| 摘要 |
A collar assembly comprises a collar which is formed from a plurality of collar portions. The collar features a duct 14 receiving portion, a first seal positionable on an outer surface of the collar and a second seal positionable on an inner surface of the collar. The collar portions are sealingly connected together to form the collar. This collar is installed by creating an aperture in a structure containing the duct 14, then placing each collar portion around the duct and inserting the collar into the structure. The collar is then attached to the structure. The collar can extend entirely around the duct 14, and can feature hydrophilic seals. The aperture defined by the collar can be substantially circular, and the outer profile of the collar can be square or rectangular, or circular but with a substantially straight side. Flanges at the end of each collar portion can be used to connect them together. The collar assembly can further comprise a former 52 made from a plurality of former portions. This former 52 can comprise a lifting eye and water bar. |
