Abstract: A method for constructing an underground wall in a soil formation includes arranging a plurality of drilling pipes in a predetermined pattern adjacent to one another. Each of the drilling pipes has an open distal end, a plurality of teeth radially extending therefrom and at least one channel shaped profile extending along the length thereof. The drilling pipes are rotatably driven into the soil while a hardening liquid is injected into soil loosened by the plurality of teeth. The hardening liquid is agitated and mixed with the loosened soil as each of the drilling pipes is driven into the soil. The mixture of the loosened soil and the hardening liquid is solidified in situ in each of the drilling pipes.