STUDY ON THE METHOD TO STRENGTHEN ANCHORING FORCE OF ANCHORAGE BAR

Though 76 pull-out type tests for anchorage bars in 15 projects in Dalian area,it is recognized that the anchoring force is affected by multiple factors.The major factors are the drilling techniques and quality of poured mortar. To strengthern the anchoring force of anchorage bar,the author suggests to use air drilling technique for weathered rocks or soil.And for medium and weakly weathered rocks,the drilling holes should also be washed with clean water.Expansive mortar is suggested to pour the anchorage bars.The stress of steel should be measured during the pull-out type tests for anchorage bars.