Pipeline type hollow control layer for slope cooling of frozen soil roadbed

Abstract

The invention relates to a pipeline type hollow control layer for slope cooling of a frozen soil roadbed. The pipeline type hollow control layer for the slope cooling of the frozen soil roadbed is characterized in that the hollow control layer is of a layer structure formed by multiple hollow tubes fixed side by side, and the hollow tubes are of an integral structure; the hollow control layer is laid along the up and down slope of the roadbed; the highest point of a vent, located on the shoulder side of the road, of the hollow control layer is 90-150 centimeters away from the road surface. Thepipeline type hollow control layer for the slope cooling of the frozen soil roadbed has the advantages of enabling overall roadbed slope cooling efficiency to be multiplied with an one-way ventilation cooling process of a roadbed control mechanism in the past changed to a two-way ventilation cooling process, and allowing the cooling efficiency of air flow from shady slope to sunny slope to be prominent especially in winter. Furthermore, two cost-effective cooling structures are also provided for high fill roadbed, and both cost-effective cooling structures find effective solutions to solvingthe important threat of shady and sunny slope effect to the stability of the roadbed and effectively settling the problem of highway construction in permafrost regions.

Description

technical field [0001] The invention relates to the field of frozen soil engineering, in particular to a pipeline-type hollow control layer used for cooling the slope surface of frozen soil subgrade. Background technique [0002] Frozen soil is a kind of soil and rock with a temperature lower than 0°C and containing ice. The mechanical strength of frozen soil will change greatly with the change of temperature: the lower the temperature, the greater its strength. When the temperature is lower than -1.5°C, Its instantaneous compressive strength is equivalent to that of ordinary rocks; when the temperature is higher than -0.5°C to 0°C, its compressive strength is equivalent to that of ordinary soil blocks, or even basically lost. Therefore, based on the national conditions, scientific workers in cold regions in my country focus on major national projects such as Qinghai-Tibet Railway and Qinghai-Tibet Highway. . [0003] At present, in order to cope with the heating effect of ...

AI Technical Summary

Problems solved by technology

[0004] However, the slope protection measures of hollow blocks have the following disadvantages: (1) At the construction site, they must be manually discharged one by one, first in rows and then in columns, and finally stacked layer by layer, which is cumbersome and inefficient; (2) Due to manual discharge and stacking, it is difficult To ensure the absolute neatness and alignment of the hollow blocks, the mutual dislocation of the middle hollow blocks often occurs, resulting in the narrowing or blockage of the central airflow channel of the hollow block, which affects the ventilation, convection and heat transfer efficiency; (3) The slope protection of the entire hollow block is not accurately considered during construction The position of the air vent at the shoulder end of the measure is randomly placed according to the feeling, which usually makes the air flow inside the hollow block less and the flow process is slow, and usually there is only the air flow process from the toe of the slope up to the shoulder, which leads to convection. The heat effect is not strong; (4) Due to the slow internal air flow rate, as the heat-exchanging air flows through it continuously absorbs heat, the air temperature increases from the toe of the subgrade slope to the top of the roof, that is, there is a temperature difference in the overall control layer Larger phenomena are not conducive to the overall regulation of the subgrade temperature field

[0005] Especially in today's highway roadbed with wider width and black road surface with greater heat absorption, in the face of more intense heat absorption and complex heat transfer process of the roadbed, the cooling efficiency of existing measures is difficult to meet the actual engineering needs. The emergence of slope control measures with more prominent cooling efficiency is urgently needed

Images