Method for laying a drainage pipe to the dewatering of the ground and apparatus and drainage pipe for carrying out the method

摘要

P drainage. / p & & p & the drain coated 4 is carried out continuously, on the burying machine 1, from a perforated tube 10 and a filtering material 12. Preferably, the coating filtering is held in place by a hooking strip 21 whose two faces of the hooking elements adapted to penetrate into the structure of the edges of the sheath overlapping. / p & & p & application to the cleaning of floors. / p