Patent ID: 11965617
Assignee: SANEXEN ENVIRONMENTAL SERVICES INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 19:
20. The method of claim 15, wherein the external later comprises a steel cylinder coated with an exterior concrete coating and lined with an internal cement mortar lining, and said drilling the first cavity comprises drilling through the exterior concrete coating, welding a coupling on an outer surface of the exterior concrete coating, drilling through the exterior concrete coating, the internal cement mortar lining and the interior layer until exposing an outer surface of the interior sealing layer; said injecting the sealant into the first cavity comprises casting the sealant into the first cavity to wet and impregnate walls of the first cavity, an interface between the coupling and the exterior concrete coating and an interface between the steel cylinder and the internal cement mortar lining; the first cavity having a first diameter and the second cavity having a second diameter smaller than the first diameter.