Method of digging tunnels with non-circular section profile and driving shield for its performing

摘要

The method and the driving shield for driving of non-circular cross-section consist of front cutting heads of the shield (2a till 2j) fixated to the bearing body that carry out the hole with the shape of conjuction of circles by rotating and moving in the direction of the tunnelling of the driving shield and just after that the final shape of tunnel cross-section is carried out by removal of rest of the face and by creating concave or concave and planar surfaces which are perpendicular to surfaces of the hole made by rotating of the finishing cutting heads (8a till 8k) of the driving shield. The axis of rotating of each finishing cutting head (8a till 8k) is non-intersectoral to axes of rotating of the front cutting heads (2a till 2j).