To line an inner circumferential surface of side walls of a manhole, a rehabilitating sheet made of a sheet material resistant to water and corrosion is provided in the form of a bag having a shape corresponding to the inner circumferential surface to be lined. The rehabilitating sheet is inserted into...http://www.google.fr/patents/US7955026?utm_source=gb-gplus-shareBrevet US7955026 - Method for rehabilitating a manhole
