SU607882A1 - Soil freezing device - Google Patents

Description

one

The invention relates to the field of construction of various structures on permafrost soils and relates to the construction of devices for freezing soil.

A device for freezing soil is known, comprising a tubular body filled with a single-phase coolant, the lower part of which is located in the soil, and the upper part, representing the heat exchanger, is located above the soil surface and cooled by atmospheric air 11. This device freezes the ground insufficiently efficiently, since the counterflows of the heat-transfer fluid cooled in the above-ground heat exchanger and heated in the underground part mix with each other.

It is also known a device for freezing soil, including underground. the part and the above-ground heat exchanger, filled with a single-phase coolant and made in the form of tubular housings, containing internal pipes separating the counter flows of the coolant 1.

The last known device is closest to the invention. The intensity of the freezing of the soil by this device is determined in particular by the ratio of the surface areas of the above-ground and underground parts of the device. The greater the value of this ratio, the more intense the freezing of the soil.

However, the known device has a significant drawback. The diameter of the tubular housings of the underground and above-ground parts of the device is the same; therefore, the ratio of the areas of their surfaces, and hence the intensity of ground sowing, can be increased only by the height of the above-ground part, which is not always acceptable.

The aim of the invention is to increase the effectiveness of soil freezing.

Claims (2)

This is achieved by the fact that in the soil freezing device, which includes the underground part and the above-ground heat exchanger, are designed as tubular bodies with internal pipes installed in them, the diameter of the body of the above-ground heat exchanger exceeds the diameter of the body of the second half of the device. continuation of the tubular casing of the underground part and provided with channels communicating with the internal pipe of the underground part. On fng. 1 shows the proposed device, a longitudinal section; in fig. 2 - option of making the device in a concrete shell; on fkg. 3 is a section A-A in FIG. 1. The device has a tube 1, the bottom part of which, located in the ground, is the body of the underground part of the device. The upper part of the pipe 1, located above the ground surface, is placed with an annular rupture inside the pipe 2, which is the body of the above-ground heat exchanger of the device. The pipe 1 is closed from the bottom by a plug 3, and the pipe 2 is closed from the top by a plug 4 in which the filling nozzle 5 is fixed. The annular gap between the pipes 1 and 2. closed —bottom annular lid 6. Inside pipe 1, a pipe 7 is placed, forming an annular gap with it. The pipe 7 in the lower part does not reach the TSO of the plug 3, and in the upper part is closed by the plug 8, Below the pipe 8, the cavity of the pipe 7 is connected by radial channels 9 placed in the pipe 2 with an annular gap between pipes 1 and 2. The device is lowered into the pre-drilled well so that the pipe 2 is above the surface of the earth. The device operates in the following way. From the moment when the air temperature becomes lower than the ground temperature, the single-phase coolant in the annular gap between pipes 1 and 2 is cooled through the wall of pipe 2. At the same time, the volume weight of the liquid increases, due to which it begins to move downwards. Income to the annular plug 6, the downward flow of fluid is directed through the social channels 9 into the cavity of the pipe 7, which follows to the bottom of the underground part of the device. At the same time, the upward flow of fluid in the annular gap between the pipes 1 and 7V is heated from the ground through the wall of the pipe 1, the passage between the radial channels 9 reaches the top of the pipe 1 and enters the annular gap between pipes 1 and 2, where it cools again. The device can be used to freeze the soil or as a self-cooling pile foundation, in which pipe 1 is mounted inside reinforced concrete body 1O (see Fig. 2). Advantage. Such a solution consists in the fact that the pipe 1 located in the ground is protected from concrete by the concrete body 10, and the body of the above-ground heat exchanger consisting of the pipe 2 can be finned to increase the intensity of heat transfer to the air. In addition, bearing consoles 11 can be attached to the metal pipe 2 at any height to transfer the load from the structure to the device used as a self-cooling pile, which is especially important for linear structures erected on an uneven ground. The use of the invention allows to significantly reduce the height of the above-ground heat exchanger, which, in turn, reduces the cost and improves the design characteristics of the freezing device. Claims device for freezing the ground, including an underground part and an above-ground heat exchanger, made in the form of tubular bodies with internal pipes installed in them, characterized in that, in order to increase the effectiveness of the freezing of the soil, the diameter of the body of the above-ground heat exchanger exceeds the diameter of the body. and the inner tube of the above-ground heat exchanger is a continuation of the tubular body of the underground part and is provided with radial channels communicating with the inner tube. slaughter the underground part. Sources of information taken into account in the examination: 1, Gapeev S, I. Strengthening of frozen bases by cooling. L., Stroyizdat 1969, p. 18-20. 2. US patent number 322O47O, cl. 1654a, 1965. / 77G7G U / X Uu ./ ig.1