Method and apparatus for removing mud from below an underwater construction

摘要

The invention relates to a method and apparatus for removing mud from below an under water construction by means of a tube inserted into the mud layer and moved through the mud layer from which tube (4) air is directed through a row of openings (5) in a downward and forward direction. Said tube (5) may at its outer ends have guiding flanges (16,17) connected with drawing means (19,20,21,22,23,24) for adjusting the angular position of the air jets (5). The tube (28) may be moved in an angular position with respect to the direction of movement (6) or may be V-shaped having its point directing in the direction of movement. A second tube (10) may be moved in synchronism with the first tube (4) said second tube having upwardly extending outlet openings (11) for air for creating an air screen, which generates a water flow for directing the direction of flow of the air bubbles with particles generated by the first tube (4).