| 摘要 |
A method and apparatus for providing a liner for manholes, drainage systems, sewer system and the like, wherein multiple layers of liner material are sprayed onto the mandrel and outer shell engaging particles are embedded in and partially covered with the liner material. The liner is then placed into a mold and concrete or other suitable material is poured around the liner. The outer shell engaging particles form a mechanical bond between the liner and the concrete, thereby preventing future separation and failure of the liner. |
