...
Embankment body, 14...Slope surface. 16...Top, 19...Bottom, person,
B, C...Four connections.

Claims (1)

[Claims] In a covering sheet for an levee body made of a flexible sheet material and covering from the top of the levee body to the slope and the water bottom, a portion located near the top of the slope is coated in the longitudinal direction of the levee body. A single slack section is provided that extends to the bottom, and the top and bottom edges of the slack section are connected to each other, and the inside of the slack section is connected to each other at a plurality of points, and both ends of the slack section are connected to each other at multiple points. 1. A covering sheet for an embankment body, characterized in that the edge portions and the internal connecting portions are sequentially released by a tensile force toward the bottom of the water, and the loose portions are gradually expanded toward the bottom of the water.