常泰长江大桥主塔下横梁支架设计与施工工艺研究  

Design and Construction Process of Cross‑Beam Supports for Main Tower of Changtai Changjiang River Bridge

作　　者：曾健 胡培 王超[3] ZENG Jian;HU Pei;WANG Chao(CCCC Wuhan Harbour Engineering Design and Research Co.,Ltd.,Wuhan,Hubei 430040,China;Hubei Key Laboratory of Advanced Materials&Reinforcement Technology Research for Marine Environment Structures,Wuhan,Hubei 430040,China;National Enterprise Technology Center,CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430040,China)

机构地区：[1]中交武汉港湾工程设计研究院有限公司,湖北武汉430040 [2]海工结构新材料及维护加固技术湖北省重点实验室,湖北武汉430040 [3]中交第二航务工程局有限公司技术中心,湖北武汉430040

出　　处：《中外公路》2024年第6期185-190,共6页Journal of China & Foreign Highway

基　　金：中交集团科研基金项目(编号:2020-ZJKJ-03)。

摘　　要：常泰长江大桥主塔下横梁结构施工具有施工高度高、混凝土方量大、下挠变形难控制的特点。为实施主塔下横梁的浇筑施工,在下横梁处设置落地式钢管支架,用于支撑下横梁模板及承担混凝土浇筑期间的荷载。通过有限元软件分析计算,发现在下横梁支架纵梁的跨中设置“八”字钢管撑,同时在纵梁的中跨和边跨处设置断缝,可以有效控制下横梁主体结构不对称变形,并优化支架的整体受力。支架采用地面组装、焊接,地面验收完成之后再整体吊装的施工方案,理论计算与施工工艺相结合,减少了高空作业,有效保证了支架的施工质量和施工效率,提升了主塔下横梁的浇筑质量,取得了显著的经济效益。The construction of the lower cross-beam structure of the main tower of Changtai Changjiang River Bridge has the characteristics of high construction height,large amount of concrete earth volume,and difficult control of down-warping deformation.In order to implement the pouring of the lower crossbeam of the main tower,floor-type steel pipe supports were set at the lower cross-beam,which were used to support the lower cross-beam formwork and bear the load during the concrete pouring.Through the finite element software analysis and calculation,it was found that the asymmetric deformation of the main structure of the lower cross-beam could be effectively controlled,and the overall force of the supports could be optimized by setting the splayed steel pipe supports in the midspan of the longitudinal beam of the lower cross-beam and making broken joints in the midspan and side span of the longitudinal beam.The supports were assembled,welded,and accepted on the ground.Then they were lifted and fixed to the installation level after completion.The combination of theoretical calculation and construction process reduces the high-altitude operation,effectively guarantees the construction quality and efficiency of the supports,improves the pouring quality of the lower cross-beam of the main tower,and achieves remarkable economic benefits.

关 键 词：桥梁施工 下横梁支架 非对称荷载 有限元分析 

分 类 号：U445.469[建筑科学—桥梁与隧道工程]