Abstract: A method for forming a drilled pile wall in ground using a drilling device having a reamer and flushing with a medium to remove drilling waste during drilling, and non-rotating pipe piles equipped with interlocks. A vertical 1 hole is drilled while simultaneously placing a pipe pile in the drill hole. At least one subsequent vertical hole is drilled hole in the ground side by side with the drill hole while simultaneously placing a subsequent pipe pile in the subsequent drill hole while the interlocks of the subsequent pipe pile interlock with interlocks of the pipe pile to guide the subsequent pipe pile into the drill hole. Reinforcements are installed in the drill holes, concrete is cast into each pipe pile to form a concrete pile, and at least some of the pipe piles are lifted at least partly out of the drill hole after the concrete has been cast, but before the concrete has bonded rigid to form a unified watertight pile wall. The invention also relates to a pile wall.

Abstract: The present invention relates to a drilling apparatus provided for drilling away an existing underground pipe and for replacing it with a new pipe. The apparatus comprises a tubular body; a percussive drill bit slidably connected to an end of the tubular body where the drill bit is capable of reciprocating movement with respect to the tubular body; a device for moving the percussive drill bit with respect to the tubular body to perform drilling operations at a drilling location; a guiding element fixedly connected to the tubular body and axially passing through the tubular body and the drill bit to connect, in a direction of travel of the drilling apparatus, to a device causing the advancing movement of the tubular body. The guiding element and the percussive drill bit are axially movable relative to each other to prevent impacting movements from the drill bit from being transmitted to the guiding element.