公开(公告)号：US20190153692A1

公开(公告)日：2019-05-23

申请号：US16097929

申请日：2017-08-10

Applicant: KOREA INSTITUTE OF CIVIL ENGINEERING AND BUILDING TECHNOLOGY

Inventor： Jin Tae HAN ,  Young Eun JANG

IPC: E02D5/48 ,  E02D5/56 ,  E02D5/80 ,  E02D5/54 ,  E02D3/12

Abstract: The present invention provides a wave-shaped grouting bulb (100) for securing an underground bearing capacity of a steel bar (10), the bulb comprising a plurality of protrusions (120), which have a predetermined maximum diameter (D1) and are formed along the longitudinal direction of a cylindrical pillar part (110) extending downward, wherein the neighboring protrusions (120) are formed to be spaced from each other by a predetermined formation distance (s). The present invention has an advantageous effect of improving a skin friction force and resistance to compression and pullout in the grouting bulb integrated with the steel bar and thus enhancing structural stability in the micropile body.