Tensioning device for simultaneously tensioning a plurality of bolts

摘要

A fluid-operated device for simultaneously pretensioning a plurality of bolts connecting a first body to a second body in which the bolts are screwed with threaded end portions thereof into corresponding threaded bores in the second body and project with clearance through bores in the first body and with opposite threaded end portions thereof beyond the first body. The device comprises a carrier member arranged on the side of the first body opposite the second body and provided with a plurality of bores through which the bolts extend with clearance, a first nut screwed on the projecting other end portion of each bolt, at least one fluid-operated piston arranged on said carrier member movable along an axis parallel to those of the bolts and engaging with an end thereof the first body so as to simultaneously tension, when operated all of the screw bolts, and a second nut on an intermediate threaded portion of each bolt turnable into engagement with the first body after the bolts have been tensioned so as to hold the bodies in tight engagement with each other by the tensioned bolts.