Liner for manhole and a method for lining a manhole
AssigneesShonan Gosei-Jushi Seisakusho K.K., Yokoshima & Company
InventorsTakao Kamiyama, Yasuhiro Yokoshima
Life of this patent
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Abstract
A flexible tubular manhole liner soaked with a curable liquid resin is inserted into a manhole; this liner is already equipped with a number of bolts or sleeve nuts protruding or exposed from the liner surface, so that it is possible later to attach to the inner wall of the tubular liner a number of ladder steps and a hose for injecting liquid filler to the gap created between the manhole wall and the liner; there is provided a method to line the manhole with such an inventive liner.
Claims15
A tubular liner with which an inner wall of a manhole is lined, comprising a fabric layer soaked with a curable liquid resin, and at least one connector means connected to an inner wall of the tubular liner capable of rigidly receiving connective ends, said connector means consisting of a plurality of first assemblies to which ladder steps are connected.
A method for lining a manhole which communicates with a bottom of a pipe, comprising the steps of:
- (a) inserting into the manhole a tubular liner consisting of a fabric layer soaked with a curable liquid resin and at least one connector means connected to the inner wall of the tubular liner capable of rigidly receiving connective ends;
- (b) inserting an inflatable air bag inside the tubular liner, the bag having an open end;
- (c) closing the open end of the air bag thereby forming a closed space inside the air bag;
- (d) supplying pressurized fluid to said closed space to thereby cause said air bag to inflate and press said manhole liner against the inner wall of the manhole;
- (e) curing said liquid resin to thereby harden said manhole liner;
- (f) removing the air bag from the manhole;
- and (g) rigidly connecting connective ends of a set of ladder steps to said connector means.
Dependencies are inferred from the claim text.