双屿门通航孔桥六横侧索塔桩基施工关键技术  

Key Construction Technologies for Pile Foundation of Cable Tower on Liuheng Side of Shuangyumen Navigable Bridge Opening

作　　者：连延金 LIAN Yanjin(China Railway Construction Bridge Engineering Bureau Group 1st Engineering Co.Ltd.,Dalian Liaoning 116033,China;Tianjin Key Laboratory of Prefabricated Bridge Intelligent Construction Technology and Equipment,Tianjin 300300,China)

机构地区：[1]中铁建大桥工程局集团第一工程有限公司,辽宁大连116033 [2]天津市装配式桥梁智能建造技术与装备重点实验室,天津300300

出　　处：《铁道建筑技术》2025年第1期131-134,149,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技重大专项(2020-A01);中国铁建股份有限公司科技研发计划项目(2022-B05,2023-B10);中国铁建大桥工程局集团有限公司科技创新项目(DQJ-2023-A04,DQJ-2023-C70)。

摘　　要：双屿门通航孔桥为宁波舟山港六横公路大桥二期工程的控制性工程,采用双塔单跨吊悬索桥,缆跨布置为(600+1 768+645)m,设计标准为双向四车道一级公路,时速100 km。六横侧索塔基础在海陆交界岸边,施工难点多,如基础作业平台建造难、环保要求高、钻孔桩成孔难、钢护筒防腐涂层保护难等。针对施工难点采用如下关键技术:一是填筑混凝土平台技术,经原地面凿台阶、设锚桩等步骤形成混凝土浇筑的支撑结构,形成桩基础施工平台,避免外围水侵入,减小对海洋生态和地质环境影响,增强结构强度和稳定性;二是钻孔桩施工技术,采用旋挖钻清水钻孔并分六级成孔。该索塔桩基于2023年1月13日开钻,7月17日完成最后一根桩,历时185 d,为后续承台及塔柱施工奠定了基础。The Shuangyumen navigable bridge opening is a control project of the second phase of the Liuheng Highway Bridge of Ningbo Zhoushan Port.It adopts a two-tower single-span suspension bridge.The cable span layout is(600+1768+645)m.The design standard is a two-way four-lane first-class highway with a speed of 100 km/h.The foundation of the cable tower on the Liuheng side is at the shore where the sea and land meet.There are many construction difficulties,such as the difficulty in building the foundation operation platform,high environmental protection requirements,difficulty in forming holes for bored piles,and difficulty in protecting the anti-corrosion coating of steel casings.In response to these construction difficulties,the following key technologies are adopted.First,the technology of filling concrete platforms.Through steps such as chiseling steps on the original ground and setting anchor piles,a supporting structure for concrete pouring is formed to create a construction platform for pile foundations,avoiding the intrusion of peripheral water,reducing the impact on the marine ecology and geological environment,and enhancing the structural strength and stability.Second,the construction technology of bored piles.Rotary drilling with clear water is adopted and holes are formed in six stages.The pile foundation of this cable tower started drilling on January 13,2023,and completed the last pile on July 17.It took 185 days and laid a foundation for the subsequent construction of pile caps and tower columns.

关 键 词：跨海桥梁 临岸基础 悬空区 填筑混凝土平台 钻孔桩 旋挖钻 分级成孔 永久钢护筒 

分 类 号：U443.15[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]