Permanent and temporary combined anti-freezing drainage structure and method for high altitude severe cold rich water tunnel

Abstract

The invention discloses a permanent and temporary combined anti-freezing drainage structure and method for a high altitude severe cold rich water tunnel. A parallel pilot pit is arranged on the side lower than a tunnel cavity body section and communicated with the tunnel through a transverse channel. Full section grouting is conducted on a tunnel cavity opening section full section to form a superfine cement full section grouting blocking solidification ring. Two inclined drainage holes are formed in the outside of the blocking solidification ring at the positions lower than two sides of a cavity opening. At least one end of the parallel pilot pit is communicated with the outer portion of the tunnel through a drainage cavity arranged in an inclined mode. According to the tunnel running wind flowing characteristic of high altitude severe cold zones, the parallel pilot pit which is excavated in advance in a construction period and lower than the main line tunnel position is utilized to achieve main line tunnel bottom embedded heat insulation transverse drainage, and a tunnel vertical reversed V-shaped drainage pipe is matched to improve drainage of tunnel surrounding rock water. Smooth drainage of the high altitude severe cold rich water tunnel is achieved by means of the small cavity diameter and the large-slope drainage hole which are formed through a directional drilling and hole expanding technology by water in the tunnel and matched with the middle parallel pilot pit, and safety and stability of the tunnel structure are ensured.

Description

【Technical field】 [0001] The invention relates to the technical field of tunnels and underground engineering in the civil engineering industry, in particular to an antifreeze drainage structure and method for high-altitude severe cold water-rich tunnels. 【Background technique】 [0002] The investigation of the use of railway and highway tunnels in cold regions in my country, Europe, America, Japan and other countries shows that the main difficulty in building tunnels in cold regions is the antifreeze and antifreeze problem of tunnels. According to recent statistics from the Japan Highway Corporation and the Japan Railway Comprehensive Technology Research Institute, 1,100 of the 3,800 railway tunnels in Japan are endangered to driving safety during winter operations due to freezing damage; among road tunnels, only 302 large tunnels in Hokkaido There are 104 road tunnels with serious frost damage. To eliminate side wall ice and arch icicles, as one of the remediation measures,...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-freeze drainage structure and method for permanent combination of high-altitude severe cold and rich water tunnels, so as to solve the problem that the drainage system of high-altitude severe cold and rich water long tunnels is not smooth in winter, and the accumulation of water behind the lining causes frost heave and affects the use. The problem

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