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1 工程概况 某大桥主桥为三跨变截面预应力混凝土连续箱梁,配跨为62+95+62米,桥宽24.5米,为双幅桥,采用分段悬臂现浇施工。桥位处水深流急,主河槽常水位平均水深26米。由于常年冲刷,主河槽深水区河床几无覆盖层,大多为光板裸露基岩,特别是主河槽靠近南岸山体斜坡处,基岩面陡峭倾斜,岩面高差大,并有大块滚石。恶劣的水文地质条件,给大桥下部结构的设计和施工带来极大困
Project Overview The main bridge of a bridge is a three-span prestressed concrete continuous box girder with a span of 62 + 95 + 62 meters and a bridge width of 24.5 meters, and is a double-deck bridge with segmental cantilever cast-in-place construction. Bridge at the water depth of emergency, the main river water level average depth of 26 meters. As a result of perennial erosion, there are few covered beds in the main channel deep water. Most of the bedrock bare basement rock, especially the main channel close to the southern slope of the mountain, the bedrock surface steep slope, large rock surface elevation, and a large rock. The harsh hydrogeological conditions have brought great difficulties to the design and construction of the substructure of the bridge