椒江特大桥超长钻孔桩施工关键技术  

Key Engineering Technology of Super-long Bored Pile of Jiaojiang River Super Major Bridge

作　　者：曹祥 马晓东[2] 徐菲 邬静 陈春安 CAO Xiang;MA Xiaodong;XU Fei;WU Jing;CHEN Chun’an(General Contracting Business Department,China Railway Design Corporation,Tianjin 300308,China;Hangzhou-Shaoxing-Taizhou Railway Project Department,China Railway Major Bridge Engineering Group Co Ltd,Wuhan Hubei 430000,China;Hang-Shao-Tai Railway Co.,Ltd.,Hangzhou Zhejiang 311215,China)

机构地区：[1]中国铁路设计集团有限公司总包事业部,天津300308 [2]中铁大桥局集团有限公司杭绍台铁路项目部,湖北武汉430000 [3]杭绍台铁路有限公司,浙江杭州311215

出　　处：《中国铁路》2022年第10期62-67,共6页China Railway

摘　　要：杭绍台铁路椒江特大桥主塔墩基础设42根φ2.5 m的钻孔桩,设计桩长达136.7 m,属于我国高铁领域超长钻孔桩基础。墩位处地质复杂,施工前需针对特殊地质的超长钻孔桩开展各项科学研究。为满足工期及工艺要求,有针对性地采取了各项关键技术:由于我国目前无满足此桩长的旋挖设备,专门定制了加长钻杆的旋挖钻机进行施工;搭设了水上钻孔平台作为施工场地,通过钢栈桥与岸边场地有效拉通;科学确定成孔、成桩工艺参数,采用按照配比制备优质泥浆进行护壁、制拌并浇筑高性能混凝土等工艺工法,以优质高效地完成钻孔桩施工。The Jiaojiang River Super Major Bridge of Hangzhou-Shaoxing-Taizhou HSR chooses underwater piers for both the main towers,each of which is equipped with 42136.7 m-longφ2.5 m bored piles,super-long bored pile foundation as categorized by China’s HSR system.Given the complexity of the geological conditions,research is carried out before construction to meet the engineering requirements within the designated time.A drilling platform is set up in water as the construction site where a steel trestle is used for an effective connection with shore site.Given the lack of a proper rotary drilling equipment,a rig with long drill rod is customized for the project.At the same time,high-quality slurry for wall protection,preparation and use of high-performance concrete as well as other key technologies are essential to ensure the quality and efficiency of the project.

关 键 词：杭绍台铁路 椒江特大桥 斜拉桥 钻孔桩 淤泥层 旋挖钻机 

分 类 号：U445[建筑科学—桥梁与隧道工程]