A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
STEEL PIPE SCREW JOINT
To provide a steel pipe screw joint that is easy to process, can suppress increase of processing cost, allows weight saving of a steel pipe by reducing its thickness and making its strength higher, can improve workability and fitness, and can keep bending strength of the steel pipe equally or more than that of a conventional product.SOLUTION: There is provided a steel pipe screw joint that has a pin 2 where a male thread 2A is formed at an outer surface of one steel pipe and a box 3 where a female thread 3A screwable on the male thread 2A of the pin 2 is formed at an inner surface of the other steel pipe. There is also provided the steel pipe screw joint where a screw train of the pin 2 and the box 3 is tapered against a tube axis, and screws of the box 3 and the pin 2 are configured that at least the compression side flank angle relative to the surface orthogonal to the tube axes of the compression flank surfaces 20c, 30c among compression flank surfaces 20c, 30c bearing a compression load and tension flank surfaces 20d, 30d bearing the tension load, when coupling the pin 2 and the box 3, is set by negative angle inclined to the minus side.SELECTED DRAWING: Figure 3
【課題】加工が容易で、加工コストの増大を抑制でき、薄肉、高強度化することで鋼管の軽量化を図ることができ、施工性と嵌合性を向上させることができるうえ、鋼管の曲げ強度を従来品と同等以上に保つことができる。【解決手段】一方の鋼管の外面に雄ねじ２Ａが形成されたピン２と、他方の鋼管の内面にピン２の雄ねじ２Ａに螺合可能な雌ねじ３Ａが形成されたボックス３と、を有し、ピン２とボックス３のねじ列は、管軸に対してテーパーが形成され、ボックス３及びピン２のねじは、ピン２とボックス３の締結時において圧縮荷重を負担する圧縮フランク面２０ｃ、３０ｃと、引張荷重を負担する引張フランク面２０ｄ、３０ｄとのうち、少なくとも圧縮フランク面２０ｃ、３０ｃの管軸に直角な面に対する圧縮側フランク角がマイナス側に傾斜する負角で設定された構成の鋼管ねじ継手を提供する。【選択図】図３
STEEL PIPE SCREW JOINT
To provide a steel pipe screw joint that is easy to process, can suppress increase of processing cost, allows weight saving of a steel pipe by reducing its thickness and making its strength higher, can improve workability and fitness, and can keep bending strength of the steel pipe equally or more than that of a conventional product.SOLUTION: There is provided a steel pipe screw joint that has a pin 2 where a male thread 2A is formed at an outer surface of one steel pipe and a box 3 where a female thread 3A screwable on the male thread 2A of the pin 2 is formed at an inner surface of the other steel pipe. There is also provided the steel pipe screw joint where a screw train of the pin 2 and the box 3 is tapered against a tube axis, and screws of the box 3 and the pin 2 are configured that at least the compression side flank angle relative to the surface orthogonal to the tube axes of the compression flank surfaces 20c, 30c among compression flank surfaces 20c, 30c bearing a compression load and tension flank surfaces 20d, 30d bearing the tension load, when coupling the pin 2 and the box 3, is set by negative angle inclined to the minus side.SELECTED DRAWING: Figure 3
【課題】加工が容易で、加工コストの増大を抑制でき、薄肉、高強度化することで鋼管の軽量化を図ることができ、施工性と嵌合性を向上させることができるうえ、鋼管の曲げ強度を従来品と同等以上に保つことができる。【解決手段】一方の鋼管の外面に雄ねじ２Ａが形成されたピン２と、他方の鋼管の内面にピン２の雄ねじ２Ａに螺合可能な雌ねじ３Ａが形成されたボックス３と、を有し、ピン２とボックス３のねじ列は、管軸に対してテーパーが形成され、ボックス３及びピン２のねじは、ピン２とボックス３の締結時において圧縮荷重を負担する圧縮フランク面２０ｃ、３０ｃと、引張荷重を負担する引張フランク面２０ｄ、３０ｄとのうち、少なくとも圧縮フランク面２０ｃ、３０ｃの管軸に直角な面に対する圧縮側フランク角がマイナス側に傾斜する負角で設定された構成の鋼管ねじ継手を提供する。【選択図】図３
STEEL PIPE SCREW JOINT
鋼管ねじ継手
AGATA ATSUSHI (author) / INA MASAKI (author) / MYONAKA SHINJI (author) / TSURU EIJI (author)
2021-03-11
Patent
Electronic Resource
Japanese
STEEL PIPE SCREW JOINT AND MANUFACTURING METHOD OF STEEL PIPE SCREW JOINT
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