佛山石湾大桥主桥施工技术

佛山石湾大桥主桥为(90.5+150+90.5)m的三跨连续矮塔斜拉桥.为避免受汛期的影响及保护水环境,承台及桩基础施工采取钢管桩+贝雷梁作为水上施工平台,待钻孔桩施工后,再拆除施工平台、插打单壁钢板桩围堰,在基坑开挖时选择干封法进行封底.主梁0号块采用预埋托架施工,1～16号块采用挂篮逐段悬臂现浇施工,合龙段采用挂篮作为吊挂、按先边跨后中跨的顺序进行施工.

Construction Techniques for Main Bridge of Shiwan Bridge in Foshan City

The main bridge of the Shiwan Bridge in Foshan City is a three-span continuous extradosed bridge with span arrangement(90.5+150+90.5) m.To avoid the flood period influence and to protect the water environment at the bridge site,the construction of the piles and pile caps of the bridge was carried out on the working platforms formed by the steel pipe piles+Bailey trusses.After the construction of the bored piles was completed,the working platforms were removed and the single-wall steel sheet piles were inserted and driven.At the time the foundation pits were excavated,the bases of the steel sheet pile cofferdams were sealed in dry condition.The segments No.0 of the main girder were constructed on the embedded brackets,the segments No.1~16 were constructed segment by segment with the form travelers by the cantilever cast-in-situ method and the closure segments were constructed in the sequence of the segments for the side spans first and the segment for the central span late,using the form travelers as the suspension platforms.