METHOD AND INSTALLATION FOR MECHANICAL EXCAVATION OF A CROSS PASSAGE BETWEEN TWO TRAFFIC TUNNELS OR BETWEEN TWO VERTICAL WELLS

摘要

The present invention relates, in particular, to a method for mechanical excavation of a cross passage (6) between two traffic tunnels (1, 2) or between two vertical wells, characterized by the fact that it comprises a series of steps as follows: i/ a first section (6a) of metal tube equipped with a cutting lip, the internal diameter of said tube being equal to the internal diameter of said cross passage (6), is driven forward from a first (1; 2) of said two tunnels (1, 2) or wells, in the direction of said second tunnel (2; 1) or well; ii/ a second section (6b), having the same diameter, is placed behind said first section (6a) of tube and in extension thereof, and said two sections (6a, 6b) are driven forward together; iii/ operation ii/ is repeated as required; said tube sections (6a, 6b, 6c) being left in place and the materials contained in the tube being evacuated later.