钻孔桩作业指导书.doc

目录冲击钻灌注桩作业指导书························································ -1- 1 、目的·········································································· -1- 2 、编制依据···································································· -1- 3、适用范围···································································· -1- 4 、施工方法及工艺要求····················································· -1- 5 、钻孔·········································································· -2- 6 、钢筋笼制作、安装························································ -3- 7 、砼灌注······································································· -5- 8 、质量验收标准······························································ -5- 回旋钻灌注桩作业指导书························································ -9- 1 、目的·········································································· -9- 2 、编制依据···································································· -9- 3、适用范围···································································· -9- 4 、施工方法及工艺要求··················································· - 10- 旋挖钻灌注桩作业指导书······················································ - 13- 1 、目的········································································ - 13- 2 、编制依据·································································· - 13- 3、适用范围·································································· - 13- 4 、施工方法及工艺要求··················································· - 13- 钻孔桩常见事故的预防及处理。············································· - 17- -1- 冲击钻灌注桩作业指导书 1 、目的明确桥梁桩基冲击钻施工作业的工艺流程、操作要点和相应的工艺标准,指导、规范桩基作业施工。 2 、编制依据《客运专线铁路桥涵工程施工质量验收暂行标准》《客运专线铁路桥涵工程施工技术指南》《施工图设计文件》 3、适用范围适用于卵石、坚硬漂石、岩层及各种复杂地质的桥梁桩基施工。 4 、施工方法及工艺要求要求采用整套冲击钻机设备,避免使用双筒卷扬机组成的简易钻具。为防止冲击振动导致邻孔孔壁坍塌或影响邻孔已浇灌砼强度, 应侍邻孔砼抗压强度达到 后方可开钻。 施工准备钻孔场地应清除杂物、换除软土、平整压实。场地位于浅水、陡坡、淤泥中时,可采用筑岛、或用枕木或型钢等搭设工作平台;当位于深水时,可插打临时桩搭设固定工作平台。工作平台必须坚固稳定,能承受施工作业时所有静、活荷载,同时还应考虑施工设备能安全进、出场。 埋设钢护筒护筒内径比桩径大 20~ 40cm ,护筒埋置深度符合下列规定:黏性土不-2- 小于 1m, 砂类土不小于 2m。当表层土松软时将护筒埋