Semi-fabricated independent cover arch structure for tunnel zero excavation and tunnel entering and construction method thereof

Abstract

The invention discloses a semi-fabricated independent cover arch structure for tunnel zero excavation and tunnel entering and a construction method thereof. The semi-fabricated independent cover arch structure comprises a hole foundation, a channel steel frame, a cover arch inner ring and a cover arch outer ring, the channel steel frame is fixedly connected to the hole foundation, the cover arch inner ring is fixedly installed on the channel steel frame, the cover arch outer ring is arranged on the outer side of the cover arch inner ring in a pouring mode, the cover arch inner ring comprises a foundation sleeve ring and a splicing sleeve ring, the foundation sleeve ring is fixedly installed on the hole foundation, the channel steel frame is positioned and installed through the foundation sleeve ring, and the splicing sleeve ring is fixedly installed on the foundation sleeve ring with the channel steel frame as a support. Before construction, all components of the independent cover arch structure are prefabricated, and the prefabricated inner ring is small in segmented weight and convenient to hoist and construct; the arrangement of pipe shed guide pipes is more flexible and convenient, and the influence of the annular length of inner ring sections on the positions of the pipe shed guide pipes does not need to be considered in the prefabricating process of the inner ring sections; an on-site concrete spraying construction technology is adopted for the cover arch outer ring, and the integrity, stability and waterproof performance of a independent cover arch formed through the construction method are good.

Description

technical field [0001] The invention belongs to the field of tunnel arch construction, and in particular relates to a semi-assembled independent arch structure and a construction method for zero-excavation tunnel entry. Background technique [0002] With the deepening of the theory and practice of "Two Mountains" and the strengthening of the concept of environmental protection, more and more "zero excavation" tunneling techniques are used in the construction of highway tunnels. This process can minimize the destruction of vegetation, meet the construction principle of "early entry and late exit" of the tunnel, and achieve the effect of environmental protection, beauty and safety. However, under the condition of low and gentle slope terrain, especially when the height of the slope toe is lower than the height of the top of the arch, the conventional tunnel construction generally needs to excavate the slope body first to form a certain height of the slope and strengthen it, an...

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Problems solved by technology

[0007] In view of the above deficiencies, the technical problem to be solved by the present invention is to provide a semi-fabricated independent arch structure and its construction method for tunnel entry with zero excavation, so as to solve the construction problem of rapid tunnel entry, improve construction efficiency, reduce The purpose of production cost and reducing the negative impact on the surrounding environment

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