自成孔预应力锚杆研究与应用  

Behaviors and application of self-drilling pre-stressed anchors

作　　者：谢新宇[1] 朱凯[1] 应宏伟[1] 华锦耀 刘开富[3] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点试验室,浙江杭州310058 [2]华丰建设股份有限公司,浙江宁波315040 [3]浙江理工大学建筑工程学院,浙江杭州310018

出　　处：《岩土工程学报》2010年第S1期327-331,共5页Chinese Journal of Geotechnical Engineering

基　　金："十一五"国家科技支撑计划项目(2008BAJ06B01-4)

摘　　要：自成孔预应力锚杆属于土层锚杆的一种,通过将荷载传递至周围岩土层中而提供拉拔力。结合自成孔钻头及工艺要求,给出了一般施工方法。基于对荷载传递机理的认识,借助于承载体,该施工方法可以推广应用于荷载分散型锚杆的施工。根据3个压力分散型自成孔预应力锚杆的现场原位拉拔试验,表明其极限拉拔力可达800～1000 kN,进而说明自成孔预应力锚杆体系的可靠性,并可在基坑工程中进一步应用。The self-drilling pre-stressed anchor is a type of ground anchors used to transmit an applied tensile load into soil or rock through cement grout.A general construction procedure is described with a special self-drilling bit.Based on the load transfer mechanism,the construction procedure is presented for load-dispersed ground anchors.The in-situ pullout tests are carried out for three load-dispersed compression type self-drilling pre-stressed anchors.The test results show that the ultimate pullout capacity can reach 800~1000 kN.It demonstrates that this anchor support system is suitable and economical for excavation engineering.

关 键 词：锚杆 自成孔 钻头 承载体 拉拔试验 

分 类 号：TU476[建筑科学—结构工程]