非对称槽形梁斜拉桥跨高速铁路安全防护技术

Safety Protection Technology of Asymmetric Channel Beam Cable- stayed Bridge Crossing High-speed Railway

沪昆客运专线长沙枢纽联络线有两座主跨为(32+80+112)m非对称槽形梁独塔斜拉桥,桥梁上跨武广高速铁路,采用水平转体施工,转体重量为14 500 t,桥梁主墩承台边缘与武广高速铁路路基段最近侧线路中心距13.4 m,安全防护难度大。针对临近运营高速铁路的路、桥复杂环境条件,首次对临近高速铁路的构筑物建立了全方位安全防护体系,分别从基础施工、主塔施工、槽形梁浇筑等方面的安全防护技术进行了研究,有效确保武广高速铁路不受任何外部施工环境影响,保证高速铁路运营安全。

There are two channel beam single pylon cable-stayed bridges with the main span of （32＋80＋112）m located on Changsha terminal connecting line of Shanghai-Changsha passenger dedicated railway, overpassing Wuhan-Guangzhou high-speed railway. The horizontal rotating construction technology with the swivel erection weight of 14 500 tons is a-dopted, the distance between the edge of main pier bearing platform of bridge and the center line of the nearest side of subgrade section of Wuhan-Guangzhou high-speed railway is 13. 4 m, there is great difficulty in safety protection. Ai-ming at the complex environmental conditions close to the operating high-speed railway, all-around safety protection sys-tem is firstly established for the structures nearby, and study on safety protection techniques for foundation construction, main tower construction and channel beam pouring, etc. is performed to ensure the operation safety of Beijing-Guang-zhou high-speed railway, free of any external construction impact.