Patent ID: 7955026

Claim:
A method for rehabilitating a manhole which rehabilitates the manhole by lining side walls thereof having a side wall of a hollow circular truncated cone form and a side wall of a hollow column form, said method comprising the steps of: preparing a rehabilitating sheet which has a shape corresponding to a shape of the whole inner circumferential surface of said side walls of a manhole to be rehabilitated; providing a frame assembly which supports said rehabilitating sheet so as to have a shape corresponding to the shape of the inner circumferential surface of said side walls of said manhole after inserting said rehabilitating sheet into said manhole; and filling a gap between said inner circumferential surface of said side walls of said manhole and said rehabilitating sheet with a filler to line the inner circumferential surface of said side walls of said manhole by the rehabilitating sheet; wherein ring plates having respective diameters different from each other and corresponding to respective portions of the side wall of the hollow circular truncated cone form are prepared, and the ring plates of a smaller diameter are successively stacked in the vertical direction on the ring plates of a larger diameter, thereby supporting said rehabilitating sheet so as to have a shape corresponding to the shape of the inner circumferential surface of the side wall of the hollow circular truncated cone form.