Shandong Huaning Electric Heating Technology Co., Ltd.
Application of electric heating system in freezing of tunnels of Qinghai-Tibet Railway
In the example of the Guanjiao Tunnel of the Qinghai-Tibet Railway, electric heating cables are laid in the side ditch, the central drainage groove of the bulk layer and the hidden drainage pipe outside the tunnel. This can solve the problem of ice accumulation and frost damage and ensure the safety of train traffic.
Nov 14,2022
Tunnels pass through cold and very cold areas, and freezing often occurs in cold conditions, seriously endangering driving safety. With the large-scale construction of tunnels in the cold regions of my country, the method of "combining prevention, drainage and heat preservation" is mainly used to prevent freezing and control tunnels in cold regions. Drainage hole and other methods. Take the Guanjiao Tunnel of the Qinghai-Tibet Railway as an example. The electric heating cables we supplied are used in the side chute, the central drainage groove of the bulk layer and the hidden drainage pipe outside the tunnel. After years of practice, our electric heating cables continue to work well, addressing ice buildup and freezing damage, and keeping trains safe.
The Guanjiao Tunnel is located in Ulan and Tianjin counties of Qinghai Province on the western (Ning) Ge (Ermu) section of the Qinghai-Tibet Railway with a total length of 32.645 km. The Xinguanjiao tunnel, as a control project of the second line of the Sig (Xining-Golmud) railway project, was fully launched on 6 November 2007. The Guanjiao Tunnel is the longest high-rise tunnel in the world and the longest tunnel in China. The Singuanjiao Tunnel is located on the Qinghai-Tibet Plateau, extremely cold and hypoxic, sparsely populated, with extremely harsh natural conditions, with an average altitude of 3,500 meters. The structure of the tunnel consists of two separate single-track tunnels with a total length of 32,645 km.
HCL series electric heating belt is a kind of electric heating product with a wire core as a heating element. Since the resistance per unit length of the wire core and the passing current are constant, the entire heating belt is heated evenly from end to end, and the output power is constant. Its biggest feature is its long length of use, which is mainly suitable for heating and heat preservation of single pipelines of long and ultra-long length. The maximum length of the power point is from several hundred meters to several thousand meters.
After installing our electric heating in the Guanjiao Tunnel, the ambient air temperature of the sleeping tank was kept above zero, the embankment layer of the inverted arch did not freeze, the track surface was dry, the drainage of the central drainage channel was normal, so the freezing phenomenon was effectively cured by the solution.
In addition to Qinghai-Tibet railway tunnels, in recent years, we have provided qualified electric heating for many railway and road tunnels. Antifreeze with fire pipes such as Longmen Highway Tunnel, Qinglan Expressway, Xishang Expressway, Basumu Tunnel of Jibao Railway, Jining Tunnel, Huoyanshan, Fenghuangling Tunnel, Uzbekistan Anglian-Pabu Railway Tunnel, Pingyswang Expressway D.
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