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Method for replacing tail brush in shield tunnel through liquid nitrogen freezing

A technology of liquid nitrogen freezing and shield tunneling, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as complex geological conditions, achieve good water resistance, obvious social and environmental benefits, and good uniformity

Inactive Publication Date: 2012-10-10
CHINA RAILWAY TUNNEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the complex geological conditions at the position where the shield machine is forced to stop, the abundant groundwater and strong pressure bearing capacity in the prior art, so which stratum consolidation water sealing measures are used to prevent the underground pressurized water from entering the tail of the shield, To ensure the safety of shield tail sealing and maintenance, and to ensure the safety of operators, shield equipment and tunnels, a freezing curtain formed by freezing the formation with liquid nitrogen freezing method is provided, which avoids the traditional grouting method in the pressurized and permeable formation. Uncertainty in the treatment of stratum consolidation sealing water, the method of replacing the tail brush by freezing liquid nitrogen in the shield tunnel with the advantages of high strength, good uniformity, and good water resistance

Method used

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  • Method for replacing tail brush in shield tunnel through liquid nitrogen freezing
  • Method for replacing tail brush in shield tunnel through liquid nitrogen freezing
  • Method for replacing tail brush in shield tunnel through liquid nitrogen freezing

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A method for freezing and replacing the tail brush with liquid nitrogen in a shield tunnel hole, such as Figure 1 to Figure 3 As shown, it includes the following process steps: 1. Construction preparation → 2. Freezing hole construction → 3. Installation of freezing system and temperature measurement system → 4. Liquid nitrogen freezing construction → 5. Shield tail seal maintenance construction → 6. Freezing hole plugging Construction → 7. Forced thaw construction → 8. Resume shield tunneling and advance construction.

[0061] The specific steps are as follows: 1. Construction preparation:

[0062] a. Make sure to replace the shield tail brush;

[0063] b. Grouting using shield tail synchronous grouting system;

[0064] Second, the freezing hole construction:

[0065] a. Frozen hole location: determine the location of the frozen hole according to the geographical location of the shield tail brush and the surrounding geological conditions;

[0066] b. Drilling ...

Embodiment 2

[0102] A method for freezing and replacing the tail brush with liquid nitrogen in a shield tunnel hole, such as Figure 1 to Figure 3 As shown, including 1. Construction preparation → 2. Freezing hole construction → 3. Installation of freezing system and temperature measurement system → 4. Liquid nitrogen freezing construction → 5. Shield tail seal maintenance construction → 6. Freezing hole plugging construction → 7. Forced thawing construction → 8. Resume shield tunneling and advance construction.

[0103] The construction process of the freezing hole is as follows: determine the hole position and orifice pipe installation according to the construction drawing of the freezing hole → install the orifice sealing device to ensure the safety of the opening → check and confirm that the orifice sealing device is firmly installed → perform the hole opening operation and drill Freezing hole → After the drilling of the freezing hole is completed, start the installation of the freezin...

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Abstract

The invention relates to a maintenance method for shield equipment and discloses a method for replacing a tail brush in a shield tunnel through liquid nitrogen freezing. The method comprises the following processing steps: 1, preparation of construction; 2, construction of freezing holes; 3, installation of a freezing system and a temperature measuring system; 4, construction of liquid nitrogen freezing; 5, construction of sealing maintenance of a shield tail; 6, construction of formation sealing of the freezing holes; 7, construction of forced thawing; and 8, construction of propulsion of shield recovery. According to the invention, stratum is frozen through a liquid nitrogen freezing method to form a frozen curtain, so that the defect of indeterminacy of a traditional grouting method for carrying out the treatment of stratum consolidation and water sealing to bearing pressure permeable stratum can be avoided; and the method has the advantages of high strength, good uniformity, good water-resisting property and the like.

Description

technical field [0001] The invention relates to a maintenance method for shield tunneling equipment, in particular to a method for freezing and replacing a tail brush with liquid nitrogen in a shield tunnel hole. Background technique [0002] With the increasing maturity of shield construction technology, shield tunnels have been widely used in the construction of urban subways and municipal highway tunnels, especially in the construction of underwater tunnels crossing rivers due to their excellent safety, efficiency and reliability. Slurry shield is widely used. During the shield construction process, the good condition of the shield tail seal performance of the shield is the key link to determine the safety of shield construction personnel, mechanical equipment and tunnels; therefore, in the case of shield tail seal failure, especially in the underwater For tunnels, how to replace the shield tail seal safely and reliably, and how to ensure the reliability of the surroundi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06
Inventor 洪开荣谢文斌王承山张彪何天铭李科郝利军
Owner CHINA RAILWAY TUNNEL
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