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標題: 不同規格環圈柱於橋墩沖刷保護效果之研究
Pier Scour Protection with Various Specifications of Ring Columns
作者: C.Y. Wang
Y.S. Chang
C.L. Chang
J.H. Yang
M .H. Yang
H.P Shih
關鍵字: 環圈柱;局部沖刷;沖刷深度;Ring columns;Local scour;Scour depth
Project: 水土保持學報, Volume 45, Issue 1, Page(s) 437-456.
In the west of Taiwan, bed elevations of many rivers lowered down seriously. River and bridge management bureaus often construct bridge protection works around piers to reduce the scouring of the pier foundations. However, the results are still unsatisfactory. In this study, the use of ring columns as a pier protection countermeasure is reported. The ring columns consisting of cylindrical rubber rings are placed upstream of a bridge pier to reduce the flow impacting energy and scour by its’ irregular surface roughness and porous characteristics. A series of experiment was conducted with uniform sediments under the clear-water steady flow (V/Vc<1) conditions. By changing the ring specifications, and distances between ring columns and the pier in order to understand the scour depth reduction effect and propose an optimal allocation of protection works.
The results show that, when the ring specifications and the ring columns to set the distance change, the range of influence on the flow generated will be changed, resulting in different energy dissipation. In general, when the ring presents Type III (DR=0.28/b) with the diameter D/b=0.8, ring columns protection appear the best protection effect at the distance L/b=4, and pier scour depth reduction rate by 30.3%.

研究結果顯示,當環圈規格與環圈柱設置距離改變時,保護工對水流產生的影響範圍會隨之化,造成不同的消能效果。整體而言,當環圈規格為III 型(DR/b=0.28)組成之直徑D/b=0.8,環圈柱保護工設置距離以L/b=4 之保護效果為最佳,沖刷減緩率為30.3%。
Appears in Collections:第45卷 第01期

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