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某单线铁路桥处于山谷河流。通常两岸成浅滩,枯水期水面宽60余米,洪水时则漫滩。河床复盖层厚约6m,其基岩为炭质千枚岩和闪长岩,承载力较高。本桥在水库区,待水库建成后,桥位处水深一般约为50m,建库淤积后百年一遇的水深达65m。根据水文、地质及线路等要求,采用如图1所示的桥式,即自北岸至南岸为2孔64m下承式简支栓焊桁梁加一联3×80m下承式连续栓焊桁梁,再加3孔23.8m预应力钢筋混凝土梁;两侧各设宽1m的人行道。桥上有2‰坡度及一段缓和曲线。全桥共9个墩台,其中2、3、4号墩为薄壁空心高墩,由基础顶面算至墩顶,它们的高度分别为59.4m、72.436m、67.846m。
A single railway bridge in the valley river. Usually the two sides into shoals, dry season, the water is 60 meters wide, flood floodplain. Bed cover thickness of about 6m, the bedrock carbonaceous phyllite and diorite, bearing capacity higher. The bridge in the reservoir area, pending the completion of the reservoir, the bridge at the water depth is generally about 50m, reservoir siltation once a century the depth of 65m. According to the requirements of hydrology, geology and routes, the bridge shown in Figure 1 is adopted, that is, a 2-hole 64m under-supporting simple-supported welded girder and a 3 × 80m under-bolted continuous welded gusset are installed from north to south. Plus 3 holes 23.8m prestressed reinforced concrete beam; two side wide 1m wide sidewalks. Bridge has 2 ‰ slope and a gentle curve. The bridge consists of 9 piers, of which 2, 3, 4 pier are thin-walled hollow high pier, calculated from the top of the foundation to the top of the pier, and their heights are 59.4m, 72.436m and 67.846m respectively.