大跨径异形斜塔斜拉桥无支架施工关键技术研究  

STUDY ON KEY TECHNOLOGY FOR NO-BRACKET CONSTRUCTION OF LARGE-SPAN SPECIAL-SHAPED INCLINED-PYLON CABLE-STAYED BRIDGE

作　　者：闫武 高启战 唐运明 YAN Wu;GAO Qi-zhan;TANG Yun-ming(The Nine Engineering Coltd of Cccc First Highway Engineering Co.,Ltd.,510000,Guangzhou,China)

机构地区：[1]中交一公局第九工程有限公司,广州510000

出　　处：《建筑技术》2024年第10期1210-1214,共5页Architecture Technology

摘　　要：永定河特大桥主桥110m+50m+40m的梁固结体系独斜塔斜拉桥,该桥跨越永定河北小捻与南前卫埝。基于高斜塔分段预制安装难度大、焊接变形控制难度大、索力调整与线形控制难度大等施工难题,研究了主梁及主塔施工关键技术。主梁采用履带式起重机和临时支架配合施工,主塔分16个节段,采用无支架安装工艺进行施工,研究并详细阐述了临时支架搭设、临时索施工、主塔吊装、节段连接等关键技术,并提出了钢箱梁精确定位与线形控制措施。数值模拟结果表明:支架各主要杆件的强度、变形及地基承载力均满足设计规范要求。The beam reinforcement system of the main bridge(110 m+50 m+40 m) of Yongding River Grand Bridge is an inclined-pylon cable-stayed bridge,spanning North Xiaonian and South Qianweinian of the Yongding River.In order to overcome the construction difficulties in installation of prefabricated high inclined-pylon sections,weld deformation control,cable force adjustment and alignment control,the key technology for main beam and tower construction was studied.Main beams are constructed with crawler cranes and temporary supports,while main towers consisting of 16 sections are constructed by means of no-bracket installation.Key technologies for temporary support erection,temporary cable construction,main tower hoisting and section connection were studied and described in detail,and measures for precise positioning and alignment control of steel box girders were proposed.Numerical simulation results have shown that the strength and deformation of main members of supports and bearing capacity of foundations meet the design specifications.

关 键 词：桥梁工程 异形斜塔 无支架施工 临时支架 线型控制 索力调整 

分 类 号：TU74[建筑科学—建筑技术科学]