摘要
赣韶铁路疏解线跨京广铁路处受线路高程及桥下铁路净空限制,需采用建筑高度低的桥式结构,同时为减少后期维修保养对桥下铁路运营的干扰,桥面系不允许采用钢结构。综合考虑以上限制因素,设计采用一孔88 m钢-混凝土组合简支桁梁跨越既有铁路,桥面系采用混凝土槽形梁,此梁型具有造型美观、自重轻、跨越能力强、建筑高度低的优点,在立交条件困难时不失为一种较好的选择。文章重点介绍了桁式、桁宽、桁高、节间距及预应力槽形梁截面形式,通过有限元软件对杆件、系梁、行车道板及钢-混节点进行了系统分析,验证了设计的合理性;同时对钢-混凝土组合简支桁梁的施工进行了介绍,施工采用在既有铁路一侧浇筑混凝土槽形梁并拼装钢桁腹杆和上弦杆,然后整体侧位横移至设计位置并高位落梁,通过合理设置支墩及保护墩,保证了高位落梁的安全。
Limited by line elevation and clearance under bridge, where Ganshao railway untwining line crosses Jing Guang railway shall adopt a bridge structure with low building height, and the bridge deck system is not allowed to adopt steel structure to reduce the disturbance of later maintenance to railway operation. So in design, one 88m steel-con-crete composite simply supported truss girder crossing the existing railway is used, the concrete trough girder is adopted for bridge deck system. This girder type has the advantages of attractive appearance, light weight, large spanning ability and low building height. It is a good choice under difficult interchange conditions. This paper focuses on the truss type, height, width, spacing and prestressed channel beam cross-section form;by using the finite element software, system a-nalysis is performed to the rod, tie beam, carriageway plate and steel-concrete joint, the design rationality is verified;The construction of steel-concrete composite simply supported truss girder is adopted with pouring concrete trough beam and assembling steel truss web member and upper chord at one side of the existing railway, overall side cross-moving to the design location, by reasonably setting the buttress and protective buttress, the safety of high fall beam is ensured.
出处
《高速铁路技术》
2015年第1期90-94,共5页
High Speed Railway Technology
关键词
钢-混凝土组合桁梁
槽形梁
仿真分析
高位落梁
Steel-concrete composite truss girder
channel beam
simulation analysis
high fall beam
