Method for renovating open-joint grouting damage of CRTS I-type double-block ballastless track sleeper

Abstract

The invention relates to a method for renovating open-joint grouting damage of a CRTS I-type double-block ballastless track sleeper. The method comprises the following steps: planting steel bars and anchoring roadbed slabs on two sides of the damaged sleeper; polishing the top surface of the roadbed slab; installing a WJ-7 type fastener embedded sleeve; chiseling away roadbed slab concrete at thediseased sleeper; pouring grouting materials into the ballast bed pit; removing the original WJ-8 type fastener, and installing the WJ-7 type fastener for transition; dismounting a WJ-7 type fastenerfor transition; installing an original WJ-8 type fastener; performing fine adjustment of steel rail. The stress form of the ballastless track structure does not need to be changed, and the stress stability of the ballastless track after renovation is guaranteed. The fasteners do not need to be repeatedly adjusted so that the maintenance workload is reduced, and the empty hanging damage of the sleeper with limited fastener adjusting capacity is treated; the used grouting material has high flowability, micro-expansibility and good bonding strength, after concrete of a roadbed slab at the heightof the sleeper is chiseled away, gaps of new and old joint parts can be thoroughly eliminated by pouring the grouting material, the periphery of the sleeper is effectively and completely filled, and the treatment is thorough according to the reasons of diseases.

Description

technical field [0001] The invention relates to the technical field of railway tracks, and in particular to a treatment method for slurry-emission disease of CRTS I-type double-block ballastless track sleepers. Background technique [0002] The CRTSI type double-block ballastless track has high stability and durability as a long layered structure. Generally speaking, the track maintenance and repair workload is small, but because it is exposed to the atmospheric environment all the year round, it withstands temperature and rain. The long-term effects of environmental factors such as cyclic train dynamic loads are likely to cause diseases such as slipping and even falling blocks between the separation joints between the sleeper and the ballast bed. The repeated slurrying of the sleeper leads to the continuous precipitation of fine particles between the sleeper and the ballast bed, and the formation of empty suspension between the sleeper and the ballast bed causes serious bad...

AI Technical Summary

Problems solved by technology

2. The vibration frequency of the double-block sleeper and the ballast bed slab is inconsistent, and there is a phenomenon of beating between the two under the load of the train

3. The existence of separation gaps amplifies the impact of the train and further destroys the concrete of the track bed slab around the double-block sleeper, forming a falling block

[0004] At present, the rail surface irregularity transition treatment method of CRTSI type double-block ballastless track sleepers is usually adjusted by adjusting the fasteners to adjust the elevation of the rail surface to meet the smoothness requirements. However, the adjustment ability of the fasteners is limited. Solve the root cause of the muddying disease. Under repeated train loads, the empty suspension under the rails will become more and more serious, which will exceed the adjustment range of the fasteners; another method is to inject glue on the diseased sleeper to fill the gap between the sleeper and the concrete track bed. Gap, but it often develops to the point where the gap is already large when the sleeper is empty, and the gaps are wet and full of impurities. The glue injection material is not easy to support under the action of a humid environment. In addition, the moving water repeatedly washes down the glue injection material It is easy to fail, so this method has extremely high requirements on the performance of the glue injection material. According to the field effect improvement survey, the recurrence rate of sleeper diseases after glue injection is high, indicating that the compactness problem between the sleeper and the concrete track bed has not been fundamentally resolved

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