Characteristics of Subway Sleeper Engineering

① The construction of track engineering requires the laying of seamless tracks at once, and the standard speed for passing inspection is to reach 80km/h. The track needs to have high smoothness and stability, and the construction technology requirements are very high.

② Improved the construction process of the original integral track bed, pouring concrete into the integral track bed in one go without the process of pouring support piers.

(2) Construction difficulty ①: The route is mainly located on elevated bridges, at a height of more than 20 meters, and in congested areas such as two highways, shopping malls, residential areas, and highway intersections. The materials and equipment required for laying the route need to be lifted onto the bridge for operation, making it difficult for materials to enter and climb onto the bridge. The working surface is restricted, and the transportation work on the bridge is heavy, and the protection below the bridge is difficult.

② The construction progress of offline units is inconsistent, with a total of 12 construction breakpoints, and the length of the construction breakpoints is between 200 and 400 meters, resulting in the inability to continue the construction of the track project. Only segmented construction can be carried out, and construction tools and mechanical equipment can be transported back, resulting in labor intensity.

③ The AMS60 mobile contact welding rail car is used to directly weld 25m steel rails into unit rail sections on the line. The welding equipment is matched with rail cars and flatbed cars, and the vehicle is heavy, with steep slopes and small curve radii, which increases the difficulty of rail welding operations.  

④ Due to the presence of DT VII 2 type fasteners and short sleepers, track shock absorber fasteners and short sleepers, DT VI 2 type fasteners and short sleepers, etc., the construction section is not concentrated enough on the line, with many sections, resulting in a large number of supporting tools being transported backwards.

⑤ Due to the long construction time span, winter cold construction and summer high temperature construction, different measures should be taken during concrete pouring construction to ensure construction quality.