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我省近年来装配式钢筋混凝土小跨径桥梁发展较快,但10米以上大中跨径的桥型转构仅有“ T”梁一种。“T”梁构件重大,造价高,安装困难,桥下净空小。为了解决平原地区一般通航河道(河面宽15米至25米左右)满足通航和排灌的要求,采用较大跨径单跨过河,同时简化下部结构,降低造价,节约材料,在各级领导的指示鼓励下,试建成功净跨15米的装配式钢筋混凝土三铰框架式坦拱桥。在此基础上,嘉兴县交通局桥梁队又创造了净跨15米的装配式钢筋混凝土八字形拱桥。兹将这两种桥型的特点和施工经验介绍于后:
In recent years, the province has witnessed a rapid development of the assembly-type small-span reinforced concrete bridges, but only the “T” beam type of bridge-type structure with a span of more than 10 meters. “T” Beam components, high cost, installation difficulties, small headroom under the bridge. In order to solve the problems of navigation and irrigation and drainage in general navigation channels in the plain area (width of 15 meters to 25 meters), a single spanned river with a larger span will be adopted to simplify the substructure, reduce costs and save materials. Leaders at all levels Encouraged by the instructions, the successful construction of a net span of 15 meters of prefabricated reinforced concrete three-hinge frame arch bridge. On this basis, Jiaxing County Department of Transportation Bridge team also created a net span of 15 meters of assembled reinforced concrete arch bridge. I hereby introduce the characteristics of these two types of bridge and construction experience after: