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为了防止“U”型渠冬天的纵向冻裂,一是防渗渠两侧培土的宽度不能太多,一般20至40公分为宜,另一侧也不得超过80公分。二是全部与地平一样高的防渗渠,建好后必须顺渠道的一侧<最好是两侧>挖宽20至30公分,深20至40公分的防冻沟。三是在浇制防渗渠施工中,可以将防渗渠高度的三分之一高出地面,然后培以少量保护土。
In order to prevent the vertical “U” -type channel winter longitudinal cracking, first, impermeable trench on both sides of the soil width can not be too much, generally 20 to 40 cm is appropriate, the other side shall not exceed 80 cm. Second, all the seepage prevention ditches should be as high as the ground level. After they are built, they must go along the side of the canal (preferably on both sides) and dug 20 to 30 cm wide and 20 to 40 cm deep freezing ditch. Third, in pouring impermeable canal construction, one-third of the height of the seepage control canal can be raised above the ground, and then a small amount of protective earth can be cultivated.