Arch frame structure of multi-arch tunnel and arrangement method of arch frame structure

Abstract

The invention provides a multi-arch tunnel lagging jack structure and a layout method thereof, and relates to the technical field of multi-arch tunnels, the multi-arch tunnel lagging jack structure provided by the invention comprises a plurality of front hole steel lagging jacks and a plurality of rear hole steel lagging jacks, and each front hole steel lagging jack and each rear hole steel lagging jack independently form a ring; each truss preceding hole steel arch comprises a first lower steel frame used for being buried in a mid-partition wall, each truss following hole steel arch comprises a second lower steel frame used for being buried in the mid-partition wall, and the first lower steel frames and the second lower steel frames are arranged in a staggered mode in the length direction of the mid-partition wall. According to the multi-arch tunnel arch frame structure and the arrangement method thereof, the stress form of the tunnel steel arch frames is changed, the first hole and the second hole of the bias multi-arch tunnel are each provided with the independent ring-shaped steel arch frames, stress is more reasonable, the bearing capacity is large, and the multi-arch tunnel arch frame structure and the arrangement method thereof have the advantages that the structure is simple, cracking is not likely to happen when the multi-arch tunnel arch frame structure is put into operation, safety, reliability and flexibility are achieved, and economic benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of multi-arch tunnels, in particular to a multi-arch tunnel arch structure and a layout method thereof. Background technique [0002] In the construction of high-grade highways, the tunnels are mainly in the form of separate double-holes. However, under some special geological and topographical conditions, multi-arch tunnels must be adopted from the comprehensive consideration of alignment and bridge-tunnel connection methods. The multi-arch tunnel has the basic characteristics of shallow burial, biased voltage and medium length, which can better solve the limitation of the traditional split double-hole tunnel in line shape. Multi-arch tunnels can adapt to more terrains, with high space utilization and low construction cost. Therefore, in the process of expressway construction, multi-arch tunnels have significant advantages over separate double-hole tunnels and have been widely used. [0003] The construct...

AI Technical Summary

Problems solved by technology

[0003] The construction method of the multi-arch tunnel is more complicated than that of the separated tunnel, and its domestic construction level is far behind that of foreign countries. The design is often out of touch. Even if the biased double-arch tunnel is completed through the efforts of the construction personnel, cracks will appear soon after the tunnel is put into operation, making the construction of the biased double-arched tunnel always fail to meet the safety requirements.

In the actual construction of eccentric multi-arch tunnels, the steel arch frame of the backward tunnel is often used to overlap the steel arch frame of the preceding tunnel for support, which is equivalent to acting on the steel arch frame of the preceding tunnel in a concentrated force. However, the above-mentioned stress forms are not conducive to the stability of the tunnel structure, and cannot guarantee the safe construction of the tunnel and the safe operation in the later stage.

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