Abstract: An excavator (1) includes a frame (2) provided with suspension elements (3) for connecting to a mobile carrier, such as a tracked vehicle, as well as cutting members (8) supported on the frame (2) for digging a trench in the ground. The cutting members (8) have at least two endless series (9, 10) of cutting elements; at the same time, the cutting elements (9, 10) define a front side (11) to be turned towards a digging front and a return side (12) turned away from the digging front. Lateral guides (14) are provided on either side of the cutting members (8) for supporting the side walls of the trench.

Abstract: A method for driving a number of sheet pile planks which have jaw slots into the ground, having the steps of: providing a previous sheet pile plank provided with at least one discontinuity, driving this previous sheet pile plank into the ground, causing the jaw slots of a previous sheet pile plank driven into the ground and a next sheet pile plank to interlock, driving the next sheet pile plank into the ground while maintaining the interlocking of said jaw slots, causing the next sheet pile plank to interact with the discontinuity of the previous sheet pile plank, and stopping the process of driving the next sheet pile plank into the ground after this mechanical event has been detected at the top end of this sheet pile plank.