江顺大桥主桥Z4号墩钻孔桩施工关键技术  

Key Techniques for Construction of Bored Piles of Pier Z4 of Main Bridge of Jiangshun Bridge

作　　者：胡勇[1] 张家伦[1] 杨二永[1] 

机构地区：[1]中铁大桥局集团第四工程有限公司,江苏南京210031

出　　处：《桥梁建设》2013年第1期116-121,共6页Bridge Construction

摘　　要：江顺大桥主桥为主跨700m的双塔双索面混合梁斜拉桥,其Z4号墩采用28根3.0m钻孔灌注桩,桩长47.5～72m,钻孔深度达81.5m。针对该墩深水、浅覆盖层、斜岩面、超硬岩质、岩层分布不均、夹层多等不利现象,采取超前地质钻孔、针对性钻孔平台设计与快速施工、选择APE400B单锤插打钢护筒、分区域配置冲击钻和回旋钻、严格控制泥浆指标和钻进参数等关键技术措施,在洪峰来临前完成全部钻孔桩施工。超声波检测显示28根桩基质量均满足设计和规范要求。The main bridge of the Jiangshun Bridge is a hybrid girder cable-stayed bridge with double pylons,double cable planes and with a main span 700 m.The Pier Z4 of the bridge is supported on the foundation of 28 nos.of 3.0 m bored piles that are 47.5~72 m long and have the greatest boring depth up to 81.5 m.In the light of the disadvantageous construction conditions of the deep water,shallow overburden,inclined rock surface,very hard rock,non-uniform distribution of rock strata and sandwich at the location of the pier,the bored piles were constructed with the following key technical measures,including those of the geology boring in advance,purposive design and rapid construction of the boring platform,driving of the steel casings by the APE400B single hammer,utilizing of the percussion boring and rotary boring for the piles in different areas and strict control of the slurry indices and boring parameters.The construction of all the piles was finally smoothly completed before the arrival of the flood peak and the inspecting of the piles by the ultrasonic detection proved that the quality of the 28 nos.of the piles could all meet the relevant requirements in the design and codes.

关 键 词：斜拉桥 基础 钻孔灌注桩 桥梁施工 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U443.154[交通运输工程—道路与铁道工程]