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一、最初来用板桩围堰的情况威远江在枯水季节水深仅为0.71公尺(最高洪水位时,水深达8.13公尺),因此基础施工采用土坝围水,第一期使水集中于第六、七两孔位置排出,第一、二、三、四墩及两个台一齐施工。第二期困坝是在第一、二、三、四墩石砌工程砌出水面以后,又用土坝改围五、六两墩。在大的土坝围堰中,对每个墩基又进行围堰,也就是这里所介绍的基坑围堰。该桥的地质情况是,从河床以下均为砂砾石,5.5—6公尺以下为灰色页岩风化的粘土层,混凝土基块建筑在这层页岩上,所以基础坑的深度一般为5～6公尺。
First, the case of sheet pile cofferdam Weiyuan River in the dry season, the water depth of only 0.71 meters (the highest flood level, the water depth of 8.13 meters), so the foundation construction using earth dam water, the first phase of Water concentrated in the sixth and seventh hole position of discharge, the first, second, third, four pier and two stations together construction. The second phase of the dam is dam after the first, two, three, four stone pier project after the water surface, but also with the earth dam to change five or six pier. In large earth dam cofferdams, cofferdams are also carried out on each pier foundation, that is, the foundation pit cofferdam described here. The geological condition of the bridge is that sand and gravel are formed from below the riverbed and gray shale weathering clay layer below 5.5-6 meters. Concrete blocks are built on this shale, so the depth of the foundation pit is generally 5 ~ 6 meters.