SCREW TENSIONING DEVICE

摘要

The screw tensioning device comprises a support tube (12), a cylinder member (15) and a piston section (17). The piston section serves for moving a tensioning bolt (20) screwed onto the thread of a threaded bolt (31). Provided according to the invention is a depth measuring device (35), which presents an externally visible indication of the screw-in depth (ET) of the threaded bolt (31). This ensures that, when the threaded bolt (31) undergoes extension under strain, there is a threaded engagement with the tensioning bolt (20) along a sufficiently long distance. This avoids the hazard that the screw tensioning device might break off from the threaded bolt.

主权项

1. A screw tensioning device for stretching a threaded bolt carrying a nut, said screw tensioning device comprising a support tube and a cylinder member provided in the axial extension of the support tube, said cylinder member surrounding an axially moveable piston section, and comprising a tensioning bolt extending through the piston section and arranged in engagement with the piston section so as to be axially entrained,
wherein the tensioning bolt comprises an axial channel provided with a depth measurement device for indicating the axial position of the end of the threaded bolt relative to the tensioning bolt.