某城市地铁 区间跨 越多种 地貌 , 采用了混凝土自防水、复合衬砌防水、 排水设施设置等措施,图1为典型的隧道断面防排水设计。1 设计要点1.1 防止裂缝是防水设计的前提 (1) 在结构构造上,钢筋保护层厚度衬砌外缘50mm ,衬砌内缘30m m 。 混凝土的裂缝开展宽度允许值为0.2～ 0. A city subway section across a variety of landscapes, using a concrete self-waterproofing, composite lining waterproofing, drainage facilities and other measures, Figure 1 is a typical tunnel section drainage design. 1 Design Points 1.1 Preventing cracks is the prerequisite for waterproofing design (1) In structural structure, the thickness of reinforced protective layer lining the outer edge of 50mm, lining the inner edge of 30m m. Concrete crack width to allow the value of 0.2 ~ 0.