常泰长江大桥5号墩索塔下塔柱施工关键技术

作者：黄甘乐¹’² ,吕昕睿¹’³,孙南昌¹’³

作者简介：

黄甘乐，检测工程师，工程师，E-mail: 2535717787@qq.com

作者单位：

1.中交第二航务工程局有限公司，湖北武汉 430040；2.长大桥梁建设施工技术交通行业重点实验室，湖北武汉 430040；3.中交公路长大桥建设国家工程研究中心有限公司，北京 100088

基金项目：

*中交集团科技研发计划课题（2020-ZJKJ-03）

摘要：

常泰长江大桥主塔采用钢混混合空间钻石形构型，结构复杂，施工难度大。为了探究索塔下塔柱在施工过程中的结构性能，采用MIDAS/Civil建立索塔有限元模型，对下塔柱施工进行了分析。结果表明：设置2道对拉杆能有效改善施工过程中塔肢根部拉应力；横桥向支架断开有利于下横梁线形控制；纵桥向下横梁对顶的有效顶推力、顶口相对位移与塔肢根部拉应力均呈线性关系；下横梁支架最大拉应力106MPa、最大压应力125MPa；现场实测结果表明施工方案安全可靠。

关键词：桥梁工程；斜拉桥；钻石形索塔；下塔柱；有限元分析；施工技术

English：

The main tower of Changtai Yangtze River Bridge adopts the steel-concrete mixed space diamond shape，the structure is complex and the construction is difficult. In order to explore the structural performance of the lower pylon during construction, the finite element model of the pylon was established by MIDAS/Civil software and the construction of the lower pylon was analyzed. The results show that setting two pull rod can improve the tensile stress at the root of the pylon during construction. The disconnection of the transverse bridge support is beneficial for its linear control of the lower crossbeam; The effective push force of the lower beam of the longitudinal bridge has a linear relationship with the relative displacement of the closing port and the tensile stress of the tower limb root.The maximum tensile stress of the bracket is 106MPa, and the maximum compressive stress is 125MPa; The on-site measurement results are in good agreement with the theoretical calculation results.

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