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STEEL PIPE CONNECTION STRUCTURE AND STEEL PIPE MANUFACTURING METHOD FOR STEEL PIPE JOINT
To enable cost reduction while securing structure performance of a joint member in a steel pipe connection structure.SOLUTION: The steel pipe connection structure for connecting first and second steel pipes in an axial direction comprises: an inner fitting member joined to the first steel pipe; and an outer fitting member joined to the second steel pipe. The inner fitting member includes a first fitting part that fits inside the outer fitting member. The outer fitting member includes a second fitting part that fits outside the inner fitting part. The first and second fitting parts have axial stopper structures. The inner and outer fitting members are formed by bend roll pipes in which welding parts extend in the axial direction of the steel pipes. At least one of a yield point and 0.2% yield strength of a steel material forming each bend roll pipe is 215 MPa or more and 550 MPa or less, and tensile strength is 400 MPa or more and 720 MPa or less. A peripheral width of the bend roll pipe of a molten solidified part of the welding part is larger than 1 mm over the whole thickness in a radial direction.SELECTED DRAWING: Figure 1
【課題】鋼管の連結構造において、継手部材の構造性能を確保しながら低コスト化を可能にする。【解決手段】第１および第２の鋼管を軸方向に連結する鋼管の連結構造は、第１の鋼管に接合される内嵌部材と、第２の鋼管に接合される外嵌部材とを備える。内嵌部材は、外嵌部材の内側に嵌合する第１の嵌合部を含み、外嵌部材は、内嵌部材の外側に嵌合する第２の嵌合部を含み、第１および第２の嵌合部は、軸方向についての抜け止め構造を有し、内嵌部材および外嵌部材は、溶接部が鋼管の軸方向に延びるベンドロール管で形成され、ベンドロール管を形成する鋼材の降伏点または０．２％耐力の少なくとも一方が２１５ＭＰａ以上５５０ＭＰａ以下、引張強さが４００ＭＰａ以上７２０ＭＰａ以下であり、溶接部における溶融凝固部のベンドロール管の周方向における幅は、径方向の全厚にわたり１ｍｍよりも大きい。【選択図】図１
STEEL PIPE CONNECTION STRUCTURE AND STEEL PIPE MANUFACTURING METHOD FOR STEEL PIPE JOINT
To enable cost reduction while securing structure performance of a joint member in a steel pipe connection structure.SOLUTION: The steel pipe connection structure for connecting first and second steel pipes in an axial direction comprises: an inner fitting member joined to the first steel pipe; and an outer fitting member joined to the second steel pipe. The inner fitting member includes a first fitting part that fits inside the outer fitting member. The outer fitting member includes a second fitting part that fits outside the inner fitting part. The first and second fitting parts have axial stopper structures. The inner and outer fitting members are formed by bend roll pipes in which welding parts extend in the axial direction of the steel pipes. At least one of a yield point and 0.2% yield strength of a steel material forming each bend roll pipe is 215 MPa or more and 550 MPa or less, and tensile strength is 400 MPa or more and 720 MPa or less. A peripheral width of the bend roll pipe of a molten solidified part of the welding part is larger than 1 mm over the whole thickness in a radial direction.SELECTED DRAWING: Figure 1
【課題】鋼管の連結構造において、継手部材の構造性能を確保しながら低コスト化を可能にする。【解決手段】第１および第２の鋼管を軸方向に連結する鋼管の連結構造は、第１の鋼管に接合される内嵌部材と、第２の鋼管に接合される外嵌部材とを備える。内嵌部材は、外嵌部材の内側に嵌合する第１の嵌合部を含み、外嵌部材は、内嵌部材の外側に嵌合する第２の嵌合部を含み、第１および第２の嵌合部は、軸方向についての抜け止め構造を有し、内嵌部材および外嵌部材は、溶接部が鋼管の軸方向に延びるベンドロール管で形成され、ベンドロール管を形成する鋼材の降伏点または０．２％耐力の少なくとも一方が２１５ＭＰａ以上５５０ＭＰａ以下、引張強さが４００ＭＰａ以上７２０ＭＰａ以下であり、溶接部における溶融凝固部のベンドロール管の周方向における幅は、径方向の全厚にわたり１ｍｍよりも大きい。【選択図】図１
STEEL PIPE CONNECTION STRUCTURE AND STEEL PIPE MANUFACTURING METHOD FOR STEEL PIPE JOINT
鋼管の連結構造および鋼管継手用の鋼管製造方法
HISAZUMI KAZUMASA (author) / KITAHAMA MASASHI (author) / YANAGI ETSUTAKA (author) / AGATA ATSUSHI (author)
2024-04-15
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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