JP2809262B2 - Civil engineering sheet for preventing earth and sand suction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a civil engineering sheet for preventing earth and sand from being sucked out when a seawall is formed using a rubble mound and a caisson and the water surface is reclaimed. It is suitable to be applied to a venue.

[0002]

2. Description of the Related Art As a recent waste disposal method, landfilling has been performed instead of conventional landfilling, and landfilling on the sea surface has also been performed.

In the case of performing land reclamation as a final treatment of such wastes, it is necessary to prevent wastes and harmful substances from the wastes from flowing into the open sea.

Therefore, a gravity type seawall construction method using a caisson, which can relatively easily form seawalls, has been adopted. According to this method, as shown in FIG. 9, a seawall is formed by rubble on the underwater ground of the seawall construction part to form a foundation a, and mounting a caisson b thereon. In this case, when the land and sand are directly charged and landfilled, the pressure difference between the inside and outside of the revetment due to tide fluctuations causes the land and sand after landfill to be sucked out into the gap between the rubble stones of the backing part c near the foundation a,
The ground may collapse on the ground. Furthermore,
The outflow and runoff of the earth and sand d from the opening of the joint between the caissons also occur. Therefore, in order to prevent such suction of earth and sand, it has been proposed to lay a civil engineering sheet e having water impermeability or water permeability but impermeable to earth and sand on the backing portion, and throwing earth and sand thereon. ing.

[0005]

Such a civil engineering sheet e is effective in preventing earth and sand d from being sucked out into the gap between the backing parts c. Due to the occurrence of a concentrated load in the non-land portion of the rubble and the collision of a projecting part such as a rock in the injected earth and sand, the earth and sand sheet e is damaged from both sides, and in extreme cases, the sheet may be broken.

When this type of sheet e is laid on the bottom of a water, when it is caught by a tidal current or a wave, a scouring phenomenon may occur between the back portion of the lower surface of the sheet and the soil dropped on the upper surface of the sheet and the upper surface of the sheet. However, there is a possibility that land subsidence may occur on the ground.

The present invention has been made in view of the problem of laying a civil engineering sheet on a gravity type revetment by the above-mentioned caisson. In addition, there is no danger of scouring on both the upper and lower surfaces of the sheet, and a new earth and sand suction prevention civil sheet capable of suppressing the sheet curling up due to tides and waves with the rigidity and weight of the wire mesh. Is what you do.

[0008]

According to the present invention, there is provided a civil engineering sheet for preventing earth and sand from being sucked out, which comprises an impermeable sheet or a water-impermeable sheet.
On both sides of a sheet that has water permeability but does not allow earth and sand to permeate
A wire mesh is attached by wire mesh fixing means, and the wire mesh is
The upper surface of the sheet and the dropped soil and the lower surface of the sheet and the backing portion
To form a water gap by wire mesh between
It is formed so as to have a sufficient height,
The means is fixed to the sheet for inserting a wire mesh fixing ring.
A ring insertion member having an opening,
And a ring for fixing the wire mesh.
By inserting the wire mesh, the wire mesh is attached to both sides of the sheet.
To be fixed.

[0009]

According to the present invention, since the wire mesh is attached to both sides of the water-impermeable or water-permeable sheet, the earth and sand sucking-preventing civil engineering sheet of the present invention is laid on the backing part, and then the landfill is removed. When the sheet is inserted, the wire mesh on both sides of the sheet exerts a cushioning effect on the rubble on the lower surface of the sheet and the earth and sand injected from above, thereby effectively preventing damage and breakage from both sides of the sheet.

Further, since the wire mesh on both sides of the sheet is attached, a water flow gap is formed by the wire mesh between the upper surface of the sheet and the dropped soil and between the lower surface of the sheet and the backing portion. Since it circulates through the sheet, scouring on the upper and lower surfaces of the sheet is prevented. In addition, it is also possible to adjust the load-bearing effect by changing the mesh size of the wire mesh between the back and front sides, and it is also possible to change the knitting direction and adjust the rigidity in the X-Y direction.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show one embodiment of the earth and sand wicking prevention civil engineering sheet of the present invention. FIG. 1 is a plan view and FIG.
FIG. 3 is a side sectional view, and FIG. 3 is a perspective view showing a spoke insertion member for fixing a wire mesh.

Civil sheet 1 for preventing earth and sand from being sucked out of this embodiment
A wire mesh 3 is stretched on both sides of the water-impermeable sheet 2, and the wire mesh 3 is fixed to the water-impermeable sheet 2 by wire mesh fixing means 4 including spokes (steel wires) 5 and spoke insertion members 6. It is.

The water-impermeable sheet 2 is selected from materials having appropriate flexibility, corrosion resistance, and strength, and is preferably a sheet made of rubber, vinyl chloride, or the like. The wire mesh 3 is a regular diamond wire mesh, and its height is impermeable sheet 2 to prevent scouring.
Is formed at a desired height so that a sufficient water gap is formed between the upper surface and the injected earth and sand and between the lower surface of the water-impermeable sheet 2 and the backing portion (approximately 20 mm to 30 mm). preferable).

In this embodiment, in order to fix the wire netting 3 to the water-impermeable sheet 2, as shown in FIG. 3, a strip made of the same material as the water-impermeable sheet 2 and having a recess 6a at the center is provided. A spoke insertion member 6 formed of a shaped sheet is previously bonded or fused to both surfaces of the water-impermeable sheet 2 at appropriate intervals, and after the wire mesh 3 is placed on the water-impermeable sheet 2, the spokes 5 are connected to the wire mesh. Spoke insertion material 6 while passing through
Through the recess 6a. In this way, the wire mesh 3 is attached to both sides of the water-impermeable sheet 2 by arranging a plurality of spokes 5 on each side of the water-impermeable sheet 2 in parallel at predetermined intervals. The soil sheet 1 for preventing earth and sand suction thus completed can be wound in a roll shape by winding the sheet in a direction orthogonal to the longitudinal direction of the spokes 5 and is convenient for transportation. In addition, the spoke insertion material 6
It is preferable to use the same material as the sheet 2, but another material may be used as long as the material can be bonded or fused to the sheet 2.

FIGS. 4 to 6 show another embodiment of the earth and sand suction preventing civil engineering sheet of the present invention. FIG. 4 is a plan view and FIG.
Is a side sectional view, and FIG. 6 is a perspective view showing a wire mesh fixing means. In this embodiment and the embodiments described later, the same components as those in the embodiment of FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description is omitted.

In this embodiment, a wire mesh 3 is fixed to the water-impermeable sheet 2 on both sides of the water-impermeable sheet 2 by means of a wire mesh fixing means 4 comprising a wire mesh fixing ring 7 and a ring insert 8. It is made.

In this embodiment, in order to fix the wire mesh 3 to the water-impermeable sheet, as shown in FIG. 6, a ring insertion member 8 made of a square sheet made of the same material as the water-impermeable sheet 2 is used. A wire mesh fixing ring 7 is inserted through and fixed to the water-impermeable sheet 2 at appropriate intervals on both sides in advance. The wire mesh fixing ring 7 has both ends 7a, 7a open.
A wire mesh can be passed through a gap 7b (FIG. 6) between both ends 7a, 7a. Then, the wire mesh 3 is placed on the water-impermeable sheet 2 so as to be inserted into the ring 7 through the gap 7b, and then both ends 7a, 7
The wire mesh 3 is fixed on the water-impermeable sheet 2 by closing a.

FIGS. 7 and 8 show another embodiment of the earth and sand suction preventing civil engineering sheet according to the present invention. FIG. 7 is a plan view.
FIG. 8 is a side sectional view.

Civil sheet 1 for preventing earth and sand from being sucked out of this embodiment
The wire mesh 3 is stretched on both sides of a sheet 9 which has water permeability but does not allow earth and sand to pass therethrough, and the wire mesh 3 is fixed to the sheet 9 with a wire mesh fixing ring 10.

As the sheet 9 having water permeability but impervious to earth and sand, synthetic resin fibers made of nylon, polyethylene, polypropylene or polyester having flexibility, corrosion resistance and sufficient strength are suitable. Name) can be used. Further, a non-fiber sheet such as a vinyl chloride resin formed with a large number of small holes (about φ2) that does not allow earth and sand to pass through may be used.

In this embodiment, the wire mesh 3 is
After the wire mesh fixing ring 10 is stretched on both sides, the wire mesh fixing ring 10 is inserted into the fiber eyes or small holes of the sheet 9 so as to wrap the wire mesh 3 with both ends 10a, 10a (FIG. 8) opened. , 10 a are closed to fix the wire mesh 3 to the water-permeable sheet 9.

In this embodiment, by using the water-permeable sheet 9, when the sheet 1 is laid, the sheet is spread, and when the sheet is settled from the surface of the water to the bottom of the water, the settlement speed is high and the workability is good. Flows freely through the water-permeable gap formed by the wire mesh on both sides of the sheet and the water-permeable sheet 9, so that the scouring prevention effect on the upper and lower surfaces of the sheet is further improved.

Note that the wire mesh fixing means for attaching the wire mesh to the sheet is not limited to those shown in the above-described embodiments, and other fixing means may be used.

[0024]

As described above, according to the present invention,
Since the wire mesh is attached to both sides of the water-impermeable or water-permeable sheet, the earth mesh for both sides of the sheet can be obtained by laying the earth and sand suction preventing civil engineering sheet of the present invention on the backing portion and then putting in the earth and sand for landfill. Has a cushioning effect on the rubble on the lower surface of the seat and on the earth and sand poured from above, thereby effectively preventing damage and breakage from both sides of the seat.

Further, since the wire mesh on both sides of the sheet is attached, water flow gaps are formed by the wire mesh between the upper surface of the sheet and the dropped soil and between the lower surface of the sheet and the backing portion, respectively. Since it circulates through the sheet, scouring on the upper and lower surfaces of the sheet is prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a civil engineering sheet for preventing earth and sand suction of the present invention.

FIG. 2 is a side sectional view of the embodiment.

FIG. 3 is a perspective view showing a wire mesh fixing spoke insertion material used in the embodiment.

FIG. 4 is a plan view showing another embodiment of the earth and sand suction preventing civil engineering sheet of the present invention.

FIG. 5 is a side sectional view of the embodiment.

FIG. 6 is a perspective view showing a wire mesh fixing means of the embodiment.

FIG. 7 is a plan view showing another embodiment of the earth and sand suction preventing civil engineering sheet of the present invention.

FIG. 8 is a side sectional view of the embodiment.

FIG. 9 is a side view showing a conventional laying sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Civil engineering sheet for earth and sand suction prevention 2 Water impervious sheet 3 Wire mesh 5 Spoke 6 Spoke insertion material 7, 10 Wire mesh fixing ring 9 Sheet which has water permeability but does not permeate earth and sand

Claims (1)

(57) [Claims] 1. A wire mesh is attached to both sides of a water-impermeable sheet or a sheet having water permeability but impermeable to earth and sand by means of wire mesh fixing means. The wire mesh fixing means is fixed to the sheet and has an opening through which a wire mesh fixing ring is inserted. A ring inserting member having a portion, and a wire mesh fixing ring inserted through the opening, wherein the wire mesh is fixed to both surfaces of the sheet by inserting the wire mesh into the wire mesh fixing ring. Cigarette sheet for preventing earth and sand suction.