SU1763571A1 - Device for freezing upper layer of soil - Google Patents

Abstract

Use: accelerate the formation of the carrier layer on weak soils, mainly roads, during the period of negative air temperatures. SUMMARY OF THE INVENTION: An overlap with vent holes is located above the ground surface. The coating is made triangularly in cross section of a cloth stretched over three rows of support that forms cooling channels between the outermost rows of supports. The intake vent holes are located in the cooling channels, and the outlets are located in the upper part of the ceiling along the middle row of supports, the height of the latter is determined by the proposed mathematical dependence. Mathematical dependence is given. 2 Il. W W YO

Description

The invention relates to the construction and can be used in the construction of roads on weak soils in areas with negative air temperatures.

A known road, built on permafrost soils, includes an embankment located on the surface of the soil, triangular cross-section cooling channels with insulating pads, parallel to the axis of the road on both sides of the embankment and connected by strapping, and the floor.

The disadvantage of this design is its late commissioning on weak soils due to slow natural soil freezing and low air circulation.

The closest technical solution chosen as a prototype is a dam comprising

on the surface of the ground is an embankment, a rock layer and a wooden shed with ventilated space.

The disadvantage of this solution is the slow freezing of the base due to the inability to access cold air over the entire surface of the base and its insignificant circulation in the ventilated space.

The purpose of the invention is to accelerate the freezing of the soil.

This goal is achieved by the fact that the device for freezing the top layer of soil, including the overlap placed above the soil surface with the inlet and outlet ventilation holes, is made triangular in cross section of a stretch of three rows of flexible fabric that forms between the end rows support and contacting

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with the ground surface of its edges, the cooling channels, the inlet vent holes are located in the cooling channels at a height not exceeding the height of the extreme supports, and the exhaust holes are located in the upper part of the ceiling along the middle row of supports.

In this case, the height of the supports of the middle row is determined from the dependence

h H h + nT (h + L),

where H is the height of the central support, .m;

h - the height of the extreme support (layer of the mound), m;

L is the distance between extreme supports, m

The proposed technical solution differs from the prototype in that this device is made in the form of a triangular cross section of natrium sodium of a series of supports of a flexible panel that has cooling channels and outlet openings along the middle row of supports between the extreme rows of supports and the edges of the cloth and the height of the supports of the middle row is determined by:

h H h + Vh (h + L) ,.

These differences allow us to conclude that the proposed technical solution meets the novelty criterion. Signs that distinguish the claimed technical solution from the prototype are not identified in other technical solutions when studying this and related areas of technology and, therefore, provide the claimed solution to the criterion of significant differences.

FIG. 1 shows a perspective view of an apparatus, a general view; in fig. 2 is a cross section of a frozen base after backfilling soils.

The device includes a flexible panel 1, spanned by two rows of extreme supports 2 and one row of central supports 3 fixed in the ground 4 and interconnected in rows by jumpers 5, outlet openings 6, suction ventilation shafts 7 with inlets 8 and the vertical supports 9. The edges of the panel 1 are fastened with anchor pins 10.

The device is implemented as follows.

Before the onset of the winter period, two rows of extreme 2 and a series of central, for example, wooden supports 3 fixed to the ground 4, for example, are fixed

bridges 5 along the upper generatrix in each row between each other, tension the flexible panel 1, cut out the exhaust holes 6 along the central row of supports, and

5, between the extreme supports 2 and the edges of the sheet 1, which are in contact with the ground, and anchor pins 10 fixed on each side, install suction ventilation shafts 7.

10 For this purpose, in Hole 1, holes are cut out between the extreme supports 2 and the edges of the cloth, vertical guide racks 9, for example, metal rods, are fastened in the ground and put on them

15 bags of geotextile material and cut the inlet holes 8 into them. Using the obtained ventilation circuit, soil 4 is frozen at the required depth, central supports 3 are removed, for example, they are cut off, and between the extreme supports 2 on a flexible sheet 1 the layer soil 11 to the level of extreme supports 2.

Inequality is obtained from the following 25 considerations.

The purpose of the invention is achieved by creating a ventilation circuit, which will be the case if the exhaust ports b are located above

30 holes 8 of the suction ventilation shafts 7. Therefore, assuming that the holes 8 are at the height of the extreme supports 2, we obtain the condition.

In order to allow air to circulate in the side cooling channels of a triangular cross section, it is necessary to prevent sagging of the cloth or the formation of folds on them after filling the soil on the cloth. For this you need

40 to ensure the tension of the cloth.

Therefore, the length of the cloth between the upper forming extreme supports (points A and B) after pouring soil on it should be less than 2 / h + L.

45 Thus IACI + CB | 2h + L,

those. hypotenuse i AC | 2 h + l h +. Then the height of the central support

50 H I ED I -H DC) h +

+ Vl AC 2 - i AD I2 h + V (h +) 2 -f2

- si-Vh2, 2. . , L2 lf 55 h + h + 2 1 - fT-T h + + h L h + Vh (h + L)

In this way

h h h + vh (h + l)

The movement of air in the device during freezing is shown by arrows in FIG. one.

Example, With the width of the carriageway m and the height of the side supports, 5 m maximum height of the central support should not be more

H 0.5+ V 0.5 (0.5 + 8) 2.6M.

Then the height difference between the openings 8 of the suction ventilation shafts 7 and the exhaust openings 6 will be approximately equal to

Hh 2.1 m

The elevation difference ensures the creation of a ventilation circuit, i.e. the device will be operational.

Thus, the acceleration of the freezing of the soil occurs due to the creation of a ventilation circuit over the entire surface of the base by placing a flexible panel with suction ventilation shafts and outlets along the vertical supports, which prevents the effects of solar radiation and the penetration of snow onto the ground, which, as the heat insulator slows down the freezing process. Thereby significantly increases heat

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ground surface change with cold air.

Claims (1)

The use of this device will allow at the expense of faster freezing of the soil to increase the life of the road on this basis, thereby increasing the period of operation of vehicles in the winter period on special soils. Apparatus of the Invention A device for freezing an upper layer of soil preferably during the preparation of a road base, comprising an overlap with overlapping surface with inlet and outlet air vents, characterized in that, in order to accelerate the freezing of the soil, the overlap is made triangular in transverse a section of a cloth stretched on three rows of supports, forming between the extreme rows of supports and its edges in contact with the ground surface, cooling channels, inlet ventilation pipes They are located in the cooling channels, and the outlets are located in the upper part of the overlap along the middle row of supports, the height of the latter being equal to the value determined from the dependence h Vh (h + L), where H is the height of the support of the average p yes, m ;. h is the height of the extreme support, m; L is the distance between the extreme rows of supports, m. 1