我国××铁路专用线跨越汉江处,两岸峭壁,每年有五个月为雨季,洪水峰高量大,猛涨猛落,每小时可升高15—16米。普通水位和最高洪水位标高相差25米。深水墩受洪水期的控制4月至11月都不能施工。在这种情况下修桥,用一般桥式布置和定型钢梁设计难以实现多快好省,而必须做特殊设计。原设计第一方案为64+112+64+ China’s special railway line xx traverses the Hanjiang River. On both sides of the cliffs, there are five rainy seasons every year. The flood peak is high and plunged rapidly, raising 15-16 meters per hour. The difference between ordinary water level and maximum water level is 25 meters. Sham pier by flood control April to November can not be constructed. In this case, the bridge repair, with the general layout of the bridge and the shape of steel beam design is difficult to achieve much faster and better, but must do special design. The original design of the first program is 64 +121 +64 +