RU2459031C2 - Device to compact snow - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: device comprises a platform with a weight, on the bottom of the platform in the middle along the direction of its displacement there is a skid. The skid represents a wedge with width that is several times less than the width of the platform, with length of the platform and height linearly increasing from zero at the front end of the platform to a certain value, at the rear end of the platform determined using the following formula: The maximum height of the skid = The critical speed of deformation × The length of the platform / The speed of the tractor.

EFFECT: development of snow surface of higher strength on a large area and the possibility to tow a device on loose snow outside a compacted site.

2 dwg

Description

The invention relates to construction equipment and can be used to compact snow. The invention can be applied to the construction of various structures from snow, in particular for the construction of snowy roads, airfields, etc.

Known devices for compacting snow cover, containing trailed rollers [1, 3, 6], loaded trailers, multi-sledges or drag-and-ironers [6]. The disadvantage of these devices is the insufficient strength of the compacted snow, as well as the inability to tow trailed rollers outside the compacted area due to their deep fall into loose snow.

Known snow-sealing machines (snow groomers) [5] containing special sealing mechanisms. The disadvantage of snow groomers is the insufficient strength of compacted snow.

A device for sealing snow cover in the form of a horizontal platform with a load, which drags the tractor, taken by the authors for the prototype. The disadvantage of the prototype is the lack of strength of compacted snow due to the low pressure exerted by the platform on the snow.

The aim of the present invention is the creation of a snow surface of increased strength over a large area and the ability to tow the device on loose snow outside the compacted area.

The technical result of the invention is the inclusion in the platform of the skid located on the bottom of the platform in the middle along the direction of its movement, which is a wedge width several times smaller than the width of the platform, a length matching the length of the platform, and a height linearly increasing from zero on the front end of the platform to a value determined by the average speed of the tractor, at the rear end of the platform. Such a platform provides a low rate of linear deformation of snow at a relatively high productivity, as well as the possibility of towing it on loose snow.

Figure 1 shows a schematic view of the device from the side, and figure 2 is a front view (rear). The diagrams indicate: 1 - platform, 2 - ballast cargo, 3 - skid.

The operation of the device is considered on the example of the construction of a runway (runway) on a snow-covered glacier of Antarctica. A tractor (not shown in the diagram) uniformly moves the platform 1 with the ballast weight 2 over the area to be sealed. Concrete blocks can be used as ballast cargo. The pressure on snow under runner 3 is significantly higher than under the rest of the platform, which increases the strength of snow compacted by runner [4]. Due to the runner linearly projecting under the bottom of the platform, the snow deformation rate under the runner will be uniform, and due to the small wedge angle, the runner’s speed will not exceed the critical strain rate, above which destructive deformation occurs [3], at which the material being compacted is ejected from under the sealing device. Thus, the height of the maximum protruding part of the runner will be determined by the formula:

In [4], it was shown that in order to achieve the best effect in snow compaction, the speed of its linear deformation should not exceed 0.02 m / s. For example, with a tractor speed of not more than 5 km / h and a platform length of 10 m, the protruding portion of the runner at the rear end of the platform will be 0.14 m. After pulling the device along the runway, a rectangular track of compacted snow remains on it. In the opposite direction, the device moves with some shift. As the device is dragged along the runway, ruts first appear on it, which becomes more and more. Gradually, the runway area occupied by the ruts exceeds the area of unconsolidated snow, and protrusions of unconsolidated snow remain on the runway, which are then compacted by the prototype, i.e. platform with cargo.

INFORMATION SOURCES

1. Garanin L.I .; Garanin I.L .; Garanin E.L .; Garanin M.L. Device for sealing snow cover. Patent of the Russian Federation No. 2055102 dated 02.02.1993.

2. Z. Yosida. Physical properties of snow. In Sat: Ice and Snow. Properties, processes, use. Under. ed. W.D.Kinger. M.: Mir, 1966, S.376-423.

3. Mounted RO to the DT-75M tractor for snow compaction. http://sdm.brstu.ru/ftp/diploma/d002/d002_09.jpg

4. S.P. Polyakov, B.V. Ivanov, A.V. Klepikov, V.D. Klokov, V.V. Lukin, V.L. Martyanov. Physico-mechanical properties of the snow-firn coating of the runway at Vostok station in Antarctica. // Ice and snow. - 2010. - No. 1 (109). - S.119-122.

5. Priklonova S., Kozlov A. Ratraki - as an urgent need for modern ski runs. Skiing. No. 37, 2007.

6. Design, construction and maintenance of winter roads in Siberia and the North-East of the USSR. BCH 137-89 of the Ministry of Transport of the USSR, Moscow, 1989.

Claims (1)

A device for compacting snow, including a platform with a load, characterized in that on the bottom of the platform in the middle along the direction of its movement there is a skid, which is a wedge several times smaller than the width of the platform, with a length that matches the length of the platform and a height that increases linearly from zero at the front end of the platform to a value at the rear end of the platform, determined by the formula:

Images