Multi-layered Conduit Repair Liner with Hook and Loop Attachment
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Solution Overview
Problem
Existing methods for repairing cracks or leaks in underground conduits using silica resin are ineffective due to its poor adhesion to liners, which limits the thickness and strength of the repair, and require quick application and inflation before the resin sets, making it difficult to execute effectively.
Innovation Solution
A conduit repair liner system comprising two sheets of planar material coated with silica resin and equipped with hook and loop straps for temporary attachment to a carrier, allowing for extended working time and improved adhesion to the conduit surface, enabling a thicker and stronger repair without the need for external excavation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silica resin is used for repairing conduit cracks or leaks, then the repair strength and structural integrity are improved, but the adhesion to the liner deteriorates
Solution Approach 1:
The liner is divided into multiple layers: a first layer in direct contact with the conduit surface that provides adhesion, and a second layer that provides structural strength. This segmentation allows each layer to be optimized for its specific function, resolving the contradiction between adhesion and strength.
Solution Approach 2:
The first liner layer acts as an intermediary between the conduit surface and the second liner layer. It provides the adhesion that silica resin lacks, while the second layer provides the structural strength, thus mediating between the requirements for adhesion and strength.
2Reliability
If conventional resins are used for conduit repair, then the adhesion to liner is improved, but the working time is reduced requiring quick application
Solution Approach 1:
The liner system is segmented into two layers with different resin compositions. The first layer uses a resin optimized for adhesion, while the second layer uses a resin optimized for working time and structural properties, allowing each layer to be optimized independently.
3Device complexity
If a single-layer liner is used, then the application process is simplified, but the repair thickness and strength are limited
Solution Approach 1:
The liner is segmented into multiple layers, each serving a specific function. The first layer provides adhesion and the second layer provides structural strength and thickness, allowing the repair to achieve greater thickness and strength while maintaining a relatively simple application process.
Solution Approach 2:
The liner uses composite material construction with at least two different materials or resin compositions in different layers. This composite structure enables the repair to achieve both adhesion and structural strength properties that a single material cannot provide.
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 system provides a robust and efficient repair by extending the working time with silica resin, ensuring better adhesion and structural integrity, facilitating repairs in hard-to-reach locations like beneath roadways or buildings without the need for excavation.
Implementation Method 1
a distal end of each has a section of hook and loop material. The method continues with coating a second sheet of the planar material that is included with the conduit repair liner with silica resin. The first sheet of the planar material connected to the second sheet of the planar material such that, after the step of coating the second sheet of the planar material, closing the second sheet of the planar material to substantially cover the first sheet of the planar material. The conduit repair liner is the wrapped around a carrier, engaging the hook and loop material to corresponding hook and loop material on a surface of the conduit repair liner to temporarily and removably hold the conduit repair liner to the carrier.
Implementation Method 2
The carrier and conduit repair liner are then positioned within the section of the plumbing and the carrier is inflated such that the first and second sheets of the planar material and the silica resin abuts an inside surface of the section of the plumbing.
Implementation Method 3
The impregnated composite liner adheres to the damaged inner surface of the conduit and hardens. Although silica resin works well for such repairs, silica resin does not adhere well to liners.
Data Source
AI summary
A conduit repair liner includes at least two sheets of planar material that are connected to each other as pages of a book and coated with silica resin then closed against one another to form the conduit repair liner for wrapping around a carrier. The conduit repair liner includes a feature for removably affixing the conduit repair liner to the carrier during positioning within a failed conduit.