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1．项目概况坝陵河大桥位于贵州关岭县境内,是沪瑞国道主干线贵州省镇宁至胜境关公路上跨越坝陵河大峡谷的一座特大型桥梁,距黄果树风景区约7km。坝陵河峡谷两岸地势陡峭,地形变化急剧,起伏大,河谷深切达400-600m,桥面距谷底约370m。受地形条件和技术水平的制约,我国西部地区跨越山区峡谷的公路桥梁,中等跨径的公路桥梁以拱桥和连续刚构桥为主,拱桥和连续刚构桥的设计、研究和施工技术水平相对成熟,跨度稍大的公路桥梁,以斜拉桥居多,悬索桥方案较少。经设计阶段的多种桥型方案的综合论证,坝陵河大桥主桥采用主跨1088m的单跨钢桁架悬索桥,引桥采用50m预应力混凝土连续刚构,东岸引桥长940．4m,西岸引桥长200m,全桥总长2137m。全桥浇筑混凝上约25万m2,使用各类钢材约6．5万t。大桥于2005年4月18日开工,计划于2008年8月完工。2．技术标准(1)道路等级：双向四车道高速公路。(2)计算行车速度：80km／h。(3)桥梁宽度：24．5m,其中,中央分隔带宽度为1．50m,左侧路缘带宽度为2×0．50m,行车道宽度为2×(2×3．75)m,紧急停车带宽度为2×3．00m,外侧防撞护栏宽度为2×0．50m。(4)桥梁设计荷载：汽车-超20级,挂车-120。(5)地震基本烈度6度,大桥按7度设防。
1. Project Overview Baling River Bridge is located in the territory of Guizhou Guanling County, is the main road of Shanghai-Rui National Road, Zhenning, Guizhou Province to Jing-Sheng Highway across the Balinghe Grand Canyon a large bridge from the scenic Huangguoshu about 7km. The terrain is steep in both sides of the Balinghe Canyon. The terrain changes sharply and undulating. The valley reaches 400-600m deep and the bridge deck is about 370m away from the bottom of the valley. Constrained by the topographic conditions and technical level, the road bridges across the mountain gorges in the western region of China are mainly composed of arch bridges and continuous rigid frame bridges, and the design, research and construction technology of arch bridges and continuous rigid frame bridges are relatively Mature, slightly larger span of the bridge to cable-stayed bridge mostly, less suspension bridge program. Based on the comprehensive demonstration of various bridge schemes in the design stage, the main bridge of Balinghe River Bridge adopts single-span steel truss suspension bridge with main span of 1088m. The approach bridge adopts 50m prestressed concrete continuous rigid frame structure, the east coast approach bridge is 940.4m long, Length 200m, full bridge length 2137m. Full-bridge pouring coagulation on the about 250,000 m2, the use of various types of steel about 65,000 t. The bridge started on April 18, 2005 and is scheduled to be completed in August 2008. 2. Technical standards (1) Road level: two-way four-lane highway. (2) Calculation of driving speed: 80km / h. (3) The width of the bridge: 24.5m, of which the width of the central divider is 1.50m, the width of the left margin is 2 × 0.50m, the width of the lane is 2 × (2 × 3.75) m, and the emergency Parking width of 2 × 3.00m, the width of the outer crash barrier 2 × 0.50m. (4) Bridge design load: car - super 20, trailer -120. (5) The basic intensity of the earthquake is 6 degrees, and the bridge is fortified at 7 degrees.