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本文介绍一座被大型打桩船严重撞伤的某大桥。H形下弦杆翼缘52～76mm厚的钢板束产生最大弯曲矢度达123mm,局部集中应力据推算已接近钢材屈服点。本文着重介绍了局部封闭式方形顶架的设计及顶力值估算、冷矫顶平施工采用的设备及具体操作方法和体会。由钢梁加固情况表明,钢结构杆件被撞弯曲后,应力分布紊乱,局部应力增大数倍,顶平后能基本恢复应力的正常状态;还证明以3号桥梁钢制造的大型钢梁的杆件,弯曲后在受力状态下,用冷作的方法是可以矫正其严重变形的。为今后运营铁路钢桥修复,提供了有参考价值的例证。
This article describes a bridge severely hit by a large piling rig. H-shaped lower chord flange 52 ~ 76mm thick steel sheet bending maximum bending degree of 123mm, the local concentration of stress is estimated to be close to the steel yield point. This article focuses on the design of partially enclosed square top frame and the estimation of the top force value, the equipment used in cold top leveling construction and the concrete operation method and experience. Reinforced by the steel beam shows that the steel structure is bent after the bending, the stress distribution disorder, local stress increase several times, after the top level can basically restore the normal stress state; also proved to No. 3 steel bridge made of large steel beam Of the rod, after bending in the stress state, with the cold method is to correct its serious deformation. For the future operation of railway steel bridge repair, provides a reference value example.