Ventilation pipe-ventilation block cooling heat-insulating compound roadbed

Abstract

The invention relates to a ventilation pipe-ventilation block cooling heat-insulating compound roadbed which comprises roadbed filling paved on the surface of a natural ground. The compound roadbed is characterized in that ventilation block layers are stacked in the roadbed filling in a staggered manner, ventilation pipes communicated with the outside are equidistantly paved at the top of the ventilation block layers along vertical roadbed strike, an automatic temperature-control air door is mounted at one end or each of two ends of each ventilation pipe, and a heat-insulating material is paved above each ventilation pipe. Through innovation of a convection heat exchange structure, heat exchange of the roadbed is changed into one-way heat exchange in cold seasons, power and cooling efficiency of a heat exchange layer are improved manyfold, and engineering adjustment and control effect is improved remarkably. Stability of permafrost roadbeds is improved substantially, the problem in constructing highways is solved outstandingly, and long-time safety and stability of permafrost engineering are guaranteed.

Description

technical field [0001] The invention relates to the technical field of permafrost engineering, in particular to a ventilation pipe-ventilation block composite subgrade for cooling and heat insulation. Background technique [0002] Permafrost refers to soil and rocks with negative temperature and ice. The distribution area of ​​permafrost in my country is about 2.15 million square kilometers, accounting for about 22% of the country's land area, ranking third in the world. It is mainly distributed in the Qinghai-Tibet Plateau, Northeast China, Xiaoxing'an Mountains, Tianshan Mountains, Altai Mountains and other regions. With the continuous acceleration of national economic construction, various transportation facilities are constantly being built in these special areas, such as Qinghai-Tibet Highway, Qinghai-Tibet Railway and other major national projects. However, due to the existence of ice and unfrozen water in the frozen soil, and it is extremely sensitive to temperature, ...

AI Technical Summary

Problems solved by technology

Although it can play a certain role in cold and heat insulation, there are still many deficiencies.

First of all, the natural environment of desertification on the Qinghai-Tibet Plateau and the frequent sandstorm conditions will cause the natural sandstorm to enter the rock layer through the holes on the ventilation pipe, and gradually lead to the loss of the efficiency of the entire heat exchange layer during the continuous accumulation process; secondly, Due to the limitations of site conditions and construction conditions, the natural porosity of the block stone layer often fails to meet the requirements of convective heat transfer, resulting in a decrease in heat transfer efficiency, making it difficult to meet the cooling requirements; The non-closed structure and the strong heat exchange mechanism between the through-wall ventilation pipe and the block stone layer will cause heat to quickly enter the heat exchange layer in warm seasons, causing a rapid increase in the overall subgrade temperature. Therefore, not only will it not have a cooling effect , on the contrary, it may cause the temperature of the subgrade to increase, which will lead to the intensification of the freeze-thaw effect inside the subgrade, which may cause secondary subgrade freeze-thaw diseases

[0005] "Enhanced Ventilation and Heat Insulation Subgrade" (Li Guoy

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