Construction method for enabling subway shield section to penetrate through existing station

Abstract

The invention discloses a construction method for enabling a subway shield section to penetrate through an existing station. According to the method, there is no condition for the construction of pilecutting vertical shafts on both sides of the enclosure structure of the existing station, and there is no condition for setting up a shield maintenance well in a newly-built subway tunnel; a construction vertical shaft is constructed by utilizing a finite space at periphery of the existing station and downwards excavated to the elevation position of the shield tunnel, and then the enclosure structure of the existing station is broken through applying the construction cross channel and the pile cutting channel; and the shield tunnel is temporarily supported by adopting the form of fiberglass ribs and steel bar combination grille support through the section pile cutting channel, and after the breaking of the existing envelope structure is completed, and C15 concrete is used for channel backfilling. According to the method, the difficult problem that the shield penetrates downward through the existing envelope structure, and safety and stability of existing station structures in the construction process are guaranteed; and the damage of a cutter head caused by directly acting on the enclosure structure by the shield can be avoided, the construction risk is effectively controlled, andsafe and normal operation of subway existing lines is guaranteed.

Description

Technical field [0001] The invention relates to a subway engineering construction technology, in particular to a construction method for a subway shield section to pass through an existing station. Background technique [0002] With the rapid development of urban rail transit, the subway has gradually become an important mode of transportation for people to travel. Due to the continuous crossing of the subway network, it has become a common phenomenon for newly-built subway lines to pass through existing operating lines. As an important method for the construction of subway sections, the shield tunneling method is more risky when the shield machine passes through the existing station enclosure and main structure. How to quickly and safely make the shield machine pass through the existing line structure to ensure the safety of the existing line Operation has become a new problem. [0003] The main forms of the existing subway station enclosure structure include retaining piles, un...

AI Technical Summary

Problems solved by technology

[0004] However, due to the long-term operation of some stations, the construction conditions for glass fiber reinforced cast-in-place piles were not available during the original construction, and the enclosure structure is normal reinforced concrete cast-in-place piles. Direct excavation of reinforced concrete cast-in-place piles by shield machines requires high requirements for shield machine cutters. , the cutting speed is slow, the vibration is large, which affects the operation of the existing station, and the construction risk is relatively high, and it is necessary to set up a maintenance well to repair and replace the cutter head in time

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