| With the high-speed railway and passenger dedicated line development, the comfort and safety of the track become more and more important, the traditional ballasted track has been unable to meet the requirements of the development of high speed railway, so as to promote the rapid development of ballastless track technology. The CRTS â…¡ ballastless track structure has been laid in the Beijing-Tianjin inter city and the Beijing-Shanghai High-speed Rail lines, but with the increasing of the operation time, somewhere CRTS II slab tracks are damaged, so study of maintenance and repair technology of CRTS â…¡ ballastless track is very necessary.Firstly, the CRTS â…¡ ballastless track maintance methods are acquired by literature retrieval and investigation of Beijing-Tianjin intercity and Beijing-Shanghai high speed railway line, respectively. It is summarized and analysised that rail-support stage damage (including plastic casing damage, bearing rail station damage and abutment damage); slab damage (including the surface peeling, slab arch, concrete seam crushing and slab split); separation between slab and mortar layer and lateral concrete block diagonal cracking. Then proposed the three level classification of the effects of maintance of CRTS â…¡ ballastless track on the structure:influence of the track appearance, influence of the track local function and influence of track structure.Based on the CRTS II slab ballastless track structure on bridge, the analysis model is developed. The longitudinal force characteristics of CRTS â…¡ slab track are compared with the maintance of anchorage.According to the anchorage effect on the expansion additional force characteristics of rail, slab and base plate on the bridge, the conclusion is that the maintance of anchorage has little effect on the expansion force of the structure, it can be negligible.Based on the analysis of the CRTS â…¡ model, the conclusion is that the maintance of anchorage has large effect on the expansion force of the structure. In order to prevent the anchorage of the slab and base plate, and to keep under symmetrical stress, it is suggested that at least 4 rebars. At the same time it should be checked the stress-free temperature of rail. |
