徐州市三环东路高架快速路建设工程二标桥梁桩基施工方案编制人：审核人：审批人：.2012年5月目录一、编制依据..............................................5二、工程概况..............................................5三、施工条件..............................................63.1、地形、地貌.........................................63.2、地质条件...........................................63.3自然地理情况.........................................73.3.1水文.............................................73.3.2气候、气象.......................................73.3.3地下管线情况.....................................8四、施工方法..............................................84.1人工挖孔桩施工方法...................................84.1.1工艺原理.........................................84.1.2作业特点.........................................84.1.3机具设备.........................................94.2人工挖孔桩施工工艺...................................94.3护壁模板............................................114.4人工挖孔施工方法....................................114.5爆破施工方法........................................144.6终孔检查............................................194.7砼灌注..............................................204.7.1导管法灌注混凝土................................204.7.2串桶灌注混凝土..................................204.8挖孔注意事项........................................214.9质量要求............................................22五．钻（冲）孔灌注桩施工方法.............................235.1钻孔桩施工工艺流程..................................235.2钻孔灌注桩施工方法..................................245.2.1场地准备........................................245.2.2桩位放样........................................245.2.3埋设护筒........................................245.2.4安装钻机........................................245.2.5泥浆池开挖......................................255.2.6泥浆的制备及循环净化............................265.2.7钻孔施工........................................265.2.8成孔检查........................................275.2.9第一次清孔......................................285.2.10钢筋笼加工及吊放...............................285.2.11第二次清孔.....................................305.2.12灌注水下混凝土.................................305.2.13成桩检测.......................................315.3质量控制措施........................................315.3.1冲击钻孔桩钢筋骨架的允许偏差和检验方法..........315.3.2冲击钻孔灌注桩成孔质量允许偏差和检验方法........32六．冲击钻孔桩施工常见事故的预防及处理...................326.1坍孔................................................326.1.1坍孔原因........................................326.1.2坍孔的预防和处理................................336.2冲击成孔偏斜........................................336.2.1偏斜原因........................................336.2.2预防和处理......................................346.3掉钻头..............................................346.3.1掉钻头原因......................................346.3.2预防措施........................................346.3.3处理方法........................................346.4扩孔和缩孔..........................................346.5.1漏浆原因........................................356.6首批混凝土封底失败..................................356.6.1事故原因:..............................
