THE STUDY ON JOINT METHOD OF STEEL PIPE BY USING EXPANSIVE MORTAR

1998 Fiscal Year Final Research Report Summary

• Project/Area Number: 08555110
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 展開研究
• Research Field: 土木材料・力学一般
• Research Institution: KYUSHU INSTITUTE OF TECHNOLOGY
• Principal Investigator: IDEMITU Takashi KYUSHU INSTITUTE OF TECHNOLOGY, CIVIL ENGINEERING, PROFESSOR, 工学部, 教授 (30039078)
• Co-Investigator(Kenkyū-buntansha): SOEDA Kouiti TITIBUNONODA CORPORATION, INSTITUTE F CEMENT ; KIYONAGA Sadamitu HIGASIDA DEVELOPMENT CORPORATION, 常務取締役 ; WATANABE Akira KYUSHU KYOURITU UNIVERSITY, CIVIL ENGINEERING, PROFESSOR, 工学部, 教授 (90039066) ; YAMASAKI Takehiro KYUSHU INSTITUTE OF TECHNOLOGY, CIVIL ENGINEERING, PROFESSOR, 工学部, 助教授 (10098783) ; KAKIZAKI Minoru NIPPON STEEL SORPORATION
• Project Period (FY): 1996 – 1998
• Keywords: JOINT / STEEL PIPE / EXPANSIVE MORTAR / TOUGHNESS / 耐震型 / 無溶接継手

Research Abstract

An end part of a steel pipe is enlarged in the manufacturing process and, at in-site, normal end part of other steel pipe is inserted into the enlarged one. In short, double pipe part acting as a kind of joint is formed. Then, the portion of the double pipe part is swelled by using wedge type apparatus newly developed. To make the swelling portion is the characteristics of the joint method newly developed in this study.
The push out test of the joint was carried out with three types of joint specimens whose height of swelling part are varied as 5mm, 10mm and 15mm. As a result, bearing capacity of those specimens were 100kN, 200kN and 300kN respectively, moreover it was made clear that they bad very high toughness.
The other type of joint can be obtained by pouring the expansive mortar into the void of swelling part. Sufficient frictional force and watertight could be obtained by the expansive pressure of the mortar.
It can be said that the further excellent joint could be developed by using both types of jointing method mentioned above.