Feasibility study on the solution of replacing track slab with lateral pushing rail in one maintenance window time. (2nd January 2023)

• Record Type: Journal Article
• Authors: Wang, Xin; Ding, Yu; Zhao, Jingcun; Ji, Lei; Mao, Chenchen; Zhuang, Yingbin
• Is Part Of: Construction & building materials. Volume 362(2023)
• Publication Date: 2023-01-02
• Subjects: Engineering technology -- High-speed railway -- Track slab replacement -- Lateral pushing rail solution -- Track maintenance -- Numerical simulation; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.129658
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: A new solution for replacing track slabs of ballastless tracks is proposed. No previous studies on related issues were reported in open literatures. The solution can meet the requirements of repairing in one maintenance window time. The feasibility of the solution is verified by simulation and field test results. Abstract: The slab ballastless track is the primary type of high-speed railway. When the track slab in the ballastless track is severely damaged, the typical way to replace it requires cutting the jointless rail above the damaged track slabs. This paper discusses a solution of pushing the rail in the lateral direction (i.e., without cutting the rail) to replace the track slab. To study the feasibility and reliability of this solution, a finite element model for simulating the construction process of rail pushing is established. The necessary spacing of the support slides and the capability of the pushing device are analyzed. The influence of parameters such as the rail release length and the construction temperature on the mechanical state of the rail after being pushed is discussed. In practice, the repair time is limited to one maintenance window (i.e., 4 h). The control of the stress is critical in repairing progress. The corresponding relationship between the deformation curvature of the rail and the stress is studied, and the number of unlocking fasteners is reduced by optimizing the spacing of the rail support slides, which can effectively reduce the fine-adjustment range of the rail after changing the slab. By calculation and design, a "16 + 8 + 16 m" optimization plan is proposed, which can meet the needs of replacing the track slab in the four-hour maintenance window time of high-speed railway. Finally, the feasibility of the finite element model is verified through the comparative analysis of the monitoring data of the lateral pushing of the rail and the simulation analysis results.