Abstract

Deicing of bridge deck is studied based on ground source heat. In this paper, a COMSOL finite element numerical model is established, it considers the generalized heat flux, convective radiation heat flux and snow melting heat rate as the cold source. The designed pipe spacing of the model is 20cm, 25cm and 30cm respectively. The influence of low thermal conductivity of asphalt bridge deck on deicing effect is considered in the model, and the temperature and stress of bridge deck are simulated, and the relevant data results are obtained. The actual heat flux required for deicing is calculated, and it is concluded that the deicing effect increases gradually with the increase of pipe spacing, but the increase of 20cm spacing is smaller than that of 25cm spacing. 25cm spacing has good effect and is the most economical.

1 Introduction

Bridge icing is a very important problem in winter, which not only causes travel inconvenience, but also traffic obstruction, and even causes a series of traffic accidents. At the same time, the current traditional salt deicing method not only pollutes the environment, causes land salinization, but also easily corrodes the bridge structure, causing greater economic losses1-3. Therefore, it is necessary to carry out green, safe and effective deicing.

Using geothermal energy to deice bridge deck has a good application prospect. Shallow geothermal energy is a clean, sustainable development of new energy, with large reserves, no pollution, no carbon emissions and other characteristics4, has great potential and broad application prospects 5-6. There is a high temperature in the shallow layer of the earth's surface (within 400m underground). It is a natural Solar Geothermal collector, which collects 47% of the solar energy and preserves the gradient temperature increase of the earth. This kind of renewable and pollution-free shallow low-temperature energy is called geothermal energy. Geothermal energy is subject to seasonal changes, and its temperature is very suitable to be used as new energy: compared with cold winter, the temperature of geothermal energy is higher, and in hot summer, the temperature of geothermal energy is lower. Geothermal energy is used as energy supply, which can be directly utilized without heat conversion, and it is a renewable, green, clean and environment-friendly energy 7-9.

This content is only available via PDF.
You can access this article if you purchase or spend a download.