| 摘要 |
PURPOSE:To avoid the thinning and breakdowns of waterproof sheets due to vertical elongation by gravity and to ensure reliable seal in the construction of heat seal type wafterproof sheets for tunnel, and to seal waterproof sheets in tunnel arch portion reliably too. CONSTITUTION:When heat seal type waterproof sheets 4 are heat sealed to waterproof sheet attaching members 1 provided on the tunnel surface to be covered primarily, the waterproof sheets are overlapped on the attaching members through specified heating wires 5 of special extended shape. A current is flowed in the heating wires to heat-seal the waterproof sheets to the attaching members. |
