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南宁英华大桥主桥为45+410+45m双塔单主缆悬索桥,主桥钢箱梁宽度为37.7m,总重约9500吨,钢箱梁顺桥向竖曲线复杂,跨中与两端高差接近5m。受现场施工条件、工期等因素影响,在桥址单侧河岸设置钢箱梁总拼场和顶推平台,钢箱梁板单元工厂制造完成后运输至现场总拼成大型整节段,运梁台车转运整节段钢箱梁,提梁机整体提升梁段至顶推平台,采用步履式多点连续顶推施工技术,从河岸一侧向另一侧顶推。顶推设备自身可实现钢梁的横向、纵向、竖向位置调整,顶推过程中利用高度调节装置调节钢箱梁不断变化的标高,实现顶落梁高差近3m。英华大桥钢箱梁整体顶推施工具有顶推跨径大、质量大、重心高、顶推线形控制难度大、落梁高度大等特点,该桥的顺利施工为类似工程提供了借鉴。
The main bridge of Nanning Yinghua Bridge is 45 + 410 + 45m single tower cable suspension bridge with a width of 37.7m and a total weight of about 9500 tons. The vertical curve of steel box girder along the bridge is complex, Close to 5m. Affected by site construction conditions, construction period and other factors, steel box girder total stacking field and jacking platform are set on one bank of the bridge site, and the steel box girder slab unit factory is manufactured and transported to the site to make a large integral section, Trolley transfer of the whole section of steel box girder, beam lifting machine to raise the whole platform to push the platform, using walking multi-point continuous jacking construction technology, pushing from one side of the bank to the other. The pushing device itself can realize the horizontal, vertical and vertical position adjustment of the steel girder, and the height adjusting device is used to adjust the continuously changing elevation of the steel girder during the pushing process so as to achieve the height difference of the top piercing beam of nearly 3m. The overall construction of the steel box girder of the Investeel Bridge has the characteristics of large span, large mass, high center of gravity, great difficulty in pushing the linear control and large height of the falling beam. The smooth construction of the bridge provides a reference for similar projects.