JPS6156399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for completely preventing water leakage in tunnels, particularly in mountain tunnels, in order to prevent water leakage in advance and improve the durability of the tunnel and the safety of passage.

As is well known, water leaks occur in more than half of railway tunnels and passageway tunnels.

Water leakage from this tunnel not only causes frost damage and cracks in the concrete lining, but also accelerates deterioration and reduces the functionality of electrical equipment.
This has become a major problem in terms of maintenance management.

Therefore, the present invention aims to propose a full-scale water leakage prevention construction method for preventing water leakage in tunnels.

That is, the present invention provides a tunnel in which a secondary lining concrete layer is formed on a primary lining concrete surface, in which a leakage prevention sheet made of a nonwoven fabric adhered to the back side of a thermoplastic synthetic resin sheet is adhered to the primary lining concrete surface. The adhesive seal piece is then folded back and adhered to the seat side, and the seam of the water leak prevention sheet is formed by overlapping the nonwoven fabric of one water leak prevention sheet. After removing only a portion of the water and temporarily fixing it with double-sided adhesive tape, leaving the welded part, welded the welded part with hot air, and at the same time, sandwiched the drain material inside the lower edges of both sides of the leakage prevention sheet stretched over the primary lining concrete surface. It is designed to be folded in, and then nailed to the primary lining concrete surface using pegs.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a tunnel using the Natom construction method.

The Natom construction method is a tunnel construction method developed in Austria. First, a primary lining concrete layer 1 is formed by spraying on the inner surface of an excavated tunnel, and then lock bolts 2 are placed around the circumference at appropriate intervals. After further providing retractable shoring (not shown), 2
This is a tunnel construction method in which a concrete lining layer 3 is formed, and a high-strength tunnel is obtained by the retention force of the rock bolts 2 placed in the ground.All recent mountain tunnels use this construction method. There is.

However, in the process of forming the secondary lining concrete layer 3 by spraying in general tunnels, including tunnels using the Natom construction method,
1 before the next concrete lining layer 3 is completely hardened.
Even if water leakage begins at a weak point in the secondary lining concrete layer 1 and cracks occur in the secondary lining concrete layer 3, or even if no cracks occur due to water leakage at the time of completion, the primary lining concrete layer 1 is generally thin. There was a drawback in that water stagnant between the primary concrete lining layer 1 and the secondary concrete lining layer 3 caused gridlock.

Therefore, the present invention aims to provide a full-scale water leakage prevention method that does not cause cracks to occur in the secondary lining concrete layer 3 even if water leaks due to cracks or penetration of the concrete layer in the primary lining concrete layer 1. It is.

That is, as shown in FIG. 2, the present invention provides a water leak prevention sheet SH in which a nonwoven fabric 5 is adhered to the back surface of a thermoplastic synthetic resin sheet 4, such as an EVA or PVC sheet, on the surface of a primary lining concrete layer 1. peg 6
The primary lining concrete layer 1 is covered entirely with a sheet 4 to prevent water leakage, and a nonwoven fabric 5 to guide water leakage to both sides of the tunnel. This is the first feature.

The second feature is that at the seam between the water leakage prevention sheets SH and SH', the nonwoven fabric 5 of one of the water leakage prevention sheets SH' is removed by the amount of overlap, and the sheet 4a of the overlapped portion is connected to the water leakage prevention sheet SH. The sheet 4 and the welded part are temporarily fixed with double-sided tape 7, leaving the welded part, and the welded part X is welded with a hot air welding machine.

In other words, according to this construction method, the water leakage prevention sheet
This makes it possible to quickly and skillfully install SH and SH' onto the primary lining concrete layer, thereby shortening the number of construction days.

The third feature is that when fixing the nail, an adhesive seal piece 8 made of unvulcanized butyl rubber or the like is applied and the nail 6 is driven in, and after driving, one end 8a is folded back and glued to form the nailed part. This is to seal it. Note that 9 is a washer.

This has the practical benefit of being able to easily and reliably seal the nailed portion.

The fourth feature is that the lower edges on both sides of the leakage prevention sheet stretched over the concrete surface of the primary lining are sandwiched and folded inward with the drain material 10 as shown in Figure 3, and the primary lining is secured with pegs 11. This is done by nailing it to the concrete surface.

With this configuration, water leaking from the primary concrete lining 1 is guided by the nonwoven fabric 5 and guided to the drain material 10, and the drain material 10 is connected to the sewer 1.
If drainage pipes 13 connected to the non-woven fabric 2 and provided at appropriate intervals are connected, water stagnant in the non-woven fabric 5 can be efficiently drained.

As described above, the construction method of the present invention allows construction to be carried out quickly and effectively prevents water leakage on the entire surface.Moreover, the method of the present invention is capable of efficiently preventing water leakage on the entire surface. Even if there is a protrusion, the water leakage prevention sheet SH lined with non-woven fabric 5 can be stretched tightly and tightly, making it suitable not only for conventional tunnel construction methods, but also as a full-scale leakage prevention construction method for tunnels using the Natom construction method. It is suitable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part thereof, and FIG. 3 is an enlarged sectional view of section A in FIG. 1. 1...Primary lining concrete layer, 2...Lock bolt, 3...Second lining concrete layer, 4
... Thermoplastic synthetic resin sheet, 5 ... Nonwoven fabric, 6
and 11... peg, 7... double-sided adhesive tape, 8...
...Adhesive seal piece, 9...Washer, 10...Sealing material.

Claims (1)

[Claims] 1. In a tunnel in which a secondary lining concrete layer is formed on the primary lining concrete surface, a leakage prevention sheet made of a non-woven fabric adhered to the back side of a thermoplastic synthetic resin sheet is applied, and an adhesive sealing piece is attached to the primary lining concrete surface. Then, the adhesive seal piece is folded back and adhered to the seat side, and the seam of the water leak prevention sheet is made by removing the nonwoven fabric of one water leak prevention sheet by an amount equal to the amount of overlap. Temporarily secure the welded area with adhesive tape, and hot-air weld the welded area. At the same time, fold the lower edges of both sides of the leakage prevention sheet stretched over the primary lining concrete surface with drain material inward, and secure with pegs. A full-scale leakage prevention method for tunnels that is characterized by nailing to the primary lining concrete surface.