Super-large variable-section tunnel supporting structure

Abstract

The invention discloses a super-large variable-section tunnel supporting structure. The super-large variable-section tunnel supporting structure comprises a tunnel, a top supporting plate and a bottomsupporting plate, wherein small-sized tunnels are arranged on the two sides of the tunnel; cement piers are arranged inside the small-sized tunnels; the top supporting plate is positioned on the topof the tunnel; the two ends of the top supporting plate are fixedly connected to the tops of the two cement piers respectively; the bottom supporting plate is positioned at the bottom of the tunnel; the two ends of the bottom supporting plate are fixedly connected to the bottoms of the two cement piers; a plurality of supporting frames are mounted between the top supporting plate and the bottom supporting plate; inner cavities are formed in the top supporting plate and the bottom supporting plate; steel frames are mounted inside the inner cavities; grouting ports are formed in one sides of theinner cavities; the inner cavities are grouted with cement mortar through the grouting ports; after coagulation, the cement mortar and the steel frames form a reinforced concrete structure. The super-large variable-section tunnel supporting structure is high in supporting speed, stable in structure and high in construction speed, and is suitable for popularization and use.

Description

Technical field [0001] The invention relates to a tunnel supporting structure, in particular to a super large variable section tunnel supporting structure, and belongs to the technical field of tunnel construction. Background technique [0002] With the continuous development of highway construction in my country, and the gradual improvement of transportation along with economic development, the traditional single-hole two-lane road tunnel can no longer meet the traffic needs. In order to adapt to the construction of multi-lane expressways, many large-section tunnels have been built across the country. The single-hole, four-lane, super-large cross-section and large-span tunnel has very complex structural forces and diversified construction methods. The essence of tunnel excavation and support is the interaction of rock, soil and structure. The parameters of excavation and support should be determined according to the size, shape, force, lining stiffness, characteristics of surr...

AI Technical Summary

Problems solved by technology

Surrounding rocks of ultra-large and variable cross-section tunnels are subject to relatively high pressure. Due to the many transformation processes during construction and the simultaneous excavation of the tunnel, the surrounding rocks will be disturbed many times. Therefore, the surrounding rocks and tunnels are prone to instability and structural damage.

However, the existing tunnel support structure is not conducive to the rapid and stable support of super-large tunnels.

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