Moldable PVC Tee Fitting for Internal Pipe Junction Sealing
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Solution Overview
Problem
Existing trenchless repair methods for sealing junctions between main pipelines and lateral service lines are time-consuming and expensive due to complex setups, difficulty in accessing the service end of lateral lines, and inconsistent sealing results from temperature and moisture variations, especially when external access is impractical.
Innovation Solution
A PVC repair tee fitting with a tee-shaped inflatable bladder and heating gas input is used to mold and seal the damaged junction from within the main pipeline, utilizing a robot for precise placement and controlled inflation to match the internal diameter of the pipeline, supplemented by sealing gaskets for a reliable seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional trenchless repair methods are used, then external access is avoided, but the service end of lateral lines is difficult to access and sealing is inconsistent
Solution Approach 1:
The patent inverts the conventional approach by accessing the lateral line junction from the main line interior rather than from the external service end. The moldable fitting is introduced through the main line and positioned at the junction internally, eliminating the need to access the difficult-to-reach service end while achieving reliable sealing through controlled molding against the junction surfaces.
Solution Approach 2:
The patent introduces a moldable fitting as an intermediary element that is heated and molded to create a reliable seal at the lateral line junction. This intermediary fitting acts as a mediator between the main line and lateral line, providing consistent sealing without requiring direct access to the service end or dealing with the inconsistencies of external sealing methods.
2Ease of operation
If complex setup procedures are used for trenchless repair, then external access is avoided, but the repair process becomes time-consuming
Solution Approach 1:
The patent segments the repair process into simple, sequential steps: introducing the collapsed fitting through the main line, positioning it at the junction, heating it to make pliable, inflating it to expand and seal, and cooling it to set the seal. This segmentation eliminates complex setup procedures while maintaining the benefit of avoiding external access, significantly reducing repair time.
Solution Approach 2:
The moldable fitting performs self-service by automatically sealing to the junction surfaces through controlled heating and inflation. The fitting expands to conform to the internal geometry of the junction, creating its own seal without requiring complex external equipment or procedures, thereby reducing both setup complexity and repair time.
3Ease of manufacture
If traditional repair methods with external access are used, then excavation is required, but environmental impact increases and cost increases
Solution Approach 1:
The patent inverts the traditional repair approach by performing the repair from the interior of the main line rather than requiring external excavation. The moldable fitting is introduced through the main line and seals the lateral line junction internally, completely avoiding the need for trenching or excavation, thereby eliminating environmental disruption while maintaining full repair accessibility.
4Reliability
If moldable fitting with heating is used, then reliable seal is achieved, but heating equipment and controlled inflation are required
Solution Approach 1:
The patent merges the heating and inflation functions into a single integrated process. The fitting is heated to make it pliable, then inflated to expand and seal against the junction surfaces simultaneously. This combining of functions achieves reliable sealing while minimizing device complexity, as the heating and inflation can be performed through simple conduits introduced with the fitting rather than requiring separate complex systems.
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 provides a quick, cost-effective, and reliable seal at the junction without external access, reducing the risk of leaks and obstructions, and minimizing environmental impact by avoiding extensive excavation.
Implementation Method 1
a second end fitting fluidly connected to the second end coupling, the second end fitting including a heating gas input
Implementation Method 2
a tee-shaped inflatable bladder with open main line ends and a closed branch end
Data Source
AI summary
The presently disclosed technology generally relates to trenchless technology for the repair and reinforcement of pipe tee junctions. More specifically, the presently disclosed technology allows for quickly and inexpensively sealing damaged junctions between a main pipeline and lateral service line(s) extending therefrom with consistent results. This is especially needed in situations where it is difficult or impractical to obtain access to the service end of a lateral service line. The present disclosed method and apparatus for sealing damaged tee junctions between a main pipeline and one or more lateral service line(s) extending therefrom uses exclusive access from inside the main pipeline.