Construction method for large-span section loess tunnel under-crossing highway

Abstract

The invention relates to a construction method for a large-span section loess tunnel under-crossing a highway. The construction method comprises following steps: 1) excavating a pipe shed work room at the front portion of the under-crossing segment of the tunnel; 2) installing large pipe shed advance supports in the pipe shed work room; 3) installing small guide tube advance supports at the arch portion of the under-crossing tunnel; 4) hammering vertical glass fiber anchor poles into the construction tunnel face of the under-crossing tunnel for excavation and reinforcement; and 5) excavating and constructing the under-crossing tunnel through a less-section super-short step manner, enhancing construction monitoring and measuring, and timely making preliminary supports and secondary linings. By employing the construction method, the influence on the ground highway by the tunnel excavation can be effectively reduced, the construction progress can be accelerated, a construction technical problem of the large-span section loess tunnel under-crossing the highway is solved, and the security of tunnel construction and the operation of the existing highway are guaranteed.

Description

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AI Technical Summary

Benefits of technology

This new technology helps improve roadways by reducing tunneling while maintaining their strength at an acceptable level for use safely during traffic congestion or accidents involving vehicles travelled through them.

Problems solved by technology

This technical problem addressed by this patented technology relates to the risk posed during constructing tunneling due to changes caused from overlapping road ways with surrounding rocks when crossing an old line without being able to safely go back into it after completion. Existing techniques for creating temporary structures have limitations including complex constructions time required, expensive materials used, difficulty ensuring safe passage of heavy vehicles while maintaining structural integrity.

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