Recently, the mainland's large-scale low-temperature rain, snow and freezing weather has had a great impact on the Spring Festival transportation, especially the freezing rain, which freezes into ice immediately when it falls on the ground, and puts on a layer of "ice clothing" on the earth in minutes.
What is the impact of freezing rain on traffic travel, and what are the winter highway traffic support technologies? Zhu Baolin, head of the road early warning and disposal technical team of the Ministry of Transport Research Institute, gave a detailed answer.
01
Mechanism of frost rain
Freezing rain is a weather phenomenon seen in early winter or late winter and early spring. When raindrops fall from the sky, a thin layer of crystal clear ice freezes on power poles, trees, vegetation and road surfaces due to the low temperature near the ground, which is called "freezing rain" in meteorology.
The "freezing rain" that condenses on the road surface is the road surface ice. The snow and ice in the south are very different from those in the north, and the south is particularly prone to ice formation because of the high humidity of the air, especially the large amount of fog at night, and the air temperature is slightly below 0°C.
02
The impact of freezing rain on traffic travel
Freezing rain has a great impact on road traffic, freezing rain will cause the road surface to freeze, making the road surface very slippery, seriously affecting driving safety. Vehicles are prone to skidding and even loss of control, increasing the risk of traffic accidents. If the freezing rain lasts longer or is more intense, the road surface may be completely covered, causing traffic disruptions. The impassability of vehicles will bring great inconvenience to people's travel, may bring huge losses to transportation, reduce transportation efficiency, and even threaten the safety of people's lives and property.
03
Freezing rain weather travel protection solutions
Timely and accurate weather warning information in freezing weather has become a necessary condition for transportation management and people's travel. Therefore, the emergency support solution for freezing rain highway should include pavement ice early warning technology and active pavement ice disposal technology.
The overall framework of travel support technology in freezing rain.
01
Pavement ice warning technology
The accurate highway traffic meteorological early warning platform needs to combine the meteorological forecast data of the satellite cloud image of the Meteorological Bureau with the road meteorological information collection data installed on the road to form a highway traffic meteorological service platform integrating monitoring, forecasting and early warning and information release, so as to realize the quantitative and refined highway traffic meteorological service, achieve kilometer-level forecasting and minute-level early warning, and use these early warning information for emergency disposal of highway maintenance operations and public travel guidance.
02
Active pavement ice disposal technology
The disposal technology of active pavement ice condensation refers to the technical method of active intervention or early disposal before the road ices, mainly including ice condensation early warning and automatic disposal system, anti-coagulant ice coating technology, anti-coagulation ice mixture technology, etc.
1. Ice early warning and automatic disposal system
The pavement ice early warning and automatic disposal system is a high-efficiency, energy-saving and low-cost automatic spraying agent automatic spraying system for the pavement ice condensation problems induced by freezing rain and snowfall, which is a high-efficiency, energy-saving and low-cost automatic spraying system for high-risk road sections such as bridges, long longitudinal slopes, tunnel entrances and exits. The front-end acquisition equipment of the system perceives the early warning information of road icing, transmits it to the control center, and the control center analyzes and processes it through early warning, and when the threshold of spraying snow melting agent is reached, the system automatically starts the spraying equipment and sprays liquid snow melting agent to achieve the effect of snow melting and deicing.
2. Anti-coagulant ice coating technology
Pavement anti-condensation ice coating is a kind of pavement functional layer that is brushed or sprayed on the surface of the road, with high adhesion and high wear resistance, and the coating material is a new type of pavement spraying anti-condensation ice material, which is sprayed on the asphalt pavement in the form of manual painting or mechanical sprinkling, and when it rains or snowfalls, the anti-condensation ice coating reduces the surface freezing point of the pavement, which can make the pavement unable to freeze, and achieves the purpose of light snow can not be retained and heavy snow is well removed. Anti-condensation ice coating material technology can be applied to a variety of built pavement, and the application range is wider.
3. Anticoagulant ice modifier technology
The anti-coagulant ice modifier is used to pave the anti-coagulant ice asphalt pavement, and the anti-coalytic ice modifier with the effect of inhibiting freezing is mixed into the asphalt mixture to form a pavement with non-icing function. On the basis of ensuring the reduction of the freezing point of the pavement, the anticoagulant ice modifier adds a slow-release agent and an enhancer to the modifier, which can reduce the loss of the anticoagulant ice modifier in the non-ice condensing season, and achieve the effect of "no loss in summer and self-melting ice in winter", and at the same time, the road performance of the asphalt mixture is fully guaranteed under the action of the reinforcing agent.
There are also other active ice and snow melting technologies such as electric heating de-icing, laser de-icing, phase change materials, as well as conventional early sprinkling of solid snow melting agents for winter road traffic support.
Editor-in-charge丨Xue Caiyun Liao Qian
Audit丨Wang Nan
Submission email: [email protected] Business: 010-64266095