高墩大跨刚构桥平面转体关键控制技术

Key Control Technology for Plane Rotation of High-pier Long-span Ridge Frame Bridge

摘要:

某跨铁路桥梁采用80 m+142 m+142 m+80 m预应力混凝土连续刚构跨越6条铁路线，为降低桥梁施工对铁路运营的影响，采用了先平行铁路方向悬臂分节段浇筑3个T形刚构，然后再平面转体合龙的设计方案。结合该桥的转体施工设计，详细介绍了承重系统、牵引系统、平衡系统等关键技术的分析过程。根据计算结果，转体施工能满足桥梁施工安全和铁路运营安全需求。

Abstract:

A cross-railway bridge is a (80+142+142+80)-m prestressed concrete continuous rigid-frame bridge spanning six railway lines. In order to reduce the impact of bridge construction on railway operations, the design scheme of pouring three T-shaped rigid frames in parallel to the railway direction by cantilever segments is adopted, followed by plane rotation closure. Combined with the rotation construction design of the bridge, the analysis process of key technologies such as load-bearing systems, traction systems and balance systems is introduced in detail. According to the calculation results, the rotation construction can guarantee the safety of bridge construction and the requirements of railway operation.