Abstract: Method for constructing a screen that restricts or obstructs the flow of subsoil water in the ground by providing in the ground, from the land level downwardly, subsoil water retaining wall elements that engage each other and are in the shape of wide more or less supple films or sheets, that therefore with their lower edge are releasably connected to a flushing lance that in essense is as wide as each film and said lance after insertion of the film in the ground is released and retracted.The invention aims to provide a method with which it is possible to construct in a very simple manner a good seal and coupling of the films adjoining each other.

Abstract: This invention relates to a method for introducing a ground water flow restricting or sealing screen into the soil comprising several side by side mounted whether or not overlapping flexible sheets which each are introduced into the soil with their lower edges by being releasably connected to a lance with substantially the same width and are sealed there to each other and anchored such that a continuous screen is formed, said lance being retracted after the placing of each individual sheet, the sealing of the edges being performed by overlapping and/or hardening material fed in at the location of said edge.