Main structure for metro long-span station and pillar arching construction method thereof

Abstract

The invention discloses a main structure for a metro long-span station and a pillar arching construction method thereof. The main structure comprises a station interior main structure, a plurality of middle pillars, a middle plate and a main arch part, wherein the station interior main structure is dug; the middle plate is located on the middle pillars; the main arch part is located right above the main structure; a bottom longitudinal beam is arranged at the bottom of the station interior main structure; a top longitudinal beam is arranged on the main arch part; and a middle longitudinal beam is arranged between adjacent middle pillars. The construction method comprises the following steps: 1) preparing in earlier stage; 2) digging a guiding hole and performing primary bracing and bridging construction; 3) constructing the bottom longitudinal beam, the middle pillars and the top longitudinal beam; 4) constructing a primary branch arch and refilling an arch back; 5) performing arch secondary lining construction; 6) digging the upper part of the main structure and constructing a primary branch of a side wall of the upper part; 7) performing secondary lining construction of the middle longitudinal beam, the middle plate and the side wall of the upper part; 8) digging the lower part of the main structure and constructing the primary branch of the side wall of the lower part; and 9) performing secondary lining construction for a base plate and the side wall of the lower part. The construction method provided by the invention has the advantages of reasonable design, simple construction step, convenience in realizing, small construction difficulty and high construction speed.

Description

technical field [0001] The invention belongs to the technical field of subway station construction, and in particular relates to a main structure of a large-span subway station and a column-arch construction method thereof. Background technique [0002] Since 1860, after more than 100 years of subway construction practice, on the basis of continuously absorbing advanced scientific and technological achievements, construction methods have been created to adapt to various surrounding rock conditions and environmental requirements, mainly including open cut method, cover excavation method, drilling method, etc. Explosion method, shallow burial and underground excavation method, shield method, immersed tube method, TBA method and jacking method, although the above construction methods can be effectively applied to the construction of subway stations and have their own advantages, but in the actual construction process All have certain defects and deficiencies in varying degrees....

AI Technical Summary

Problems solved by technology

[0005] 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 stratum is disturbed many times, and there are many unsafe factors; ②The support is complex, 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, serious waste, and high cost; ⑤ "PBA hole pile method" is difficult to guarantee the verticality of the enclosure pile and the center column, which affects the structural force and appearance quality

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