| 摘要 |
Method and apparatus for forming a void through the wall of a pipe during the casting process and supporting a gasket for embedment in the pipe about the void. The apparatus is made in three pieces, including an outer, contoured mold member which engages the pipe form and supports the gasket by engaging one of the faces, a ring shaped sustaining plate which engages an inner edge of the gasket in an interference fit, and an inner mold member which is also contoured, and in conjunction with the outer mold member, defines the void through the wall of the pipe. The inner and outer mold members, which are relatively expensive, can be stripped from the freshly cast concrete pipe at the same time the pipe form is removed and reused in another casting operation, while the relatively inexpensive sustaining ring is retained in the freshly cast pipe to support the gasket and maintain it round until the concrete has cured to sufficient strength to allow the sustaining ring to be removed.
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