Construction method of three parallel metro tunnels with ultra-small clear distance

Abstract

The invention discloses a construction method of three parallel metro tunnels with an ultra-small clear distance. The method includes a tunnel portal and open-cut tunnel construction method, a barrel digging method, an explosion method, an advanced small pipe construction method, a steel mesh hanging method, a vertical steel frame erecting method, a combined anchor rod construction method, a primary lining supporting construction method, a tunnel waterproof construction method, a secondary tunnel lining construction method, a pouring method, a geological advanced forecast method and a monitoring and measuring method. Compared with the prior art, the construction method is advanced, reasonable, efficient and concise; on the basis that stability of surrounding rocks, constructed tunnels and surrounding buildings and safety of construction personnel in a construction area are guaranteed, engineering quality is guaranteed, construction cost is effectively lowered, the constriction time is shortened, and social benefits and economic benefits of enterprises are remarkable.

Description

technical field [0001] The invention relates to a subway tunnel construction method, in particular to a construction method for three parallel ultra-small distance subway tunnels. Background technique [0002] With the rapid development of my country's economy, more and more new-line tunnels need to be built with parallel small-spacing tunnels from the beginning, and in order to make full use of the land, the spacing is relatively smaller and smaller, which causes problems caused by excavation and blasting of new tunnels. Vibration and other construction procedures may cause damage to adjacent existing (or previously constructed tunnel) tunnels and surrounding buildings. Due to the small spacing during tunnel construction, the existing tunnel (or previously constructed tunnel) will be blasted. Engineering safety problems such as lining cracking and spalling will occur, which will endanger the safety of personnel, buildings and structures within a certain range of the construct...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of my country's economy, more and more new-line tunnels need to be built with parallel small-spacing tunnels from the beginning, and in order to make full use of the land, the spacing is relatively smaller and smaller, which causes problems caused by excavation and blasting of new tunnels. Vibration and other construction procedures may cause damage to adjacent existing (or previously constructed tunnel) tunnels and surrounding buildings. Due to the small spacing during tunnel construction, the existing tunnel (or previously constructed tunnel) will be blasted. There are engineering safety problems such as lining cracking and spalling, which endanger the safety of personnel, buildings and structures within a certain range of the construction area.

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