Tensioning Device for a Screw Connection, Method for Tightening a Screw Connection, and Threaded Nut

摘要

A tensioning device for elongating a screw assembly, provided with threaded bolt and threaded nut supported on a fixed substructure, by applying a traction force to a free threaded end of the threaded bolt has a cylinder housing with internal wall and a piston movable in the cylinder housing in longitudinal piston direction. The piston together with the internal wall delimits a hydraulic operating space. A replaceable bush entrained by the piston in the longitudinal piston direction has a thread with which the bush can be screwed to the threaded bolt. A support tube is disposed on the cylinder housing, is supported on the fixed substructure, and surrounds the threaded nut. A lock bar is disposed on the support tube and has a lock-bar face facing the piston. The lock-bar face bears on a blocking face of the threaded nut that faces away from the piston.

主权项

1. A tensioning device for elongating a screw assembly, comprised of a threaded bolt and of a threaded nut supported on a fixed substructure, by applying a traction force to a free threaded end portion of the threaded bolt, the tensioning device comprising:
a cylinder housing comprising an internal wall; at least one piston movable in the cylinder housing in a longitudinal piston direction, the at least one piston together with the internal wall of the cylinder housing delimiting a hydraulic operating space; a replaceable bush configured to be entrained by the at least one piston in the longitudinal piston direction, wherein the bush comprises a thread for screwing the bush onto the threaded bolt; a support tube coaxially disposed on the cylinder housing and surrounding the threaded nut, the support tube configured to be supported on the fixed substructure; a lock bar disposed on the support tube, wherein the lock bar comprises at least one lock-bar face facing the at least one piston, wherein the lock bar is configured to bear with the lock-bar face on a blocking face of the threaded nut, the blocking face of the threaded nut facing away from the at least one piston.