RU2277613C1 - Device for concrete slope consolidation structure heating in winter period - Google Patents

Abstract

FIELD: hydraulic structures, particularly to perform concrete works in winter period.

SUBSTANCE: device comprises concrete heaters and heat insulation means. The heaters have pipe system including parallel perforated pipes laid on concrete mix of dam slope. The perforated pipes are connected to steam-boiler by common channel and are covered with polyethylene film or other insulation means from above. Distance between pipe perforation orifices and perforation orifice dimensions increase in direction from steam inlet point.

EFFECT: increased uniformity of concrete heating over the full area and reduced energy carrier consumption.

2 cl, 5 dwg

Description

The invention relates to hydraulic engineering and can be used in the production of concrete work in the winter or at low ambient temperatures, as well as to reduce the setting time of concrete.

Known monolithic concrete fasteners [1], laid in the lining under a polymer film. The disadvantage of this technical solution is:

- the absence in this method of an additional heat source;

- when using this method does not create a favorable temperature and humidity conditions.

The closest technical solution is the device [2], including concrete heaters and thermal insulation. The disadvantages of this technical solution are the uneven heating of the entire area of concrete laid on the slope of the dam, and the difficulty in using.

The purpose of the invention is to improve the quality of concrete and reduce energy consumption during work.

This goal is achieved by the fact that for heating concrete laid on the slope of the dam, a heating system is provided consisting of perforated tubes parallel to the slope of the dam and connected by a common channel to the steam boiler, while the perforated pipes are covered with a plastic film or other thermal insulation on top.

In winter conditions, when the average daily outdoor temperature is below + 5 ° C, free water freezes, which stops the process of cement hydration, its increase in volume (up to 9%) destroys the structure of concrete. This leads to the fact that after thawing, concrete can no longer gain design strength. It was established that if concrete reaches 30-50% of design strength before freezing, further exposure to low temperatures does not affect its physical and mechanical characteristics. This value of strength is called critical. Depending on the brand of concrete, it is: 50% M for M200, 40% M for M300 and 30% M for M400 and higher.

After filling the dam and planning the slope, gravel preparation is arranged on it. Concrete mix is evenly laid on gravel preparation, which is carefully planned and leveled. After laying the concrete mixture on top, perforated tubes with perforation are laid at a certain distance from each other, from which steam will escape to warm the slope. The distance between the perforated tubes depends on the ambient temperature and will decrease at low temperatures. At the same time, the temperature on the surface of concrete should not exceed 70-80 ° C. The size of the holes and the distance between them can also be changed in order to uniformly heat the slope over the entire area. Therefore, the frequency of their device and the cross-sectional area towards the end can increase. On top of the perforated tubes are covered with a film, which is loaded with weight for a better fit. The heating system is a prefabricated design and is assembled from perforated tubes that are connected using tubular corners. Perforated tubes are put on the tubular corners and screwed on with clamps to improve the tightness of the connection. The steam supplied to the heating system through the supply pipe is generated in the boiler as a result of boiling water by a heat source.

The steam leaving the perforated holes condenses, and the formed excess water flows down the slope. Thus, under the film, a favorable temperature and humidity regime is maintained for the set of concrete strength. As a heat source, you can use any energy carrier: gas, liquid or solid fuel.

In FIG. 1 shows a cross section of a dam with a device for the production of concrete slope mounts in winter; in FIG. 2 - the same, top view; in FIG. 3 - node A in FIG. one; in FIG. 4 - node B in FIG. 2; in FIG. 5 - steam boiler with heating system.

A device for heating concrete sloping fasteners in winter time includes concrete heaters, consisting of a system of perforated tubes 4, parallelly laid on concrete mixture 3 on the slope of dam 1 and connected by a common channel - 8 to the steam boiler 9. The perforated tubes 4 are covered on top with a plastic film 6 or other thermal insulation.

After filling and planning the slope of dam 1, gravel preparation 2 is laid. Concrete mixture 3 is evenly laid on gravel preparation 2, which is carefully planned and leveled. After laying the concrete mixture 3 on top, perforated tubes 4 with perforation 5 are laid at a certain distance from each other, from which steam will escape to warm the slope. The perforated tubes 4 are covered with a plastic film 6 from above. The heating system is a prefabricated structure and is assembled from perforated tubes 4, which are connected using tubular angles 7. Steam is generated in a steam boiler 9 as a result of boiling water 10 with a heat source 11 and fed to the heating system through a pipe 8.

A device for heating concrete slope mounts in the winter is as follows. After filling the dam 1 and planning the slope, gravel preparation 2 is arranged (Fig. 1). To do this, a gravel 2 layer of 20-30 cm thick is sprinkled on the slope of dam 1. Concrete mixture 3 is evenly laid on the gravel preparation, which is carefully planned and leveled. After laying the concrete mixture on top, perforated tubes 4 are laid at a certain distance from each other. The distances between the perforated tubes depend on the ambient temperature. So, in severe frosts, the distance between the perforated tubes is small to ensure sufficient heating. From the perforation 5 (Fig. 3), which have perforated tubes 4, steam will come out to warm the slope. On top of the perforated tube are covered with a film 6 (Fig. 2). Under the film, the vapor condenses, and the formed water flows down the slope of the dam. The size of the perforation and the frequency of their device towards the end can increase to ensure uniform heating of the slant fasteners over the entire area.

The heating system is a prefabricated design and is assembled from perforated tubes that are connected using tubular corners 7. The connection points of the perforated tubes 4 with tubular corners 7 (Fig. 4) can be pulled together by clamps to ensure tightness. Steam is generated in a steam boiler 9 (Fig. 5) as a result of boiling water 10 with a heat source 11 and supplied to the heating system through a pipe 8. A gas, solid or liquid fuel can be used as an energy source.

The steam flow rate can also be controlled by the valve device on the pipe 8.

The proposed technical solution is more efficient and affordable analogues. It allows you to ensure uniform heating of concrete over the entire area, saving energy. The proposed technical solution is easy to create a favorable temperature and humidity conditions for hardening concrete.

Used sources

1. Obrevsky V. Care for monolithic concrete // Hydrotechnics and Land Reclamation 1975, No. 9. - S. 17 (Analog).

2. USSR author's certificate No. 644749, IPC С 04 В 41/30, published on January 30, 1979 (Prototype).

Claims (2)

1. A device for heating concrete slope mounts in the winter, including concrete heaters and thermal insulation, characterized in that the heaters consist of a system of perforated pipes parallel to the concrete mixture laid on the slope of the dam and connected by a common channel to the steam boiler, with perforated pipes on top covered with plastic wrap or other thermal insulation. 2. The device according to p. 1, characterized in that the distance between the holes of the perforation of the tubes and the size of these holes as they move away from the point of entry of steam to the end increase.

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