Fuente: WIPO "rice" A method of grouting the annular space (11) which is defined between an inner wall surface of an existing sewer run (10) which is being renovated, and an outer wall surface of an externally ribbed pipe liner, (17) which is inserted into the sewer run. The method comprises rotating the ribbed pipe liner (17), and feeding grout material continuously onto the outer surface of the pipe liner (17) so as to be conveyed by the external ribbing of the pipe liner (17) along the annular space (11) and to fill the latter as the pipe liner (17) is rotated.