JPH0542113Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a covering sheet for a reclaimed seawall that is laid on a slope made of a gravel layer or the like when constructing a reclaimed seawall on a coast or the like.

[Conventional technology] Conventionally, when reclaiming a coast, etc., a revetment wall made of concrete blocks or caissons was first constructed on the sea along the reclaimed area, and earth and sand for backfilling was placed on the reclaimed area side of the revetment wall. A method is used to construct a reclaimed seawall by adding a covering sheet to the backfilling gravel layer, etc., in order to prevent the ground from collapsing due to currents, waves, etc., or from washing away the backfilling gravel layer. It is being installed on slopes consisting of

In addition, wave pressure and wind pressure from the sea side acts on the reclaimed seawall covering sheet over a wide range through gaps in the seawall and backfilling gravel layer, and as a result, the covering sheet floats up. In order to prevent the gravel layer from being agitated or damaged, and furthermore, from collapsing,
For example, as disclosed in Japanese Utility Model Publication No. 60-40661, transparent windows for draining water and air are formed at appropriate locations on the sheet body, and a closing plate for closing the transparent window is provided with a slack in the sheet body. A device attached to the is being developed.

This covering sheet for reclaimed seawalls allows seawater or air that has passed through the gaps between the seawall and backfilling gravel layer to pass through transparent windows and be released to the reclaimed side, eliminating the water level difference between the sea side and the reclaimed side. This is intended to stably support the sheet on the seawall and to prevent damage to the covering sheet itself or the seawall due to stirring of the covering sheet. In particular, if the water level on the landfill side rises because a closing plate is provided with a slack to cover the transparent window, the transparent window can be closed with the closing plate to prevent bank protection from intruding water from the landfill side. In addition, as the landfill progresses, the landfill soil will press the closing plate to the waterproof sheet and close the transparent window naturally, thereby preventing future water penetration and washout of the reclaimed soil. It is ivy.

[Problem to be solved by the invention] However, in the case of the conventional covering sheet for a reclaimed seawall, in order to eliminate the water level difference between the sea side and the reclaimed side, seawater passes through the transparent window and is discharged to the reclaimed side. When wet, fine soil contained in seawater etc. gets between the covering sheet and the closing plate, and if the soil has a high and moderate moisture content, it exhibits viscosity and sticks the two together. It will be necessary to do so. Therefore, when waves hit the sea side, the seawater does not penetrate smoothly to the landfill side, and large water pressure acts on the entire cover sheet.As a result, the cover sheet is greatly agitated and the backfill gravel layer collapses. There is a problem in that the cover sheet may be damaged and may not be effective, especially when the surrounding area of the reclaimed revetment is located in geological formations that produce strong viscosity. prone to problems.

In addition, although the closing plate can release seawater or air that has passed through the gap between the seawall and backfill gravel layer from the sea side to the landfill side, it cannot conversely allow seawater from the landfill side to flow out to the sea side. As a result, there were problems such as the water level on the reclaimed side rising unilaterally and excessive force acting on the reclaimed embankment.

The present invention has been developed to solve this problem, and is designed to allow sediment contained in seawater to enter between the covering sheet and the closing plate, creating a gap that allows seawater and air to escape even if the two are in close contact with each other. Therefore, even if waves hit the sea side, the backfill gravel layer will not collapse or the covering sheet will be damaged, and even if the water level on the reclaimed side rises, the reclaimed seawall will not collapse. The purpose of the present invention is to provide a covering sheet for reclaimed seawalls that does not cause any damage.

[Means for Solving the Problems] The present invention is characterized in that a transparent window for draining water and air is formed at an appropriate location of the sheet body, and a closing plate for closing the transparent window has slack, so that the sheet body can be closed. A covering sheet for a reclaimed seawall attached to the surface is provided with a plurality of protrusions protruding from at least one of the surfaces of the sheet bodies facing each other or the back surface of the closing plate, and between the sheet body and the closing plate. A means for solving the above problem is that a gap is formed to communicate the transparent window with the outside.

[Operation] Seawater or air that has passed through the gaps between the seawall and the backfill gravel layer passes through the transparent window formed in the sheet body and is discharged to the landfill side. When the closing plate adheres to the covering sheet due to the viscosity of the earth and sand, multiple gaps are formed between the closing plate and the sheet body due to the plurality of convex portions, and seawater or air passes through these gaps through the transparent window. The waste is then discharged to the landfill.

[Example] Next, embodiments of the present invention will be described based on the drawings.

The drawing shows one embodiment of the present invention, and the reclaimed seawall covering sheet A has a thickness of 2 to 10 mm, a width of 1 to 7 m,
A waterproof sheet body 1 made of polyvinyl chloride and having a length of about 2 to 20 m has a diameter of 20 to 30 cm at an appropriate place.
A plurality of through holes 2 are formed. Further, a closing plate 3 formed of the same material as the sheet body 1 and having a rectangular shape large enough to close the transparent window 2 is fixed at the upper edge by heat welding or an appropriate means such as adhesive, and at the same time the lower edge is fixed. It is attached to the surface 1a of the sheet body 1 so as to be openable and closable by being attached with a plurality of ropes 4 having slack portions. Furthermore, sheet body 1
A closing plate 3 located below the transparent window 2 is located on the surface 1a of the window 2.
A plurality of columnar convex portions 5 made of the same material as the sheet body 1 are arranged side by side in the left-right direction at appropriate intervals on a portion facing the back surface 3 a of the sheet body 1 . By being stacked on top of each other, a gap 11 is formed between the sheet body 1 and the closing plate 3, which communicates the transparent window 2 with the outside.

Covering sheet A for reclaimed seawall constructed in this way
is used in the same way as the conventional one, and the second
As shown in the figure, for example, the entire surface of the backfilling gravel layer 7 extends between the slope 9 and the top surface 10 of the reclaimed revetment 8, which is constructed by providing the backfilling gravel layer 7 on the reclaimed side of the revetment wall 6 made of concrete blocks. It should be laid so as to cover it.

When the reclaimed seawall covering sheet A of this embodiment is laid, seawater or air that reaches the backfilling gravel layer 5 from the sea side B lifts up the closing plate 3 due to the water pressure or wind pressure and passes through the transparent window 2. The seawater on the landfill side C is smoothly discharged to the landfill side C, and on the other hand, the seawater on the landfill side C is passed through the transparent window 2 through the gap 11.
The water flows backward through the water, eliminating the water level difference between the sea side B and the reclaimed side C, and the reclaimed seawall covering sheet A covers the reclaimed seawall 8 in a stable state without being stirred up. Furthermore, even if the air present in the voids of the seawall 6 and backfill gravel layer 7 is momentarily compressed from the sea side B by wave pressure or wind pressure, it will be released from the transparent window 2 to the reclaimed side C in the same way as described above. Therefore, the covering sheet A for the reclaimed revetment does not float and cause upheaval, and damage to the covering sheet A for the reclaimed revetment and the reclaimed revetment 8 can be prevented.

Even if seawater or air passes through the transparent window 2, the earth and sand contained in the seawater may be removed from the sheet body 1.
Even if the dirt and sand get stuck between the sheet body 1 and the closing plate 3 and become stuck together due to the adhesive force of the sand and the closing plate 3, making it impossible to open them, as shown in FIG. A plurality of gaps 1 are formed by the convex portion 5 of
1 is formed, the revetment wall 6 and backfill gravel layer 7
The air or seawater that has passed through the gap passes through the transparent window 2 and the gap 11 and is discharged to the landfill side C, and as a result, the covering sheet A for a landfill seawall is not stirred. And damage to the reclaimed seawall 8 can be prevented.

Furthermore, even if the water level on the reclaimed side C rises, the seawater on the reclaimed side C will easily pass through the gap 11 and reach the sea side B.
, and the water level difference between the sea side B and the reclaimed side C is eliminated again, and there is no risk that an excessive force will be applied to the reclaimed seawall 8 and cause it to collapse due to a unilateral rise in the water level on the reclaimed side.

Furthermore, as shown in FIG. 3, when the landfill soil 12 is thrown into the landfill side C, the closing plate 3 comes into close contact with the surface 1a of the sheet body 1 due to the earth pressure, and the transparent window 2 is closed, and the landfill The gap 11 shown in FIG. 1 is closed by the earth and sand 12. Therefore, intrusion of seawater into the landfill side C and outflow of harmful substances from the landfill side C can be effectively prevented.

In this embodiment, the convex portion 5 is located on the surface 1 of the sheet body 1.
a, but the back surface 3a of the closing plate 3
Alternatively, they may be provided protruding from both sides, and although the transparent window 2 is provided in parallel below the transparent window 2, the surface 1 of the sheet body 1
Any location may be used as long as it is a position where a and the back surface 3a of the closing plate 3 face each other and a gap 11 is formed between the sheet body 1 and the closing plate 3 by the protrusion 5, which communicates with the transparent window 2 and the outside. . Furthermore, although the convex portion 5 is columnar, it may have another shape such as a round planar shape or a triangular shape.

[Effects of the invention] The covering sheet for reclaimed seawalls of the present invention eliminates the water level difference between the sea side and the reclaimed side due to ebb and flow of the tide, covers the reclaimed seawall stably, and also protects against large wave pressure from the sea side or Even if the air existing in the voids of the revetment wall and the backfill gravel layer is momentarily compressed by wind pressure, it will not float to the surface and cause agitation, thereby preventing damage to the reclaimed revetment covering sheet itself and the reclaimed revetment. can. Furthermore, even if the sheet body and the closing plate become stuck to each other due to the adhesive force of the wet earth and sand that has entered between them, and the closing plate cannot be opened, the air and seawater from the sea side will be blocked by the projections. Because the air passes through the gaps in the seawall, even if the air present in the gaps in the seawall and backfill gravel layer is momentarily compressed by large wave pressure or wind pressure from the sea side, it will not cause any turbulence, making it suitable for reclaimed seawalls. Damage to the covering sheet and reclaimed seawall can be prevented. Alternatively, even if the water level on the reclaimed side rises, the seawater on the reclaimed side will easily flow out to the sea side through the transparent window through the gap, and the water level difference between the sea side and the reclaimed side will be eliminated again.
This eliminates concerns about the collapse of the reclaimed embankment due to a unilateral rise in the water level on the reclaimed side. Furthermore, after the landfill, the closing plate comes into close contact with the surface of the sheet body due to the reclaimed soil and the transparent window is blocked, and the gap formed between the sheet body and the closing plate is closed by the reclaimed soil. Intrusion of seawater into the landfill side and outflow of harmful substances from the landfill side can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention, and FIGS. 2 and 3 are explanatory views showing the state of use. 1...Sheet body, 1a...Surface, 2...Transparent window,
3... Closing plate, 3a... Surface, 5... Protrusion, 11
……gap.

Claims (1)

[Scope of utility model registration request] A sheet body 1 is formed with a transparent window 2 for draining water and air at an appropriate position, and a closing plate 3 for closing the transparent window 2 is attached to the surface of the sheet body 1 with slack. In the covering sheet, surfaces 1a of the sheet body 1 facing each other
Alternatively, a plurality of protrusions 5 are protruded from at least one of the back surfaces 3a of the closing plate 3, and a gap 11 is formed between the sheet body 1 and the closing plate 3, communicating the transparent window 2 with the outside. A covering sheet for reclaimed seawall, characterized by: