Anti-frost heaving system for vertical shaft in cold region and construction method of anti-frost heaving system

A construction method and anti-frost heaving technology, which is applied in vertical shaft equipment, sinking, and earthwork drilling and mining, can solve the problems of inconvenient drilling of vertical shaft equipment, difficult construction in permafrost layers, large manpower and financial resources, etc., and achieve good economical and economical performance. The effect of use value, simple structure and strong applicability

Pending Publication Date: 2021-11-02
CCCC SHEC DONGMENG ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The occurrence of thawing and frost heaving will easily lead to the collapse of the wellhead of the shaft and the deformation of the shaft, which will bring some safety problems to the use during the construction process, and even cause some inconvenience to the drilling of equipment around the shaft
[0004] If the permafrost around the shaft is removed, it will take a lot of manpower and financial resources, and the construction will be more difficult when the permafrost is deep

Method used

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  • Anti-frost heaving system for vertical shaft in cold region and construction method of anti-frost heaving system
  • Anti-frost heaving system for vertical shaft in cold region and construction method of anti-frost heaving system
  • Anti-frost heaving system for vertical shaft in cold region and construction method of anti-frost heaving system

Examples

Experimental program
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Effect test

Embodiment 1

[0043] In a cold area, the lowest temperature can reach minus 20°C, and the soft soil layer is perennial seasonal frozen soil layer with a thickness of 5m. In case of thawing and frost heaving, wellhead collapse and deformation may occur, making it unsafe to use.

[0044] For this reason, embodiment 1 provides a kind of frost-heave anti-freezing system of vertical well in cold area, comprises vertical shaft 2 that is arranged in surrounding rock 1; Also comprises partition wall 3; Surrounding; the partition wall 3 is a concrete anti-seepage partition wall, and the strength of the partition wall 3 is C30.

[0045] Such as figure 1 and figure 2As shown, two rings of liquid injection walls 41 are arranged between the separation wall 3 and the shaft, and each ring of liquid injection walls 41 is composed of a number of evenly spaced liquid injection holes 4 arranged near the shaft 2 The distance between the liquid injection wall 41 and the vertical shaft 2 is 1m, and in the li...

Embodiment 2

[0053] Example 2 provides the implementation method of the above-mentioned anti-frost heave structure. The lowest temperature in a certain place can reach minus 20°C all year round. The inventor simulates the environment of minus 20°C indoors, and adjusts the influence of solvents with different mass concentrations on the freezing point of water, and finally determines when When the mass fraction of the alcohol solution is more than 37%, when the mass concentration of the sodium chloride solution is more than 23%, and when the mass concentration of the calcium chloride solution reaches more than 21%, the water will not freeze at minus 20°C.

[0054] Include the following steps:

[0055] Step 1. Start construction when the outdoor temperature is minus 18°C ​​during the low climate period in the cold region. First, mark the positions of the shaft 2 and the separation wall 3, and build the separation wall 3;

[0056] Step 2, excavate the shaft 2, and install several temperature m...

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Abstract

The invention relates to an anti-frost heaving system for a vertical shaft in a cold region and a construction method of the anti-frost heaving system. The anti-frost heaving system comprises the vertical shaft arranged in surrounding rock and a separating wall. The separating wall is arranged in a surrounding mode along the outer part of the outer wall of the vertical shaft in the annular direction. A plurality of liquid injection holes which are dispersed at intervals are formed between the separating wall and the vertical shaft, and cement paste layers are arranged at the bottoms of the liquid injection holes; solvents are injected into the liquid injection holes and are used for reducing the freezing point of water; the solvents diffuse outwards in the liquid injection holes to fill the area between the separating wall and the outer wall of the vertical shaft, a continuous solvent curtain is formed, and the two sides of the solvent curtain make contact with the separating wall and the outer wall of the vertical shaft correspondingly; and the separating wall is used for preventing water diluting solvents in an external environment or further diffusion of the solvents. The anti-frost heaving system is simple in structure, convenient to use, low in energy consumption and good in anti-frost heaving effect, can be used throughout the year after being built once, and has good economical efficiency and use value.

Description

technical field [0001] The invention relates to the technical field of anti-frost heave for shafts, in particular to an anti-frost heave system for shafts in cold regions and a construction method thereof. Background technique [0002] The shaft structure is an important transportation channel and ventilation channel in the mine construction process. [0003] The winter temperature in the plateau cold area can reach minus 30°C, and the soft soil layer on the surface will freeze seasonally when the winter is cold. When the temperature rises seasonally, the soft soil layer around the shaft is prone to thawing and frost heaving. . The occurrence of thawing and frost heaving will easily lead to the collapse of the wellhead of the shaft and the deformation of the shaft, which brings some safety problems to the use during the construction process, and even brings some inconvenience to the drilling of equipment around the shaft. [0004] If the permafrost layer around the shaft i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D7/00E21D8/00E21D1/12E21F17/18E21B47/07
CPCE21D7/00E21D8/00E21D1/12E21F17/18E21B47/07
Inventor 毛锦波赵红刚杨哲李亚隆于海涛陈永刚侯永川李德增张斌斌曾煜张小虎陈立强
Owner CCCC SHEC DONGMENG ENG CO LTD
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