Cured-In-Place Pipe Liner Structure for Wrinkle-Free Pressure Repair
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pipe lining methods fail to provide reliable, pressure-bearing capacity to damaged pipes, especially those subjected to high-pressure fluids, without creating wrinkles during installation.
Innovation Solution
A cured-in-place pipe liner comprising an outer impermeable portion, inner and outer strength portions with strengthening fibers, and a middle felt portion, where the strength portions are formed into concentric tubes with overlapping seams to allow circumferential stretching during installation, ensuring a smooth, watertight surface without wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pipe lining methods are used, then the pipe interior is lined with a barrier, but wrinkles are created during installation that compromise structural integrity
Solution Approach 1:
The liner is divided into multiple longitudinal segments that can independently expand during installation. Each segment contains strengthening fibers that prevent wrinkle formation while allowing the overall liner to conform to the pipe interior, thus maintaining surface smoothness and structural integrity simultaneously
Solution Approach 2:
The liner combines multiple materials with complementary properties: a flexible impermeable barrier material for fluid containment, and embedded strengthening fibers (such as glass or polymer fibers) for structural support. This composite structure prevents wrinkle formation while maintaining the ability to conform to the pipe interior without compromising structural integrity
2Strength
If the liner is made from single-layer material, then the structure is simple, but it cannot provide sufficient pressure-bearing capacity under high-pressure fluids
Solution Approach 1:
The liner employs a composite structure combining an impermeable barrier material with embedded strengthening fibers. The barrier material provides fluid containment while the strengthening fibers (glass, polymer, or other high-strength materials) provide the additional pressure-bearing capacity needed to withstand high-pressure fluids, achieving high strength without excessive structural complexity
Solution Approach 2:
The strengthening fibers are strategically distributed within the liner structure, with higher fiber density or concentration in regions experiencing higher stress under internal pressure. This localized reinforcement provides maximum pressure-bearing capacity where needed while maintaining overall structural efficiency
3Reliability
If the liner material is made completely rigid to prevent wrinkles, then structural integrity is improved, but the liner cannot conform to the pipe interior during installation
Solution Approach 1:
The liner exhibits different mechanical properties at different scales: locally flexible to conform to the pipe interior during installation, but globally rigid enough to prevent wrinkle formation. This is achieved through the composite structure where the flexible barrier material allows conformability while the distributed strengthening fibers provide wrinkle prevention
Solution Approach 2:
The liner uses a flexible impermeable barrier material that can conform to the pipe interior shape during installation. The flexibility of this thin-film barrier is complemented by embedded strengthening fibers that prevent excessive deformation and wrinkle formation, achieving both conformability and wrinkle prevention
Data Source
AI summary
An eversion liner for lining a pipe includes an impermeable outer portion, inner and outer strength portions inside the impermeable outer portion, and a middle portion including at least one felt layer radially between the inner and outer strength portions. At least one of the inner and outer strength portions is formed from a unitary sheet of strength material that includes parallel chopped strands of fiber. The longitudinal edge margins of the sheet of strength material are positioned in overlapping engagement and joined together by joining structure. The parallel chopped fibers can be oriented transverse to the length of the liner. The joining structure can prevent reduction in a width of the overlapped edge margins as the liner expands during eversion.