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Construction method of cross section-expanded loop type depressurizing portal for high-speed railway tunnel

A technology for high-speed railways and tunnels, which is applied in the field of construction of high-speed railway tunnel entrances. It can solve the problems of large increase in the amount of tunnel construction, difficulty in shaft construction, and high construction costs, so as to reduce aerodynamic effects and increase ride comfort. The effect of high reliability and low construction cost

Inactive Publication Date: 2011-07-20
SOUTHWEST JIAOTONG UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

For extra-long tunnels, often because of the great depth of burial, the difficulty of shaft construction and high cost, this decompression method is difficult to popularize and use; 2. Enlarging the cross-sectional area of ​​the tunnel, by reducing the blocking ratio (the ratio of the cross-sectional area of ​​the train to the cross-sectional area of ​​the tunnel) ) to decompress, due to the adoption of this method, the amount of tunnel construction has increased greatly, and its construction cost is high, so its use is also limited; 3. To improve the air tightness of rolling stock, this method can only improve the ride in the compartment However, when the airtightness of the locomotive reaches a certain level, it is difficult to improve the airtightness, the technical difficulty is high, the maintenance cost is high, and the economy is poor, so it cannot be widely used.

Method used

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  • Construction method of cross section-expanded loop type depressurizing portal for high-speed railway tunnel
  • Construction method of cross section-expanded loop type depressurizing portal for high-speed railway tunnel
  • Construction method of cross section-expanded loop type depressurizing portal for high-speed railway tunnel

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Embodiment

[0023] Figure 1-4 Show, a kind of embodiment of the present invention is, a kind of construction method of high-speed railway tunnel enlargement cross-section circuit type decompression hole, and its way is:

[0024] A, build 15~20m long expansion section 11 at the opening place of tunnel 10, the sectional area of ​​expansion section 11 is 1.3~1.6 times of tunnel 10 sectional areas;

[0025] B. Build side guide tunnels 12 parallel to the tunnel 10 and 2 to 3 times the length of the enlarged section 11 on both sides of the tunnel 10 entrance. The outer ends of the side guide tunnels 12 communicate with the outside world. The lateral distance is 20-30m, and the cross-sectional area of ​​the side pilot tunnel 12 is 25%-35% of the cross-sectional area of ​​the tunnel 10;

[0026] C. Build horizontal first, second and third cross passages 20, 21, 22 between the pilot tunnels 12 and the tunnel 10 on both sides. The longitudinal position of the first cross passage 20 is located in ...

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Abstract

The invention relates to a construction method of a cross section-expanded loop type depressurizing portal for a high-speed railway tunnel, which comprises the following steps of: A, constructing an expanding section at the portal of a tunnel, wherein the cross-sectional area of the expanding section is 1.3-1.6 times larger than that of the tunnel; B, constructing lateral pilot tunnels at both sides of the portal of the tunnel, wherein the lateral pilot tunnels are parallel to the tunnel and are communicated with the outside, the lateral distance between each lateral pilot tunnel and the tunnel is 20-30m, and the cross-sectional area of each lateral pilot tunnel is 25-35% of the cross-sectional area of the tunnel; and C, constructing first, second and third transverse channels which transversely penetrate through the lateral pilot tunnels and the tunnel between the two lateral pilot tunnels. The portal of the railway tunnel constructed by using the method can effectively reduce micro pressure waves produced by a high-speed train moving into the tunnel, is easy to construct, is not influenced by the surrounding topography of the tunnel and has low construction cost.

Description

technical field [0001] The invention relates to a method for constructing a railway tunnel, in particular to a method for constructing an opening of a high-speed railway tunnel. Background technique [0002] With the opening of the Beijing-Tianjin Intercity Express Line, Zhengxi, and Wuhan-Guangzhou Passenger Dedicated Lines with a speed of 350km / h, it marks that my country's high-speed train technology is becoming more and more perfect, so that Chinese people can look forward to the travel problems that will plague 1.3 billion people in the near future can be completely resolved. Of course, with the increase of the speed of high-speed railway, it will also cause many new problems. When a train enters a railway tunnel at high speed, an initial compression wave will be generated in front of the train, and this wave will propagate forward along the tunnel. When the compression wave reaches the exit of the tunnel, it will be reflected to the entrance as an expansion wave. At t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/14
Inventor 王英学高波申玉生张超周佳媚贺旭洲全晓娟高玄涛付业凡
Owner SOUTHWEST JIAOTONG UNIV
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