Expansion fixing with axially crushable arrangement.

摘要

To provide an axially crushable feature for an expansion fixing the segments (6) of a segmental metal sleeve (5) are each provided with a portion which, while remaining of generally uniform thickness with the remainder of the segment, has a configuration such that it can readily be deformed to permit shortening of the segment when the segment metal sleeve is subjected to an axial compression force. Particularly the portion may be provided as curved cantilever arms (11) which in an initial configuration have their free ends spaced apart but can deform into abutment, providing a positive limit on crushing.