Ballastless track damaged sleeper replacement method

Abstract

The invention discloses a high speed railway ballastless track damaged sleeper replacement method which comprises the following steps: firstly, removing the damaged sleeper, then mounting and fixing anew sleeper, and pouring the new sleeper and a track plate into a whole again; cutting at a proper depth at the boundary of a forcible entry range; adopting high-pressure water jet to cut the area within the forcible entry range; cutting off a plurality of longitudinal reinforcing steel bars in the track plate; carrying out sleeper replacement and fixation, connecting the plurality of cut off longitudinal steel bars; pouring concrete or mortar at the forcible entry part to pour the new sleeper and the track plate into a whole, carrying out leveling maintenance, and temporary supporting on thetwo sides of the replaced sleeper, before skylight time is over, loosening fastener bolts on the sleeper again, removing a base plate below the sleeper, and recovering fasteners after the strength ofthe poured concrete or mortar reaches the designed strength. By means of the method, new cracks cannot be formed in existing concrete, original structural steel bars cannot be damaged, the construction range is accurate, the interface of the dismantled concrete is rough, the binding power is high, binding of new concrete and old concrete is facilitated, and the integrity is better.

Description

technical field [0001] The invention relates to the technical field of ballastless tracks of high-speed railways, in particular to a method for replacing damaged sleepers of ballastless tracks of high-speed railways. Background technique [0002] By the end of 2019, the operating mileage of my country's high-speed railways has reached 35,000 kilometers, and most of the track structures are ballastless tracks. Double-block ballastless track is one of the main types of ballastless track structure for high-speed railways in my country, which has the advantages of uniform structure and low construction cost. Ballastless track, as the foundation of the train, has been exposed to complex natural environments for a long time. Due to the long-term effects of train load, temperature, rain and other factors, the track structure is prone to damage, which affects the overall strength of the track. Loosening, cracks in the contact surface of old and new concrete, seepage of sleepers and...

AI Technical Summary

Problems solved by technology

The cutting method will cut off the steel bars in the structure. When reconnecting the steel bars, it is still necessary to chisel out the concrete to connect the steel bars. It is not suitable for the reinforced track bed slab structure; the hammering and impact methods will cause the nearby intact concrete body to vibrate And cause new micro-cracks, and then aggravate the damage of concrete. When using this method to replace the sleeper, there will be a damaged layer in the old concrete section, and the integrity of the sleeper will be poor after the replacement of the sleeper; due to the obstruction of the steel bar during hammering and impact crushing, the crushing efficiency is low ; Once the steel bars are cut off, the integrity of the ballast bed will be destroyed, and the replacement cannot be completed in time, which will increase the risk of damage to adjacent sleepers

The existing hammering and impact methods form deep damaged cracks in the existing concrete, causing the interface to greatly reduce the strength of the damaged layer on the side of the existing concrete. After repair, the interface is still a weak layer, which will cause secondary damage

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