DIRECTIONAL BORING CFT SOIL-NAILING STRUCTURE USING TUBE HAVING HOLLOW PORTION

摘要

Provided is a directional boring concrete-filled tube (CFT) soil-nailing structure using a tube having a hollow portion. To form the structure, a pipe-shaped tube having a hollow portion is used as a soil nail capable of functioning as a tension member and a grout injection passage at the same time. Accordingly, the number of members is reduced when compared with existing techniques, the structure simplified, and handling and construction thereof efficient and economically feasible. The hollow portion of the tube is filled with grout mortar after grouting to a drilled hole is complete, and the CFT becomes a compound structure after the grout is hardened. As a result, ductility of the tube is highly increased, and a supporting force as soil nail against tensile force is greatly increased. Moreover, if a hammer-type rotary drilling pipe having a drill bit is attached to a back end portion of the tube, the tube may be used for horizontal directional drilling.;COPYRIGHT KIPO 2017