Longitudinally reinforced cured in place liner and reinforced coating

Abstract

The invention provides a longitudinally reinforced resin impregnated cured in place liner (21). The liner is provided with at least an outer impermeable layer made of a coated reinforcing scrim to limit longitudinal stretch. A continuous length of resin impregnated liner is arranged in lay-flat condition and is impregnated. Then the impregnated liner is supplied to a tubular forming device, and at the same time a tubular resin impermeable coated scrim is also supplied to the tubular forming device, sealed and continuously inverted around an inner tubular member so as to wrapping the tubular member in the inverted way. The resin impermeable coated scrim has greater strength in the warp direction than in the weft direction. The reinforced liner is provided with an integral inner impermeable layer (22) which can be longitudinally reinforced and is arranged in an existing pipeline.

Description

technical field [0001] The present invention relates to a cured-in-place liner for the trenchless repair of existing pipes and pipelines, and more particularly to a cured-in-place liner having an inner impermeable layer reinforced longitudinally by a resin impermeable fabric coating on the outer surface of the liner A cured-in-place lining for the trenchless repair of existing pipelines. Background technique [0002] It is generally known that for existing pipelines and pipelines used to conduct fluids, especially for underground pipelines such as domestic sewage pipes, stormwater drainage pipes, water pipes and air pipes, due to fluid leakage, it is often necessary to repair. This leak may be inward from the surroundings into the interior of the pipeline or the lead-in portion of the pipeline. Alternatively, the leak may be outward from the pilot portion of the pipeline into the surrounding environment. Whether inward or outward, such leaks should be avoided. [0003] L...

AI Technical Summary

Problems solved by technology

Disadvantages include: Difficulties when attempting to impregnate resin-impregnable materials between inner and outer impermeable cladding

[0015] Although these proposals increase longitudinal strength, there are difficulties in handling said mesh and attaching the mesh to the absorbable resin layer, as an over-dense mesh would hinder impregnation and weaken the circumferential pull required for CIPP installations stretch

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