Intelligent control method and control equipment for steam curing of cement concrete

Abstract

The invention discloses an intelligent control method for steam curing of cement concrete. The method comprises a first mode and a second mode which are suitable for concrete curing in warm southern regions in winter and standard concrete steam curing in cold northern regions respectively. The invention further discloses intelligent control equipment for steam curing of the cement concrete. The intelligent control equipment comprises a main machine and at least one auxiliary machine, wherein each of the main machine and the at least one auxiliary machine comprises a steam generator, a steam generator control panel, a safety valve, a steam solenoid valve and a power distribution system, a steam outlet pipe of the steam generator is connected with the safety valve and the steam solenoid valve, an outlet of the steam solenoid valve is connected with a curing shed cover through a steam pipe, and a wireless temperature and humidity sensor is arranged in the curing shed cover; the main machine further comprises a human-computer interaction interface, a central control unit, a wireless temperature and humidity sensor collection terminal and a wireless control switch transmitting terminal. The intelligent control method and equipment have the advantages that scientization, standardization and automation of a concrete steam curing process are realized, human factor influence is reduced, the curing quality is improved, and the service life of the concrete is prolonged.

Description

technical field [0001] The invention relates to the field of steam curing of cement concrete, in particular to an intelligent control method and control equipment specially used for steam curing of cement concrete and soil at engineering construction sites. Background technique [0002] At present, there are two main types of maintenance methods for concrete construction in winter in my country according to regions. One is in the northern severe cold areas, and coal-fired boilers are commonly used to generate steam for concrete maintenance; It is relatively short, and most of them are carried out by simple heat preservation methods, such as using hot water for maintenance or burning briquettes in small coal furnaces for heat preservation and maintenance. The electric heating steam curing method is used in both southern and northern regions, but it is not widely used due to the high power consumption of steam generation (because the steam delivery cannot be adjusted in time ac...

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Problems solved by technology

[0004] Coal-fired steam boilers are used to generate steam. General industrial boilers burn one ton of standard coal to produce 2620 kg of carbon dioxide, 8.5 kg of sulfur dioxide, and 7.4 kg of nitrogen oxides. Such harmful gases are the culprits of PM2.5, and coal-fired boilers are recommended There will be more harmful gases produced by incomplete combustion of the room

At the same time, the coal-fired boiler room built in the large-scale beam field is generally set in a corner of the construction site according to the site layout. The distance of steam transportation is relatively long, and the heat loss along the pipeline is relatively large, generally reaching about 20%. The efficiency of converting coal into heat energy is not high, generally only about 70%, that is, the total heat loss is more than 40%, and the energy waste is huge. However, the cost of setting up coal-fired steam boilers in small beam yards is relatively high, which is uneconomical.

[0005] The hot water watering maintenance used in the southern region requires continuous spraying and heat preservation. The water consumption is large and the heat loss is also large. At the same time, excessive watering can easily cause water stains on the concrete surface and affect the appearance.

[0006] The use of small coal furnaces to burn briquettes for heat preservation and maintenance can guarantee the temperature, and additional measures must be taken to maintain the humidity. At the same time, the carbon monoxide gas produced by insufficient coal combustion and the carbonization reaction on the concrete surface will accelerate the carbonation of the concrete surface and eventually affect the strength of the concrete.

[0007] Ordinary electric steam curing continuously generates steam and transports it to the concrete curing shed. Like the above-mentioned methods, it is necessary to manually monitor the temperature and humidity and adjust the curing measures in time. Once the artificial dry is not timely, the curing temperature is too high or too high. Low or low curing humidity will affect the curing quality of concrete, and the continuous heating of ordinary electric steam without human intervention (especially in cold winter nights) will also lead to overheating curing, not only poor curing quality but also low power consumption. more

[0008] Therefore, it is often unreliable to rely on traditional curing methods for concrete steam curing, which is inefficient, consumes a lot of energy, and the process is irregular, imprecise and unscientific

Often due to improper maintenance, the strength of concrete is low and the temperature and shrinkage cracks are generated, which affects the normal service life of concrete and causes huge economic losses

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