JPH067047Y2 - Cover sheet for reclaimed seawall - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cover sheet for a reclaimed seawall that is laid on the slope of a backfill gravel when a reclaimed seawall is constructed on a shore or the like.

[Prior art]

Conventionally, when reclaiming a coast, etc., first a quay consisting of concrete blocks and caisson is constructed along the sea along the reclaimed area, and a reclaimed revetment is constructed by adding backfilling sand to the reclaimed area side of this quay. In this case, a waterproof covering sheet is laid on the slope of the backfill gravel for the purpose of preventing the collapse of the ground due to tidal current, waves, etc., or the loss of the backfill gravel. There is. Then, wave pressure and wind pressure from the sea side act over a wide area on the cover sheet for landfill revetment, and as a result, the cover sheet floats,
It was agitated or damaged, and the backfill gravel caused the collapse of the method, which was a serious problem especially when the operation of charging the landfill sand was stopped for a long time or was temporarily stopped.

So, for example, Japanese Utility Model Publication No. 60-40661 and Japanese Patent Application Laid-Open No. 61-17617.
As disclosed in the publication, a waterproof sheet having a water permeable and air permeable window formed at an appropriate position has been developed. According to this cover sheet for landfill revetment, seawater or air that has passed through the gap between the quay and the backfill gravel flows out through the transparent window to the landfill side, eliminating the level difference between the sea side and the landfill side, and forming the cover sheet. The cover sheet can be supported stably, and the cover sheet can be prevented from being damaged due to floating and flaking. Especially, in the one disclosed in Japanese Utility Model Publication No. 60-40661, since the closing plate is loosely provided to cover the transparent window, when the water level on the landfill side rises, the transparent window is closed by the closing plate and from the landfill side. It is possible to prevent collapse of the revetment due to the infiltration of water, and as the landfill progresses, the closing plate presses against the waterproof sheet by the landfill sand and seals the transparent window naturally, preventing the subsequent penetration of water and the outflow of landfill sand. It has the advantage that it can.

[Problems to be solved by the invention]

In the cover sheet for landfill revetment as disclosed in the above-mentioned Japanese Utility Model Publication No. 60-40661, considering the advantages in manufacturing and the strength of the entire cover sheet, the wave pressure and wind pressure from the sea side can be more efficiently applied to the landfill side. In order to release it, the through holes formed in the waterproof sheet may be enlarged.

However, if a large transparent window is formed, the water pressure from the sea side,
When wind pressure is applied, backfill gravel easily flows out and falls off a large amount from the transparent window, and the bank slope and the like collapse.

[Purpose of device]

The present invention has been made to solve such problems,
A large transparent window is formed on the waterproof sheet covering the revetment to easily release wave pressure, wind pressure, etc. from the sea side to the landfill side to prevent the covering sheet and revetment from collapsing more effectively. An object of the present invention is to provide a cover sheet for landfill revetment in which backfill gravel does not drop from the hole to the landfill side.

[Means for solving problems]

According to the present invention, a transparent window is formed at an appropriate position of a waterproof sheet, and a closing plate for closing the transparent window is loosely fixed to the waterproof sheet, and the transparent window is entirely covered. It is characterized by being equipped with a net body.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an embodiment of the present invention, in which a polyvinyl chloride tarpaulin 1 having a thickness of 2 to 10 mm, a width of 1 to 5 m, and a length of 2 to 20 m is square in place. A plurality of transparent windows 2 are formed, and a net body 3 made of a material having corrosion resistance such as polyvinyl chloride resin is formed on the entire surface of the transparent windows 2 by an adhesive on the surface 1a on the landfill side. Alternatively, it is equipped by being joined by heat bonding. The maximum width of the mesh of the net body 3 needs to be narrower than the minimum width of the backfill gravel used for the reclaimed seawall on which the cover sheet is laid. At least the cover sheet is laid on the reclaimed seawall. In this case, the back gravel is prevented from passing through the mesh. Further, the transparent window 1 of the waterproof sheet 1 has a size such that the surface 1a on the landfill side completely covers the transparent window 2.
A closing plate 4 made of the same material as the above is fixed.

That is, one end 4a of the closing plate 4 is fixed to the waterproof sheet 1 by an appropriate means such as welding or sewing, and the opposite end 4b is fixed.
A plurality of ropes 6 having a slack 5 are fixed to the waterproof sheet 1 by an appropriate means, and the one end 4b side is separated from the surface 1a on the landfill side by the amount of the slack 5 to open the transparent window 2. It is configured.

In order to use the cover sheet A for landfill revetment constructed in this way, as shown in FIG. 3, the landfill revetment 12 constructed by providing the backfill gravel layer 10 on the landfill side of the quay wall 11 made of concrete blocks, for example. In the above, the through window 2 may be located on the slope 7 so that the entire length of the slope 7 and the top surface 8 are covered in the same manner as in the conventional case. And
The seawater that has reached the backfill gravel layer 10 forming the slope 7 passes through the transparent window 2 and presses the closing plate 4, creating a gap corresponding to the slack 5 of the rope 6 and flowing into the landfill side B from this. The level difference with the sea side C is eliminated, and even if the air in the gap between the quay 11 and the backfill gravel layer 10 is compressed by wind pressure or waves from the sea side C, the closing plate 4 is pressed in the same manner as above. It is discharged to the landfill side B. For this reason, the waterproof sheet 1 does not float or warp, and the waterproof sheet 1 and the land revetment 12 are not damaged.

In particular, in the present invention, since the transparent window 2 is equipped with the mesh body 3 over the entire surface thereof, even if the transparent window 2 is formed large in order to make the circulation of seawater, compressed air, etc. extremely good, the back window 2 There is no risk of gravel protruding or falling off.

Therefore, even if the soil A is not laid for a long period of time with the sheet A for the reclaimed seawall laid, the waterproof sheet 1 will not float up and be agitated, and the waterproof sheet 1 and the reclaimed seawall 12 will not be damaged. I do not receive it.

Moreover, when the landfill progresses and the landfill sand reaches the position of the transparent window 2,
Due to the earth pressure, the peripheral edge of the closing plate 4 comes into close contact with the waterproof sheet 1 to cover the transparent window 2 and prevent water from entering the landfill side B and outflow of harmful substances from the transparent window 2.

As shown in FIG. 3, the transparent window 2 is provided below the center of the slope 7 which is always below the water surface and at a location above the water surface and near the top end surface 8, but the arrangement is arbitrary. .

In addition, in the present embodiment, the one end 4a of the closing plate 4 is fixed to the waterproof sheet 1, but it may be fixed with a rope having slack over the entire surface, and the closing plate 4 for closing the window 2 may be fixed. It suffices that the slack is fixed at least in part and that the slack is opened by seawater or compressed air from the sea side.

[Effect of device]

Since the cover sheet for landfill revetment according to the present invention has a structure in which a net is provided on the entire surface of the transparent window formed in the waterproof sheet 1, it is possible to prevent the backfill gravel from protruding and falling from the transparent window. Therefore, it is possible to make the through-hole larger in order to improve the passage of seawater or wind pressure from the sea side to the landfill side. It is possible to provide the one with less damage to the slant or the waterproof sheet and the revetment, and the structure is also large in size, and it is sufficient to equip the transparent window with a net to make a small transparent window and closing plate. Compared with the case of forming a large number, it is advantageous in manufacturing and does not significantly reduce the strength, and has various effects such as no hindrance to the laying work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective partial view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along line 1-1 thereof, and FIG. 3 is an explanatory view showing a use state. . 1 ... Waterproof sheet, 1a ... Surface, 2 ... Transparent window, 3 ...
Net, 4 ... Closing plate, 5 ... Slack, 6 ... Rope.

Claims (1)

[Scope of utility model registration request] 1. A waterproof sheet is formed with a transparent window at a proper position, and a closing plate for closing the transparent window is loosely fixed to the waterproof sheet, and the transparent window has an entire surface. A cover sheet for a reclaimed seawall, which is equipped with a net body.