郑徐客运专线CRTSⅢ型板式无砟轨道自密实混凝土施工工艺探讨

摘要

According to the adjustment layer structure characteristic of CRTS Ⅲ slab-type ballastless track in high-speed railway,the performance control index,perfusion pattern,track slab compress process parameters,the overflow-control pipe height and curing ways of self-compaction concrete ( SCC ) were studied based on a large number of perfusion tests. The results showed that collapse spread of SCC is 650 mm and the perfusion effect of middle hole is the best,the number of compress device straight line section is 4 and the number of curve section is 5 for each track slab,the suitable moment value of each nut is 80 N·m,which is exerted by torque wrench,the height of overflow-control pipe should be 50 cm,and the appropriate curing way for SCC is curing agent.%针对高速铁路CRTSⅢ型板式无砟轨道调整层结构特点，在大量灌板试验的基础上，分析了自密实混凝土性能控制指标、灌注方式、轨道板压紧工艺参数、防溢管高度及自密实混凝土养护方式。结果表明：自密实混凝土塌落扩展度650 mm，中间孔灌注效果最优；每块轨道板压紧装置设置数量直线段为4道、曲线段为5道，每个螺母通过扭矩扳手施加80 N·m 的力矩比较合理；防溢管高度宜设置为50 cm；自密实混凝土采用养护剂养护较好。