高屏大橋地形沖淤變動對斷橋之影響

A Collapsed Bridge Affected by Deposition and Erosion on Kaoping River

黃進坤(CHIN-KUN HUANG)

《台灣水利》 49卷1期 (2001/03) Pp. 73-80

https://doi.org/10.6937/TWC.200103_49(1).0008

摘要

本文經由現場調查高屏大橋附近，受碧利斯颱風影響的地形、流場及保護工之資料，以探討此橋的沉陷斷裂因素。依資料分析得知，對橋墩破壞因素包含有過去河床下降的遠因，以及水流作用及蛇籠鐵絲自然生鏽的近因。水流作用有：橋頭側向水流漩渦、水流上舉力、下游水躍、跌水沖刷。另外由於橋墩遮蔽效應，使得側向水流及橋墩正下游處產生淤積，此對保護工安定有正面的效果。

關鍵字

橋墩損壞 ； 沖刷 ； 淤積

並列摘要

The paper investigates the effects of the topography, flow and revetment broken on Kaoping-bridge by using field survey data. Two causes are considered for the collapsed bridge. The remote cause was the gradually degrading bed of Kaoping river under over-mining. The immediate cause was the broken revetment due to impact of flow. It is concluded that there are two effects owing to Typhoon Bilis: scouring and deposition in this bridge. The primary factors causing the scouring include whirlpools at top of bridge, lift force, hydraulic jump, drop flow and rusted revetment. These factors will make the bridge dangerous. As for the deposition, the primary factors which causing it are effects of lateral flow and bridge screen.

並列關鍵字

Bridge collapse ； Scouring ； Deposition