Shield tunnel-entering construction method at stratum rich in water powder and soil powder sand

A construction method and shield tunneling technology, applied in earthwork drilling, infrastructure engineering, underground chambers, etc., can solve problems such as safety accidents, water gushing and sand gushing, unsuitable for water-rich silt and silt strata, and meet environmental requirements. , the site is small, and the effect of avoiding the risk of water and sand gushing

Active Publication Date: 2013-02-06
CHINA RAILWAY NO 2 ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a safe, reliable and easy-to-organize construction method for the problem that the conventional shield construction method in the above-mentioned prior art is not suitable for water-rich silt and silt formations, and is likely to cause safety accidents such as water gushing and sand gushing. Construction method of shield tunneling in water-rich silty soil and silt sand stratum

Method used

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  • Shield tunnel-entering construction method at stratum rich in water powder and soil powder sand
  • Shield tunnel-entering construction method at stratum rich in water powder and soil powder sand
  • Shield tunnel-entering construction method at stratum rich in water powder and soil powder sand

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Experimental program
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Embodiment

[0046] Embodiment This embodiment is an embodiment of the construction method of shield tunneling in Fuchun Station of the subway

[0047] 1. Construction environment:

[0048] The survey range of buildings along the section is within 2.5 times the buried depth of the top of the tunnel. After investigation, the main conditions of the houses within 50m of the axial direction of the shield tunnel end are shown in Table 1:

[0049] Table 1. Buildings along the route

[0050] serial number

address

storey height

basic form

structure type

Minimum horizontal clear distance (m)

1

Hangzhou Fire Brigade

4

Strip foundation

Brick and mortar

About 17.6 away from the tunnel on the right

2

CIMC Logistics Warehousing Area

1

Strip foundation

Brick and mortar

About 22 from the tunnel on the left

[0051] The ground pipelines at the entrance of the right line of Fuchun Road Station are relatively dense...

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PUM

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Abstract

The invention relates to the technical field of shield construction, and specifically discloses a shield tunnel-entering construction method at a stratum rich in water powder and soil powder sand. The shield tunnel-entering construction method comprises such steps as vertical freezing reinforcement, tunnel portal inspection, tunnel portal chiseling, water and soil backfilling, shield tunnel-entering and the like. The shield tunnel-entering construction method disclosed by the invention effectively balances water-soil pressure inside the tunnel portal ring, grouts to the tunnel to reinforce the soil body on the premise of controlling the risks, and excavates the earth after sufficiently reinforcing and reaching the intensity requirements, so that water and sand gushing which is likely caused by a traditional shield tunnel-entering method is avoided, the construction risk is low, and the construction method is safe and controllable; and moreover, the construction is finished by entering the tunnel twice, and is easily organized.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and in particular relates to a tunneling construction method of shield tunneling in water-rich silt and silt formations. Background technique [0002] At present, there are many options for the entry of earth pressure balance soft soil shield tunnels for subway construction. The main method is to adopt soil improvement methods to meet the conditions of tunnel excavation, supplemented by well point precipitation and water-stop curtains and other measures to prevent the shield machine from leaking water and sand during the tunnel entry process. At the same time, arc-shaped steel plates, shotcrete, and inflatable air bags are used around the door ring to block the gap between the door ring, the shield shell, and the segments. Clearance to realize shield tunneling. [0003] The main idea of ​​the conventional shield tunneling scheme is to adopt a suitable reinforcement method for the portal...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D9/06E21D9/14E21D11/10E02D3/115
Inventor 盛亮卿三惠王家祥陈强陈卓邱秀松
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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