(1)钢筋混凝土桥是否需要按照标准图设置防水层的问题。近十几年来,桥面铺装是采用新的标准图,加铺防水层的。过去桥面铺装,我们一般只在钢筋混凝土桥面板上抹一层水泥沙浆,厚度不超过5厘米,作为磨耗层用;而对于钢筋的防护、预防水份侵蚀等,是靠梁板设计时所预留的保护层,即钢筋与梁板处边沿的净距,大约不会超过三厘米。我们曾经检查了三座这 (1) Whether the reinforced concrete bridge needs waterproofing layer according to the standard drawing. Over the past decade, the bridge deck is the use of a new standard map, plus waterproof layer. Bridge deck over the past, we generally only in the reinforced concrete deck wiping a layer of cement mortar, the thickness of not more than 5 cm, as wear layer; and for the protection of steel to prevent water erosion, etc., is by the beam design The reserved protective layer, that is, the clear distance between the edges of rebars and slabs, should not exceed three centimeters. We have checked three of these