Method and manufacture of an axial tensioned bolt

Abstract

An axial tensioned bolt and nut for bolting together a turbine or similar piece of equipment. The bolt has parallel threads and the nut has a coil insert. The bolt is stretched and tensioned by a hydraulic tensioner. In one embodiment of the invention, the hydraulic tensioner rests on a bridge element which in turn rests on the surface of the turbine around the nut. The hydraulic tensioner is then attached to the threads of the bolt. The bolt is stretched by the hydraulic tensioner pulling on the bolt while pushing against the bridge. In another embodiment of the invention, a stool with a wide top face rests on the surface of the equipment and the bolt extends through the stool and engages the nut. The bridge element rests on the top face of the stool while the hydraulic tensioner stretches the bolt. In a third embodiment of the invention, a parallel action hydraulic tensioner is attached to both ends of the bolt and pulls the bolt to stretch it.

Dependencies are inferred from the claim text.