Patent ID: 10436374

Abstract:
An apparatus and method is provided for repairing an underground structure such as a pipe or manhole. The apparatus includes a liner assembly made of resin absorbent material. Some embodiments may further include a bladder assembly to help position the liner and press the liner against the walls of the underground structure. A sealing member is positioned in the underground structure. In some embodiments the sealing member is a separate member made from a compressible material, an absorbent material, or a hydrophilic or hydrophobic material. In other embodiments the sealing member is a portion of the liner assembly. The sealing member includes one or more channels adapted to receive a semi-liquid such as a hydrophilic or hydrophobic paste or grout. The semi-liquid is capable of swelling in response to being exposed to another liquid, such as water, and forms a seal between the liner assembly and the host pipe/manhole.