| 摘要 |
In this method, essentially vertically extending plastic sheets (2) stretched by means of at least two holding devices (5, 7) each onto flexurally rigid, frame-like supporting elements (9) and having only slight inherent rigidity are lowered together with the supporting element (9) by means of a lifting apparatus (8) into an earth trench (1) filled with suspension while simultaneously threading the lock parts (10, 11), allocated to one another, of plastic sheets (2/m, 2/m + 1) bearing against one another. <IMAGE>
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