Construction method of large-span subway station main body by using arched cover method and station main body structure

Abstract

The invention discloses a construction method of a large-span subway station main body by using an arched cover method and a station main body structure. The construction method comprises the following steps: 1. making first-phase preparations; 2. excavating main body pilot tunnels at the left side and the right side, and carrying out primary support and top beam construction; 3. excavating a middle-part main body pilot tunnel, carrying out primary support and arch buckling construction, and refilling the earthwork; 4. carrying out earthwork excavation on a main body structure in the station, and prestressing force anchor cable construction; 5. carrying out secondary lining construction on the main body structure in the station; and 6. carrying out secondary lining and arch buckling construction on the station main body. The station main body structure comprises the main body structure in the station, a central post, a central plate and a main body arch part, wherein, the main body arch part comprises a middle arch fragment and two side arch fragments respectively arranged in the two side main body pilot tunnels formed by excavation in advance; and the main body arch part comprises a primary support system and a station main body arch buckling secondary lining structure from the outside to the inside. The station main body structure provided by the invention has reasonable design, simple construction steps, convenience in realization, small construction difficulty and rapid construction speed; the subway station formed by the construction method has a stable structure and a good use effect.

Description

technical field [0001] The invention belongs to the technical field of subway station construction, and in particular relates to a construction method of a large-span subway station main body arch cover method and a main body structure of the station. Background technique [0002] The underground excavation method is generally used for the construction of subway stations. When the underground excavation method is used for the construction of subway stations, the commonly used construction methods include "middle hole method", "side hole method" and "PBA hole pile method". Although the above three construction methods are equally It can be effectively applied to the construction of subway stations and has its own advantages, but in the actual construction process, the above three construction methods all have certain defects and deficiencies in varying degrees. [0003] Among them, the construction process of the "middle hole method" is to first construct the middle hole and ...

AI Technical Summary

Problems solved by technology

[0004] To sum up, in the actual construction process, the above-mentioned "side hole method", "middle hole method" and "PBA hole pile method" all have the following defects and deficiencies to varying degrees: ① There are many pilot holes excavated, many processes, and many blasting times , so the strata are disturbed many times, and there are many unsafe factors; ②The support is complicated, the initial support is removed many times, and the amount of abandoned works is large; ③There are many connection points between the pilot tunnels, and the support system is relatively weak; ④The progress Slow, high cost, and much waste; ⑤ "PBA hole pile method" is difficult to guarantee the verticality of the surrounding protection piles

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