全套管钻机拔桩在立交桥拆除工程中的应用

Construction and Quality Control of Pile Pulling by Full Casing Drilling Machine in Interchange Bridge Demolition and Reconstruction Project

立交桥梁拆除改造工程结构复杂、涉及内容较多。传统钻孔灌注桩施工技术具有一定的局限性,难以满足施工要求。对此,结合永和门立交桥工程实况,分析全套管钻机拔桩施工要点及质量控制措施,结果表明:全套管钻机拔桩施工采用钢套管护壁,具有成桩质量好、无泥浆污染、绿色环保等优势,立交桥梁拆除改造工程采用该施工技术及质量控制措施,可有效解决城市高填方、塌孔、缩颈、充盈系数高等问题,值得大范围推广应用。

The interchange bridge demolition and reconstruction project is complex.The traditional bored pile construction technology cannot meet the construction requirements.Combined with the actual situation of Yonghemen interchange bridge project,this paper analyzes the key points and quality control measures of pile pulling with full casing drilling machine.The analysis shows that:with the steel casing wall protection,the pile pulling construction of the full casing drilling machine has the advantages of good pile quality,no mud pollution,and green environmental protection.Therefore,it is worthy of wide application,since it can effectively solve problems such as high fill,hole collapse,necking and high filling coefficient.