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0.工程概况岷江特大桥位于四川盆地西南边缘的五通桥内,大桥的起讫桩号为LK1+452.328～LK2+458.328,全长1006m。岷江特大桥主桥上部为95+170+95m变截面三跨连续箱梁,断面形式为斜面2%的横坡,有内外腹板高差调整,底板水平,箱梁中线处梁高由4.5米变化至2米,桥板全宽为12.5米,其中翼板悬臂长2.725米.施工方法采用悬臂施工,预应力砼连续梁桥在悬臂施工时,由于墩梁铰接不能承受弯距,因此,施工时要采取临时支撑系统,待悬臂施工至少一端合拢后恢复原结构
0. Project Overview Minjiang Bridge is located in the southwestern margin of the Sichuan Basin Wutong Bridge, the bridge starting and ending station for LK1 +452.328 ~ LK2 +458.328, a total length of 1006m. The upper part of the main bridge of the Minjiang River Bridge is a 95 + 170 + 95m variable cross-section, three-span continuous box girder with a cross section of 2% of the slant slope with internal and external web height adjustment with floor level. Change to 2 meters, the full width of the bridge is 12.5 meters, of which the wing cantilever length is 2.725 meters. Construction method using cantilever construction, prestressed concrete continuous beam bridge in the cantilever construction, due to the pier beam can not withstand bending hinge, so the construction When to take temporary support system, until at least one end of the cantilever construction to restore the original structure