Resin-Impregnated Textile Lining Hose for Pipe Renovation
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Solution Overview
Problem
Pressure pipes weakened by corrosion or other forms of degradation cannot adequately withstand high transport pressures and external mechanical loads, requiring costly and labor-intensive replacement or renovation methods.
Innovation Solution
A lining hose with a flexible textile sheet formation impregnated with resin, which forms a self-supporting pipe upon curing, providing a gapless and full-surfaced bonding connection to the inner surface of the pressure pipe, allowing for renovation without the need for additional structural support from the old pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lining hose is used for renovating a pressure pipe, then the hose can be drawn into the old pipe and bonded to the inner wall, but the renovated pipe cannot adequately withstand high pressures and external mechanical loads if the old pipe is too greatly weakened
Solution Approach 1:
The lining hose comprises a multi-layer composite structure with a textile sheet formation impregnated with resin, combined with a foam layer and an adhesive layer. This composite structure provides both flexibility for installation and high mechanical strength for load bearing, enabling the renovated pipe to withstand high pressures and external mechanical loads independently of the old pipe's condition.
Solution Approach 2:
The resin undergoes a parameter change from liquid state during installation to cured solid state after hardening. In the liquid state, the resin allows the hose to be flexible and drawable into the old pipe. After curing, the resin transforms into a rigid structure that provides high mechanical strength and enables the hose to function as a self-supporting pressure pipe capable of withstanding high loads.
2Reliability
If the old pipe is greatly weakened by corrosion, then conventional renovation methods require drawing a new self-supporting pipe or exchanging the complete pressure pipe conduit, but this entails significant increase in cost and effort
Solution Approach 1:
The lining hose is drawn into and nested within the existing old pipe conduit. The hose forms a new self-supporting pressure pipe inside the old pipe, which can be bonded to the inner wall of the old pipe. This nested approach allows renovation without removing the old pipe structure, significantly reducing effort and cost compared to complete replacement while ensuring structural integrity through the self-supporting design.
3Strength
If a thick second layer is used to form a self-supporting pipe, then the hose can withstand mechanical loads independently, but the hose becomes less flexible during installation
Solution Approach 1:
The resin in the second layer undergoes a parameter change from liquid to cured solid state. During installation, the resin is in liquid form, allowing the hose to remain flexible and adaptable to the old pipe's contour. After installation, the resin cures and transforms into a rigid structure, enabling the thick second layer to provide self-supporting capability and mechanical load bearing strength.
Solution Approach 2:
The hose transitions from a dynamic, flexible state during installation to a static, rigid state after curing. The textile sheet formation and resin combination allows the hose to be flexible when the resin is liquid, facilitating easy installation. Once the resin cures, the hose becomes rigid and self-supporting, capable of withstanding mechanical loads independently.
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 the renovation of weakened pressure pipes to withstand mechanical loads and maintain pressure integrity with reduced effort and cost, extending the service life of the pipe and preventing leaks, while allowing for direction changes without significant cross-sectional reduction.
Implementation Method 1
the second layer has a thickness of at least 3 mm, wherein the textile sheet formation and the resin are selected such that the lining hose forms a self-supporting pipe, in a condition in which the resin is cured
Implementation Method 2
a) an adhesive layer, which in the cured condition is suitable for creating a bonding connection between the self-supporting pipe and an inner surface of the pressure pipe to be renovated
Data Source
AI summary
The subject matter of the invention is a lining hose as a composite hose for lining a pressure pipe to be renovated, comprising at least one first layer and a second layer which adjoins the first layer, the first layer forming a substantially fluid-tight and/or gas-tight diffusion barrier and the second layer being a textile fabric soaked in a resin and being provided for an all-over adhesive connection to an inner wall of the pressure pipe to be renovated, the lining hose being flexible in a state in which the resin has not cured. The second layer is at least 3 mm thick, the textile fabric and the resin being selected such that the lining hose forms a self-supporting pipe in a state in which the resin has cured. The invention also relates to a method for renovating a pressure pipe using such a lining hose and a corresponding renovated pressure pipe.