| 摘要 |
This invention relates to an apparatus for applying in situ a repair material to a repair zone of an inner wall of a conduit, said apparatus comprising a radially expandable device adapted in use to extend over a predetermined axial length of the conduit to be repaired and over at least a part of the inner circumference of said conduit, said radially expandable device having an outer surface means forming an outer wall of an expandable cavity, means for supplying a pressure medium to said expandable cavity or withdraw said pressure medium from said expandable cavity to either move said outer surface means radially outwardly or to move said outer surface means radially inwardly, and a flexible sheath member separate from said radially expandable device and arranged so as to be capable of forming an outer layer extending along and at least partially circumferentially around said radially expandable device, in use, between said repair material and said outer surface means, and withdrawal means connected to said sheath member adjacent one end whereby said sheath member can be removed from said conduit with at least a portion of the sheath member contacting said repair material everting as the sheath member is moved axially along said conduit and also relates to a method of applying a repair material in situ to a repair zone of an inner wall of a conduit to be repaired. |
