采用改换结构体系法的危桥加固施工关键技术  

Key Technology of Strengthening Construction of Dangerous Bridge by Changing Structure System

作　　者：刘乾坤 LIU Qiankun(South China Headquarter of CRCC Harbour&Channel Engineering Bureau Group Co.Ltd.,Guangzhou Guangdong 511400,China)

机构地区：[1]中国铁建港航局集团有限公司华南指挥部,广东广州511400

出　　处：《铁道建筑技术》2024年第9期118-121,共4页Railway Construction Technology

基　　金：中国铁建港航局集团有限公司科技研发计划项目(2023-B16)。

摘　　要：带挂梁的预应力混凝土T型刚构桥是上世纪70~90年代我国修建的大跨径梁桥的主要桥型之一,此类桥型在长期使用后存在明显弊端。为此,提出了一种体系转换的危桥加固新型方法,将原悬臂T构拆除后改换为连续刚构固结,该方法目前尚无经验参照。以G106线锦江大桥危旧桥梁改造工程为例,介绍一种采用改换结构体系法的危桥加固施工关键技术,包括结构物拆装技术、抗倾覆施工技术以及施工全过程监控等三个方面。该技术在实际施工中在保证安全的同时,也实现了节约成本和保证工效,可为类似工程提供解决思路。Prestressed concrete T⁃type rigid frame bridge with suspended beams is one of the main types of long⁃span girder bridges built in China from the 1970s to the 1990s.In view of this,a new method of strengthening endangered bridges by system conversion is proposed,which replaces the former cantilever T⁃type bridge with continuous rigid structure consolidation after demolition.There is no experience reference for this scheme at present.Taking the reconstruction project of endangered old bridges of Jinjiang Bridge of G106 Line as an example,this paper introduces a key technology of strengthening endangered bridges by means of structural system modification,including structure disassembly technology,anti⁃overturning construction technology and the whole construction process monitoring.This technology not only ensures safety in actual construction,but also saves cost and ensures work efficiency,and can provide a solution for similar projects.

关 键 词：挂梁 桥梁T构 危桥加固 体系转换 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]