Mesh Stent Expansion for Partially Collapsed Pipe Relining
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Solution Overview
Problem
Existing pipe repair methods for partially collapsed pipes face issues such as overlapping replacement pipes that interfere with relining and reduce hydrodynamic conductivity, and the need for prefabricated support plates that are not adaptable to specific pipe diameters, leading to inefficiencies and limitations in repair effectiveness.
Innovation Solution
A method using a mesh stent fitted around an actuation assembly with arms that expand to restore the pipe to a non-collapsed form, minimizing excavation and allowing for uniform expansion without overlapping edges, thus facilitating relining and maintaining high hydraulic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil shaped replacement pipe is used to repair partially collapsed pipes, then the pipe can be straightened and supported, but the overlapping portion interferes with relining and reduces hydrodynamic conductivity
Solution Approach 1:
The replacement pipe is divided into multiple coil sections that can be independently inserted and expanded. Each coil section is separated from others, eliminating overlapping portions while providing continuous support along the damaged pipe section.
Solution Approach 2:
Instead of expanding a single continuous coil that must overlap to achieve full coverage, the invention uses multiple discrete coil sections that are inserted sequentially. The coils are designed to abut against each other without overlapping, inverting the traditional approach of using a single overlapping coil.
2Ease of operation
If a prefabricated support plate is used for pipe repair, then the pipe can be repaired with minimal excavation, but the support plate must be manufactured for specific pipe diameters leading to longer wait times
Solution Approach 1:
The support structure transitions from a static prefabricated component to a dynamic system where coils are inserted in a compressed or coiled state and then expanded in-situ. This allows the same device to adapt to different pipe diameters without requiring pre-manufacturing for each specific size.
Solution Approach 2:
The coil sections are designed with variable expansion ratios, allowing them to be inserted in a compact form and expanded to match the specific diameter of the damaged pipe. This parameter change from compressed to expanded state eliminates the need for prefabrication at specific diameters.
3Ease of operation
If a coil shaped replacement pipe is used, then the pipe can be repaired without extensive excavation, but the replacement pipe is difficult or impossible to click into place if the pipe cannot be fully repaired
Solution Approach 1:
The replacement system is segmented into multiple independent coil sections that can be inserted and expanded separately. This allows the repair to be performed in stages, with each coil section addressing a specific damaged area, making partial repairs feasible and straightforward.
Solution Approach 2:
The coil sections are designed to be inserted in a flexible, compressed state that allows navigation through the pipe even when the pipe is partially collapsed. Once inserted, the coils expand dynamically to provide support, accommodating varying degrees of pipe damage without requiring complete repair.
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 method enables quick, efficient, and minimally disruptive repair of partially collapsed pipes with reduced risk to relining layers and improved flow resistance, allowing for effective restoration and maintenance without the need for replacement pipes or extensive excavation.
Implementation Method 1
a mesh stent for use in repairing a partially collapsed pipe
Implementation Method 2
at least one arm extends outwards to exert a force against the mesh stent and the interior surface of the pipe
Data Source
AI summary
The present disclosure relates to a method for repairing a partially collapsed pipe. The method comprises fitting a mesh stent around the outside of an actuation assembly of a pipe repair apparatus, and positioning the pipe repair apparatus within a portion of the pipe, at least a part of the portion of the pipe being partially collapsed. The method also comprises causing actuation between a retracted configuration and an extended configuration such that the partially collapsed part of the pipe changes from a partially collapsed form towards a non-collapsed form. The method also comprises removing the pipe repair apparatus from the pipe and leaving the mesh stent in the portion of the pipe.