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Long-time shutdown construction method for water-rich sand layer shield

A construction method and technology of water-rich sand layer, which are applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of surface subsidence, shield subsidence, etc., so as to ensure surface subsidence, facilitate recovery construction, and increase soil mass. The effect of stability

Inactive Publication Date: 2021-03-19
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] During the construction of the shield machine, due to some uncertain factors, it will often stop and wait. Because the quality of the shield machine is very large, it is very easy to cause construction risks such as ground subsidence and shield sinking during shutdown in such weak geology.

Method used

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  • Long-time shutdown construction method for water-rich sand layer shield

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Embodiment Construction

[0022] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] Such as figure 1 As shown, a long-time shutdown construction method of a water-rich sand layer shield comprises the following steps:

[0024] S1. Pressure setting when the shield machine reaches the stop position;

[0025] S2. Bentonite is injected into the soil bin to increase the stability and flow plasticity of the soil in the soil bin;

[0026] S3, the soil around the shield is injected with bentonite to increase the stability of the soil around the shield;

[0027] S4. Perform secondary supplementary grouting at the t...

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Abstract

The invention relates to the technical field of shield construction, in particular to a long-time shutdown construction method for a water-rich sand layer shield. The method comprises the following steps that S1, the pressure of a shield tunneling machine reaching a stop position is set; S2, bentonite is injected into the soil bin; S3, bentonite is injected into a soil body around the shield shell; S4, secondary supplementary grouting is conducted on the shield tail position, and a water stop hoop is formed; S5, the shield is pushed by 3 cm to 5 cm; S6, after the shield machine stops, pumpingshield tail grease; and S7, earth surface monitoring is conducted every day, and shield shutdown is completed. By means of the method, the influence of soft geology on long-time shutdown of the shieldis avoided, it is guaranteed that shield construction meets the design requirement, and construction recovery of the shield tunneling machine is facilitated. The method is mainly applied to the aspect of long-time shutdown of the water-rich sand layer shield.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, and more specifically, relates to a long-time shutdown construction method of a shield tunnel in a water-rich sand layer. Background technique [0002] The shield tunneling method has been widely used in the field of tunnel construction in my country. With the rapid development of urban rail transit, a large number of cities in coastal areas such as East China and South China have begun to use the shield method for subway tunnel construction. There are generally weak strata in coastal areas, such as special geology such as silt and muddy soil, and the groundwater is extremely rich due to the geographical location. [0003] During the construction process of the shield machine, due to some uncertain factors, it will often stop and wait. Due to the huge mass of the shield machine host, it is very easy to cause construction risks such as ground subsidence and shield sinking during shutdown...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06E21D9/00E21D11/10E21D11/38
CPCE21D9/06E21D9/0635E21D9/001E21D11/105E21D11/38
Inventor 张德强李自力曹志勇王利军闫希东陈学文
Owner CHINA RAILWAY 12TH BUREAU GRP
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