Electric heating method for melting snow and ice on cement concrete bridge floor

Abstract

The invention discloses an electrothermal method for melting snow and deicing on cement concrete pavement, which is characterized in that the method comprises: arranging an electrical heating layer 2-3cm from the pavement, wherein main electrical heating material which is used is 12k or 24k silica gel skin carbon fiber heater wire, adopting parallel connection to pave the carbon fiber heater wire, wherein the distance is 3-10cm, using a reinforcing mesh (or a steel wire mesh) to erect, using zonal steel plates on two ends as electrodes, and fixing the end portion of the carbon fiber heater wire with the electrode through a screw. The working current of the carbon fiber heater wire is no more than 1.8A and the pavement paving power is 250-1000W / m2. A control circuit for deicing and melting snow realizes power on-off control for a circuit according to signals which are returned by a temperature and humidity sensor on the cement concrete pavement, and the temperature and humidity alarming value is regulated according to environment and concrete condition demands to realize power off-on time control. The effects and benefits of the method of the invention are that ice and snow on the pavement can be effectively melted in time, traffic is kept to be smooth, the safety of pedestrians is guaranteed, the cost for constructing, operating and maintaining is low, the thermal transformation efficiency is high, the method is environmental-protective and economic, and the operation is simple, safe and reliable.

Description

technical field [0001] The invention relates to the field of civil engineering, and relates to an electrothermal method for melting snow and ice on cement concrete bridge decks in winter, and the main electrothermal material used is a carbon fiber heating wire. Background technique [0002] At present, countries in the world mainly melt ice and snow by sprinkling salt (NaCl, CaCl2). Soil ecological environment and other issues. Other methods of melting snow and ice include mechanical methods, that is, using manual or mechanical vehicles to complete the process by shoveling and pushing, which requires a lot of manpower, material resources and equipment. The method is to transfer geothermal heat to the surface through pipes, but the disadvantage is the complexity of installing and building heating pipes. Infrared heating lamp method, that is, heating with infrared lamps, because the temperature rise is too slow and affected by the external wind direction; the use of solar en...

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Problems solved by technology

Other methods of melting snow and ice include mechanical methods, that is, using manual or mechanical vehicles to complete the process by shoveling and pushing, which requires a lot of manpower, material resources and equipment. The method is to transfer geothermal heat to the surface through pipes, the disadvantage is the complexity of installing and building heating pipes

Infrared heating lamp method, that is, heating with infrared lamps, because the temperature rise is too slow and affected by the external wind direction; the use of solar energy to melt snow and ice is difficult to construct, high cost and difficult to maintain; using heating cables to melt snow and ice on the road surface, cable costs Higher; there is also steel fiber and graphite mixed into concrete to prepare conductive concrete for melting snow and ice. It is easy to break the tire if it sticks out of the road, which is quite dangerous on the highway or airport. In addition, if the amount of graphite added to the steel fiber graphite conductive concrete is too large, the mechanical properties of the concrete will be affected, and if the amount of graphite is too small, the electrical conductivity will be affected; One kind of conductive concrete is to mix carbon fiber into the concrete. The problem is that the fiber content is too small to meet the conductivity requirements, and too large will easily agglomerate and cannot be dispersed evenly. Moreover, the conductive concrete pavement is deformed and cracked after continuous rolling. It will increase the resistivity and affect the effect of snow melting and ice melting. In addition, the common problem of conductive concrete is that the efficiency of snow melting and ice melting is low.

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