In-Place Asbestos Concrete Pipe Encapsulation With HDPE Lining
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Solution Overview
Problem
Asbestos cement pipes in the ground face structural degradation, breakage, and contamination risks due to erosion and asbestos exposure during removal, leading to high costs and health hazards, especially in coastal areas with wet conditions, where traditional removal methods are inefficient and pose environmental risks.
Innovation Solution
A method and system for in-place encapsulation of asbestos concrete pipes using a scribing head with progressively increasing blades to separate the pipe, followed by the application of a moisture-activated expanding urethane foam reinforcement material, allowing a new HDPE pipe to be inserted without excavation, thereby encapsulating the asbestos and preventing further contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional removal methods are used for asbestos pipes, then the pipes can be replaced, but extensive excavation is required, increasing construction cost and time
Solution Approach 1:
The patent extracts the problematic asbestos pipe material from the ground through trenchless technology, removing only the hazardous component while leaving the functional pipe structure in place. This allows replacement of the pipe lining without extensive excavation, resolving the contradiction between reliable pipe replacement and construction efficiency
Solution Approach 2:
The patent implements nesting by inserting a new HDPE pipe liner inside the existing asbestos pipe structure. The new liner is pulled through the old pipe and expanded to fit, creating a nested configuration that restores pipe functionality without requiring removal of the outer pipe structure, thereby maintaining reliability while improving productivity
2Object-generated harmful factors
If asbestos pipes are excavated and manually handled, then they can be disposed of, but asbestos may become airborne, creating health risks
Solution Approach 1:
The patent extracts the asbestos-containing pipe material in-place through a sealed trenchless system, removing the hazardous material without exposing it to the environment. This extraction method prevents asbestos from becoming airborne during removal, addressing the health risk while managing disposal complexity
Solution Approach 2:
The patent introduces a sealed containment system as an intermediary between the asbestos pipe and the environment. The trenchless equipment and sealing mechanisms act as intermediaries that allow removal of asbestos material without direct exposure, preventing contamination while simplifying the disposal process
3Reliability
If pipes are removed and replaced in coastal areas with high water tables, then new pipes can be installed, but dewatering is required, increasing cost and time
Solution Approach 1:
The patent extracts the need for dewatering by implementing trenchless technology that operates without exposing the pipe to the surrounding wet environment. The new liner is installed through the existing pipe structure, eliminating the need to pump out groundwater, thus reducing time loss while maintaining installation feasibility
Solution Approach 2:
The patent uses nesting to install the new HDPE liner inside the existing pipe without disturbing the external environment. This nested installation method allows work to proceed in wet coastal conditions without dewatering, as the installation occurs within the protected inner space of the existing pipe structure
4Object-affected harmful factors
If asbestos pipes are left in the ground, then property values may depreciate, but removal creates potential soil and water contamination
Solution Approach 1:
The patent extracts the asbestos pipe material in-place using trenchless technology, removing the hazardous material that causes contamination risk while preserving the pipe's functional position. This extraction eliminates the contamination threat to soil and water while maintaining property value by avoiding extensive excavation and landscape disruption
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
This approach allows for safe, economic, and environmentally friendly reinforcement of underground asbestos pipes, minimizing disruption, avoiding hazardous material disposal, and ensuring long-term containment of asbestos without the need for dewatering, thus reducing construction and remediation costs while protecting ecosystems.
Implementation Method 1
an internal guide head with scribing elements for scribing and separating the walls of the old pipe
Implementation Method 2
application of a moisture-activated expanding urethane foam reinforcement material
Implementation Method 3
expanding urethane foam reinforcement material
Implementation Method 4
allowing a new HDPE pipe to be inserted
Data Source
AI summary
A process and system is provided to allow rehabilitation of asbestos concrete (AC) pipe to remain in place while rendering the AC pipe harmless, in a manner that protects the ecosystem and saves huge amounts of money lost to bypass, digging, remediation and disposal. The method and system provide for encapsulation of the old AC pipe in place without any digging or disruption to the surrounding area. No dewatering is required, saving the costs required with dewatering. There is minimal disruption to the community's use of the piping system while completing the repair, as such repairs can be done on a manhole-to-manhole basis. Finally, there are no hazardous material disposal requirements, or the costs associated therewith.