Research on Geothermal Snow Melting using Foundation Piles applied to Bridges

开发了地基桩地热融雪系统仿真软件。融雪模型是基于融雪路面、路面、桩、土、消能管道等之间的热能平衡，该软件可以模拟路面积雪融化、积雪残留、热能储存到土壤中等情况，也适用于多桩系统，其中多桩呈网格状排列，如桥梁的基础桩。为了模拟路面积雪的融化，还考虑了雪层内部的温度分布，使软件能够适用于东北和北海道地区等寒冷地区的积雪融化情况。软件的输入数据如下：集热蓄热桩的尺寸及布置，土壤的构成，铺装路面的尺寸及结构，散热管的尺寸及布置，种类和 ...更多信息 热媒流量、降雨量（包括降雪量）、气温、风速、湿度、太阳辐射、天空辐射等气象数据，软件输出数据如下：路面积雪融化、残雪情况，桩内热媒平均温度，路面平均温度，传递热量，循环泵运行时间，该融雪系统的现场试验已经在中井泉人行天桥、福井市研究中心内的路面和札幌的试验路面进行。模拟结果与现场试验结果吻合较好，验证了所开发的模拟软件的有效性，同时也证明了采用多根桩节距合理的桩节进行季节性蓄冷的可行性，夏季土壤中的热量不会大量散失，冬季可用于融雪作业。在季节的热存储进行了实验验证，并利用新清永大桥正在建设中的设计。少

Simulation software was developed for simulating geothermal snow melting system using foundation piles. The snow-melting model is based on thermal energy balance among snow-melting pavement road surface, piles, soil, dissipation pipes and etc. The software can simulate situations of melting snow and remaining snow on road surface, storage of thermal energy into soil, and etc. It is also applicable to the system with multiple piles, where the many piles are arranged in lattice configuration such as foundation piles of bridges. For simulating snow melting on road surface, temperature distribution inside snow layer is also considered so that the software can apply to snow melting situations for frigid regions such as Tohoku and Hokkaido district.Input data for the software are as follows : dimensions and arrangement of heat collecting and heat storage piles, constitution of soil, dimensions and structure of pavement road surface, dimensions and arrangement of dissipation pipes, kinds and … More flow rate of heat medium, meteorological data such as rainfall including snowfall, air temperature, wind velocity, humidity, solar radiation, sky radiation and etc. Output data from the software are as follows : situations of melting snow and remaining snow on pavement road surface, mean temperature of heat medium inside piles, mean temperature of pavement road surface, transferred heat, operation time of circulation pump, and etc.Field tests of this snow-melting system have been conducted at Nakamaizuru pedestrian bridge, road surface inside Research Center in Fukui city and test road surface in Sapporo. The simulation results are in good agreements with these field tests results, that show validity of the simulation software developed in this research.In addition, the simulation demonstrated possibility of thermal storage during seasons using multiple piles with appropriate pitch, where stored heat inside soil in summer does not dissipate so much that the heat can be applied to snow-melting operation in winter. This thermal storage during seasons was experimentally confirmed and utilized to design of Shin-Kiyonaga bridge under construction. Less