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突山二桥为主跨长230m的预应力混凝土边主梁斜拉桥,两侧的边跨各长117m。该桥采用三跨连续飘浮体系、边跨设置辅助墩的结构型式,飘浮体系减小了主梁的拉应力,降低了桥塔横梁的建造以及支座的使用费用;辅助墩降低了车辆荷载引起的主梁位移和裂缝的产生,增加了边跨的刚度。主梁采用预应力混凝土边主梁结构,采用满堂支架现浇加挂篮悬臂浇筑法施工。桥塔采用H形塔,设1道横梁。施工时,挂篮先在桥塔基础处拼装,然后被提升到主梁上;挂篮采用永久斜拉索支承,以减小已浇筑好的梁段顶面的拉应力。
The main suspension bridge spanning 230m is a cable-stayed bridge with two sides spanning 117m each. The bridge adopts three-span continuous floating system, and the side span is provided with the structure type of the auxiliary pier, the floating system reduces the tensile stress of the main girder, reduces the construction of the bridge tower crossbeam and the use cost of the bearing; the auxiliary pier reduces the load caused by the vehicle The displacement of the main girder and the generation of cracks increase the rigidity of the side span. The main girder adopts prestressed concrete side girder structure, and adopts full-floor frame cast-in-place plus cantilever pouring construction method. Tower H tower with a cross beam. During the construction, the hanging basket is assembled at the foundation of the pylon and then lifted to the main beam; the hanging basket is supported by a permanent stay cable to reduce the tensile stress on the top surface of the cast-in-place beam.