灰土挤密桩处理回填砂土施工难点解决及效果  

Construction Difficulties Solutions and Effect of Treating Backfill Sand by Lime-soil Compaction Pile

作　　者：赵德成[1] 王中荣[1] 李春秀[2] 

机构地区：[1]河北省电力勘测设计研究院,石家庄市050031 [2]河北建设勘察研究院有限公司,石家庄市050031

出　　处：《勘察科学技术》2016年第4期29-31,54,共4页Site Investigation Science and Technology

摘　　要：某变电站地基为新近回填的松散状粉细砂,设计采用灰土挤密桩处理方案,施工采用锤击沉管工艺。在施工之初及过程中出现了塌孔及达不到预定深度等问题,为此,分别增加了夯扩桩管内夯击施工和短螺旋排土成孔夯实工艺。三种方法间隔跳打的联合施工措施,有效地解决了施工难题。经检测,复合地基承载力等各项指标均达到了设计要求。A substation foundation is the newly backfill loose sand. The design uses the treatment scheme by lime-soil compaction pile,and the construction uses the hammering tube technology. In the beginning and through the construction,the problems of collapse and not up to a predetermined depth appear. In order to solve the problems,the ram-expanded pile technology and short screw- feed boring technology are added. The joint construction measures by the three methods by the interval jump to fight can slove the construction problems effectively. Through testing,the composite foundation bearing capacity and other indicators achieve the design requirements.

关 键 词：灰土挤密桩 回填砂土 联合措施 处理效果 

分 类 号：TU753.3[建筑科学—建筑技术科学]