深水基础自锚式悬索桥设计与施工  

Design and Construction of Self-Anchored Suspension Bridge with Deepwater Foundations

作　　者：吴巨军 赵林强 李茜茜 WU Jujun;ZHAO Linqiang;LI Qianqian(Hangzhou Urban Construction Design&Research Institute Co.,Ltd.,Hangzhou 311400;Engineering Design Group Co.,Ltd.,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]杭州市城建设计研究院有限公司,杭州311400 [2]浙江工业大学工程设计集团有限公司,杭州310014

出　　处：《公路交通技术》2021年第1期54-59,65,共7页Technology of Highway and Transport

摘　　要：青田前仓大桥主桥为(45+120+45)m预应力混凝土自锚式悬索桥,半飘浮约束体系,是国内水深最大的自锚式悬索桥。该桥的创新如下:桥塔基础采用大直径嵌岩钢管混凝土桩,解决了深水裸岩基础桩基定位及成孔问题,形成的钢-混凝土组合结构提高了桩基的承载力;采用无应力状态法作为自锚式悬索桥体系转换控制方法,解决了分阶段张拉自锚式悬索桥的安装计算和施工控制问题,提高了施工效率和控制精度。The main bridge of Qiancang Bridge in Qingtian County,is a prestressed concrete self-anchored suspension bridge with spans of(45+120+45)m and the largest water depth in China.The bridge has a half floating system.The ground setting of the tower features bare bedrocks,specifically the 1m thick gravel overlying the intermediary-weathered granite that can served as the bearing stratum.The maximum water depth reaches 27.5m,which makes this bridge as the self-anchored suspension bridge with the largest water depth in China.The large diameter concrete-filled steel pipe piles to be built into rocks are selected for the tower foundations,which is very innovative.It solves the problem of pile foundation positioning and hole formation in deep-water&bare-rock foundations,and the formed steel-concrete composite structure greatly improves the bearing capacity of the pile foundation.The method of stress-free status is used as the system conversion control method of the self-anchored suspension bridge,which solves the problems of the installation calculation and construction control of the self-anchored suspension bridge tensiled in stages,and greatly improves the construction efficiency and control accuracy.

关 键 词：自锚式悬索桥 钢管混凝土桩 锌铝合金镀层钢丝 无应力状态控制法 深水 裸岩 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]