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The difference between small resistance and constant resistance of high-speed rail.
Feb 25, 2018

Railway line solution to the heat bilges cold shrink from the rail is commonly adopted the practice of fastener tighten, is to replace the shell fastener with spring fasteners (also called elastic fasteners), the rail tightly buckled on-orbit pillow, digest forced the heat bilges cold shrink to produce energy, but that there is a problem, is when the heat bilges cold shrink to produce more energy than the adhesion of the sleeper in the unit of distance, it make the rail track, sleeper rail appear distortion in unit range.

To solve this problem, the railways, at a distance in rail waist rail some holes to release the energy produced by the heat bilges cold shrink, and within a certain distance (about 1500 m) reserved rail joint, to assist in the release of heat bilges cold shrink to produce energy, rail, in order to solve the problem of heat bilges cold shrink.

First of all, steel rail steel is not domestic, all imports, the maximum guarantee of rail quality.

The second point is to use the new fastener, which is to use the new fasteners, to fasten the rail more firmly to the road bed, and the high-speed railway basically adopts the ballastless technology, the fastness is better than the ordinary railway.

Third, during the construction of the rails, the time to choose the season or time period to the steel rail thermal expansion and contraction of the minimum, so laid up, the problem will be a small part.

Now to build the beijing-tianjin high-speed railway is very long seamless rail, only switch the station area can have juncture, in between the two station unit rail as an observation unit, on either side of the rail road shoulder embedded in each unit have observation pile, on a regular basis to the unit rail creep measurements, when abnormal amounts of crawling (that is, the internal stress), the need for stress relief pipe construction, eliminated by stress relief pipe rails for heat bilges cold shrink stress caused by abnormal.

In the end, there is a large span steel girder bridge with a telescopic regulator to adjust the steel rail's expansion.