FIELD: construction of horizontal drainage systems. SUBSTANCE: ditch excavation and laying of drainage tube with filter are carried alternately in cycles by grab bucket scoops. Ditch extracted by cycles has length equal to width of opening of grab bucket scoops. Drawdown is effected and part of water is returned to ditch at the moment of its excavation. When pipe layer is moving, ditch is backfilled with ground. EFFECT: higher efficiency. 2 cl, 2 dwg
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