高速公路改扩建工程中拼宽桥梁的设计与施工关键技术分析

通过改建现有公路提升路网通行能力是可行的,能持续满足不断增长的交通量需求的同时节约土地资源。研究了西南部山区具有代表性的桥梁实例,详细调研了山区拓宽桥梁的结构型式和施工特点,在此基础上,通过设定不均匀沉降值,研究拓宽桥梁拼接部位在给定沉降荷载下的力学响应,对比分析了截面配筋、拓宽宽度、拼接部分宽度等参数对拼宽部位结构受力影响的程度及其影响规律,研究改扩建工程中拼宽桥梁关键技术。

Key Technology Analysis of Design and Construction of Widening Bridges in Highway Reconstruction and Expansion Project

It is feasible to improve the capacity of road network by rebuilding existing highways,which can meet the increasing traffic demand and save land resources.This paper studies the representative bridge examples in the mountainous areas of Southwest China,investigates in detail the structural types and construction characteristics of widened bridges in mountainous areas,and on this basis,studies the mechanical response of widened bridge splicing parts under given settlement loads through given uneven settlement.Through comparison,the reinforcement and widening of section are analyzed.The degree and regularity of the influence of the parameters such as degree and width of splicing part on the stress of the splicing part structure are studied,so as to realize the research on the key technology of the splicing bridge in the reconstruction and extension project.