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題 名 | 環圈柱群於橋墩沖刷防治之研究=Application of Ring Column Groups to Pier Scour Prevention |
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作 者 | 王傳益; 呂其倫; 張詠善; 鄭人豪; | 書刊名 | 農業工程學報 |
卷 期 | 58:4 2012.12[民101.12] |
頁 次 | 頁51-66 |
分類號 | 441.816 |
關鍵詞 | 環圈柱群; 橋墩沖刷深度; 沖刷減緩率; Ring columns groups; Pier scour depth; Scour depth reduction; |
語 文 | 中文(Chinese) |
中文摘要 | 台灣地區夏季由於滯留鋒與颱風的影響常造成豪雨,近年來氣候異常使得氣候 型態更趨於極端,如2009 年莫拉克颱風在台灣降下紀錄性降雨,對台灣所造成的重 大災害更是前所未見。豪雨所形成之高流量沖刷橋墩周圍河床,造成橋墩基礎裸露 進而危及橋梁安全之情況,因此如何避免橋墩遭破壞遂成為當前之重要課題。本研 究基於保護橋基安全,因此研發新型之環圈柱群橋墩保護工,並進行相關水工模型 試驗之研究,提出較理想之保護工配置,期能減緩橋墩沖刷,以供相關單位工程設 計之參考。 本研究利用水工試驗模擬於清水定量流下,不同環圈柱群配置模式對橋墩沖刷 之保護效果。藉由改變環圈柱群與橋墩間之距離及群樁間之夾角等重要幾何與水力 參數,探討該等參數於消減水流動能,降低橋墩沖刷深度之影響。 試驗結果得知,當環圈柱群設置於距離橋墩為6 倍橋墩直徑處及環圈柱群間之 夾角50 度時,橋墩之沖刷減緩率可達55.8%,為本研究試驗條件範圍內最佳設置型式。 |
英文摘要 | Taiwan frequently experiences heavy rainfall due to the stationary front and typhoons during the summer. In recent years, the climatic anomalies tend to be more extreme weather, such as the typhoon Morakot (2009) had record heavy rainfall down on Taiwan caused a major disaster was unprecedented. The heavy rain forms scouring of the river bed around the piers under high-flow, which reduces the land cover of pier and may induces the collapse of bridge. Based on the safety of bridge, the use of ring columns groups as a pier scour countermeasure is reported. In this study, a series of hydraulic model experiments of ring columns groups are carried out for the idea arrangements to reduce bridge scour. It can be served as a reference of design for relevant engineers in future. A series of experiment was conducted with uniform sediment under the clear-water steady flow conditions. Various parameters including angle between the ring columns groups, and distance between the ring columns groups and bridge pier are considered. Laboratory data are used to assess the influence of each parameter on decrease flow energy. The results show that scour depth reduction of the pier can decrease to 55.8% of the original value, which is the best set type on this study experimental conditions, when the ring columns groups settings at distance of 6 times the pier diameter, and between on the ring columns groups of angle is 50 degrees. |
本系統中英文摘要資訊取自各篇刊載內容。