A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
VIBRATION REDUCTION STRUCTURE OF MOVABLE BREAKWATER, AND INSTALLATION METHOD OF MOVABLE BREAKWATER
PROBLEM TO BE SOLVED: To provide a vibration reduction structure of a movable breakwater and an installation method of the movable breakwater that enhance durability against fatigue of a movable breakwater of a double steel pipe structure, even when a horizontal load is exerted repeatedly in a horizontal direction, by mitigating impacting force caused by vibration and cluttering at an overlapped portion of the steel pipes.SOLUTION: A movable breakwater includes: a lower steel pipe buried and fixed vertically in a water bottom ground and having an upper stabilizer installed along an inner peripheral surface near a top end; and an upper steel pipe housed in a hollow part of the lower steel pipe in a way that allows emergence from a top end surface of the lower steel pipe, and having a stopper installed along an outer peripheral surface and capable of coming in contact with the upper stabilizer, as well as an upper annular stiffener installed on an inner peripheral surface at a height position facing the stopper. A downwardly tapered surface is provided on an inner surface of the upper stabilizer, the downwardly tapered surface inclining to come closer to a pipe axis of the lower steel pipe toward the top. An upwardly tapered surface is provided on an outer surface of the stopper, the upwardly tapered surface surface-contacting the downwardly tapered surface.SELECTED DRAWING: Figure 3
【課題】二重鋼管構造の可動式防波堤において、水平方向の繰り返し荷重が作用した際にも、鋼管の重なり部に生じる振動やガタツキに起因する衝撃力を低減して疲労耐久性を向上することの可能な、可動式防波堤の振動低減構造および可動式防波堤の設置方法を提供する。【解決手段】水底地盤中で鉛直状に埋設固定され、上端部近傍に内周面に沿って設置される上部スタビライザが備えられる下部鋼管と、下部鋼管の上端面から出没可能な態様で下部鋼管の中空部に格納され、外周面に沿って設置され上部スタビライザに接触可能なストッパ、および内周面におけるストッパと対向する高さ位置に設置される上部環状補剛材が備えられる上部鋼管と、を備える可動式防波堤において、上部スタビライザの内側面には、上側ほど下部鋼管の管軸に近づくように傾斜する下向きテーパー面が設けられ、ストッパの外側面には、下向きテーパー面に面接触可能な上向きテーパー面が設けられる。【選択図】図３
VIBRATION REDUCTION STRUCTURE OF MOVABLE BREAKWATER, AND INSTALLATION METHOD OF MOVABLE BREAKWATER
PROBLEM TO BE SOLVED: To provide a vibration reduction structure of a movable breakwater and an installation method of the movable breakwater that enhance durability against fatigue of a movable breakwater of a double steel pipe structure, even when a horizontal load is exerted repeatedly in a horizontal direction, by mitigating impacting force caused by vibration and cluttering at an overlapped portion of the steel pipes.SOLUTION: A movable breakwater includes: a lower steel pipe buried and fixed vertically in a water bottom ground and having an upper stabilizer installed along an inner peripheral surface near a top end; and an upper steel pipe housed in a hollow part of the lower steel pipe in a way that allows emergence from a top end surface of the lower steel pipe, and having a stopper installed along an outer peripheral surface and capable of coming in contact with the upper stabilizer, as well as an upper annular stiffener installed on an inner peripheral surface at a height position facing the stopper. A downwardly tapered surface is provided on an inner surface of the upper stabilizer, the downwardly tapered surface inclining to come closer to a pipe axis of the lower steel pipe toward the top. An upwardly tapered surface is provided on an outer surface of the stopper, the upwardly tapered surface surface-contacting the downwardly tapered surface.SELECTED DRAWING: Figure 3
【課題】二重鋼管構造の可動式防波堤において、水平方向の繰り返し荷重が作用した際にも、鋼管の重なり部に生じる振動やガタツキに起因する衝撃力を低減して疲労耐久性を向上することの可能な、可動式防波堤の振動低減構造および可動式防波堤の設置方法を提供する。【解決手段】水底地盤中で鉛直状に埋設固定され、上端部近傍に内周面に沿って設置される上部スタビライザが備えられる下部鋼管と、下部鋼管の上端面から出没可能な態様で下部鋼管の中空部に格納され、外周面に沿って設置され上部スタビライザに接触可能なストッパ、および内周面におけるストッパと対向する高さ位置に設置される上部環状補剛材が備えられる上部鋼管と、を備える可動式防波堤において、上部スタビライザの内側面には、上側ほど下部鋼管の管軸に近づくように傾斜する下向きテーパー面が設けられ、ストッパの外側面には、下向きテーパー面に面接触可能な上向きテーパー面が設けられる。【選択図】図３
VIBRATION REDUCTION STRUCTURE OF MOVABLE BREAKWATER, AND INSTALLATION METHOD OF MOVABLE BREAKWATER
可動式防波堤の振動低減構造および可動式防波堤の設置方法
KOBAYASHI MAKOTO (author) / OKAWA DAIICHI (author) / INOUE HIROSHI (author) / KIHARA KAZUYOSHI (author)
2017-09-21
Patent
Electronic Resource
Japanese
IPC:
E02B
HYDRAULIC ENGINEERING
,
Wasserbau