CN102174793A - Intelligent temperature-control anti-freezing bridge deck - Google Patents

Abstract

The invention discloses an intelligent temperature-controlling antifreeze bridge deck. A thermal insulation layer is laid on the bridge deck, a lower layer of concrete is poured on the thermal insulation layer, steel pipes are laid on the lower concrete layer, steel bars are laid on the steel pipes, a temperature sensor in the bridge deck is pre-embedded, and the upper layer is poured. For concrete, there is an electric heating wire in the steel pipe, the two ends of the steel pipe are sleeved in the steel groove, and a temperature controller is arranged on the connection of the electric heating wire. The invention has the following beneficial effects: the operation is simple, it will not affect the structure of the bridge deck, the heating wire will not be squeezed out of the bridge deck pavement layer due to the concrete paving or the movement of the traffic flow, the heating wire is effectively protected and convenient Maintenance; at the same time, it is predictable and can prevent the wet and slippery road surface caused by low-temperature icing on the bridge deck in time; and the temperature-sensing system is used to control the closing of the switch, which can automatically open and close the switch of the heating device without human manipulation, achieving effective all-weather maintenance. use.

Description

Intelligent temperature control and antifreeze bridge deck

technical field

The invention relates to an antifreeze bridge deck.

Background technique

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 traffic accidents. Traffic burden: highways are closed, people's travel is affected, and goods and goods cannot be transported normally, causing huge economic losses. The northern region has a long winter, with nearly five months of freezing in a year, and nearly one month of freezing in the south. From January 1 to 10, 2011, large-scale freezing disasters occurred in Hunan, Hubei, Jiangxi, Guizhou, Sichuan, Yunnan, and Guangxi. Freezing rain occurred in 70 counties (cities, districts) in Guizhou, and traffic accidents occurred in Guiyang from January 1 to 2. 858 cases and 3 deaths; 75 counties and cities in Jiangxi successively had snow or sleet weather, and 3 car accidents occurred within 10 minutes on the Jingwuhuang section of Hangrui Expressway, resulting in 7 deaths; 62 counties and cities in Hunan were frozen, and some Traffic on expressways and national and provincial trunk roads was interrupted. Vehicles in the direction of Guizhou in Hunan were stranded for about 6 kilometers; roads in Yunnan were blocked for tens of kilometers. Unforgettable 20 consecutive days of ice disasters in Hunan and other southern cities during January-February 2008. Water and electricity were cut off. Travelers were trapped at stations or expressways. The traffic was almost paralyzed. The road maintenance staff of the Yiyang Highway Department dispatched all the road maintenance staff, invested more than 500,000 yuan a day in mechanical deicing, sprinkled more than 1,500 tons of industrial salt, and laid more than 64,000 straw bags. Ten thousand urban management personnel in Changsha took to the road to sprinkle the main roads, viaducts, and overpasses in the city. Thousands of tons of industrial salt were laid, tens of thousands of straw bags were laid, and 100,000 tons of salt was sprinkled on the highway in Hangzhou. The economic loss caused by casualties and traffic interruption is even more incalculable.

In order to avoid or reduce such severe impacts caused by freezing disasters, it is urgent to take effective countermeasures. The currently widely used chemical snow melting method (i.e. removing salt or other compounds) has many negative effects: it requires a lot of manpower and resources; Denudation of bridge decks and isolation piers. The use of snow-melting salt has caused serious harm and huge economic losses worldwide, and salt spraying is mainly aimed at ice and snow roads to de-ice the roads. But because the traffic accident great majority that the road surface is icy and slippery occurs at the initial stage of icing on the road surface, sprinkling salt is a remedial measure carried out after the icing on the road surface. Therefore, it is of great practical significance to seek other forms of snow-melting and ice-melting methods. The principle of thermodynamic snow melting method is simple and will not cause pollution, so it has become one of the measures to melt snow and ice on the road. The thermodynamic method used in the research of melting snow and ice on the road surface has experienced the use of geothermal and solar heat storage systems; however, the geothermal method is more complicated to install and build heating pipes, and is limited by geographical conditions. The cost of solar heat storage systems is too high, making These snow-melting technologies are limited in practical engineering applications. Moreover, for the bridge deck, it is even more difficult to use geothermal or solar heat storage for the bridge deck because it is suspended under the bridge. Finding a safe, ideal, and engineering-applicable heat source becomes the key to thermodynamic snowmelting methods. Using heating cables to melt snow and ice can guarantee the heat, which is a safe and reliable means of snow melting and ice melting. 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 Cause damage, in addition the cable is laid under the bridge deck, along 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, it is idle most of the time, and 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. However, if the fiber content is too high, the fibers will agglomerate into 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 meet the requirements of both mechanical and electrical properties. 2) The cost of conductive concrete is generally higher. In particular, conductive component materials such as graphite and carbon fiber are expensive, making their cost much higher than that of ordinary concrete, nearly five times that of ordinary concrete. The above two factors seriously restrict the popularization and application of conductive concrete in practical engineering. Therefore, it is of great practical significance to seek an economical, environmentally friendly, non-polluting, good thermal stability, convenient control, engineering feasibility, and suitable method for bridge decks to prevent snow from freezing.

Contents of the invention

The purpose of the present invention is to provide an intelligent temperature control and antifreeze bridge deck.

The object of the present invention is achieved by the following methods: an intelligent temperature control and antifreeze bridge deck, laying an insulation layer on the bridge deck, pouring the lower concrete on the insulation layer, laying steel pipes on the lower concrete, laying steel bars on the steel pipes, and pre-burying the bridge The in-plane temperature sensor is poured into the upper layer of concrete. There is an electric heating wire in the steel pipe, and the two ends of the steel pipe are set in the steel groove.

The invention has the following beneficial effects: 1) The operation is simple, it will not affect the structure of the bridge deck, the heating wire will not be squeezed out of the bridge deck pavement layer due to the concrete paving or the movement of the traffic flow, and the heating wire will be effectively protected And it is easy to maintain; at the same time, it is predictable and can prevent the bridge deck from being wet and slippery due to low-temperature freezing in time; and the temperature-sensing system is used to control the closing of the switch, which can automatically open and close the switch of the heating device without personnel manipulation, realizing all-weather effective use. 2) It is an active preventive measure, which starts the heating device before the snow freezes to keep the bridge deck above 0°C, instead of passively de-icing the snow after the snow freezes, which can reduce a lot of energy. consumption. 3) This kind of intelligent temperature control and antifreeze bridge deck is equipped with steel grooves at both ends of the heating pipe. The heating wire can be straight or spiral. Anti-cracking of the pavement layer, preventing local deformation and other functions, while protecting the heating wire, preventing the vibration of heavy-duty vehicles during concrete paving, vibrating, rolling and bridge operation, and bridge deck maintenance and maintenance on the heating wire Damaged, protect the heating wire all the way. 4) The temperature sensor in the bridge deck is pre-embedded on the bridge deck, which can sense the temperature in the bridge deck and the environment respectively. Only when the ambient temperature is lower than 0℃～2℃, the heating device will be turned on automatically. When the bridge deck temperature exceeds 2℃ At ~5°C, the heating device is automatically turned off, and the electronic automatic temperature controller connected in series with the heating device is automatically turned on and off according to the temperature set between the bridge deck pavement and the environment, so that the bridge deck is free from snow and condensation ice. 5) If there is a problem with the whole system, it is easy to check and maintain. According to the direction in which the heating pipes are placed, you only need to cut a certain width of concrete on the upper layer of the pavement at both ends of the bridge deck in the longitudinal or horizontal direction, and open the steel channel for easy inspection and maintenance. Heating wires anywhere without affecting normal traffic operations.

Description of drawings

Fig. 1 is the sectional view of intelligent temperature control antifreeze bridge deck of the present invention;

Fig. 2 is the installation structure schematic diagram of steel bar, heating pipe heating wire and steel channel of the present invention;

Detailed ways

As shown in Figure 1 and Figure 2, an intelligent temperature control and antifreeze bridge deck, laying an insulation layer 2 on the bridge deck 1, pouring the lower concrete 3 on the insulation layer 2, laying steel pipes 5 on the lower concrete 3, and laying on the steel pipes 5 Rebar 6, pre-embedded temperature sensor 4 in the bridge deck, pouring upper concrete 7, electric heating wire 8 in steel pipe 5, both ends of steel pipe 5 are set in steel channel 9, and temperature control is provided on the connection line of electric heating wire 8 device 10.

Claims (1)

1. antifreeze bridge floor of intelligent temperature control, it is characterized in that: go up at bridge deck (1) and lay insulation layer (2), in insulation layer (2) cast lower-layer concrete (3), lay steel pipe (5) in lower-layer concrete (3), go up at steel pipe (5) and lay reinforcing bar (6), temperature pick up (4) in the pre-buried bridge floor, layer concrete in the cast (7), Electrothermic wire (8) is arranged in steel pipe (5), and the two ends of steel pipe (5) are enclosed within the steel tank (9), on Electrothermic wire (8) line temperature controller (10) are arranged.

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