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江垭水库坝下大桥是水库枢纽对外交通的“咽喉”,不论在工程建设期或运行期都是至关重要的附属建筑物。大桥距大坝约700m,全长131.8m,是一座单孔主跨为76m的双曲拱桥。大桥按汽—20′,挂—100′标准设计,并以最大运输设备重144′校核。桥面宽12.5m,其中行车道9m,两边人行道及栏杆各1.75m。全桥跨河段荷载由5片箱型钢筋砼主拱肋组成的拱圈承担。每片主拱肋分3段进行预制、拼装,单件最大吊重27′。坝下桥施工的关键在于主拱肋的预制、运输和吊装,为此,我们在施工中着重抓了这一工作。主拱肋吊装从1993年9月3日
The dam of Jiangya Reservoir is the “throat” of the external traffic of the reservoir hub, which is an important ancillary building both during the project construction and operation periods. The bridge is about 700m away from the dam and has a total length of 131.8m. It is a double-curved arch bridge with a single-hole main span of 76m. Bridge by steam -20 ’, hang -100’ standard design, and the largest transport equipment weight 144 ’check. The bridge deck is 12.5m wide, of which the carriageway is 9m and the sidewalks and railings are 1.75m on both sides. Full bridge across the river load by the five box-shaped steel arch rib consisting of the arch circle bear. Each piece of main arch rib is prefabricated and assembled in 3 sections, and the maximum lifting capacity of single piece is 27 ’. Dam under the bridge construction is the key prefabricated arch, transportation and hoisting, therefore, we focused on the construction of this work. The main arch hoisting from September 3, 1993