| 摘要 |
Disclosed herein is a sleeve which utilizes fluid pressure to form a seal between two cylindrical objects, typically a manhole wall and its associated conduit. The structure includes a ribbed annular sleeve provided with an inner chamber having valves disposed thereon to permit the introduction of a liquid which when introduced applies pressure on the seal and assures a tight fit. The seal is so constructed to act as a shock absorberand to counter act movement caused by vibration, deflection, or settlement, and a rubber gasket joint between vertical sections of manholes of variable heights, forms a water tight flexible seal, and is also used in joining concrete pipe approximately 18'' through approximately 108'' in all types of pressure conduits or gravity sewer lines.
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