既有铁路浅基桥墩的加固设计和施工技术  

Strengthening Design and Construction Technique for Shallow Foundation Piers of Existing Railway Bridge

作　　者：黄洪猛 徐登云 路韡[1,2] HUANG Hongmeng;XU Dengyun;LU Wei(School of Civil Engineering,Northwest Minzu University,Lanzhou Gansu 730030,China;School of Civil Engineering,Lanzhou JiaotongUniversity,Lanzhou Gansu 730070,China;The Second Engineering Co. Ltd. of CTCE Group,Suzhou Jiangsu 215131,China)

机构地区：[1]西北民族大学土木工程学院,甘肃兰州730030 [2]兰州交通大学土木工程学院,甘肃兰州730070 [3]中国中铁四局集团第二工程有限公司,江苏苏州215131

出　　处：《铁道建筑》2019年第3期26-30,共5页Railway Engineering

基　　金：中央高校基本科研业务费专项资金项目(31920150073)

摘　　要：青海省东部湟水河一既有铁路浅基桥墩受常年流水冲刷影响基础和桥墩局部冲刷严重,导致河床对基础的约束强度降低,桥墩自振频率和横向振幅超限,横向刚度严重不足。据此,提出对既有基础底部进行注浆处理,增补桩基和外包钢筋混凝土加固既有桥墩的方法,介绍了主要加固设计内容及主要工序的施工技术。通过理论分析可知该加固设计对于提高桥墩横向刚度和自振频率有显著效果,可为既有铁路浅基桥墩及相关结构的加固提供参考。Some shallow foundation piers of an existing railway bridge over Huangshui river in eastern Qinghai province are affected by perennial running water scouring,and the foundation and pier local scour are severely,resulting in the reduction of the restraint strength of the foundation,the excessive pier natural frequency and transverse amplitude,and the serious insuff iciency of transverse stiffness.Based on this phenomenon,the methods of grouting at the bottom of existing foundation,adding pile foundation and w rapping reinforced concrete to reinforce existing piers were put forw ard. The main reinforcement design contents and construction technique of main procedures were introduced. Through theoretical analysis,it can be know n that the reinforcement design has a significant effect on improving the pier transverse stiffness and frequency,and can provide a reference for the reinforcement of shallow foundation piers of existing railway bridge and related structures.

关 键 词：铁路桥梁 浅基桥 加固设计 施工技术 理论分析 增补桩基 外包钢筋混凝土 

分 类 号：U24[交通运输工程—道路与铁道工程]