JPH0349875Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a waterproof sheet useful for use as a waterproof sheet for concrete spraying or as a waterproof sheet for construction.

[Conventional technology]

It is common practice to attach a waterproof sheet to the surface of the primary track of a tunnel constructed using the NATM construction method, and then construct the secondary track using shotcrete, etc., or to pour concrete using formwork. It is being said.

[Problem that the invention attempts to solve]

Conventional waterproof sheets were made of rubber, synthetic rubber, or synthetic resin, and were only smooth and waterproof. When concrete is sprayed onto the tarpaulin, the pressure abrades it and creates holes, which not only impairs waterproof properties, but also causes problems such as the concrete not adhering well to the tarpaulin sheet.

[Means for solving problems]

This invention was made with the aim of solving the problems of conventional waterproof sheets as mentioned above.
The structure is such that a mesh-shaped, loop-shaped, mushroom-shaped, or T-shaped projection or protrusion is provided on one side of the waterproof sheet, and a nonwoven fabric or a protrusion is provided on the other side of the waterproof sheet. It is characterized by the formation of a water-permeable layer.

[Effect]

That is, the waterproof sheet of the present invention is attached to the surface of the primary footing of a tunnel constructed using the NATM construction method, with the surface with the protrusions facing the inside of the tunnel and the surface with the water permeable layer facing the front surface. However, when concrete is sprayed, a part or most of the concrete does not directly hit the waterproof sheet, but hits the projections and then attaches to the sheet, so that the impact caused by the spraying is alleviated and the projections The water-permeable layer of the waterproof sheet allows water seeping from the surface of the primary footing of the tunnel to be discharged to the bottom of the tunnel, thereby improving water-stopping properties. It is.

〔Example〕

Next, a waterproof sheet provided with protrusions or protrusions on one side will be explained with reference to FIGS. 1 to 4.

The one shown in Fig. 1 is a waterproof sheet 1 made of rubber, synthetic rubber, synthetic resin, etc., with a synthetic resin net 2 pasted on one side of the sheet while slackening at appropriate pitches. The one shown in Fig. 3 has a continuous loop-shaped face piece 4 attached to one side of the waterproof sheet 1, the one shown in Fig. 3 has many mushroom-like projections 5 protruding from one side of the waterproof sheet 1, and the one shown in Fig. What is shown in the figure is a waterproof sheet 1 in which a large number of linear protrusions 6 or ridges each having a T-shaped cross section are arranged in rows on one side.

Therefore, the waterproof sheet of the present invention is a waterproof sheet having protrusions or protrusions on one side as shown in FIGS. 1 to 4 above, and a water-permeable layer formed on the other side. An example of this will be described with reference to FIGS. 5 and 6. First, what is shown in Figure 5 is the first
This is an example of the waterproof sheet of the present invention in which a water-permeable layer 7 is formed by pasting a nonwoven fabric on the other surface of the waterproof sheet shown. This waterproof sheet is pasted on the surface of the primary tunnel track with the net 2 side facing the inside of the tunnel and the water permeable layer 7 facing the surface side of the primary track, and concrete is sprayed on top of it. When the next construction is carried out,
As the sprayed concrete hits the slackened net 2, the impact caused by the spraying is alleviated, and it also penetrates into the mesh 2 and gets entangled with the net 2 and bites into it, making it waterproof. A good secondary concrete layer can be formed without damaging the adhesive sheet 1.

Further, since the water permeable layer 7 discharges water exuding from the surface of the primary tunnel track to the lower part of the tunnel, etc., the water stopping effect is also improved.

The waterproof sheet of the present invention is not limited to the above-mentioned examples, and may be one in which a nonwoven fabric is attached to the other side of the waterproof sheet to form a water-permeable layer, as shown in FIGS. 2 to 4. Of course.

Next, what is shown in FIG. 6 is another example of the waterproof sheet of the present invention in which a water permeable layer 8 is formed by providing protrusions at appropriate intervals on the other surface of the waterproof sheet shown in FIG.

This waterproof sheet is pasted on the surface of the primary track of a tunnel, with the loop-shaped facepiece 4 facing inside the tunnel and the water permeable layer 8 facing the surface of the primary track, and then concrete is sprayed onto it. When the secondary track is constructed, a secondary track similar to the above example can be formed.

Although the waterproof sheet of the present invention has the water-permeable layer 8 formed on the other side of the waterproof sheet shown in FIG. 2, the present invention is not limited to this, and the waterproof sheet shown in FIG. Of course, it is also possible to use a waterproof sheet in which a water-permeable layer is formed by providing protrusions at appropriate intervals on the other surface of the sheet.

Although the example above has been described in which the waterproof sheet is attached to the surface of the primary footwork of a tunnel, the waterproof sheet of the present invention is also useful for use in waterproofing buildings, for example, roofs.

[Effect of idea]

The present invention is as described above, and has mesh-shaped, loop-shaped, mushroom-shaped, or T-shaped projections or protrusions on one side of the waterproof sheet, which are attached to the surface of the primary footing. If the secondary construction is carried out using shotcrete after the waterproofing is carried out, the projections and ridges will reduce the impact of the spraying, so the waterproof sheet will be protected from the impact of the spraying and there will be no risk of damaging the sheet. However, the concrete entangles and bites into the protrusions and ridges, forming an extremely good secondary track.

In addition, since a water-permeable layer is formed on the other side of the waterproof sheet, even if water comes out from the primary layer during or during the construction of the secondary layer, the water can be discharged from the water-permeable layer to the outside. Therefore, the water stopping effect is improved.

In addition, the waterproof sheet of the present invention is useful not only when constructing a secondary track using shotcrete as described above, but also when constructing a secondary track using a formwork. Even when used as a waterproof sheet for roofs, etc. for construction purposes, an extremely good waterproofing effect can be obtained.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a waterproof sheet with a mesh pasted on one side with appropriate pitches, Figure 2 is a cross-sectional view of a mesh with a continuous loop-shaped face piece pasted on one side, and Figure 3 is the same. A cross-sectional view of a sheet with a large number of mushroom-like protrusions protruding from one side, FIG. 4 is a cross-sectional view of a sheet with a large number of linear T-shaped protrusions or protrusions on one side, and FIG. 5 is a waterproof sheet of the present invention. FIG. 6 is a sectional view showing another embodiment of the waterproof sheet of the present invention. DESCRIPTION OF SYMBOLS 1... Waterproof sheet, 2... Net, 4... Loop-shaped facepiece, 5... Mushroom-shaped protrusion, 6... T-shaped cross-section protrusion, 7, 8... Water-permeable layer.

Claims (1)

[Scope of utility model registration request] A mesh-shaped, loop-shaped, mushroom-shaped, or T-shaped projection or ridge is provided on one side of the waterproof sheet, and a water-permeable layer made of nonwoven fabric or ridges is provided on the other side of the waterproof sheet. A waterproof sheet characterized by forming.