Full-section prefabricated lining structure for drilling and blasting method tunnel and construction method

Abstract

The invention provides a full-section prefabricated lining structure for a drilling and blasting method tunnel and a construction method. The lining structure is formed by connecting a plurality of single-ring full-section prefabricated lining structure bodies in the axial direction of the tunnel. Each single-ring full-section prefabricated lining structure body comprises a functional layer, a prefabricated lining arch ring, pedestals and a horizontal bottom beam, wherein the functional layer is arranged on the outer layer of the prefabricated lining arch ring and used for heat insulation, force transfer and / or water resistance, the two ends of the prefabricated lining arch ring are connected to the pedestals, the pedestals are connected to the two ends of the horizontal bottom beam, and a semicircular arch structure is formed. The full-section prefabricated lining structure replaces a cast-in-place secondary lining structure, the construction efficiency of the secondary lining structure in the drilling and blasting method tunnel is improved, the construction cost is reduced, and the mechanical strength of construction is improved.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to a full-section fabricated lining technology for drilling and blasting tunnels. Background technique [0002] The drill and blast construction method has the characteristics of low requirements on the construction site, flexible organization, and easy guarantee of the construction period. It is the main construction method for railways, highways, and subway tunnels. This construction method excavates the rock and soil mass through drilling, charging, and blasting, and then performs primary support and secondary lining. The secondary lining is usually constructed by pouring concrete with formwork on site. In the construction process of the cast-in-place secondary lining under the primary support, there will be problems such as irregular reinforcement binding, poor quality of concrete pouring and maintenance, difficulty in filling the vault during concrete pouring, etc., resu...

AI Technical Summary

Problems solved by technology

[0005] Aiming at one of the deficiencies in the prior art, the object of the present invention is to provide a full-section fabricated lining structure and its construction method for drilling and blasting tunnels, and replace the cast-in-place two The secondary lining structure overcomes the shortcomings and deficiencies in the prior art such as secondary lining concrete cracking, falling blocks, inverted arch cracking and uplift, insufficient vault lining thickness, and large water seepage, and improves the secondary lining structure in drill-and-blast tunnels. High construction efficiency, reduce construction cost, and enhance the degree of construction mechanization

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