Tensioning device for simultaneously tensioning a plurality of bolts

A device for simultaneously and equally tensioning a plurality of bolts connecting a first body to a second body with one end face of the first body abutting against the corresponding face of the second body, in which the bolts are axially immovably secured in the region of one of the ends thereof to said second body and project from the latter with clearance through bores in said first body and beyond the latter, said device comprising a single carrier member on the side of the first body facing away from the second body, said carrier member being formed with a plurality of bores therethrough respectively aligned with the bores in the first body and said bolts extending with clearance through said bores of said carrier member and projecting with end portions thereof beyond the latter, each of said bolts having an intermediate threaded portion projecting beyond a face of said first body opposite said one end face;

• means on said end portion of each bolt for preventing movement of said carrier member away from the first body;
• fluid operated cylinder and piston means between said carrier member and said opposite face of said first body for pressing said carrier member away from said first body in tight engagement with said first mentioned means to thereby simultaneously transmit equal tension forces to all of said bolts;
• and a nut screwed onto said intermediate portion of each bolt to be turned into engagement with said opposite face of the first body after all of said bolts have thus been simultaneously tensioned with said equal tension forces so as to hold the first body in tight engagement with said second body by said tension bolts.