摘要
新建福厦高铁泉州湾跨海大桥为时速350 km的高速铁路桥,海上主桥为主跨400 m的双塔双索面半飘浮体系斜拉桥。主桥2座桥塔为高160.254 m(不含塔座)的仿贝壳造型的曲线H形桥塔,塔身采用C50海工高性能混凝土。塔柱起步节段采用翻模法施工,其余节段采用液压爬模法施工,标准节段单节浇筑高度为6 m。塔身设置上、下2道横梁,横梁与塔柱混凝土采用同步浇筑施工方案;上、下横梁分别采用附塔三角牛腿支架法和落地钢管支架法施工。通过合理选型与布置关键施工设备,保障了现场施工工效和施工安全;钢锚梁采用工厂预拼组装,现场整体吊装方案,提高了安装精度和效率;通过对塔柱海工混凝土配合比进行专项设计,并采取多重防开裂措施,有效降低了塔柱混凝土开裂风险;塔柱高程采用全站仪三维坐标法和悬高测量传递法控制精度,有效控制了塔柱线形和偏位。
The Quanzhou Bay Bridge of the newly-built Fuzhou-Xiamen High-speed Railway allows trains to run at a speed of 350 km/h.The sea-crossing main bridge,which is a two-pylon cable-stayed bridge of semi-floating system,features a main span of 400 m and double cable planes.The two pylons,drawn inspiration from shells,are quasi H-shaped structures rising 160.254 m(exclusive of the pedestal),of elliptical silhouette.The pylon columns are made of C50 high-performance marine concrete,the starter segments were constructed using jumping formwork,the remaining segments were constructed by hydraulic climbing formwork,and the concreting height of an individual typical segment was 6 m.A pylon is fitted with an upper and a lower cross beams that were cast in parallel with the pylon column casting.Pylon-mounted triangular brackets and ground scaffolds were installed for the cross beam casting.The structural form was chosen with care,and the key construction equipment was effectively laid out,which ensured the construction efficiency and safety.To improve the installation accuracy and efficiency,an integral hoisting and installation solution was selected.To effectively prevent the risk of pylon column cracking,the mixing proportion of the marine concrete was modified,and multiple-level anti-cracking measures were used.The three-dimensional coordinates of pylon columns were recorded using total station,and the suspended height measurement transfer method was used,to effectively control the pylon column geometry and displacement.
作者
罗长维
翁方文
LUO Chang-wei;WENG Fang-wen(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;Key Laboratory of Large-Span Bridge Construction Technology in Transport Field,Wuhan 430040,China)
出处
《世界桥梁》
北大核心
2022年第5期40-47,共8页
World Bridges
基金
中国铁路总公司科技研究开发计划课题(K2018G017)。
关键词
跨海桥
斜拉桥
桥塔
海工混凝土
线形控制
液压爬模法
施工技术
sea-crossing bridge
cable-stayed bridge
pylon
marine concrete
geometry control
hydraulic climbing formwork method
construction technique
