Pipeline Lining Element with Longitudinal Stiffening Structure
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Solution Overview
Problem
Lining elements for pipeline rehabilitation lack sufficient dimensional stability in the longitudinal direction during inversion, pressing, and curing, leading to potential expansion issues in pipes with varying widths, elbows, and bends.
Innovation Solution
A lining element with a carrier layer of expandable resin-absorbent material and a stiffening structure that has a higher expansion rigidity than the carrier layer, incorporated through needle-punching or interweaving, to limit longitudinal expansion while allowing radial expansion for better pipe adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the carrier layer is made expandable for radial expansion during inversion, then the lining element can adapt to pipe inner walls, but the longitudinal dimensional stability deteriorates causing unwanted expansion in straight sections
Solution Approach 1:
The lining element is segmented into multiple functional layers: an expandable carrier layer for radial adaptation, a stiffening structure for longitudinal stability, and a resin-absorbent layer for bonding. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between radial expandability and longitudinal stability.
Solution Approach 2:
Different regions of the lining element have different mechanical properties. The carrier layer is designed to be expandable in the radial direction while the stiffening structure provides rigidity in the longitudinal direction. This local differentiation of mechanical properties allows simultaneous achievement of radial adaptation and longitudinal stability.
2Manufacturing precision
If the carrier layer expands radially for optimal pipe fitting, then the lining element achieves form-fitting connection, but the thickness varies in regions with width changes, elbows or bends
Solution Approach 1:
The solution addresses thickness variation by introducing a third dimension - the stiffening structure embedded within the carrier layer. This internal reinforcement maintains consistent thickness and structural integrity even when the outer dimensions adapt to pipe geometry changes, thereby maintaining manufacturing precision while allowing shape adaptation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high dimensional stability in the longitudinal direction, preventing expansion issues and ensuring a form-fitting connection to the pipe inner wall, even in areas with changes in width or bends, while allowing radial expansion for optimal fitting.
Implementation Method 1
the layer of resin-absorbent material is impregnated with the resin
Implementation Method 2
A calibration hose, which is usually inflated by means of vapour, is used for inversing, pressing on and/or curing the lining element within the pipeline
Implementation Method 3
a curable resin, in particular, being used as an adhesive... Once the resin has cured, the lining element bears against the inner wall of the pipe
Data Source
AI summary
The invention relates to a lining element (10) for the rehabilitation of a pipeline, having a carrier layer (16) consisting of an expandable, resin-absorbent material which, in the longitudinal direction (L1, L2) of the carrier layer (16), has a first expansion rigidity, and a stiffening structure (24) which, in the longitudinal direction (L1, L2) of the carrier layer (16), has a second expansion rigidity, wherein the first expansion rigidity is lower than the second expansion rigidity and wherein the stiffening structure (24) is incorporated into the carrier layer (16).