Patent ID: 7318700

Claim:
A spiral for a turbomachine, the spiral comprising: a plurality of spiral segments arranged around a longitudinal axis of the spiral, the segments being hollow and each segment including an attachable region having a transition; each segment having opposite end faces and adjacent segments being interconnected at their opposing end faces; at least one parallel plate radially inward of the segments, wherein the transitions of the segments are connected to the parallel plate; a reinforcing sheet forming part of a casing of the spiral and arranged proximate to the transition of at least one of the segments, the reinforcing sheet connecting the segment with the parallel plate in a direction of the longitudinal axis of the spiral and providing only a part of a connection to the plate at the transition, wherein the reinforcing sheet is shorter than the transition in a direction along the parallel plate and the reinforcing sheet extends along a part of the connection between the transition and the parallel plate.