Patent ID: 7707752

Claim:
A method for producing a trench wall in the ground through which an obstacle projects, using a soil-removing trench wall cutter having a frame and at least two cutting wheels mounted on the bottom of the frame for rotary motion about parallel axes of rotation, comprising the steps of: sinking lateral trench wall recesses on either side of the obstacle by sinking the trench wall cutter into the ground past the obstacle in a direction having a vertical component, while rotating the at least two cutting wheels about the parallel axes of rotation; producing a lower trench wall recess below the obstacle by laterally pivoting in the trench wall cutter from at least one of the two lateral trench wall recesses into the ground below the obstacle while rotating the at least two cutting wheels about the parallel axes of rotation, whereby the lower trench wall recess and at least one of the lateral trench wall recesses are produced with the same trench wall cutter.