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Excavation method for four-layer subway station foundation pit

A technology for subway stations and foundation pits, which is applied in excavation, infrastructure engineering, water conservancy projects, etc. It can solve the problems that the excavation surface of multi-layer foundation pits cannot guarantee stability, so as to ensure stability, facilitate construction operations, and improve soil quality. The effect of body strength

Inactive Publication Date: 2020-08-25
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for excavating a foundation pit of a four-story subway station to solve the technical problem that the stability cannot be guaranteed in the complex geographical environment of the excavation surface of a multi-layer foundation pit in the prior art

Method used

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  • Excavation method for four-layer subway station foundation pit
  • Excavation method for four-layer subway station foundation pit
  • Excavation method for four-layer subway station foundation pit

Examples

Experimental program
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Effect test

Embodiment

[0029] Embodiment: A kind of excavation method of foundation pit of four-storey subway station, see Figure 1 to Figure 5 , including the following steps:

[0030] (1) Crown beam and first concrete support

[0031] A crown beam is set on the 1200mm ground connection wall of the station enclosure structure, and the size of the crown beam is 1400mm×800mm. The first support of the station is supported by 900mm×800mm reinforced concrete, and the connecting beam is supported by 600mm×600mm reinforced concrete. The 2nd, 3rd and 4th tracks are φ609, t=16mm steel support, the 5th and 6th tracks are concrete waist beams and concrete supports, the size of the waist beam is 1200mm×1000mm, and the supporting beam is supported by 1000mm×1000mm reinforced concrete.

[0032] The crown beam, waist beam and concrete support are supported by bamboo formwork, the steel bars are bound on site, the commercial concrete is transported to the site for pouring, the plug-in tamping device is vibrated...

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Abstract

The invention discloses an excavation method for a four-layer subway station foundation pit. The technical problem that stability cannot be guaranteed in a complex geographical environment of a multi-layer foundation pit excavation face in the prior art is solved. The method comprises the steps that S1, crown beams and first concrete supports are manufactured; S2, a water-reducing well is manufactured, and the water-reducing well comprises a recharge well in a pit and an observation well outside the pit; S3, earthwork is excavated, negative first and negative second floors are constructed by open-cut and continuous construction, and negative third and negative fourth floors are constructed by cover-cut and reverse construction; S4, a foundation pit support is arranged at the gap of earthwork excavation, and the foundation pit support is composed of 1, 5, 6 concrete supports and 2, 3 and 4 steel supports; and S5, a main body structure is constructed, finally the roof is backfilled, andthe foundation pit excavation is completed. The method has the beneficial technical effects that the safety coefficient is high, and the method can adapt to complex landform features.

Description

technical field [0001] The invention relates to the technical field of subway construction, in particular to a method for excavating a foundation pit of a four-story subway station. Background technique [0002] With the rapid development of domestic subway lines, the depth of the stations is also increasing, and some subway transfer stations have reached four floors. As the depth increases, the stability problems of the foundation pit will increase. Moreover, for some sites near water, the soil quality is relatively soft, and nearby residential buildings, etc., have caused complex landform features. In this case, how to ensure the safety of the surrounding environment is the focus of construction. Contents of the invention [0003] The invention provides a method for excavating a foundation pit of a four-story subway station to solve the technical problem in the prior art that the stability cannot be guaranteed in the complex geographical environment of the excavation su...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D17/04E02D29/045E02D29/05E02D19/10
CPCE02D17/02E02D17/04E02D19/10E02D29/045E02D29/05E02D2300/002E02D2300/0029E02D2600/20
Inventor 杨琼鹏胡新朋马斌李卫赵长青张存博吴文娟唐赫
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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