The method of freezing of soil during construction of underground structures

 

The invention relates to the mining industry and can be used in the construction of underground structures. The method of freezing of soil during construction of underground structures includes the drilling of wells by installing them in freezing columns with liquid coolant, which connect with the tank filled with solid cases with collateral circulations chilled liquid coolant and the selection of the gas component of the refrigerating medium. What's new is that the tank is filled with liquid coolant with providing direct interaction in the reservoir of liquid coolant and solid refrigerating medium and separating a gas component from the liquid coolant. The technical result of the invention consists in reducing the temperature of the coolant and the decrease in terms of soil freezing. Il.

The invention relates to the mining industry, namely the freezing of soil during construction of underground structures.

There is a method of freezing of soil during construction of underground structures, including drilling wells, installing them in freezing columns, cooling of the coolant through the chiller and atrati energy for cooling the coolant and large periods of soil freezing.

The closest in technical essence and the achieved result to the proposed technical solution is the method of freezing of soil during construction of underground structures, including drilling wells, installing them in freezing columns with liquid coolant, which connect with the tank filled with solid cases with circulating chilled liquid coolant for freezing columns and selection of the gas component of the cases [2].

This method is compared with the above allows you to reduce energy costs and to lower the temperature of the coolant to -45 -50...C. However, the freeze date remain significant.

The objective of the invention is to reduce the temperature of the coolant and decreasing term soil freezing.

This is achieved in that in the method of freezing of soil during construction of underground structures, including drilling wells, installing them in freezing columns with liquid coolant, which connect with the tank filled with solid cases with circulating chilled liquid coolant and the selection of the gas component of the refrigerating medium, a reservoir of subsites and solid refrigerating medium and separating a gas component from the liquid coolant.

The drawing shows a schematic diagram of soil freezing.

Freezing the system consists of a tank 1 with two inlet holes 2, 3 for supplying coolant 4 and solid refrigerating medium 5, the ejector 6, the suction nozzle which is located in the upper part of the tank 1, and freezing the network. Freezing the network includes freezing columns 7, connected to the tank 7 through pipelines 8 and pump 9 that is installed at the outlet of the tank 7.

The method of freezing of soil during construction of underground structures is as follows.

Around underground structures at a given distance from it are drilling wells and installing them in freezing columns 7 with liquid coolant, which connect with the tank 7. Then the tank is filled with liquid coolant and solid cases. A direct result of the interaction of a solid refrigerating medium from the coolant sublimating the cases and intensive cooling of the coolant. When this gas component of the refrigerating medium is separated from the liquid coolant through the ejector 6. Then the cooled coolant is supplied by a pump 9 in freezing columns, which is by freezing the network to carry out education ledogorov fencing required thickness.

This method allows to reduce the temperature of the coolant to 70With by increasing the surface area of heat exchange of the coolant with hard cases and to ensure optimum performance of the freezing system, eliminating the presence of the gas component of the refrigerating medium in the liquid coolant. Further lowering the temperature of the coolant causes a significant increase in material costs and negative impact on the environment. By reducing the temperature of the coolant to 70With the timing of soil freezing at the same hydrogeological conditions are reduced in 2-3 times in comparison with the known methods of soil freezing with forced circulation of liquid coolant.

As an example, consider the creation of ledogorov fencing during the construction of a trunk diameter of 6 m at the initial temperature of the soil 12With its volumetric moisture content of 35% and a density of 1800 kg/m3and the heat capacity of 0.3 kcal/(kghail). The distance between the freezing columns equal to 1.1 m as the coolant used trichloroethylene (C2HCl), and as a refrigerating medium solid carbon dioxide. When p - 70Required 4 t/h of solid carbon dioxide. After the extraction of heat from the ambient array of soil and increasing the temperature of the coolant at 3-5To carry out its cooling to a temperature of 70By downloading additional quantity of solid carbon dioxide 0,220 t/h Logrotate fence thickness of 1.2 m formed within 8 days. The duration of soil freezing by known methods under similar conditions when the temperature of the coolant 45C is 17.4 per day.

Thus, using the above method of freezing of soil during construction of underground structures, the duration of soil freezing is reduced by 2.1 times.

Sources of information

1. Shoplik M. N., Meskhidze J. M., Korolev Acting and other underground Construction: a reference guide. M.: Nedra, 1990, S. 132-200.

2. Shoplik M. N., Bad C. A., Nikiforov, K. P., Kiselev Century. N. Perspective technologies of soil freezing in underground construction. // The underground space of the world, No. 4, 2001, S. 28-38 (prototype).

Claims

The method of freezing of soil during construction of underground structures, including drilling squalane hard cases, with circulating chilled liquid coolant and the selection of the gas component of the refrigerating medium, characterized in that the reservoir is filled with liquid coolant with providing direct interaction in the reservoir of liquid coolant and solid refrigerating medium and separating a gas component from the liquid coolant.

 

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EFFECT: increased efficiency of ground cooling around the pile.

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