JPH0617851Y2 - Waterproof sheet for civil engineering work - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to a waterproof sheet for civil engineering work that is laid on a slope when building a residential land or constructing a revetment.

<< Prior Art >> A waterproof sheet as a civil engineering material is cheaper than a natural material and has a superior water blocking effect, and is easy to control the thickness.
Its scope of application is expanding more and more because it has advantages such as simplification of implementation.For example, in revetment work, earth and sand flow out through gaps between articulated blocks and rockfill layers, and scouring. It is used to prevent grounding and stabilize the ground. As the sheet material, in addition to water blocking property, flexibility and durability capable of sufficiently withstanding a slight uneven settlement are required. For example, in the case of a slope, vinyl chloride, polyethylene sheet and the like are suitable.

FIG. 3 shows an example of using the waterproof sheet, and FIG. 4 schematically shows the structure of the waterproof sheet. In these figures, the waterproof sheet a is used as a backfill material for the joint block c laid on the slope b and is covered with the sheet a on the slope b formed by cutting or embankment. By sequentially stacking the blocks c with each other, the block load is dispersed and stably held, and the water entering from the block joints is completely blocked. Further, the waterproof sheet a has a structure in which vinyl chloride d, felt e, and cloth material f are laminated, and by covering the lower water-blocking vinyl chloride d with buffer felt e and cloth material f, a block c or the like is formed. The vinyl chloride d is prevented from being damaged and the block c and the like can be stably installed. The cloth material f is provided to protect the felt e by preventing the felt e from fraying.

<Problems to be solved by the invention> By the way, in such a waterproof sheet, various kinds of improved quality such as durability are provided in accordance with the soil quality of the applied ground. Since the back surface has a flat shape or a simple convex shape, there is a problem that the sheet slips easily when covering the slope.
This is particularly noticeable when applied to a relatively long and steep slope, and not only is the scaffolding bad and the sheet slips, so not only the covering work takes time, but also the slope In many cases, it had to be dealt with by providing a lateral sliding groove.

The present invention has been made in view of the above background, and it is possible to efficiently perform the covering work by sufficiently biting the slope, and to provide a relatively long and steep slope. Another object is to provide a waterproof sheet that does not need to be provided with a slip-prevention groove.

<< Means for Solving Problems >> The waterproof sheet of the present invention is a waterproof sheet laid on a slope in order to achieve the above-mentioned object, and a lattice-like protrusion is integrally formed on the back surface of the sheet. It was formed to be an anti-slip concavo-convex.

<Operation> According to the above configuration, since the back surface of the waterproof sheet is formed in a concavo-convex shape by integrally forming the lattice-like protrusions, the lattice-like protrusions bite properly against the slope. In addition, the concave portion surrounded by the projecting portion has a rectangular shape, and the sand and sand enter the concave portion to be confined therein, which effectively acts as a slip stopper for the sheet.

<Example> Hereinafter, an example of a waterproof sheet for civil engineering work according to the present invention will be described with reference to the drawings.

FIG. 1 is a rear side perspective view of a civil engineering waterproof sheet according to an embodiment of the present invention. In the figure, the waterproof sheet 1 is
It has a structure in which a felt 3 and a cloth material 4 such as polypropylene are laminated on vinyl chloride 2, and as the vinyl chloride 2, one molded to a thickness of about 0.5 to 1.5 mm is used. The felt 3 and the cloth material 4 are bonded on the vinyl by an appropriate method such as heat welding or an adhesive.

In addition, instead of vinyl chloride as the material of the water-blocking sheet,
A synthetic polymer sheet such as polyethylene, butyl rubber, neoprene, vinyl oxide and polyethylene copolymer may be used, and a specific sheet structure may be, for example, a polyethylene sheet alone.

Then, the back surface of the waterproof sheet 1, that is, vinyl chloride 2
The lower surface of the is integrally formed with a lattice-shaped protruding portion 2a using a sheet roll or the like when forming the sheet. As a result, when the back surface of the waterproof sheet 1 is viewed, the entire back surface shape is uneven. Therefore, the projecting portion 2a bites against the slope, and the recessed portion 2b surrounded by the projecting portion 2a has a rectangular shape. The sand and sand are trapped in the recessed portion 2b to be trapped, and the waterproof sheet 1 does not slip. It is blocked enough. Although the lattice-shaped protrusion 2a is integrally formed by using a sheet roll or the like at the time of forming the sheet, a separate lattice-shaped protrusion may be provided by adhesion or welding in a later step.

FIG. 2 shows a state in which the waterproof sheet 1 is laid on the slope, and the operation of the waterproof sheet 1 will be described below with reference to FIG.

The figure shows a relatively long and steep slope, which makes it slippery when a conventional waterproof sheet is used. However, in the waterproof sheet 1 of the present invention, when the slopes 5 are sequentially covered, the sheet 1 placed on the slopes 5 is softly pressed from above, so that the lattice-shaped protrusions are formed as shown in FIG. 2a functions as a biting anchor inside the slope 5, and as a result, earth and sand enter and are confined in the recess 2b surrounded by the protrusion 2a, and there is no chance of slipping on the slope 5 for stable work. Can be done. Further, in the state where the slope 5 is covered, the flexibility or cushioning property of the waterproof sheet 1 is affected by the protrusion 2
Since it is improved by a, for example, when a block or the like is installed on the sheet, the block is installed more stably, and the sheet is caused by protrusions such as stones on the slope 5 that have not been removed. It also effectively acts as a tear prevention against the breakage of.

<Effect of the invention> As described above, the tarpaulin for civil engineering work according to the present invention is
The lattice-like protrusions on the back surface of the waterproof sheet function as an anchor that bites moderately against the slope to which it is applied, and as a result, the recess surrounded by the protrusion becomes a rectangular shape, and the sand and sand enter this recess. It conforms to the slope and can effectively prevent relative slip on the slope.

Therefore, with this anchor function, even if the root foundation of the block is washed in the event of a disaster, the grid-like protrusions bite into the slope to prevent accidents where the root is scooped. be able to. The number of anti-slip grooves can be improved even if the slope is steep with a bad footing and the covering work can be performed efficiently. Can be reduced or the groove itself can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a waterproof sheet for civil engineering work shown as an embodiment of the present invention as seen from the back side, FIG. 2 is a schematic view showing the action of the sheet, and FIG. 3 is a waterproof sheet for civil engineering work as a conventional example. FIG. 4 is a schematic view showing an example of use of the sheet, and FIG. 4 is a sectional view showing the structure of the waterproof sheet. DESCRIPTION OF SYMBOLS 1 ... Waterproof sheet, 2 ... Vinyl chloride, 2a ... Lattice-shaped protrusion, 2b ... Recess, 5 ... Slope.

Claims (1)

[Scope of utility model registration request] 1. A waterproof sheet laid on a slope, comprising:
A waterproof sheet for civil engineering work, characterized in that a lattice-like protrusion is integrally formed on the back surface of the sheet to form a non-slip irregularity.