外海环境斜拉桥弧线形索塔施工关键技术
摘要：宁波舟山港主通道公路工程主通航孔桥为跨海特大斜拉桥，索塔采取空间双曲面弧线形设计。通过使用GPS静态测量技术，建立了施工测量控制网，确保索塔线形符合设计要求；通过钢管主动横撑和预应力拉杆的应用，解决了索塔悬臂施工过程中内应力难题，避免了塔柱混凝土根部开裂；通过加工制造索道管及钢锚梁锚固点定位盘，配合螺杆精调的方式，快速且高精度地完成了索道管和钢锚梁定位安装。
关键词：桥梁工程斜拉桥索塔测量悬臂
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参考文献[1] 詹新武，周世健，易志华.GPS静态测量在杭州湾跨海大桥中的应用[J].地理空间信息，2007(3):59-61.
[2] 杨宇波.大曲率圆弧形塔柱的主动横撑设计分析[J].建筑施工，2019,41(3):168-170.
[3] 徐登云，孙小猛，赵飞，等.超高钻石型索塔“拉杆—撑杆”优化设计方法研究[J].铁道标准设计，2015,59(4):49-52,57.
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[2] 杨宇波.大曲率圆弧形塔柱的主动横撑设计分析[J].建筑施工，2019,41(3):168-170.
[3] 徐登云，孙小猛，赵飞，等.超高钻石型索塔“拉杆—撑杆”优化设计方法研究[J].铁道标准设计，2015,59(4):49-52,57.
[4] 张海岐.斜拉桥索道管空间多点定位技术研究探讨[J].湖南交通科技，2006(4):85-87.
[5] 陈竹，涂哲，刘正辉.澜沧江大桥钢锚梁单元精确定位安装施工技术[J].公路，2018,63(6):126-129.
Key Construction Technology of Arc-shaped Cable Tower of Offshore Cable-stayed Bridge
Abstract: The main channel bridge of Zhoushan port in Ningbo is a super large cable-stayed bridge crossing the sea. The cable tower is designed with spatial hyperboloid arc shape. GPS static measurement technology is used in the main navigation bridge, and the construction survey control network is established. It ensure that the cable tower line meets the design requirements. Through the design of steel pipe active cross brace and prestressed tie rod, the problem of internal stress in cantilever construction of cable tower is solved, and cracking of concrete tower column root is avoid. Through manufacturing cable duct and steel anchor beam anchor point positioning plate combining with the way of screw fine adjustment, the positioning and installation of cableway pipe and steel anchor beam are completed quickly and accurately.
Keywords: bridges; cable stayed bridges; cable tower; measurement; cantilever
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