Composite Pipe Lining for Curved Sewer Repair and Sealing
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Solution Overview
Problem
Existing methods for renovating underground sewer pipes are costly, time-consuming, and prone to creating new blockages and leaks due to the inability to absorb radial and axial forces, leading to irregular pipe reshaping and poor sealing.
Innovation Solution
An arrangement featuring a first textile tube woven in one piece, laminated on its outer wall, a felt tube wetted with a curable synthetic resin mixture, and a second silicone-coated textile tube for insertion and radial pressing, allowing for installation in curved pipes and enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional methods use impermeable preliners and felt hoses for pipe renovation, then installation is simplified, but the system cannot absorb radial or axial forces leading to poor sealing and irregular pipe reshaping
Solution Approach 1:
The patent uses a composite structure combining a textile tube with high tensile strength in the axial direction and a felt tube impregnated with synthetic resin. This composite material system provides both ease of installation and the ability to absorb radial and axial forces, resolving the contradiction between installation simplicity and sealing performance.
Solution Approach 2:
The patent changes the material parameters by using a textile tube with specifically high axial tensile strength rather than conventional impermeable materials. This parameter change enables the system to absorb axial forces during installation while maintaining ease of operation, thereby improving sealing performance without complicating the installation process.
2Ease of operation
If conventional methods use felt hoses that follow the old pipe contour, then installation is easier, but damaged contours are copied creating new blockages and leaks
Solution Approach 1:
The patent changes the mechanical properties of the lining material by using a textile tube with high axial tensile strength that can resist deformation. This allows the lining to maintain a smooth, regular contour independent of the old pipe's damaged shape, eliminating blockages and leaks while keeping installation simple through the flexible felt tube design.
3Strength
If hybrid liners with glass fiber reinforcement are used, then resistance and bending tensile strength increase, but flexibility decreases limiting installation to straight pipes only
Solution Approach 1:
The patent segments the reinforcement function into two parts: the textile tube provides axial tensile strength through its woven structure, while the felt tube provides flexibility for installation in curved pipes. This segmentation allows both high strength and high adaptability to be achieved simultaneously, resolving the contradiction between bending tensile strength and installation flexibility.
4Ease of manufacture
If conventional methods accept slight loss in cross-section, then renovation is simpler, but new sources of leaks and blockages form
Solution Approach 1:
The patent changes the material parameters by using a textile tube with high axial tensile strength that maintains dimensional stability. This allows the lining to preserve the original pipe cross-section without deformation, preventing leaks and blockages while keeping the renovation process simple through the straightforward installation method.
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 faster, cost-effective renovation with more durable and resilient pipe linings that can withstand higher static and dynamic loads, reducing the risk of leaks and blockages while maintaining a smooth inner surface.
Implementation Method 1
introducing a felt tube wetted with a curable synthetic resin mixture into the interior of the first textile tube
Implementation Method 2
The arrangement according to the invention may have a device for introducing heat, steam and/or light inside the second textile tube
Implementation Method 3
radially pressing the second textile tube and the first textile tube onto the pipe, in particular sewer pipe
Implementation Method 4
a felt tube woven in one piece on its outer wall with a release agent, preferably silicone, which does not adhere to the synthetic resin mixture
Data Source
Figure 1~1a
Figure 2
AI summary
The invention relates to an arrangement for mending a pipe, particularly a waste water pipe, which arrangement comprises the following elements: a first textile hose (ALg) woven in a single piece preferably laminated on the outer wall thereof, a felt hose (FS) arranged in the interior of the first textile hose (ALg) and wetted with a curable synthetic resin mixture, and a second textile hose (ALs), woven in a single piece and coated on its outer wall with a release agent, preferably silicon, not adhering to the synthetic resin mixture, for introduction into the felt hose (FS). The invention further relates to a method for mending a pipe, particularly a waste water pipe, preferably using the arrangement described.