Outer drainage system of inverted arch body of tunnel rich water formation and construction method

Abstract

The invention discloses an outer drainage system of an inverted arch body of a tunnel rich water formation and a construction method. The system is arranged between an initial support of the invert arch and a second lining of the invert arch, and comprises 1-3 double-wall perforated bellows disposed at the bottom of the invert arch. The double-walled perforated bellows are longitudinally disposed,the openings of each of the double-walled perforated bellows serve as water inlets for accumulated water on the bottom of the invert arch, and each of the double-walled perforated bellows is communicated with tunnel ditches for discharging the accumulated water in a pipe into the tunnel ditches; when the number of the double-wall perforated bellows is greater than one, the plurality of the double-walled perforated bellows are arranged side by side and communicated with each other. The method is fast, convenient and easy to operate, forms a complete drainage system between the initial supportof the invert arch and the second lining of the invert arch, largely solves the problem that the accumulated water at the bottom of the tunnel cannot be discharged, prevents the water at the bottom ofthe inverted arch from gathering, and creates a pumping effect that ensures operational quality and safety.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to an external drainage system and a construction method of an inverted vault in a water-rich stratum of a tunnel. Background technique [0002] In the construction of tunnels in water-rich strata in China, there was no specific construction method to deal with the accumulated water at the bottom of the inverted arch of the tunnel in the past. Only relying on management requirements and the responsibility of the construction personnel on site, the water should be drained as much as possible before pouring concrete. As a result, the second lining of the inverted arch cannot be closely attached to the primary branch of the inverted arch during pouring. After the construction of the inverted arch is completed, water is likely to form between the primary branch of the inverted arch and the second lining of the inverted arch, and the water at the bottom...

AI Technical Summary

Problems solved by technology

[0002] In the construction of domestic tunnels in water-rich strata, there is no specific construction method to deal with the accumulated water at the bottom of the inverted arch of the tunnel. Only by management requirements and the responsibility of the construction personnel on site, the water should be drained as much as possible before pouring concrete. As a result, the second lining of the inverted arch cannot be closely attached to the primary branch of the inverted arch during pouring. After the construction of the inverted arch is completed, water will easily form between the primary branch of the inverted arch and the second lining of the inverted arch, and the water at the bottom of the inverted arch cannot be discharged. Deposits between the primary support of the inverted arch and the second lining of the inverted arch will produce a pumping effect during operation, damage the quality of the inverted arch, and seriously affect the safety and quality of the operation stage. At the same time, it will require reciprocating remediation during the operation period, affecting the economic benefits of the operation

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