for the soil as can be seen in fig2 a and 2e the edges 64 65 of the legs 61 62 are downwardly and rearwardly inclined the level of the edges 65 a b is just below the level of the lower edges of blade legs 101 102 the wall 66 and therewith the legs 61 62 however extend laterally beyond the blade legs 101 102 and the blades 86 a 86 b moreover the level of the edges 65 a 65 b is slightly higher than the level of the upper edges 87 a 87 b of the blades 86 a 86 b in fig5 a picture at a given moment is given of a project in which the apparatus according to the invention is being used the excavating machine 40 holds the kings post 2 straight up and provides the necessary power and operation lines the project was started on the left hand side in the drawing the hydraulic machine 40 has moved itself over the ground level 41 underneath which a sand layer 42 is situated at larger depth a sand layer 44 is situated between relatively weak for instance clay or loamy earth strata 43 and 45 in order to be able to carry out a project such as the construction of a rail road or motorway at the ground level it is necessary to reinforce the earth stratum 43 which takes place by accelerated consolidation by.