阶梯式增大截面积法在铁路桥墩加固中的应用研究

Application of Stepped Enlarging Section Method in Railway Bridge Pier Reinforcement

既有线桥墩加固通常通过增大截面积法,增加桥墩横向和纵向刚度。诸多增大截面方法中,通过计算对比,阶梯式增大截面积法基础负载提高率较小,方案较为经济、有效,可操作性强。通过大准线上的下脑亥东沟大桥的检测、阶梯式增大截面法加固的实践,结合加固设计理论分析和加固后实际测试结果,证明阶梯式增大截面法,对铁路桥梁横向振幅过大病害的加固效果较好,操作方便快捷,值得借鉴和推广。

The existing lines pier reinforcement usually increases piers lateral and longitudinal stiffness according to the enlarging section area method. The calculation and comparison results show that among the enlarging section area methods, the growth rate of foundation load of laddered enlarging section area method is the smallest, and the program is more economical, effective and operable. Through the field test of the Xianaohai Donggou Bridge in the Datong-Zhungeer railway and the practice of stepped enlarging section method, combined with the reinforcement design theory analysis and actual test results after reinforcement, it is concluded that the stepped enlarging section method is effective for lateral reinforcement of railway bridge piers, and it is easy to operate and worth learning and promotion.