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Stilt layer for reducing frozen earth roadbed temperature field

An overhead layer and temperature field technology, applied in infrastructure engineering, construction, etc., can solve the problems of driving safety hazards, visual pollution, high thermal conductivity, etc., achieve outstanding cooling performance, maintain long-term stability, and reduce engineering costs.

Inactive Publication Date: 2008-01-02
COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But the outstanding problems are: first, because the thermal conductivity of the embankment filled between the ventilation pipes is relatively high, in the four seasons of the year, a large part of the heat absorbed by the embankment surface is still transmitted through this part of the soil. into the lower subgrade, which will greatly reduce the cooling effect of the ventilated subgrade; secondly, the cooling effect of the ventilated subgrade is mainly reflected in the ventilation volume of the ventilation pipe. In order to increase the ventilation volume, it is necessary to either increase the diameter of the ventilation pipe or to Encrypted ventilation pipes, both of which greatly increase the difficulty and cost of engineering construction; third, the difficulty of engineering construction is relatively large
However, due to the blocking effect of the sun visor on the slope, it is difficult to carry out maintenance on the roadbed and restoration of vegetation in the future, and at the same time, due to the strong reflection effect, it causes visual pollution and hidden dangers to driving safety
Make it difficult for sun visors to be applied in engineering practice

Method used

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  • Stilt layer for reducing frozen earth roadbed temperature field
  • Stilt layer for reducing frozen earth roadbed temperature field
  • Stilt layer for reducing frozen earth roadbed temperature field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Field on-site processing or indoor factory prefabrication produces reinforced concrete cubes, cuboids and slabs.

[0034] As shown in Figure 1, an overhead layer to reduce the temperature field of the frozen soil embankment is built when the embankment is filled to a density of 0.5m. Firstly, a 0.2m cement stable layer is laid and compacted at the bottom of the roadbed. After the cement stable layer is cured and formed, concrete (or reinforced concrete or reinforced fiber concrete) is built on the stable layer in a certain way along with the direction of the roadbed in an orderly manner. ) Each unit of the combination of rectangular block 1 and cover plate 2. There are intervals between the block and the block in the overhead layer to form a ventilation channel with a thickness of 0.30m, which is placed horizontally at a certain position in the subgrade (see Figure 2). It is built in an orderly manner along the direction of the embankment. There are intervals around th...

Embodiment 2

[0037] As shown in Figure 1, an overhead layer for reducing the temperature field of frozen soil embankment is according to embodiment 1, laying a layer of lime stable layer at the bottom, and a multi-layered overhead layer built with cubes on the stable layer, with a layer thickness of 1.0m. Between the upper and lower blocks, the center of the upper block corresponds to the gap of the lower block, arranged in a staggered manner, and placed in a certain position in the subgrade. Fill soil on cover plate 2 then, complete the building process of whole subgrade with this.

experiment example

[0038] Experimental example: test comparison of ordinary roadbed, ventilated roadbed and elevated layer roadbed

[0039] In order to verify the effectiveness of this technology, we used the measured data of the Qinghai-Tibet Highway and the Beiluhe Railway Test Site of the State Key Laboratory of Frozen Soil Engineering, Chinese Academy of Sciences to construct a calculation model. Marc large-scale simulation calculation software has carried out the simulation simulation analysis. In order to verify the authenticity and effectiveness of the calculation model, the simulation calculation analysis of the common subgrade was carried out first, and compared with the measured data. The actual measurement results are taken from the temperature measurement data of the center hole of the ordinary roadbed at the Beiluhe Qinghai-Tibet Highway Test Site. It can be seen from the actual measurement and calculation results on September 15, the third year after the ordinary roadbed was forme...

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PUM

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Abstract

The invention discloses a new type structure overhead layer, which is characterized by the following: adapting each unit of concrete (or reinforced concrete) rectangular block and cover board to build subgrade along the subgrade strike sequently based on dense and stable layer; setting the cover board on the subgrade; connecting the extended road embankment slope with the external environment. The invention is important to maintain the annual frozen soil, which keeps engineering building stable.

Description

technical field [0001] The invention relates to a novel structural form for reducing and regulating the temperature of the permafrost subgrade. Background technique [0002] Permafrost is a kind of soil and rock with a temperature lower than 0°C and containing ice. According to the length of frozen soil preservation time, it is mainly divided into seasonal frozen soil (half a month to several months) and permafrost (more than one year). The distribution area is called For the cold area. More than 50% of the world's land area is covered by cold regions. In my country, the areas of cold regions and permafrost account for 75% and 21.5% of the national land area respectively. my country is the third largest country in the world with permafrost, and the area of ​​high-altitude permafrost ranks the largest in the world. [0003] Not only due to the existence of ice, its properties will undergo complex and fundamental changes compared with thawed soil, but also in the permafrost ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/35
Inventor 俞祁浩程国栋潘喜才何乃武
Owner COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE