Intelligent temperature-control anti-freezing bridge deck

Abstract

The invention discloses an intelligent temperature-control anti-freezing bridge deck, wherein the bridge deck is paved with a thermal insulation layer; a lower layer of concrete is cast on the thermal insulation layer; the lower layer of concrete is paved with steel pipes; the steel pipes are paved with reinforcing steel bars and pre-buried with a bridge deck temperature sensor, and then an upper layer of concrete is cast; the steel pipes are provided with electric-heating wires; the two ends of each steel pipe are sleeved in a steel slot; and a temperature controller is arranged on connection wires of the electric-heating wires. The intelligent temperature-control anti-freezing bridge deck is simple in operation, and does not interfere the bridge deck structure; the heating wires cannot be extruded out of the bridge deck paving layer because of the paving of the concrete or the moving of a vehicle flow so that the heating wires can be effectively protected and is convenient to maintain; meanwhile, the predictability is strong so that the road slippery caused by low-temperature icing can be timely prevented; and the on-off of a switch can be controlled by a temperature sensing system without operation by staff, therefore the switch of a heating device can be automatically turned on and off so as to realize the effective use for whole day.

Description

technical field [0001] The invention relates to an antifreeze bridge deck. Background technique [0002] With the increasing development of our national economy, our country's road traffic system is becoming more and more perfect, and there are more and more bridges in the road network. Roads are the economic lifeline of a country. The smoothness of roads is inseparable from economic development and people's basic life, and bridges are the throats of roads. Cold, rainy and snowy weather can easily cause the road surface to freeze, especially the bridge deck, because the bridge deck is water or suspended, and the temperature is usually lower than that of the road. In particular, traffic accidents caused by icy and slippery bridge decks have seriously affected the smooth flow of roads and driving safety. According to statistics, about 15% of traffic accidents are related to road snow, which not only causes heavy casualties, but also causes traffic jams and aggravates the traf...

AI Technical Summary

Problems solved by technology

But the current heating cables are all imported, which are expensive, inconvenient to maintain, and the quality of domestic products has not yet passed the test, and the heating cables must not touch each other, cross or overlap at any place, which will cause the heating cables to overheat In addition, the cable is laid under the bridge deck. With the damage of the bridge deck, the cable is easy to break. A separate transformer is set up for power supply. The utilization rate of the transformer is not high, and it is idle most of the time. The project cost is too high

At present, a new material for electrothermal deicing and snow melting-conductive concrete has been proposed, but there are two key issues in the research and application of conductive concrete, which need to be further studied and solved: 1) for granular or powdery graphite powder, carbon Conductive materials such as powder, coke and steel chips, due to their small aspect ratio, when the dosage is small, the conductive materials are difficult to contact each other and cannot form a good conductive network, so their conductivity is poor; when the dosage is large, On the one hand, due to the low strength of carbon black, coke, etc., on the other hand, due to the water absorption of conductive materials, the water demand during concrete mixing will be increased, and the strength of concrete will be greatly reduced, which is difficult to meet the needs of civil engineering for mechanical strength.

For carbon fiber, although the conductive network can be formed when the dosage is low, the electrical conductivity is low due to the small contact surface of the fiber lap, and the conductive performance needs to be improved by increasing the dosage of the fiber.

Excessive fiber content will make the fibers agglomerate and form bundles during stirring, making it difficult to disperse; a large number of air bubbles will be easily introduced during molding, which will reduce the strength of concrete

As for the steel fiber, due to its thicker diameter, when the fiber content is low, it is difficult to form an overlapping conductive network, and the conductivity is poor; but when the fiber content is high, its workability is poor, and it is difficult to use conventional methods. construction

Therefore, it is difficult for the currently researched conductive concrete to take into account the requirements of both mechanical and electrical properties.

2) The cost of conductive concrete is generally higher

The above two factors seriously restrict the popularization and application of conductive concrete in practical engineering.

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