秀山西门桥长悬臂拓宽及截面转换加固施工监测分析  

Monitoring and Analysis of Long Cantilever Widening and Section Conversion Reinforcement Construction of Ximen Bridge in Xiushan

作　　者：冯德安 周伟[2] 曾如财 杨若愚[2] Feng Dean;Zhou Wei;Zeng Rucai;Yang Ruoyu

机构地区：[1]秀山华信国有资产经营有限公司,重庆409900 [2]重庆市建筑科学研究院,重庆400016

出　　处：《重庆建筑》2018年第12期18-21,共4页Chongqing Architecture

基　　金：重庆市建筑科学研究院科研合作项目"钢筋混凝土窄梁桥长悬臂钢梁拓宽及截面转换加固模型试验研究"

摘　　要：重庆秀山县西门桥为钢筋混凝土窄梁桥,截面形式较薄弱,承载能力在同类桥梁中偏小,实桥中主要表现为桥面狭窄通行能力小,通行车辆载重受限。为了解决上述问题,该桥加固改造从两方面同时入手:一是在不占用原主梁上部空间的基础上,选择在桥梁两侧增设长悬臂拓宽,改善桥面通行能力;二是通过增设底板,实现主梁截面由单个T梁到整体箱梁的转化,提高桥梁承载能力及桥梁整体性。该文对西门桥长悬臂拓宽及增设截面加固过程中的受力性能进行了实测分析,证实加固改造方法有效、可行,可为同类工程参考。Ximen Bridge in Xiushan is a narrow-beamed reinforced concrete bridge with weak sections and smaller bearing capacity than similar bridges,mainly reflected in small traffic capacity for narrow bridge section and limited traffic load.In order to solve the problems,the reinforcement renovation of the bridge starts from two aspects at the same time:first,on the basis of not occupying the upper space of the original main girder,long cantilevers are added on both sides to widen cross section and improve the traffic capacity of the bridge;second,by adding baseplate,the conversion of the main girder section from a single T-beam to an integral box girder is realized and thus the bridge's bearing capacity and integrity are improved.This paper proves that the reinforcement renovation method is effective and feasible,by analyzing the mechanical behavior of long cantilever widening and added baseplate reinforcement of the Ximen Bridge.

关 键 词：秀山西门桥 窄梁桥 长悬臂 增设底板 加固改造 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]