Unprotected open cut excavation subway station shield launching and receiving end backfill and reinforcement method

Abstract

The invention discloses an unprotected open cut excavation subway station shield launching and receiving end backfill and reinforcement method. The method comprises the following steps of backfillingrange measurement, hole door area backfilling, steel pipe pile embedded part manufacturing and installation, anti-floating pressure plate construction, steel pipe pile hoisting installation, undisturbed soil backfilling, platform plate steel bar hoisting and installation, platform formwork hoisting and installation and concrete pouring. According to the construction method, reasonable layout of asteel pipe pile and a platform plate in an unprotected open cut excavation subway station is conducted, bottom space of a foundation pit of the unprotected open cut excavation station is narrow, layered backfill rolling is not facilitated, and settling is difficult to control. Pile plate type hoisting of a platform is conducted, an upper load is directly transferred to backfill concrete by the platform, settlement control is facilitated, the overall stability is better, and shield smooth launching and receiving are guaranteed.

Description

technical field [0001] The invention relates to the field of subway construction, and specifically refers to a method for backfilling and reinforcing the starting and receiving ends of shield tunnels in grading and excavating subway stations. Background technique [0002] In the shield construction technology, before the departure and reception of the subway car with the enclosure structure, it is generally necessary to reinforce the end first, and only after meeting the requirements of the bearing capacity of the foundation and the stability of the soil passing through the stratum can the The next step is construction. [0003] Before the start and reception of the excavated subway station by grading, the two sides of the station structure are foundation pits, which cannot be reinforced by the conventional method. At present, there are two common construction schemes: the first one is to backfill plain soil by layered rolling, and then carry out conventional ground reinfor...

AI Technical Summary

Problems solved by technology

[0003] Before the departure and reception of the excavated subway station by sloping, the two sides of the station structure are foundation pits, and the end reinforcement cannot be carried out in the conventional way

At present, there are two common construction schemes: the first one is to backfill plain soil by layered rolling, and then carry out conventional ground reinforcement measures. This scheme has cumbersome procedures, long construction period, and the quality of backfill reinforcement is difficult to control

The second is to directly backfill the plain concrete at the end to the original ground. Although it meets the requirements of the construction period and soil reinforcement, the cost is too high

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