Method for vehicle conveying over ice cover

FIELD: movable or portable bridges, floating bridges adapted to convey loads over ice cover.

SUBSTANCE: method to transport vehicle having weight exceeding load-carrying ability of ice cover over ice involves moving vehicle having weight not exceeding load-carrying ability of ice cover at resonance speed; moving vehicle having weight exceeding load-carrying capacity to ice cover line when above vehicle having lesser weight has moved away from ice cover line for distance equal to 2/3 of resonance bending-gravity wave length; initiating above vehicle having larger weight movement with above resonance speed. Resonance bending-gravity wave length is determined from where D is cylindrical stiffness of ice plate, ρ and h - ice density and thickness, g - gravity, H - water body depth.

EFFECT: increased load-bearing capacity of ice cover.

1 dwg

 

The invention relates to letterlike, in particular for operation of the ice crossings when transporting the cargo.

A known way of crossing vehicles on the ice sheet, which consists in increasing the bearing capacity of the ice cover due to construction on it artificial structures (1. Ivanov KI, Peschansky, I.S. Capacity of the ice cover and the device roads on ice. - M. - L.: Glavchev. Mor. path. - 1949. - 182 C.).

A disadvantage of the known solutions is the high cost and complexity of technology implementation.

The essence of the invention is to develop a technology use ice as the ice terminal, increasing its carrying capacity.

The technical result obtained by carrying out the invention, is to increase the mass of cargo transported on the crossing, and the absence of any cost increase its bearing capacity.

The essential features characterizing the invention.

Taotlejatele: the way of crossing vehicles under ice cover.

Distinctive: before driving across frozen vehicle weight of which exceeds the bearing capacity of ice carry out the movement with the resonant speed of the vehicle with a weight not exceeding carrying sposobnosti ice, when removing the specified vehicle from the line of the shore crossing for a distance equal to 2/3 the length of the resonant Flexural-gravity waves (VVM), the crossing take the vehicle weight exceeds the carrying capacity of the ice cover, and begin to move it above the resonance speed, the length of exclusive breastfeeding were pre-determined by the formula

where D is the cylindrical rigidity of the ice plate;

ρ, h is the density and thickness of ice;

g - acceleration of gravity;

H - water depth.

The method is illustrated in the drawing and is as follows.

If you need transportation across frozen 1 (ice crossing) cargo 2, i.e. any vehicle, the weight of which exceeds the bearing capacity of ice, then to the planned place of the transfer means 2 crossing 1 take a lighter vehicle 3, the weight of the ice cover is able to withstand both static and when it is driven with the resonance speed (Cm. 1 and 2. Kozin V.M. Resonance method of destruction of ice cover. The dissertation on competition of a scientific degree of the doctor of technical Sciences in the form of a scientific report. - Vladivostok, IAP, 1993. - 44 S.). Then, the tool 3 bring on the ice cover 1 with the resonant velocity Vp (See [2])that will bring in ice 1 resonance VVM 4. 3 this will be the maximum pitch to the stern, that is, its center of gravity is at the point of inflection of the profile of the VVM 4. When the tool 3 is removed from the shoreline of the terminal 1 by a distance equal to 2/3 of the length of the resonance VVM λpat the crossing of the display means 2 and begin to move with the tool 3 with velocity Vp. When this length is pre-determined by the formula (3. Chasin DOUGLAS Dynamics of the ice cover. - L.: Gidrometeoizdat, 1967. - 216 C.):

where D is the cylindrical rigidity of the ice plate;

ρ, h is the density and thickness of ice;

g - acceleration of gravity;

H - water depth.

As a result, the tool 2 will move to the top of the VVM 4 excited by means of 3. Thus gravity of the vehicle 2 will be balanced not only by the elasticity of the ice and the reaction of the elastic Foundation (Arhimedova forces), but also the dynamic forces of ice and water, aimed at the top of exclusive breastfeeding up. Obviously, with such a method of operation of the ice crossing her capacity at the location of the cargo 2 will increase due to the use of energy excited VVM, which will allow to achieve the stated technical result. The quantitative increase is the capacity of the terminal can be calculated using the well-known (See. Zuev, VA, Kozin V.M. Use of hovercraft for the destruction of the ice cover. - Vladivostok: Publishing house of the FENU, 1988. - 128 S.).

The way of crossing vehicles on the ice sheet, which consists in the fact that before the beginning of the movement of the ice cover of the vehicle, the weight of which exceeds the bearing capacity of ice carry out the movement with the resonant speed of the vehicle with a weight not exceeding the carrying capacity of the ice cover, when removing the specified vehicle from the line of the shore crossing for a distance equal to 2/3 the length of the resonant Flexural-gravity waves, the crossing take the vehicle weight exceeds the carrying capacity of the ice cover, and begin to move it above the resonance speed, the length of Flexural-gravity waves pre-determined by the formula

where D is the cylindrical rigidity of the ice plate;

ρ, h is the density and thickness of ice;

g - acceleration of gravity;

H - water depth.



 

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