A construction method of underground excavation large-span station organized and implemented by section tunnels

Abstract

The present invention provides a method for constructing a large-span underground excavation station organized and implemented by section tunnels, including: S1, excavating along the direction of the station from sections and supporting the conversion channel A; S2, excavating horizontally within the range of the end of the conversion channel A Passageway, and construct portal steel frame, complete construction of the initial buckle arch of the station; S3, break the portal steel frame in the range of conversion passage B in the transverse passage, excavate and support conversion passage B; S4, expand excavation and conversion From passage B to cross passage, complete the bottoming on one side of the large section of the station; S5, backfill and excavate support conversion passage A according to the outline of the station; S6, expand and excavate conversion passage A to the cross passage, and complete the bottoming on the other side of the large section of the station ; S7. Complete the excavation of the remaining parts of the construction station on both sides of the end opposite to the conversion passage at the cross passage according to the double side wall construction method. The solution of the present invention reduces the area of ​​the surface construction site required for construction, reduces the impact of construction on surface traffic, and reduces the amount of earth excavation and cost.

Description

technical field [0001] The disclosure of the invention relates to the technical field of tunnel construction, in particular to a method for constructing a large-span station in underground excavation organized and implemented by an interval tunnel. Background technique [0002] With the continuous advancement of urban modernization, urban transportation resources are becoming more and more scarce, and more and more cities are building subways to alleviate urban traffic pressure. However, the city has the characteristics of complex environment, dense buildings, dense pipelines, and little free space on the ground. Often the subway station is located under the bustling street, the surrounding people gather, the traffic is relatively congested, and the area of ​​the surface construction site is small. [0003] Conventional underground excavation stations use construction passages as the main body of auxiliary tunnel excavation stations. Controlled by terrain, landform, surrou...

AI Technical Summary

Problems solved by technology

[0006] Currently, the main structure of underground excavation stations is excavated using construction passages as auxiliary tunnels. However, subway stations are often located under busy streets, and there is no free space around them for construction passages. If construction passages are not used as auxiliary tunnels, the main body of the station will be excavated. There was not enough excavation face at the time, and currently it is not possible to provide other excavation methods except construction access

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