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嘉绍大桥主航道桥为六塔独柱四索面分幅钢箱梁斜拉桥,主墩承台为圆柱形深埋式承台,直径39.0~40.6m,单个承台混凝土方量约8 000m~3,承台施工难点大、技术复杂。在嘉绍大桥Ⅳ标承台施工实践的基础上,介绍强涌潮水域埋置式承台双壁钢围堰的沉放工艺、水下封底混凝土浇筑工艺、承台大体积混凝土施工及温控措施。
The main waterway bridge of Jiashao Bridge is a six-tower single-column four-cable plane steel box girder cable-stayed bridge. The main pier platform is a cylindrical deep-buried platform with a diameter of 39.0-40.6m and a single platform concrete weight of about 8 000m ~ 3, cap construction difficulties, technical complexity. On the basis of the construction practice of Ⅳ standard platform in Jiashao Bridge, this paper introduces the sinking process of double-wall steel cofferdam of embedded cap platform in strong gully waters, the pouring process of underwater back concrete, the construction of mass concrete in cap and the temperature control measures.