基坑沙石垫层回填方案

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1、青岛一建集团有限公司施工组织设计1818工程208号房基坑砂石换填施工方案批准：审核：编制：青岛一建集团有限公司二Ｏ一一年十二月5目录一、编制依据·······························································································································2二、工程概况·························································

2、······································································2三、施工准备·······························································································································2四、施工方法·····················································

3、··········································································2五、质量标准·····························································································································2六、成品保护···················································

4、·············································································3七、安全保证措施·····················································································································3八、环境保证措施····················································

5、·································································35一、编制依据1、海军北海设计院结构施工图纸2、国家、行业现行有关技术规范、规程及标准。二、工程概况本工程位于青岛市，为3层建筑物，局部4，5层，层高3.3米，建筑物±0.000同原有建筑物±0.000。1818工程208号房工程为住宅项目。由海军北海设计院设计，海军北海工程设计院工程监理部第八项目监理部监理，青岛一建集团有限公司施工。工程自2011年12月8日开工（以开工报告为准），竣工日期

6、为2011年4月30日，总日历工期150天。工程总建筑面积3630.85m2（其中原有建筑面积1001.54㎡，新建建筑面积2629.31㎡5）。工程质量要求达到合格，合同总投资额约为456万元。1.2建筑和结构特征：三、施工准备1、技术准备：（1）施工前已组织相关单位共同验槽。（2）施工前对操作工人进行详细的技术交底。2、材料准备：级配良好的砂石，石子最大粒径不宜大于100mm，不含植物残体、垃圾等杂质，含泥量不宜超过3%。3、机具准备：大挖掘机、压路机、手推车、铁锹、潜水泵、自吸泵、工程线、钢卷尺、水准仪等。四、施工方

7、法1、工艺流程：检查砂石质量——准备施工机具——基层清理——设置高程——分层铺筑砂石——碾压——找平验收2、操作工艺：（1）基地设计标高为-4.4米，在标高-4.4米至-3.9米回填500mm厚度粒径不大于100mm的纯石子;500mm厚度石子分两次摊平碾压至设计要求强度值(不低于150KPA,压实系数不低于0.94).（2）在标高-3.9米至-1.9米换填沙石垫层，每300mm一道，每层用压路机碾压，沙石级配中石子比例不大于30%，石子粒径不大于100mm，压实系数不小于0.94。5五、质量标准1、表面不应有沙窝、石堆等

8、质量缺陷。2、砂石垫层的允许偏差应符合下表：砂垫层和砂石垫层表面的允许偏差和检验方法（mm）项次项目允许偏差检查方法1表面平整度15用2m靠尺和楔形塞尺检查2标高±20用水准仪检查3坡度不大于房间相应尺寸的2/1000，且不宜大于30用坡度尺检查4厚度在个别地方不大于设计厚度的1/10用钢尺检查六、成品