Method for boring slide back anchor and shield machine

摘要

Problem to be solved: to provide a means that does not require a new Jack to move and position the slide back anchor.Solution: a sliding back anchor comprising at least a back anchor a including a plurality of anchor girders 10 connected to a shield Jack y and a position adjusting portion B (screw rod 30, a bearing column 40, and a regulator 50) provided between anchor anchor 10 and fixed point C . At the time of expanding operation of the shield Jack y, the excavation thrust or earth pressure received by the anchor girder 10 is transmitted to the fixed point C in the order of the regulating tool 50, the screw rod 30, and the support column 40.In the moved anchor column 10, the left-hand limiting tool 50 is returned to its original position, and the other is the reaction force receiving member of the anchor column 10 when it is moved.Diagram