Flexible Tubular Lining Material with Removable Strip Members for Bent Pipeline Insertion
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Solution Overview
Problem
Conventional pipeline lining methods face difficulties in inserting materials into sections bent at a right angle due to eversion issues and increased contact resistance, leading to material damage and reduced quality.
Innovation Solution
A flexible tubular lining material impregnated with thermosetting resin, equipped with a removably attached elastic and rigid strip member, such as a steel belt, which allows for easy insertion and protection during bending sections, preventing stretching and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lining material is pushed in while being everted, then insertion is possible, but eversion does not occur in sections bent at a right angle or close to a right angle
Solution Approach 1:
The lining material is preliminarily folded into a compact state before insertion, allowing it to be pushed through bent sections. The folding is performed in advance so that the material can navigate right-angle bends without requiring eversion, and then expands to its cylindrical form after insertion to line the pipeline effectively
2Ease of operation
If a drawing-in method is used, then insertion is possible, but contact resistance increases and the lining material becomes heavier and unable to be drawn in
Solution Approach 1:
The lining material is preliminarily folded into a compact, lightweight state before insertion. This folding reduces the effective weight and contact resistance during the drawing-in process, allowing the material to be pulled through bent sections without becoming too heavy. After insertion, the material expands to its full cylindrical form to provide the necessary lining function
3Productivity
If drawing in is continued forcibly, then insertion may be achieved, but the lining material is stretched and damaged, reducing product quality
Solution Approach 1:
The lining material is preliminarily folded to create a compact form that can be easily inserted without forcible drawing. This pre-folding allows rapid insertion while preventing stretching and damage, as the material is already in a configuration suitable for navigation through bent sections. After insertion, it expands to its final form, ensuring high product quality
Solution Approach 2:
The physical state of the lining material is changed from a compact folded form during insertion to an expanded cylindrical form after insertion. This parameter change allows the material to be easily inserted without damage while maintaining its structural integrity and quality for the lining function
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
Enables smooth and damage-free insertion into pipelines with multiple right-angle bends, reducing lining work time and ensuring high-quality pipeline repair.
Implementation Method 1
heating the lining material to cause the thermosetting resin thereof to be cured
Implementation Method 2
the lining material is heated while being expanded by air pressure
Data Source
AI summary
A flexible tubular lining material impregnated with a thermosetting resin is folded and bound with binding members to provide a reduced width. Two elastic and rigid strip members are inserted into loop members attached to the lining material and are removably attached so as to sandwich the lining material. During pipeline lining work, the lining material to which the strip members have been attached is first inserted into a lateral pipe from a main pipe. The strip members are then removed from the lining material so that the lining material may remain inside the pipeline. The strip members are extracted from the pipeline, and the lining material is then made to expand via application of pressure from the inside. While kept in contact with the inner peripheral surface of the pipeline, the lining material is heated in order to cure the thermosetting resin thereof.