JPH0617852Y2 - Tarpaulin for civil engineering - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to a tarpaulin for civil engineering work used in revetment construction and the like.

<< Prior Art >> This type of waterproof sheet is used, for example, as a backfill material for articulated blocks and rock-fill layers in revetment work, and is applied to slopes b formed on banks such as rivers as shown in Fig. 4. By laying and sequentially laying the blocks c on the waterproof sheet a, water that intrudes from the block joints is blocked, and the earth and sand are prevented from flowing out through the gaps of the block joints or being washed. It is a thing.

As shown in FIG. 5, the waterproof sheet a has a structure in which a water-impervious vinyl chloride sheet d and a felt e for protecting the vinyl chloride sheet d are integrated in a laminated form with an adhesive f, but other waterproofing As a sheet structure, as illustrated in Japanese Utility Model Laid-Open No. 59-76618, there is also a three-layer structure in which a buffer layer is integrated above and below a water-impervious layer via an adhesive.

<< Problems to be Solved by the Invention >> However, in the conventional waterproof sheet, the water-blocking layer and the buffer layer, which are made to have a predetermined length, are pasted with an adhesive agent regardless of whether it has a two-layer structure or a three-layer structure. Since it was matched, the workability of sticking is poor, and when mechanizing this, the waterproof sheet is a long product so the equipment cost is not ridiculous, and uneven application of the adhesive f occurs, There is also a risk that the stability of the agent after use will be impaired due to deterioration of the agent.

Further, although the waterproof sheet is provided in a state of being cut into a predetermined length and rolled up in a tubular shape, it is heavy and requires a great deal of force when being transported or laid at a construction site.

In view of the above problems, the present invention provides a waterproof sheet for civil engineering work which has a simple structure and can eliminate the bonding work with an adhesive and can reduce the labor force during transportation or installation. Especially.

<< Means for Solving Problems >> In order to achieve the above object, the present invention provides a waterproof sheet which is laid on a slope and on which a heavy object such as a block is installed, wherein the waterproof sheet has A synthetic resin water-impervious layer having a plurality of needle-shaped protrusions and a buffer layer such as felt disposed on the water-impervious layer. The water-impervious layer and the buffer layer are laid on the slope. The gist is that a buffer layer is superposed on the water layer, and by accommodating the load of the heavy weight, the needle-like protrusions piercing the buffer layer are locked and integrated.

<< Operation >> According to the above configuration, first, the impermeable layer is laid on the slope, then the buffer layer is arranged on the impermeable layer while being overlapped, and then the block or the like is installed thereon. Then, the impermeable layer and the buffer layer are integrated by the protrusion of the impermeable layer piercing the buffer layer. In other words, since the buffer layer is made of a relatively soft material such as felt, the protrusions pierce the buffer layer just by stacking it on the water-impervious layer, and the pierced state is maintained by receiving the load of heavy objects such as blocks. It becomes a perfect one-piece.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a main part of a waterproof sheet for civil engineering work to which the present invention is applied, and FIG. 2 is a sectional view showing a usage state of the sheet.

In the figure, a waterproof sheet 1 as a civil engineering material is composed of a water blocking layer 2 such as a vinyl chloride sheet and a buffer layer 3 such as felt provided on the water blocking layer 2, and the surface of the water blocking layer 2 is covered by the buffer layer 3. By covering it, the water-impervious layer 2 is protected and the block 4 can be stably installed.

As a specific material of the water-blocking layer 2, for example, a synthetic polymer sheet of polyethylene, butyl rubber, neoprene, vinyl acetate and polyethylene copolymer, etc. can be used in addition to the vinyl chloride sheet.

A plurality of projections 5 are integrally formed on the surface of the water shield layer 2 at appropriate intervals. The protrusion 5 has a needle-like shape with a thin tip. Further, the protrusion 5 is set to have a length substantially equal to the thickness of the felt 3, and is formed in a state of being inclined at a predetermined angle in a certain direction.

On the back surface of the water-impervious layer 2, a plurality of non-slip recesses 2a formed by using a sheet roll or the like at the time of forming the sheet are provided in a lattice shape, and are formed in a concavo-convex shape as a whole.

Further, as the buffer layer 3, it is possible to use a felt made of a scrap for civil engineering, a fluff fiber product, a virgin short fiber product, or the like.

In the above structure, as shown in FIG.
Is laid so that the projections 5 face upward with respect to the slope 7, and then the buffer layer 3 is laid on the impermeable layer 2.

Here, when the water-impervious layer 2 is laid on the slope 7 having a relatively steep slope as shown in the figure, since the soil of the slope 7 bites into the recess 2a, the friction resistance against the slope 7 is large. And slip is effectively prevented.

Further, in the buffer layer 3 stacked on the water-impervious layer 2, the tips of the protrusions 5 pierce the back surface of the buffer layer 3 as shown in FIG. 3 (a). In this state, if the articulated blocks 4 are regularly installed, the buffer layer 3 is brought into close contact with the water-impervious layer 2 due to the weight of the block 4 shown in FIG. Thus, the two layers 2 and 3 are joined and integrated through the protrusion 5 to form the waterproof sheet 1.

Therefore, according to this configuration, since the waterproof sheet 1 can eliminate the step of attaching the water-impervious layer 2 and the buffer layer 3 with an adhesive, not only the manufacturing cost can be greatly reduced, but also handling such as transportation is possible. It will be easy.

Because of this, conventionally, the work of laying a waterproof sheet, etc. requires a force, and therefore, it has been performed exclusively by men. However, in the waterproof sheet 1 of the present invention, since the water-impervious layer 2 and the buffer layer 3 can be laid separately, the weight restriction is relieved and it is possible for not only men but also women to handle them.

Since the plurality of protrusions 5 are inserted into the buffer layer 3, the buffering property is somewhat lowered, but the durability is also improved.

In the above process, the shape and arrangement of the projections 5 of the water-impervious layer 2 are not limited to this embodiment, and both layers are pierced by the buffer layer 3 with the block 4 installed and the projections 5 are interposed therebetween. It is only necessary to integrate them.

<< Effect of Device >> As described above, the waterproof sheet for civil engineering work according to the present invention has the following effects.

Since the impermeable layer and the buffer layer are integrated by piercing the needle-like protrusions formed on the impermeable layer, it is possible to eliminate the conventional bonding work using an adhesive and simplify the equipment and Cost reduction can be achieved.

In this case, the buffer layer is made of felt, etc., and is relatively soft, and the protrusions of the water-impervious layer easily pierce it. Durability can also be improved by the protrusions that are locked in and pierced.

Moreover, since the impermeable layer and the buffer layer are separately transported, the transaction process and the transportation work to the construction site are facilitated, and even when laid on the slope, it can be performed without requiring a large force.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part of a waterproof sheet for civil engineering work shown as a first embodiment of the present invention, FIG. 2 is a sectional view showing a state of use of the sheet, and FIGS. 3 (a) and 3 (b) are Sectional drawing which shows the joining effect | action of the water blocking layer and the buffer layer in the same sheet, FIG. 4 is a schematic sectional drawing which shows the use condition of the conventional waterproof sheet for civil engineering works, and FIG. 5 is sectional drawing which shows the structure of the sheet. Is. 1 ... waterproof sheet 2 ... impermeable layer 3 ... buffer layer 4 ... block 5 ... needle-shaped projections

Claims (1)

[Scope of utility model registration request] 1. A waterproof sheet which is laid on a slope and on which a heavy object such as a block is placed, wherein the waterproof sheet is a synthetic resin water-impervious layer having a plurality of needle-like protrusions formed on the surface thereof. And a buffer layer such as felt arranged on the impermeable layer, wherein the impermeable layer and the buffer layer are stacked on the impermeable layer laid on the slope, and the load of the heavy object A waterproof sheet for civil engineering works, characterized in that the needle-like projections piercing the buffer layer are locked and integrated by being received.