地下暗河场地全套管旋挖钻孔机成孔灌注桩施工技术  

Construction Technology of Subsurface Stream Site with Full Set of Tube Rotary Borehole Pile Forming

作　　者：李镇麟 LI Zhenlin(China Railway Tianfeng Construction Engineering Co.,Ltd.,Beijing 102308,China)

机构地区：[1]中铁天丰建筑工程有限公司,北京102308

出　　处：《建筑施工》2023年第7期1299-1301,1317,共4页Building Construction

摘　　要：针对地下暗河场地条件下,旋挖钻孔灌注桩易坍孔的施工难题,依托实际施工案例,提出全跟进双壁套管和永久钢护筒相结合的成孔方式,形成内外双套管的模式进行钻孔桩施工作业。该方案极大地克服了地下暗河场地的复杂施工条件的施工困难,提高了旋挖灌注桩的一次成孔率,不仅提高了桩身质量,而且缩短了施工时间,取得了良好的效益,为地下暗河场地的桩基施工积累了经验。Aiming at the construction dificulties of rotary bored piles which are prone to collapse under the conditions of subsurface stream site,based on the actual construction cases,the combination of full follow-up double-walled casing and permanent steel casing to form the mode of internal and external double casing for bored pile construction operation is proposed.The scheme greatly overcomes the construction difficulties of the complex construction conditions of the subsurface stream site,improves the one-time completion rate of the rotary bored pile,not only improves the pile quality,but also shortens the construction time,achieves good benefits,and accumulates experience for the construction of pile foundations inthe subsurfacestream site.

关 键 词：旋挖钻孔灌注桩 地下暗河 坍孔 双壁套管 钢护筒 

分 类 号：TU753[建筑科学—建筑技术科学]