What Is the Respiratory Zone?

The seamless mobile breathing zone (temperature mobile part of CWR track) is also called the seamless mobile telescopic area. The end of the long rail of the thermal stress type or regular release type seamless rail, the temperature force value is between the resistance of the rail joint at the end of the long rail and the maximum temperature force value in the fixed area.

The seamless mobile breathing zone (temperature mobile part of CWR track) is also called the seamless mobile telescopic area. The end of the long rail of the temperature-stressed or regular release seamless rail, the temperature force value is between the resistance of the rail joint at the end of the long rail and the maximum temperature force value in the fixed area

Jointless track is also called welded long rail track. Rails are laid with welded long steel rails of considerable length. It can eliminate rail joints to the greatest extent, extend the service life of rolling stock and rail equipment, reduce maintenance workload and reduce maintenance costs. It has the advantages of smooth running and comfortable passengers, and is an important technical measure for the modernization of railway track structure ^[1]

Seamless motion fixed part (temperature motionless part of CWR track) The middle part of the long-stroke rail of temperature-stressed or regular release type seamless rail, which accumulates the maximum temperature force, no longitudinal displacement of the rail, and no sleeper exerts longitudinal resistance on the rail Because it is a frequent occurrence area of the track expansion track in the high temperature season, when the actual rail temperature is 10-20 ° C higher than the locked rail temperature, the maintenance operation methods such as chopping, lifting, and lane changing that seriously weaken the lateral resistance of the track bed should be restricted; All work should be prohibited when it is higher than 20 ^[1]

Adjusting part of CWR track, also known as seamless track adjusting area, is a common line section composed of a small number of standard length steel rails, which is located between the temperature stress type or the periodic release type seamless line expansion zone. Because the ends of the long rails expand and contract with changes in rail temperature, excessive displacement may occur at the joint. If two long rails are directly connected, the formed rail joint is difficult to perform. Generally, an ordinary line is added in between, which is absorbed by several rail joints on the ordinary line segment. In order to eliminate the adverse effects of the expansion and contraction zone of the seamless line on the turnout equipment or the railway rail insulation joint of the automatic closed line, etc., it is also necessary to set up an adjustment zone. Due to the existence of rail joints on it, which form a concentrated point of track irregularity, it is a weak link in welding long rail lines. It should be paid equal attention to the expansion zone in maintenance and repair work ^[1] .