In a method for documented tightening or retightening of a screw connection that includes a threaded bolt and a nut screwed onto the bolt and is supported on a flange surface, an exchangeable socket of a tensioning cylinder supported against the flange surface is screwed onto the free threaded end of the threaded bolt. The exchangeable socket is hydraulically tightened with longitudinal expansion of the threaded bolt while the nut is co-rotated by rotation of a rotary sleeve connected to the nut for conjoint rotation. Switching elements, in a first operating mode, allow only the exchangeable socket to be electrically driven and, in a second operating mode, allow only the rotary sleeve to be electrically driven. A process control unit provided with a documentation module is used to control the method.
展开▼
