浙赣线渎口大桥是5孔14.82米的钢筋混凝土Ⅱ型梁,于1950年施工。运营以来,随着行车速度的提高和振动的加剧,梁体裂纹逐渐扩大。1973年4月检查时,发现梁体裂缝宽度大于0.3毫米者有二十二条,宽度最大达0.55毫米,长达2.2米,两肋侧面对称的竖向裂纹大部份裂透贯穿,裂纹两端细中间宽,机车通 Zhejiang-Jiangxi line ditch mouth is a 5-hole 14.82 meters of reinforced concrete Ⅱ beams, construction in 1950. Since operation, with the increase of driving speed and the aggravation of vibration, the crack of beam body gradually expands. April 1973 inspection and found that the beam body crack width of more than 0.3 mm, there are twenty-two, the maximum width of 0.55 mm, up to 2.2 meters long, two rib lateral symmetry of the vertical crack most of the crack through, crack two Fine middle width, locomotive pass