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Rapid construction method for excavation of lower portion of ultra-large cross-section metro station through large arch cover method

A technology for subway stations and super-large cross-sections, applied in underground chambers, earthwork drilling, wellbore lining, etc., can solve problems such as difficulty in guaranteeing construction quality, poor force on joists, etc., achieve small mutual influence, small impact on forming structures, and ensure construction quality effect

Inactive Publication Date: 2018-07-10
RANKEN RAILWAY CONSTR GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a rapid construction method for the excavation of the lower part of the super-large-section subway station with the large arch cover method, so as to solve the problems of poor overall stress of the joist and difficulty in ensuring construction quality

Method used

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  • Rapid construction method for excavation of lower portion of ultra-large cross-section metro station through large arch cover method
  • Rapid construction method for excavation of lower portion of ultra-large cross-section metro station through large arch cover method
  • Rapid construction method for excavation of lower portion of ultra-large cross-section metro station through large arch cover method

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Embodiment 1

[0030] Such as figure 1 , figure 2 as shown,

[0031] Step 1: Excavation of the large arch of the station and construction of the second lining of the arch;

[0032] step two, image 3 Excavation area A1 of the center slot shown in the drawing;

[0033] Step three, Figure 4 As shown, in the A2 area on the left and right sides of the middle part of the excavation section for job hopping, the construction from top to bottom follows the excavation and support;

[0034] step four, Figure 5 As shown, the second lining of the side wall in the A2 area is applied, and the B1 area is excavated; the height between the first floor and the second floor is equal.

[0035] From top to bottom, the slope of each layer increases with depth.

[0036] The first job-hopping slope is 45 degrees.

[0037] When excavating the second layer, the slope of the second job-hopping is 60°.

[0038] step five, Image 6 As shown, in the B2 area on the left and right sides of the middle and lower...

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Abstract

The invention discloses a rapid construction method for excavation of the lower portion of an ultra-large cross-section metro station through a large arch cover method. After an arch cover secondary lining is constructed, the middle and lower portion of the station are constructed by adopting a layered and sectioned quit excavation sequential-excavation mode. The method comprises the specific construction steps that (1), according to the length of the station, the station is divided into multiple sections, and according to the height, the middle and lower portion of the station are divided into multiple layers; (2), a first-layer middle trough is pulled in the first layer of the first section, a first horse mouth quit trough is excavated, then soil on the two sides of the first-layer middle trough are excavated, preliminary supports and side wall secondary linings are constructed, steel supports are erected on the first layer, and construction as that of the first layer is conducted onthe other layers located under the first layer till the first section is excavated to the bottom; and (3), construction of the other sections is conducted as the step (2). According to the method, sectioned quit excavation is conducted, a plurality of operation faces are simultaneously constructed, the construction progress is stepped up while the construction safety is ensured, meanwhile reversely-constructed construction seams are reduced, and the waterproof quality at structural construction seams is ensured.

Description

technical field [0001] The invention relates to the technical field of underground construction engineering, in particular to a rapid construction method for excavating the lower part of a super-large-section subway station with a large arch cover method. Background technique [0002] Super large cross-section underground excavation subway stations are usually constructed by the top-down method in the arch-cover hole or the PBA construction method. These two methods have a high construction safety factor and small settlement deformation, but the construction progress is slow and cannot meet the construction period requirements when the construction period is tight. Moreover, during excavation step by step, the secondary lining structure (waterproof, steel bar, concrete, etc.) that has been constructed will be greatly damaged, which cannot meet the quality requirements, making it more difficult to deal with quality defects in the later stage. [0003] Patent application CN20...

Claims

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Application Information

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IPC IPC(8): E21D13/02E21D11/10E21D20/00
CPCE21D13/00E21D11/10E21D20/003
Inventor 方涛黄朝根刘橙朱黎理陶旭林苏义吴德海
Owner RANKEN RAILWAY CONSTR GROUP
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