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A Composite Thawing Method

A composite, frozen soil technology, applied in the field of thawing, can solve problems such as delayed construction period and long thawing time, and achieve the effects of timely tracking and monitoring, shortening construction period and saving costs.

Active Publication Date: 2020-05-19
CHINA RAILWAY 18TH BUREAU GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a compound thawing method to solve the problem of long thawing time and delayed construction period in the face of large-volume permafrost choosing natural thawing method

Method used

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  • A Composite Thawing Method
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Embodiment Construction

[0019] Such as figure 1 As shown, a compound thawing method uses a pipe curtain to pre-support the frozen soil. The pipe curtain is composed of 36 numbered steel pipes 1 from No. 1 to No. 36, and the 36 numbered steel pipes 1 divide the frozen soil area. A freezing zone 2, B freezing zone 3 and C freezing zone 4, the numbered steel pipes 1 in the A freezing zone are No. 1-6 and No. 32-36, and the numbered steel pipes in the B freezing zone 1 is No. 7-12 and No. 26-31, and the numbered steel pipe 1 in the C freezing zone 4 is No. 13-25; the specific thawing steps are as follows:

[0020] (1) Start synchronous cleaning of the pipe jacking in the A freezing zone 2 before the construction of the tunnel three-lining structure is completed;

[0021] (2) After the construction of the three-lined structure is completed, the freezing zone 2 of A is forced to thaw, the freezing unit in the freezing zone A is turned off, and the circulating hot brine is turned on for thawing. The outlet...

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Abstract

The invention discloses a composite unfreezing method. According to the method, frozen earth is pre-supported by the aid of a pipe curtain, the pipe curtain comprises 36 numbered steel pipes which arenumbered from first to thirty-sixth, a frozen earth area is divided into a frozen area A, a frozen area B and a frozen area C by the 36 numbered steel pipes, the number of the numbered steel pipes inthe frozen area A is from first to sixth and thirty-second to thirty-sixth, the number of the numbered steel pipes in the frozen area B is from seventh to twelfth and twenty-sixth to thirty-first, top pipes in the frozen area A are synchronously cleaned before tunnel three-lining structure construction is completed, circulating heat salt water is started to gradually and forcibly unfreeze the frozen area A and the frozen area C, the frozen area B is naturally unfrozen, detecting of the temperature in earth and monitoring of ground surface subsidence are implemented in unfreezing, and forced ventilation is implemented by the aid of a fan. According to the method, surface subsidence and self-structure subsidence can be effectively controlled, differential settlement of the ground is prevented, a naturally unfrozen mode and a forcibly unfrozen mode are reasonably planned, cost is saved, construction period is shortened, and construction processes can be normally implemented.

Description

technical field [0001] The invention relates to the field of sports tunnel construction, in particular to a compound thawing method. Background technique [0002] With the rapid development of China's economy and the acceleration of urbanization, various forms of tunnels are constantly being constructed. It is inevitable to build tunnels with super large cross-sections and shallow buried tunnels, which is also a huge challenge for modern construction technology. For example, the Gongbei Tunnel of the Zhuhai Link of the Hong Kong-Zhuhai-Macao Bridge is a controlling project of the Zhuhai Link. The underground excavation section is a two-way six-lane tunnel with upper and lower layers, passing through the restricted area of ​​the Gongbei Port. Two working wells are set up. The geological conditions are complex. The surrounding environment is sensitive. In the face of large volumes of permafrost, the thawing method of natural thawing will take too long to thaw, delay the constr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00
CPCE21D9/001
Inventor 潘建立史鹏飞金鑫赵涛刘应亮郭海雄马会力王军
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
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