Process for guiding the excavation tool used for the construction of a wall cast in the ground, and excavation tool for implementing this process

A process for guiding an excavating tool used in order to excavate trenches necessary for the construction of a wall cast in the ground, in which:

• a) an excavation tool fitted with a first guiding means is provided,
• b) a second guiding means is provided, said second guiding means being arranges so as to extend substantially over the entire depth of the trench, said first and second guiding means being such that one of said first and second guiding means can slide freely in the other and that they can be mutually engaged and disengaged freely over the entire length of the second guiding means;
• (c) constructing the elementary panel of the wall cast in the ground in a previously excavated trench and then
• (d) after construction of the panel in the previously excavated trench, engaging the first and second guiding means and
• (e) controlling the excavation tool so as to create a force tending to keep the first and second guiding means mutually engaged while the excavation of a following trench is performed.