美因茨对阵弗赖堡的比分结果
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青藏公路熱棒制冷工程(Heat Pipe Subgrade in Permafrost Regions)
來源:西安中交公路巖土工程有限責任公司   發布時間:2013/7/1   瀏覽次數:


  青藏公路穿越數百公里的多年凍土地區。周而復始的凍融循環所導致基底的不均勻變形及其帶來的路面、橋涵等構造物的破壞,多年來一直是青藏公路建設和管養過程中最大的技術難題。

  公司技術人員在進行路基科研試驗和施工中,除采用通風路基、碎石邊坡、遮陽板等先進技術手段外,還在高溫、高含冰量路段采用了無動力熱棒制冷技術,即利用封閉管體中液態與氣態轉換散熱原理將凍土地層中的熱量傳輸至大氣中,降低多年凍土溫度,防止多年凍土上限下移,有效改善了多年凍土路段地基土體的力學特征。青藏公路楚瑪爾河高平原K2937+100~K2939+160、K2947+500~K2951+100兩段路基沉降變形和縱向裂縫十分嚴重,采用熱棒制冷技術處治后已使用三年,效果良好。大規模采用熱棒制冷技術解決多年凍土地區路基穩定問題,在我國尚屬首例,并為青藏公路建設所采用。

  Qinghai-tibet highway runs through the permafrost area of several hundred kilometers. The ununiformity deformation of subgrade bottom caused by repeated frost-and-thaw cycle and the breakage to the structures such as road surface, bridge and culvert have been  all along the most difficult technology problem for many years.
In scientific research test and construction, in addition to using advanced technology means such as ventilation subgrade, macadam side slope, sunshading board, the professionals of the company adopt
the no-power hot stick cooling technology in the road section with high temperature and high ice content, namely: transforming the heat in frost soil layer to the atmosphere in light of the cooling theory of liquid-and-gas conversion in closed pipe so as to decrease permafrost temperature and to prevent the upper limit of permafrost from moving downward, this technology effectively improves the mechanics feature of subgrade soil in permafrost road section. The subgrade of K2937+100~K2939+160 and K2947+500~K2951+100 sections of Chuermahe high plain in Qing Zang highway had serious settlement deformation and longitudinal crack, after treatment by hot stick cooling technology three years ago, it is still in good condition. This is the first example of using hot stick cooling technology on a large scale to solve the subgrade stability problem in permafrost area, and it was adopted in construction of Qing Zang highway.

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