Tunnel lagging jack and construction method thereof

Abstract

The invention discloses a tunnel lagging jack and a construction method thereof, and relates to the technical field of tunnel engineering composite lining construction. The tunnel lagging jack comprises a plurality of segmental lagging jacks, the segmental lagging jacks are connected to form the tunnel lagging jack, each segmental lagging jack is of a tubular structure, a connecting plate is arranged at the end part of the joint of every two segmental lagging jacks, and the segmental lagging jacks are connected through the connecting plates; and corrugated pipes penetrate into pipes of the tunnel lagging jack, prestress steel wire bundles penetrate into the corrugated pipes, and concrete is poured between the outer walls of the corrugated pipes and the inner walls of the segmental laggingjacks. The tunnel lagging jack is made of steel pipes, so that the strength and rigidity of the lagging jack can be effectively improved; concrete is injected into the steel pipes to further improve the strength and rigidity of the steel pipes; meanwhile, the corrugated pipes and prestress steel wire bundles can be arranged in the steel pipes, prestress is provided for the whole lagging jack, andthen the strength and rigidity of the tunnel lagging jack are further improved; and by the adoption of the tunnel lagging jack construction method, construction is orderly, and the construction periodis shortened.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering composite lining construction, in particular to a tunnel arch frame and a construction method thereof. Background technique [0002] With the continuous expansion of the scale and speed of road traffic construction in our country, tunnel engineering has become one of the very important construction links. During the tunnel construction process, it is necessary to use steel arches for the initial support of the tunnel. To ensure the safety and stability of the construction, it is necessary to ensure the strength of the steel arch. [0003] The traditional steel arch has two structures, one is a semi-circular steel arch, and the other is a circular arch straight wall steel arch. The round arch straight wall steel arch frame is generally composed of three steel brackets, that is, the top semicircular bracket and the vertical side wall brackets on both sides. The specifications of the top...

AI Technical Summary

Problems solved by technology

The one-piece steel arch frame is more complicated to manufacture, and it is more difficult to store and transport. Special equipment is required for transportation and erection when splicing.

In the spliced ​​steel arch frame, there will be a problem that the adjacent arch brackets are not tightly spliced ​​due to insufficient arc and verticality of the arch brackets, which reduces the supporting effect.

[0004] The above two types of arches cannot guarantee sufficient rigidity to support the pressure of the vault in the ultra-high ground stress area of ​​the tunnel or the extremely broken rock mass area of ​​the shallow buried section, and often have certain limitations.

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