Abstract
To prevent the cable sheaths of Er’qi Yangtze River Bridge from freezing under bad weather in winter, which may lead to ice fall and bring traffic safety accidents, a theoretical model and technical scheme of hot air ice melt system for Er’qi Yangtze River Bridge has been proposed. Based on the established heat transfer model for cable sheaths, the characteristics of heat transfer between internal hot air and outdoor environment have been analyzed. Under the condition when the temperature of the end of cable sheath’s outwall is more than 3°C, the range of temperature and speed of input hot air were estimated, which provides a theoretical basis for hot air melt system for cable-stayed bridge sheaths.
Highlights
In recent years, our country’s bridge construction has been developed rapidly
In January of 2018, the cables of the Poyang Lake Bridge has been frozen, and in February, the ice of Anqing Yangtze River Bridge’s tower cables melted and fell to the cars on the bridge; In January of 2019, the Er’qi Yangtze River Bridge and the Baishazhou Bridge in Wuhan appeared freeze and ice melt with fall
The cable sheaths of cable-stayed bridge were frozen with ice fall posed detrimental effect on traffic safety accidents and caused certain social negative influence
Summary
Our country’s bridge construction has been developed rapidly. The cable-stayed bridge is widely built in crossing the river due to its beautiful shape and convenient construction. Thermodynamic calculation of heat transfer model for cable sheath To prevent the cable sheath from freezing, the end temperature of the outer wall of the sheath t should be kept at t 3°C ,so the hot air’s inlet temperature t and wind speed v of entering the sheath was calculated and analyzed.
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