| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent an impervious sheet from rising by the negative pressure of a wind to eliminate a problem such as breakage in an impervious structure wherein a water passing layer is provided between both upper and lower impervious sheets laid double in a waste disposal site by sealing the end parts of the impervious sheets so that outdoor air does not flow in under the impervious sheet. SOLUTION: A waste disposal site 1 has a lower water barrier sheet 3, a water passing layer 4, and an upper impervious sheet 5 put one upon another on a normal surface 2a and a bottom surface 2b of an excavated substrate 2. As raw material for the impervious sheets 3 and 5, high density polyethylene or the like is used. In such water barrier structure of the waste disposal site 1, in the end parts of the upper and lower impervious sheets 3 and 5, that is, in the upper end part of the normal surface 2a, the upper impervious sheet 3 is stuck to the end part of the lower impervious sheet 5 and sealed so that air may not flow into under the upper impervious sheet 3. In this way, air flowing into between the upper and lower impervious sheets 3 and 5 is eliminated to enable preventing the upper impervious sheet 3 from rising even if the wind blows in the waste disposal site 1.</p> |
