Method and manufacture of an axial tensioned bolt

Details Method and manufacture of an axial tensioned bolt Method and manufacture of an axial tensioned bolt

1996-01-11

1998-12-01

Hughes, S. Thomas

Metal working

Method of mechanical manufacture

Assembling or joining

81 5738, 254 29A, B23P 1100, B25B 2902

Patent

active

058422633

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.

REFERENCES:
patent: 3316795 (1967-05-01), Tann
patent: 3566947 (1971-03-01), Jukes
patent: 4438901 (1984-03-01), Reneau et al.
Goodier, J. N., "The Distribution of Load on the Threads of Screws", Journal of Applied Mechanics Mar., 1940, pp. A-10-A-16.
Gosling, M.C., "Improved Turbine Cylinder Bolting System" (unpublished).
Stoeckly, E.E. and Macke, "Effect of Taper on Screw-Thread Load Distribution", Transactions of the ASME Jan., 1952, pp. 103-110.

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