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隧道复合式衬砌中间铺1～2毫米厚塑料板,作为永久防水层,已在国外一些隧道工程上开始应用。实践证明,使用塑料板作防水层修建的隧道,收到了干燥无水的良好效果。我国目前在京广线衡韶段增建第二线工程,其中大瑶山隧遭的衬砌结构设计,除在进出口局部浅埋偏压地段采用整体现浇防水混凝土外,其余地段均采用复合式衬砌,即喷混凝土临时支护与二次模注混凝土永久支护中间,设置2毫米厚的聚氯乙烯软板,作
Tunnel lining the middle of composite lining shop 1 ~ 2 mm thick plastic plate, as a permanent waterproof layer, has some tunnel projects in foreign countries began to apply. Practice has proved that the use of plastic plates for the construction of the waterproof layer of the tunnel, received a good effect of dry and anhydrous. At present, the construction of the second line project in Hengshao section of Beijing-Guangzhou line is being built. The design of the lining structure of Dayao Mountain Tunnel, except for the partially cast-in-place waterproof concrete at the partial shallow partial pressure in the import and export, adopts composite lining, That is, temporary concrete spray support and secondary injection of concrete permanent support the middle, set 2 mm thick PVC soft plate for