CRTSⅢ型板式无砟轨道施工精调装置拆除时间的研究

Research on the Best Time of Removing Fine Tuning Control Device during the Construction of CRTSⅢ Ballastless Slab Track

为了研究CRTSⅢ板式无砟轨道在施工过程中精调装置拆除的最优时间,采用有限元方法建立单元板式无砟轨道的实体模型,通过考虑精调爪的安装数量以及不同地区存在的温度梯度的差异情况,进行其最优安装数目及拆除时间的研究。计算结果表明:精调爪数目为4组时可最有效地减小轨道板的翘曲变形;在温暖地区,当自密实混凝土强度达到35%之后可拆除精调爪;在寒冷地区,当自密实混凝土强度达到45%之后可拆除精调爪;在严寒地区,当自密实混凝土强度达到50%之后可拆除精调爪。由此可最大限度地加快施工进度且不影响轨道施工质量。

To determine the best time of removing the fine tuning control device during the construction of for CRTSⅢ ballastless slab track, the author establishes a model of ballastless slab track with finite element method to study the optimal number of installation and the best time of removing the device in view of the number of fine tuning control device and the thermal gradient in different areas. The results show that the optimal number of fine tuning control device is four, and this could reduce the deformation of slab track efficiently; in worm regions, the fine tuning control device could be removed when the self-compacted concrete strength reaches 35% of its final strength or 45% in cold regions. Besides, the device could be removed when the concrete strength reaches 50% of its final strength in severe cold regions. Thus, the progress of construction could be increased most effectively while track construction quality guaranteed.