Segmented Grip Ring Structure for Easier Plastic Pipe Joint Restraint
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Solution Overview
Problem
Existing plastic pipe sealing and restraint systems are cumbersome to install, require substantial labor, and are costly due to the need for external clamping devices and complex assembly processes, which also increases the risk of human error and reduces the reliability of pipe joints.
Innovation Solution
A new restraint system for plastic pipes that includes a single-piece, ring-shaped casing with a segmented grip ring providing both radial and axial spring action, which is integral to the pipe joint and simplifies installation by eliminating the need for external clamping devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external clamping devices are used for restraint, then pipe joint restraint function is achieved, but device complexity and installation labor increase
Solution Approach 1:
The patent combines the restraint function with the sealing gasket into a single integrated component. The grip ring is embedded within the elastomeric gasket, eliminating the need for separate external clamping devices. This merging of functions reduces device complexity while maintaining the restraint capability, as the grip ring provides the necessary gripping force on the spigot through the integrated structure.
Solution Approach 2:
The sealing gasket is designed to perform multiple functions simultaneously: sealing (through the elastomeric material conforming to the socket groove), restraining (through the grip ring gripping the spigot), and positioning (through the integrated structure). This multi-functionality eliminates the need for separate restraint devices, reducing overall system complexity while achieving reliable pipe joint restraint.
2Reliability
If homogeneous rubber gasket with stiffening band is used, then gasket integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The gasket is segmented into distinct functional zones: the elastomeric sealing portion and the embedded grip ring portion. This segmentation allows each component to be manufactured separately using optimized processes (molding for the elastomeric part, forming for the metal grip ring) and then assembled through embedding, improving overall manufacturability while maintaining gasket integrity.
Solution Approach 2:
The gasket employs composite construction by embedding the metal grip ring within the elastomeric material. This composite structure combines the flexibility and sealing capability of rubber with the strength and rigidity of metal, achieving superior gasket integrity without requiring complex homogeneous material formulation or processing.
3Ease of operation
If segmented grip ring with flexible hinge regions is used, then ease of installation is improved, but structural complexity increases
Solution Approach 1:
The grip ring incorporates flexible hinge regions that allow dynamic movement and deformation during installation. These hinge regions enable the grip ring to flex open for insertion and then spring back to its original configuration to grip the spigot, providing ease of installation through controlled deformation and elastic recovery without requiring complex mechanical actuation mechanisms.
4Reliability
If grip ring is properly centered and engaged, then joint reliability is improved, but installation precision requirements increase
Solution Approach 1:
The grip ring design incorporates self-centering features where the flexible hinge regions and elastic recovery mechanism automatically guide the grip ring into proper central position during installation. The structure itself provides the centering function through its geometric design and material properties, eliminating the need for external centering tools or high-precision alignment procedures.
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 system enhances the integrity of pipe joints by ensuring proper engagement and centering of the grip ring, reducing the risk of leaks and failure due to abrasion, and simplifies installation, thereby reducing costs and human error.
Implementation Method 1
The flexible hinge regions supply the restraint mechanism with both radial and axial spring action
Data Source
AI summary
A mechanism for restraining pipe against both internal and external forces at a pipe or fitting connection and to join and seal at least two pipes to form a pipeline featuring an improved restraint mechanism. The restraint mechanism includes a circumferential casing and a companion grip ring, both of which are received within a mating groove provided in the belled end of a female pipe. The grip ring is made up of a series of arc-shaped gripping elements which are interconnected by discrete elastomeric segments. The gripping elements are separated by gaps so that a flexible hinge region is created by the elastomeric segments between adjacent gripping elements. The elastomeric segments provide both axial and radial spring action to the assembly.