| 摘要 |
PURPOSE: A waterproof sheet is provided to easily waterproof a tunnel by being integrated with an unwoven fabric and to increase water drainage with a pored pipe placed on the unwoven fabric. CONSTITUTION: A waterproof sheet(1) is installed inside a shotcrete(S) poured into a basic tunnel. The waterproof sheet and an unwoven fabric are layered each other to be integrated and the waterproof sheet is connected to the other sheet by a thermal bonding method. The continuously connected waterproof sheets are fixed to the shotcrete layer using a fixing nail(T) and a lining concrete(R) is poured into the waterproof layer. Therefore, underground water is prevented from being permeated through the tunnel.
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