RU2642728C1 - Method of increasing carrying capacity of ice cover - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: carrying capacity of the ice cover is increased by means of steel pipes lowered vertically to the basin bottom through the through openings formed in the ice cover along both sides of the crossing along its entire length, the bottom end of the pipe being made welded and its upper end projecting over the ice surface, the pipes are made as telescopic pillars, wherein the connection portion of the movable element of the telescopic support with the immovable one is covered with an anti-icing layer, and a horizontal vibration generator is mounted inside it. With the help of feedback sensors, the generator is capable of turning to the natural frequency of the horizontal oscillations of the moving element with the ice layer set on it.

EFFECT: increased carrying capacity.

2 dwg

Description

The invention relates to the field of ice engineering and can be used to create an ice ferry for transporting goods.

A technical solution is known (1. Kozin VM, RF Patent No. 2135685 dated 08/27/1999), in which the method of creating an ice crossing consists in placing steel pipes under ice, dropped vertically to the bottom of the pool through the through holes formed in the ice cover on both the edges of the crossing along its entire length, with the bottom end of the pipes made brewed, and its upper end protruding above the ice surface. Cold air, as heavier, enters the pipes, causing ice to freeze over their entire outer surface. After a sufficient time has elapsed for reliable freezing of the lower and upper parts of the pipes to the bottom of the pool and the ice cover, respectively, and the ice layer of the required thickness freezes on the pipe surfaces, the ice crossing is ready for operation.

The disadvantage of this method is the danger of its use with significant fluctuations in the water level in the reservoir, which inevitably occur throughout the winter period. So, when the level rises, detachment of the bottom ends of the pipes can occur, and when they fall, the ice cover itself can be destroyed in places where it freezes to the upper ends of the pipes.

The objective of the claimed invention is the creation of an ice ferry, the bearing capacity of which would not depend on fluctuations in the water level in the reservoir.

The technical result achieved by solving the problem is to increase the degree of reliability of the operation of the ice crossing.

The essential features characterizing the invention:

Restrictive: the load-bearing capacity of the ice cover is increased by means of steel pipes, lowered vertically to the bottom of the pool through the through holes formed in the ice cover on both edges of the crossing along its entire length, the bottom end of the pipe being welded and its upper end protruding above the ice surface.

Distinctive: the pipes are made in the form of telescopic supports, while the connection section of the movable element of the telescopic support with the fixed one is covered with an anti-icing layer and equipped with a horizontal vibration generator capable of tuning to the natural frequency of horizontal vibrations of the moving element with an ice layer frozen on it.

The method is as follows.

Rows of through holes are drilled in the ice sheet on both sides of the intended cargo transportation path. Through them, pipes in the form of telescopic supports are vertically lowered through the ice with one movable and one fixed elements equipped with o-rings to ensure the tightness of the joint, with the welded lower ends and abut them in the bottom of the pool. The length of the supports should be sufficient so that their upper end rises above the surface of the ice sheet. To prevent possible ascent of pipes, they are temporarily fixed.

Then, the ice crossing thus prepared is subjected to negative temperatures. Cold, heavy air (t <0 ° C) enters the pipes, causing ice to freeze over their entire outer surface, i.e. the formation of peculiar ice piles (ice supports) under the ice cover, which will certainly increase the strength of the ice crossing. After a sufficient time has elapsed for the ice layer of the required thickness to freeze on the pipe surfaces, the ice ferry is ready for operation, but only for a given steady-state level of water in the reservoir. Since this level, of course, will fluctuate during the entire period of freezing, in order to maintain the integrity of the ice cover at the places of installation of the supports, the junction of the movable element of the telescopic support with the stationary one is covered with an anti-icing layer. In this section, a horizontal vibration generator is installed inside the support. The generator is equipped with a feedback sensor, with which the vibration frequency is tuned to the natural frequency of horizontal vibrations of the moving element with a layer of ice frozen on it. If during the operation of the crossing due to a significant change in the water level in the reservoir there is a risk of damage, then turn on the horizontal vibration generator with the natural frequency of the moving support element with a layer of ice frozen on it. The presence of an anti-icing layer on this section of the support and a resonant increase in the amplitude of horizontal vibrations of the walls of the support (due to the coincidence of forced and natural frequencies of oscillation and the ability of the generator using the feedback sensor to tune to the natural frequency of the oscillations of the support, depending on the degree of destruction of the frozen layer during the operation of the generator) it will allow to destroy the frozen ice layer precisely in this section and with the least energy consumption.

As a result, the movable support element, having received a vertical degree of freedom, together with the ice cover frozen to it and the ice layer frozen on it will move in the corresponding direction: when the water rises - up; when falling down. After that, the generator power is turned off. Then, due to natural low temperatures, ice will freeze again in this area. Upon reaching the thickness of the frozen layer of ice of sufficient size (strength of the ice pile), which is determined by calculations or experimentally, the ice ferry will be ready for further operation. In the spring, when the operation of the crossing becomes dangerous, the pipes are removed.

The invention is illustrated graphically, where: in FIG. 1 shows a general view of an ice crossing; in FIG. 2 is a section through AA in FIG. one.

In the ice sheet 1, on both sides of the intended route of cargo transportation 2, rows of through holes 3 are drilled. Through them, pipes 4 with welded lower ends are vertically lowered under them and abut against the bottom of the pool 5 (Fig. 1), and pipes 4 are made in the form of telescopic supports with a movable element 6 and a fixed 7. The connection area of the movable element 6 and the fixed 7 is covered with an anti-icing coating 8 and is equipped with a horizontal vibration generator 9, to which a power source 10 is connected (Fig. 2 "a", "b"). When the generator is turned on, the ice layer of thickness h frozen in section 11 is destroyed (Fig. 1, Fig. 2 “b”). As a result, the movable support element 6, together with the ice cover 1 frozen to it and the ice layer 12 frozen on it (Fig. 2 “b”), will move in the corresponding direction (this is not shown in the drawing). Due to the natural low temperatures, the ice layer will re-freeze to section 11. As a result, the ice ferry will be ready for further operation.

Claims (1)

The method of increasing the bearing capacity of the ice cover used as an ice crossing by means of steel pipes dropped vertically to the bottom of the pool through the through holes formed in the ice cover along both edges of the crossing along its entire length, the bottom end of the pipes being welded and the upper end protruding above the ice surface, characterized in that the pipes are made in the form of telescopic supports, while the connection area of the movable element of the telescopic support with the stationary cover anti-cloud a unitary layer and they are equipped with a horizontal vibration generator capable of tuning to the natural frequency of horizontal vibrations of the movable element with a layer of ice frozen on it.

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