Angled-Fiber Tubular Liner for Circumferential Stretch and Fit
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Solution Overview
Problem
Existing tubular liners for pipeline rehabilitation lack sufficient stretchability in the circumferential direction, restricting their ability to properly rest against the old pipe when inflated, due to fibres being oriented either very short and overlapping or continuous, which limits their mechanical parameters and flexibility.
Innovation Solution
A tubular liner with resin-impregnated fibrous layers, including a transverse fibrous layer with fibres angled between 45 to 135 degrees, and multiple layers such as direct roving, chopping roving, and anchor layers, which are sewn or needle-punched to enhance flexibility and stability, allowing for better recognition of side branches and reduced working pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous fibres extending around the complete circumference are used to improve mechanical parameters in the circumferential direction, then the liner has good mechanical strength, but the outermost mat must be connected at the longitudinal edge which restricts stretchability
Solution Approach 1:
The transverse fibrous layer is segmented into multiple sections along the longitudinal direction, with each section containing fibres oriented at angles between 45-135 degrees to the longitudinal axis. This segmentation allows the liner to maintain circumferential strength while creating gaps between sections that enable stretching and adaptation during inflation installation.
2Ease of manufacture
If very short fibre sections laid overlapping are oriented in the circumferential direction, then the liner can be manufactured, but stretchability in the circumferential direction is restricted and a longitudinal seam is required
Solution Approach 1:
Instead of orienting fibres purely in the circumferential direction (0 degrees), the invention introduces fibres at angled orientations (45-135 degrees) relative to the longitudinal axis. This dimensional change in fibre orientation creates a transverse fibrous layer that provides both manufacturability and enhanced stretchability through the angled fibre configuration that can accommodate expansion during inflation.
3Stability of the object's composition
If fibres are oriented to improve mechanical parameters in the longitudinal direction, then stability for pull-in liners is improved, but mechanical parameters in the circumferential direction are compromised
Solution Approach 1:
The liner employs a composite structure with multiple fibrous layers having different fibre orientations. The combination of longitudinal fibres (for longitudinal stability) and transverse fibres at 45-135 degree angles (for circumferential strength and stretchability) creates a composite material system that achieves both longitudinal stability and circumferential mechanical performance simultaneously.
Data Source
AI summary
A tubular liner for the rehabilitation of pipelines or canals, a cured liner, a process for manufacturing a liner, the use of said liner, a process for rehabilitating pipelines or canals and a rehabilitated pipeline or a rehabilitated canal, respectively. The tubular liner includes resin-impregnated fibrous layers, wherein at least one of the resin-impregnated fibrous layers is a transverse fibrous layer which mainly includes fibres arranged at an angle in a range from 45 degrees to 135 degrees with respect to the longitudinal direction of the tubular liner.