Wind turbine installation comprising an apparatus for...

Metal deforming – By use of tool acting during relative rotation between tool... – Work-hammering tool

Reexamination Certificate

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Details

C072S046000, C072S123000, C470S002000, C470S009000, C470S011000, C470S049000, C029S517000

Reexamination Certificate

active

07975519

ABSTRACT:
A wind turbine installation comprises anchor bolts having a sheath or sleeve which extends above the cement foundation and the overlying grout layer. If desired, the sleeve may partially extend inside the base flange of the wind turbine tower. The sleeve may be manufactured from polypropylene, polyethylene or other materials having satisfactory mechanical properties, primarily that the material be capable of withstanding sufficient plastic deformation to cause the material to conform to the shape of the threads of the anchor bolts without the material failing. This swaging operation results in a crimped end which forms an interference fit with the threads of the anchor bolt thereby preventing or limiting the intrusion of water or other liquids into the bolt-sleeve annulus during the installation of the turbine foundation.

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patent: 4167229 (1979-09-01), Keusch et al.
patent: 4649727 (1987-03-01), Gray
patent: 5040396 (1991-08-01), Mikhail et al.
patent: 5076746 (1991-12-01), Fischer et al.
patent: 7465234 (2008-12-01), Keener et al.

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