公开(公告)号：US20180016787A1

公开(公告)日：2018-01-18

申请号：US15371171

申请日：2016-12-06

Applicant: KOREA INSTITUTE OF CIVIL ENGINEERING AND BUILDING TECHNOLOGY

Inventor： HEUNG YOUL KIM ,  BUM YEON CHO

IPC: E04C3/34 ,  E04C3/36 ,  E04C3/32 ,  E04B1/94

CPC classification number: E04C3/34 ,  E04B1/943 ,  E04C3/32 ,  E04C3/36 ,  Y10T29/49631

Abstract: In the disclosure, the CFT column includes external steel tubes including straight jointing portions in which inclined bolt grooves are formed to be vertically apart from each other and which are formed to extend from an end thereof to cover an overall extension length thereof, a straight bolt connection slot including straight plates connected by a connection bolt to be apart from each other and formed to extend, and configured to integrate the external steel tubes by allowing the connection bolt to be inserted into each of the inclined bolt grooves in which the straight jointing portions of the external steel tubes are in contact with each other and communicate with each other, concrete placed in the integrated external steel tubes and cured, and a wave-shaped punching steel plate.