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

A technology for subway station and grading excavation, which is applied to filling, underwater structures, infrastructure engineering, etc., and can solve problems such as long construction period, cumbersome procedures, and difficulty in controlling the quality of backfill reinforcement

CN111395364APending Publication Date: 2020-07-10CHINA CONSTR RAILWAY INVESTMENT & CONSTR GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-07-10

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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.
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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...

Examples

Embodiment Construction

[0024] combined with Figure 1~4 , the method for backfilling and reinforcing the starting and receiving ends of shield tunnels in grading excavation for subway stations includes the following steps:

[0025] (1) Backfill range measurement: carry out actual measurement to determine the backfill range;

[0026] (2) Backfill in the portal area: at the end of the foundation pit, backfill in different areas, specifically, backfill plain concrete 1 with one tunnel diameter along the tunnel direction, backfill cement soil 2 with one tunnel diameter to the foot of the slope, and fill to the 1m above the entrance;

[0027] (3) Manufacture and installation of steel pipe pile embedded parts: after backfilling the end area, install the embedded part 3 along the preset position. The embedded part 3 includes a square steel plate 301, and several L Type steel bar 302;

[0028] (4) Anti-floating pressure plate construction: pour a cushion on the surface of the backfill, and bind the steel...