在多年冻土区,许多供水管井由于缺乏井下防冻设施而遭受冻害,使管井不能正常生产,甚至报废。这是多年冻土区所经常发生的问题。为了解决这个问题,我院在西林吉试制了防冻装置并取得了成功,现将实验结果作一介绍。一、实验区自然地理简介本区位于大兴安岭北坡丘陵区,地处高纬度带,海拔600～800米,相对高差为200～400米。由于受欧亚次大陆冰川气候的影响,形成大片连续多年冻土区,冻层厚达70～80米,地温年变化深度为14米,年平均地温达-1.2℃。该区气候冬季严寒而漫长,夏季短暂。冰冻期长达7～8个月(10月至翌年 In permafrost regions, many water supply pipe wells suffer frost damage due to the lack of downhole antifreeze facilities, so that pipe wells can not be normally produced or even scrapped. This is a problem that often occurs in permafrost regions. In order to solve this problem, our hospital in Xilinji trial preparation of antifreeze device and has achieved success, the experimental results for an introduction. First, the experimental area Introduction to natural geography This area is located in the northern slope of Daxinganling Hilly, is located in high latitudes, elevation 600 ~ 800 meters, the relative elevation of 200 ~ 400 meters. Due to the influence of the glacier climate in the Eurasian subcontinent, a large continuous permafrost region is formed. The thickness of the frozen layer reaches 70-80 meters. The annual variation depth of ground temperature is 14 meters and the average annual temperature reaches -1.2 ℃. The climate in this area is very cold and long in winter, and short in summer. Frozen up to 7 to 8 months (October to the following year