高铁岔区长寿命现浇道床混凝土施工技术

Construction Technology of Long-life Cast-in-place Track Bed Concrete in Switch Area of High Speed Railway

按照以低胶材用量、低用水量、低坍落度、高含气量为基础,内掺适量抗裂剂为关键的技术路线,制备出抗裂、防冻性能优异的高铁岔区长寿命现浇道床混凝土。依托京沈客运专线试验段,对于18号单开道岔无砟轨道实体结构,采用斗送入模的方式,辅以研发的高频振捣台架,实现坍落度≤100mm的混凝土入模成型,同时结合“零暴露期”综合养护技术,基本解决道床板常见的八字角裂纹、横向贯通裂缝及表面冻融粉化等病害。

The long-life cast-in-place track bed concrete in switch area of high speed railway with excellent resistance of anti-cracking and antifreezing was prepared according to the technical route based on low cementitious materials consumption,low water consumption,low slump and high air content.Relying on the test section of Beijing to Shenyang high speed railway,the solid structure of No.18 turnout of high speed railway was casted by concrete with slump less than 100mm depend on bucket feeding mode and high frequency vibratory frame,and the concrete was curried by zero exposure period comprehensive maintenance technology.It has effectively solved diseases such as eight angle crack,lateral through crack and frequent freeze-thaw pulverization.