Apparatus and method for repairing underground conduits in situ

Details Apparatus and method for repairing underground conduits in situ Apparatus and method for repairing underground conduits in situ

1994-09-28

1996-10-01

Stemmer, Daniel J.

Pipes and tubular conduits

Repairing

Patches

138141, 428 362, 428 368, 428 3691, 156294, B32B 108, F16L 55162

Patent

active

055603955

ABSTRACT:
An insert system for repairing defects in underground conduits in situ comprises a tubular inner liner of stiff material having a generally smooth inner surface and a plurality of integral outer circumscribing ribs defining a plurality of valleys between the ribs. An outer sleeve circumscribes the inner liner and is formed of an elastomeric material. A mid-layer of reinforcing woven material is wrapped about the inner liner within the outer sleeve. A hardenable resin saturates the mid-layer and fills the valleys. The resin bonds to the inner liner to form a structural insert, and the outer sleeve provides a deformable seal against an inner surface of a conduit when the insert system is operatively positioned.

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