Method for providing an underground barrier for a water reservoir

A method for providing an underground barrier for a water flow, which method comprises the steps of:

• drilling in soil a number of parallel vertical holes;
• inserting pipe strings into the drilled holes, wherein each pipe string has a pipe string wall with a plurality of openings arranged distributed along the length of the pipe string;
• introducing an injector in each of the pipe strings;
• positioning the injector at a plurality of discrete depths in the respective pipe string and aligned at each depth with at least one of the openings in the pipe string wall;
• injecting at each discrete depth a sealing compound through the at least one aligned opening into the soil;
• before injecting the sealing compound blocking the pipe string passage above and below the at least one aligned opening;
• and
• pumping the sealing compound in the space between the blockages and the pipe string wall, such that sealing compound is pumped through the at least one aligned opening and is injected into the soil;
• wherein the plurality of openings in the pipe string are provided with unidirectional passages, which prevent inflow into the pipe string.