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Construction method for shield entry under complicated working conditions

A technology with complex working conditions and construction methods, applied in underground chambers, earthwork drilling, wellbore lining and other directions, can solve problems such as complex construction conditions and achieve the effect of ensuring safety

Active Publication Date: 2014-03-26
SHANGHAI FOUND ENG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity and particularity of the construction conditions, the conventional shield tunneling construction method can no longer be completed

Method used

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  • Construction method for shield entry under complicated working conditions
  • Construction method for shield entry under complicated working conditions
  • Construction method for shield entry under complicated working conditions

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Embodiment Construction

[0029] The present invention will be further described below with reference to the drawings and embodiments.

[0030] The construction method of shield tunneling under complicated working conditions of the present invention:

[0031] 1. To ensure the smooth entry of the shield into the tunnel and the safety of surrounding buildings and underground pipelines, the entrance of the tunnel shall be reinforced with soil. Such as figure 1 As shown in 2, the soil reinforcement of the shield tunnel entrance gate adopts triple-pipe high pressure jet grouting pile construction (to reduce the impact on the surrounding environment), and the design pile diameter of a row of piles near the ground wall 7 in the shield tunnel entrance reinforcement area is 800mm , The design pile diameter of other parts is 1200mm, adopts plum-shaped arrangement, adjacent piles overlap 300mm. The entrance reinforcement will be implemented in conjunction with the reinforcement of the bottom of the air shaft foundati...

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Abstract

The invention relates to a construction method for shield holing under complicated working conditions. The method comprises the following steps of: 1, strengthening a shield inlet opening; 2, making a shield pass through a wall; and 3, making the shield hole, namely reducing the tunneling speed when a shield machine enters a strengthening area, wherein the tunneling speed is regulated from the original 4cm / min to the range of between 1.0 and 1.5 cm / min, and the pressure of a soil cabin is reduced to 2kg / cm<2> when the shield machine enters the strengthening area by 0 to 2.0m; the pressure of the soil cabin is reduced to 1.5kg / cm<2> when the shield machine enters the strengthening area by 2.0 to 4.0m; the pressure of the soil cabin is reduced to 1kg / cm<2> when the shield machine enters the strengthening area by 4.0 to 5.0m; and the pressure of the soil cabin is reduced to 0kg / cm<2> when the shield machine enters the strengthening area by 5.0m; and supplementing and injecting cement grout through a reserved injected hole of an air shaft bottom plate in time according to the subsidence monitoring conditions of an air shaft when the shield machine enters the bottom of the air shaft for tunneling so as to ensure the safety of the air shaft. By the construction method, the shield can favorably hole, and the safety of surrounding buildings and underground pipelines can be ensured.

Description

Technical field [0001] The invention relates to a shield tunneling construction method, in particular to a shield tunneling construction method under the working conditions of many underground pipelines such as commercial buildings and elevated surroundings, information optical cables, water supply pipes, gas pipes, rainwater pipes, and water supply pipes. Background technique [0002] The shield tunnel section of No. 2 and No. 3 working wells of the first bidding project of the electric power tunnel starts from Hefei Road, Chongqing South Road, Shanghai, and No. 2 working wells along the north-south elevated way via Jianguo Middle Road, Xujiahui Road, Liyuan Road and Xietu Road Luban Road in the south , No. 3 working well, the outer diameter of the tunnel is Φ6200mm, the inner diameter is Φ5500mm, and the fabricated lining segments are assembled through joints; the width of the lining block is 1200mm, the thickness is 350mm, and the tunnel length is 1130 meters. The shield enter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/08E21D11/10E21D11/38
Inventor 李耀良严国仙徐其宝梁东青付才
Owner SHANGHAI FOUND ENG GRP
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