预应力旋喷搅拌锚桩在基坑支护工程中的应用

Application of prestressed rotary jet mixing pile to foundation pit supporting

从钻进成孔搅拌、提钻杆复喷、张拉锚索3个层面,描述了某基坑支护工程预应力旋喷搅拌锚桩技术,并通过基坑坡顶水平位移和坡顶沉降监测,结果说明,自钻式预应力旋喷搅拌锚桩加冲钻孔灌注围护桩的基坑支护形式,具有基坑开挖施工便捷、基坑边位移小和总体造价低等优点,在周边场地允许的情况下,对于大跨度深基坑支护有很好的适用性和经济性。

Prestressed rotary jet mixing pile anchoring technology was described, including bored mixing, pile-pulling re-jetting and string pulling. Foundation pit was monitored via slope top lateral displacement and slope top settlement. The results show that the foundation pit supporting that com- bines self-boring type prestressed jet mixing anchor pile and punched fender pile has the advantages of convenient construction, small displacement of foundation side and low general cost. It is indica- ted that provided the surrounding conditions are suitable, the prestressed rotary jet mixing pile an- choring technology is of high adaptability with favourable economical returns for large-span deep foundation pit supporting.