Device and a method for rehabilitating conduits
AssigneeNovaliner Technologies Inc.
InventorPierre Pare
Life of this patent
Estimating the term…
Abstract
A polyurethane applicator (10) for spraying at high-pressures a liner on the inner circumferential wall of an existing conduit (C) to be rehabilitated. The applicator (10) includes a carriage (12) coaxially guided in the conduit (C) and an atomizer (16) rotatably mounted to the carriage (12) for rotation about the central axis thereof. The atomizer (16) is provided with a nozzle (62) through which the lining mixture is forced out while the atomizer (16) rotates and travels in conduit with the carriage (12).
Claims27
A device for lining a conduit to be rehabilitated, comprising a movable carriage having an axis, said carriage being adapted to enter and be displaced coaxially through the conduit, and a spray source rotatably mounted to said carriage for rotation about said axis, said spray source including a nozzle through which a fast setting lining mixture is forced out under pressure while said spray source is rotated about said axis and said carriage is axially displaced along the conduit, thereby providing for a uniform distribution of the lining mixture on an inner wall of the conduit, and wherein at least first and second fluid passages are provided for separately feeding first and second components of the fast setting lining mixture to the spray source where the first and second components are mixed together as the lining mixture is being applied.
A method for in-situ lining of a conduit to be rehabilitated comprising the steps of:
- inserting a spray source into a conduit to be rehabilitated, and forming a continuous liner on an inner wall of said conduit by spraying in a helical pattern at least a first layer of lining material on the inner wall while the spray source is coaxially displaced in the conduit and rotated about a central axis thereof, wherein said lining material is a fast setting lining material having at least first and second components, and wherein said first and second components are separately fed to said spray source where said first and second components are mixed together as the fast setting lining material is being applied.
An atomizer for spraying a fast setting lining material on a surface, the atomizer comprising an elongated body, a head mounted at one end of said elongated body and defining a mixing chamber for separately receiving the components of the fast setting lining material from separate fluid passages, said head carrying a nozzle through which the fast setting lining material is forced out of the mixing chamber, and a linear actuator extending along said elongated body for displacing said head in a direction perpendicular to said elongated body between a closed position, wherein the components of the fast setting lining material are prevented from reaching said mixing chamber, and an open position wherein the components of the fast setting material are free to flow into said mixing chamber.
Dependencies are inferred from the claim text.