| 摘要 |
An internal lining for ducts (C) is provided by introducing into one end of the duct an assembly (E) which comprises a sleeve (5) and an inflatable system (2) and which is provided with heating means for applying a sheath (1) impregnated with a resin against the inner wall of said duct (C). After partial polymerization at least of the resin, the sheath (1) adheres to the inner wall of the duct. The system (2) is then deflated, the heating stopped and the assembly (E) withdrawn from the duct. With the length of the duct a multiple of the length (l) of an assembly (E), the operation is repeated by introducing into the duct successively a multiplicity of sheaths (1) until the inner wall of the duct (C) is provided with an internal lining over the whole of its length.
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