高速铁路特大桥上双块式轨道结构设计及施工质量控制

北盘江特大桥桥跨布置方式特殊,对轨道结构形式及施工质量有严格要求。桥上采用双块式单元道床板与纵连底座相结合的轨道结构形式。在道床板和底座之间设置隔离层,同时在道床板两端底面设置与底座板一体的限位凸台限制其位移,可降低结构的整体破坏可能,保证结构的稳定性。对比不同端刺结构方案对轨道结构的受力变形影响,并从施工角度叙述道床板和底座板施工的施工工艺及质量控制要点。在隧道内采用不设端刺的摩擦板方案,既减小了对隧道内轨道结构影响,又保证了桥上轨道结构安全稳定,且有利于节省工程投资,便于施工质量控制;对施工各环节进程质量控制,可提高轨道的使用寿命,降低后期维护成本。

Structural Design and Construction Quality Control of Double-slab Track on High-speed Railway Major Bridge

Beipanjiang major bridge is designed with special bridge span arrangement,which has strict requirements for track structure form and construction quality. Double-slab ballastless track and continuous seating plates are used on the bridge. An isolation layer is provided between the road deck and the base,while the limit boss is set in integration with the seating plate at the two ends of the track slab bottom to reduce possible overall damage and ensure the stability of the structure. The effects of force and deformation generated by different programs of the thorns track structure are compared, and construction processes of double-slab ballastless track and continuous seating plate and key quality control points are illustrated. The applied program uses friction plate without end thorn,which not only reduces the impact on track structure in the tunnel,ensures the security and stability of the bridge track structure,but also helps save investment and reinforce quality control. In addition,process quality control prolongs track service life and cuts maintenance cost.