Method for formation of ice crossing

FIELD: construction.

SUBSTANCE: method includes freezing of previously stretched steel springs at both sides of the crossing along its length. After its freezing the stretching forces are removed. For freezing of springs into their ice cover they are heated to the temperature above the ice melting temperature by means of electric current sending through ropes. After their submersion into the ice cover for the depth of more than the diameter of the spring, the electric current supply is stopped. The surface of the ice crossing prepared by this surface is exposed to low atmospheric temperatures t<0C to total freezing of water in grooves that occurred during ice melting.

EFFECT: increased load-lifting capacity.

2 dwg

 

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

There is a method of creating a terminal, which consists in Margiani on both sides of the crossing along the entire length of the steel cables, and the cables pre-installed elements rigidly connected to the ropes, before marajuana cables stretch (1. US 4057967 And 15.11.1977, 4 C.; 2. JP 11193581 And 21.07.1999, 7 C.), and to increase the structural strength (terminal) tensile stress relieve (3. Baikov NR. and other Concrete structures. M.: stroiizdat, 1976, p.69-71).

As the closest analogue accepted way to create icy crossing, which consists in Margiani on both sides of the crossing along the entire length of reinforcement in the form of steel cables, and the cables pre-installed elements rigidly connected to the ropes, but before marajuana cables stretch (US 4057967 And 15.11.1977, 4 C.).

The disadvantage of this method is the length of the process of increasing the strength of the ice terminal and the impossibility of providing long-term preservation of the pre-tension of ice in the composition of the ice crossing.

The essence of the invention is to reduce the time to increase the capacity of the ice crossing by simplifying technology reinforced what I ice cover to the prestressing reinforcement and preservation of its increased payload, created preliminary tensile reinforcement.

The technical result obtained by carrying out the invention, is to increase the mass of cargo transported on the crossing.

The essential features characterizing the invention

Restrictive signs: how to create an icy crossing, which consists in Margiani in the ice on both sides of the terminal fittings, which before its Margiani stretch, and after its marajuana tensile stress is removed.

Distinguishing characteristics: the fittings are made in the form of tension springs with a diameter less than the thickness of the ice, and for their marajuana in the ice cover of the spring is heated to a temperature above the melting temperature of ice by passing through the electric current, after their immersion in ice cover to a depth larger than the diameter of the spring flow of electric current stop, the thus prepared surface of ice crossing is exposed to low ambient temperatures (t<0C) to freeze the water in the grooves caused by melting ice.

It is known (4. He D. Experimental investigation of physical-mechanical properties of ice. / Proceedings of TSAGI. - M.: new equipment Bureau, 1947, No. 607, 42 C.), the ice being a viscoelastic material exhibiting the properties of relaxation, i.e. arisen in him supragenerational decrease over time at a constant deformation, and creep, i.e. it over time depending on the load moves its elements relative to each other. Thus, the ice compressive stress due to marajuana it stretched ropes with items (washers) with subsequent removal of the tensile load will decrease, which will not allow for them to maintain a higher load capacity of the ice crossing.

It is also known (5. Mechanics A. Polytechnical dictionary. - Moscow: Soviet encyclopedia. 1980, C)that the spring tension upon termination of tensile load gives her temporarily stored energy when its elastic deformation. From this it follows that, in creating the spring corresponding tensile strain, it is possible for a certain time, depending on the properties of the relaxation of ice, after her Margiani in the ice and relieve tensile stresses to automatically maintain ice-defined compressive stresses, i.e. to preserve the pre-tension reinforcement.

The method is as follows.

On both sides of the ice crossing stack armature in the form of tension springs with a diameter less than the thickness of the ice. Then spring devices load of tensile force and simultaneously heated to a temperature above the melting temperature of ice by propuskanie the through electric current. When lowering the hot springs on the ice they will submerge in ice. When submerged springs at a depth of more than their diameter, the power supply is disconnected. After freezing the melted springs water stress (tensile stress) is removed. In the previously created in the spring tensile forces and forces from the compression of the springs when they are cooled (it is known that by heating the steel expands) in ice cover will have compressive stress. Thus, the ice sheet will be provided pre-tension, which will increase compared to similar its carrying capacity [3]. Increased capacity depending on the magnitude of tensile load determined beforehand on the basis of experimental and theoretical studies. Because ice is showing the properties of the relaxation and creep, over time, increased capacity will start to decrease. However, the accumulated energy of the elastic deformation of the springs will significantly slow down the process. The intensity of this process also previously studied experimental and theoretical methods. If the carrying capacity (payload) ice terminal for transportation on specific goods after a certain time will be insufficient, then the process marajuana springs are repeated in the above described scheme.

The invention is illustrated graphically, in which figure 1 shows a cross-section of the terminal; figure 2 is a longitudinal cross-section, i.e. a section a-a of figure 1

On ice 1 thickness h on both sides of the axis of the terminal stack steel springs 2 diameter d (Fig 1, 2). The ends of the springs 2 are secured on the banks of the terminal using the rods 3 and the steel cable 4, through which with the help of source of electricity 5 serves electric current through the spring 2 to heat them to a temperature above the melting temperature of ice (figure 1). Simultaneously, the spring 2 by means of a loading device 6 and the cable 4 stretch, i.e. create a force N. After the cables due to the melting of the ice will sink into the ice to a depth of h1>d, the power supply stop (figure 2). Then, the thus prepared surface of ice crossing is exposed to low ambient temperatures (t<0C) to freeze the water in the grooves caused by melting ice. After removal of the tensile load N ferry ready for use.

The way to create icy crossing, which consists in Margiani in the ice on both sides of the terminal fittings that before marajuana stretch, and after its marajuana tensile stress is removed, characterized in that the valve is made in the form of springs to grow the program with a diameter less than the thickness of the ice, and for their marajuana in the ice cover of the spring is heated to a temperature above the melting temperature of ice by passing through the electric current, after their immersion in ice cover to a depth larger than the diameter of the spring flow of electric current stop, the thus prepared surface of ice crossing is exposed to low atmospheric temperature t<0C to freeze the water in the grooves caused by melting ice.



 

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