浙江省三门县金鳞大桥超长构件施工技术

金鳞大桥的上部结构为(40+3×65+40)m的5跨Y形连续刚构桥。该桥Y形墩和0号块很长,其中1,4号墩0号块长度为27.00m,2,3号墩0号块32.50m。这样就造成悬臂的长度较大。该桥处于沿海地区海淤泥土质,无法搭设满堂支架进行施工,采用组合支架和临时拉杆成功解决了该技术难题。通过该桥的Y形墩和0号块的施工实例,讲述Y形刚构桥超长Y形墩和0号块的施工工艺、技术控制要点。

Construction Technology of Super-long Structure Members of the Jinlin Bridge in Sanmen County, Zhejiang Province

The top structure of Jinlin Bridge is five-span Y-shape continuous rigid bridge of(40+3×65+40)m.The Y-shape piers and No.0 pieces of the bridge belong to super-long members,among these the length of No.0 piece of the No.1 and No.4 piers is 27m and the ones of No.2 and No.3 piers is 32.5m,so the cantilever length is very big.Because the bridge locates in mud soil in coastal area,full scaffold is not erected to construct these members.Combination scaffold and temporary pull rod are used to successfully solve the technique difficulty.Based on practice project of these members,the authors show the construction technologies and key control points of these members.