沪昆高铁北盘江特大桥聚氨酯固化道床施工质量控制技术

Construction Quality Control Technology of Polyurethane-stabilized Ballast Bed on Beipan River Super Bridge of Shanghai-Kunming High Speed Railway

聚氨酯固化道床是一种新型的轨道结构,兼备有砟轨道和无砟轨道的优点,可在有特定需要的区段铺设。沪昆高铁北盘江特大桥主桥为跨度445 m的上承式钢筋混凝土拱桥,设计的聚氨酯固化道床轨道结构受温度和徐变作用影响比较小,有利于线路的稳定且维修方便。本文介绍了碎石道床填筑和聚氨酯固化道床浇注施工质量控制技术,并对线路质量进行了动态测试。测试结果表明,北盘江特大桥聚氨酯固化道床能够满足列车运行安全性和稳定性要求,同时也适应高速铁路大跨度桥梁变形的要求,轨道平顺性良好,质量控制措施效果显著。

Polyurethane-stabilized ballast bed is a new type of track structure,which has the advantages of ballast track and ballastless track and could be laid in sections with specific requirements.Beipan river main bridge is the deck-type reinforced concrete arch bridge with 445 m span in Shanghai-Kunming high speed railway and the temperature and creep effect has little influence on the track structure with polyurethane-stabilized ballast bed,which could be propitious to railway line stability and convenient maintenance.This paper introduced the construction quality control technology of the gravel ballast bed filling and polyurethane-stabilized ballast bed pouring and dynamic test of the railway line quality was carried out.The test results indicate that polyurethane-stabilized ballast bed of Beipan river super bridge could meet the requirements of train running safety and stability and also adapt to the requirements of long span bridge deformation in high speed railway at the same time,the track regularity is good and the quality control measures are effective.