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A construction method for freezing and strengthening shield tail brush replacement

A construction method, shield tail brush technology, applied in metal processing equipment, manufacturing tools, earthwork drilling and mining, etc., can solve problems such as poor freezing effect, achieve the effect of convenient operation, large heat transfer area, and little impact on stability

Active Publication Date: 2022-03-25
CCCC THIRD HARBOR ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat transfer of this freezing and strengthening method is in line contact, and the freezing effect is also poor.

Method used

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  • A construction method for freezing and strengthening shield tail brush replacement
  • A construction method for freezing and strengthening shield tail brush replacement
  • A construction method for freezing and strengthening shield tail brush replacement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0077] The present invention will be further described below in conjunction with accompanying drawing.

[0078] see Figure 1 to Figure 6 , the freezing reinforcement of the present invention to replace the construction method of the shield tail brush, the shield machine has three shield tail brushes, the first shield tail brush 101 and the second shield tail brush 102 and the second shield tail brush 102 and the third shield tail brush 103 form a grease cavity respectively.

[0079] The construction method of the present invention is used to replace the first shield tail brush, including the following processes: before the shield tail brush is replaced and shut down for construction, water stop ring construction, stratum freezing construction, shield tail brush replacement and recovery of excavation;

[0080] The construction process before the shield tail brush is replaced and shut down includes the following steps:

[0081]Step 1: Select the position of the last ring segm...

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Abstract

The invention discloses a construction method for replacing a shield tail brush by freezing and strengthening. Before the shield tail brush replacement and the shutdown construction process, the two-ring segments assembled before stopping the excavation shall be steel tubes with freezing compartments; when the stratum freezing construction process is performed, thermal insulation boards shall be laid on the inner surfaces of the two-rings of the steel tubes first. , and then lay a freezing pipe on the inner surface of each piece of the two-ring steel pipe piece; then connect the brine tank in the freezing equipment with the freezing pipe to form a freezing liquid circulation pipeline, and circulate the freezing liquid through the freezing equipment. The brine in the line is actively frozen. The construction method of the invention can quickly and efficiently form the soil behind the shield tail to form a frozen wall with an average temperature of ≤-8°C and a thickness of more than 0.5m, which can effectively prevent muddy water from entering the interior of the shield machine when the shield tail brush is replaced.

Description

technical field [0001] The invention relates to a construction method for freezing, strengthening and replacing shield tail brushes. Background technique [0002] The shield tail brush is located at the tail of the shield main body and is in close contact with the segment. The annular space formed by several rows of shield tail brushes is filled with grease, which mainly serves as a seal to prevent water, mud, etc. from flowing into the shield along the back of the segment. The function is a sealing measure to prevent sand and mud gushing from the tail of the shield. During the construction of shield tunneling, inevitable abrasion occurs between the shield tail brush and the segments. The service life of the shield tail brush is closely related to the grease injection and the posture of the segment. If it is used normally, the service life is generally 2000m. If the shield machine excavates beyond this distance, the tail brush may fail, causing water and slurry leakage at t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/06E21D11/10E21D11/20E21D11/22E21D11/38E21D11/40E02D3/115C04B28/00B23K9/16B23K9/32B25B11/02B25B27/02
CPCE21D9/0635E21D9/001E21D9/0607E21D9/0609E21D11/105E21D11/20E21D11/22E21D11/38E21D11/40C04B28/00B23K9/16B23K9/32B25B11/02B25B27/026C04B18/08C04B14/06C04B14/104
Inventor 林益剑王利伟王建忠陈细红林双自黄春来
Owner CCCC THIRD HARBOR ENG
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