Pipeline Lining Material With Overlapping Fiber Jacket
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Solution Overview
Problem
Existing tubular lining materials for pipelines lack structural-resistance, flexibility, and high pressure resistance, particularly when subjected to external loads and earthquakes, and require high pressure for expansion, which complicates the relining process.
Innovation Solution
A tubular lining material with a reinforcing inner jacket comprising at least two sheets of high strength and high modulus fibers that overlap in the lengthwise direction, allowing for low-pressure expansion and maintaining structural integrity even after curing, and featuring a flexible outer layer for improved flexibility and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional tubular lining materials are used, then the pipeline can be reinforced, but the lining material lacks structural-resistance and cannot withstand high external loads and earthquakes
Solution Approach 1:
The lining material uses a composite structure combining a flexible porous substrate (felt, mat, or woven fabric) with an air-impervious outer layer and internal reinforcement elements. This composite construction provides both flexibility for installation and structural-resistance for withstanding external loads and earthquakes, resolving the contradiction between strength and reliability.
2Ease of manufacture
If high pressure is applied for expansion during relining, then the lining material can be installed, but the process becomes complex and difficult
Solution Approach 1:
The lining material employs a flexible porous substrate with an air-impervious outer layer that can be easily expanded and conform to the pipeline interior. This flexibility reduces the expansion pressure required during installation and simplifies the relining process, addressing the contradiction between ease of manufacture and energy consumption.
3Strength
If the lining material is made rigid for pressure resistance, then it can withstand high pressure, but it loses flexibility and becomes difficult to install
Solution Approach 1:
The lining material features different layers with different properties: a flexible porous substrate for ease of installation and conformability, an air-impervious outer layer for pressure resistance, and internal reinforcement elements for structural strength. This local differentiation of material properties allows the lining to be both flexible during installation and rigid for pressure resistance, resolving the contradiction between strength and ease of operation.
Data Source
AI summary
A tubular lining material for reinforcing pipelines, utilizable in a pipe-lining method wherein the tubular lining material, having a binder disposed on the inner surface thereof, is inserted into a pipeline and is allowed to advance within the pipeline as the tubular lining material is turned inside out under fluid pressure whereby the tubular lining material is applied to the inner surface of the pipeline with the binder being interposed between the pipeline and the tubular lining material, said tubular lining material including an outer layer of an impervious material and provided on the inside thereof with an inner reinforcing tubular jacket wherein the inner reinforcing tubular jacket includes at least two sheets of high tensile strength and/or high modulus fibers and wherein the sheets overlap at least two locations and wherein said overlap portions extend in the lengthwise direction of the inner tubular jacket.