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題名 | 柔性葉片環圈堆保護工應用於橋墩沖刷現地試驗之研究=Study of Field Experiment on Prevention of Bridge-Pier Scouring by Using A Stack of Rings with Soft Blades |
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作者姓名(中文) | 彭大雄; 徐郁超; 詹錢登; | 書刊名 | 臺灣公路工程 |
卷期 | 38:6/7 2012.07[民101.07] |
頁次 | 頁68-86 |
分類號 | 441.816 |
關鍵詞 | 柔性葉片環圈堆; 橋墩; 橋墩保護; A stack of rings with soft blades; Bridge pier; Bridge pier protection; |
語文 | 中文(Chinese) |
中文摘要 | 摘 要 當水流經過橋墩時,在橋墩周圍產生渦流現象,尤其在大洪水時,渦流現象及渦流所造成的 河床沖刷更為明顯,甚至危害橋墩安全。本研究提出以柔性葉片環圈堆保護工法消減渦流促使泥 砂落淤,進而達到保護橋墩之目的。現地試驗在曾文溪曾文二號橋下進行,將柔性葉片環圈堆安 裝在橋墩的四周,觀察洪水流經柔性環圈堆之水理特性及觀察洪水過後橋墩四周之河床沖淤變 化,以檢驗本研究所提出之河川橋墩柔性保護工法之成效。柔性葉片環圈堆保護工於2008 年3 月 底完成安裝,至2008 年底已經歷卡玫基等六場颱風洪水的考驗,而2009 年8 月更經歷過莫拉克 颱風洪水嚴厲之考驗,更顯示此結溝能承受巨大衝擊。因此,現地試驗結果顯示本研究所提出之 柔性葉片環圈堆保護工能有效改善橋墩四周沖刷現象。 |
英文摘要 | Abstract Flow vortexes are generated at the surrounding area of a bridge pier when water passes it. This phenomenon could cause severe erosion at the bottom of a pier and therefore, it is a threat to stability of the pier especially during flood events. This research is aimed to develop a soft device that couldeffectively eliminate or reduce the vortex phenomenon, and then reduce the bed erosion, so as to protect bridge pier. Field investigation of the present research was conducted at the prier #5 of Tsengwen-River Bridge No. 2. The soft device was made of used tires of motor vehicles, attached with soft metal blades/fins one tires’ surface. This device is also named as “a stack of rings with soft blades.” The soft devices were tightly installed around the bride pier. The flow patterns around the bridge pier at flood events were observed, and the variations of river bed around the pier were also observed to check the effectiveness the proposed soft device. The results show that the soft device could effectively reduce the vortex intensity around piers, so as to reduce erosion ability and let some sediments deposit around the bridge pier. The proposed device has been proved having the function of protecting bridge pier against scouring. And the device also passed the serious test of huge flood of Morakot typhoon in the 2009. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。