Underground passage underground excavation method for constructing lining first and then constructing primarily support

Abstract

The invention discloses an underground passage underground excavation method for constructing linings first and then constructing primarily supports. The method comprises the steps that 1, an underground passage is divided into a first pilot tunnel (1) and a second pilot tunnel (2); 2, deep hole grouting is conducted to reinforce a soil body to form an advance support structure (6); 3, the first pilot tunnel and a first primary support structure (11) and a first secondary lining structure (12) of the first pilot tunnel are constructed; 4, a temporary support (4) is erected at the joint of thefirst pilot tunnel and the second pilot tunnel, and a middle partition wall (5) is subjected to pouring; 5, the second pilot tunnel and a second primary support structure (21) and a second secondary lining structure (22) of the second pilot tunnel are constructed; and 6, the temporary support, the middle partition wall and part of the first primary support structure are removed. According to the method, on the premise of ensuring the construction safety and quality, the construction cost of the underground passage is effectively reduced, the construction progress is accelerated, and the disturbance to the periphery is reduced.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to an underground tunnel excavation method in which the lining is first built and then the initial support is made. Background technique [0002] During the construction of underground passages such as subways, highways, railways, pipe galleries, and tunnels, the cross-sectional forms are complex and changeable, such as symmetrical double-arch tunnels, asymmetrical double-arch tunnels, symmetrical triple-arch tunnels, and asymmetric triple-arch tunnels. In the tunnel construction of the existing technology, the new Austrian method is often used for construction. The new Austrian method construction refers to a construction method that combines anchor rods and shotcrete as the main support means. The construction sequence is: excavation → primary support Support → secondary support. However, in the actual construction process, under the influence of factors such as the main structure ...

AI Technical Summary

Problems solved by technology

However, in the actual construction process, under the influence of factors such as the main structure of the underground passage, geological structure, and construction steps, if a safe and reliable construction method is not used, it may not only lead to quality accidents such as over-excavation and leakage during the construction process, Even lead to safety hazards such as landslides

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