提高钻孔灌注桩质量常州三建建设有限公司307项目部二〇一二年十月-1-目录一、工程概况····························································································2二、小组概况······························································································3三、选题理由······························································································4四、现状调查······························································································4五、课题活动目标······················································································5六、要因分析······························································································5七、制定对策······························································································7八、对策实施······························································································7九、第二次PDCA循环··············································································8十、QC活动实施效果··············································································12十一、巩固措施························································································12十二、存在问题和今后打算····································································12十三、体会·····························································································13-2-提高钻孔灌注桩质量一、工程概况钻孔灌注桩是采用钻机钻孔水下灌注混凝土成桩的一种桩基施工工艺。它采用冲击钻、旋挖钻等钻机钻孔，钻孔深度达到设计标高后进行清孔，根据混凝土与水的比重不同，利用导管灌注水下混凝土成桩。由于灌注桩支护比土钉墙支护安全可靠，而且承载力也较大，在我国基础设施建设中得到非常广泛应用。荷花池街道综合服务中心工程位于常州市钟楼区港龙尚城北侧，西新桥二村农贸市场东侧，主体结构为2~6层的办公楼，地下车库为1~1.5层，基础形式为混凝土预制桩，场地平均标高为黄海2.9米，基坑东侧道路标高为3.6米，基坑开挖深度为4.45~6.50米。支护桩桩径为φ800，有效桩长在7.45-15.5米之间；为确保工程质量和工期要求，结合我公司的装备及施工经验，本工程施工拟采用GPS-10（俗称300型）型钻机正循环钻进成孔、清孔、水下砼灌注成桩工艺本基坑±0.00为黄海高程4.20m，场地地坪平均标高2.90m，东侧...
