T-Shaped Pipe Gripping Elements for Thrust Resistance
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Solution Overview
Problem
Mechanical joints in pipe coupling systems often fail to maintain a water-tight connection under hydraulic thrust forces, causing pipes to telescope apart, especially in pressurized municipal and industrial water systems.
Innovation Solution
A pipe joint restraint system featuring an annular retainer gland with T-shaped pockets and elongated, arcuate teeth that grip the pipe surface, combined with wedge members and threaded adjustment members to resist separation forces and ensure a secure seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical joint is used to couple pipe ends, then the pipes can be connected without flanged ends, but the connection cannot resist hydraulic thrust forces that cause pipes to telescope apart
Solution Approach 1:
The pipe coupling system is divided into distinct functional segments: the mechanical joint assembly (coupling body, follower ring, gasket) for basic connection, and the separate restraint assembly (retainer gland, gripping elements, teeth) for thrust resistance. This segmentation allows each component to perform its specialized function optimally while working together as an integrated system.
Solution Approach 2:
The retainer gland acts as an intermediary component that bridges the mechanical joint and the pipe surface. It provides a mounting structure for the gripping elements and transmits the gripping forces to the pipe, enabling the thrust-resistant connection without interfering with the sealing function of the mechanical joint.
2Force
If gripping elements with teeth are used to resist thrust forces, then hydraulic thrust resistance is improved, but the complexity of the device increases
Solution Approach 1:
Multiple gripping elements with teeth are arranged circumferentially around the pipe and merged into a single restraint system mounted on the retainer gland. This combines multiple simple gripping actions into a unified thrust-resistant connection, achieving high force resistance without requiring a complex individual gripping mechanism for each element.
Solution Approach 2:
The retainer gland serves multiple functions: it provides structural support for the gripping elements, acts as a mounting platform on the pipe surface, and serves as the attachment point for the follower ring. This multi-functionality reduces the number of separate components needed, thereby reducing overall device complexity while maintaining thrust resistance.
3Reliability
If the tooth bites into the pipe surface to resist separation, then the connection reliability is improved, but the pipe surface may be damaged
Solution Approach 1:
The gripping elements are designed with teeth that can bite into the pipe surface only when necessary to resist thrust forces. During normal installation and sealing operations, the gripping elements remain in a retracted or non-engaged position, preventing any damage to the pipe surface. The biting action is activated only when hydraulic thrust forces are applied, providing protection during critical operations.
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 effectively resists hydraulic thrust forces, maintaining a water-tight connection and preventing pipe separation by embedding teeth into the pipe surface, thereby enhancing the reliability of pipe couplings in pressurized systems.
Implementation Method 1
The tooth is configured to engage the pipe surface when the gripping element is moved toward the pipe, and to thereafter bite into the pipe surface in response to thrust forces
Implementation Method 2
The T-shaped body with fulcrum creates a lever arm that amplifies the gripping force applied by the adjustment member to the tooth on the pipe surface
Implementation Method 3
a nut to receive torque to adjust the bolt. A rotation of the bolt, such as via nut, causes the gripping element to move radially toward or away from the pipe surface
Data Source
AI summary
A pipe gripping element has a T-shaped body including an elongated cross member and a base member extending from the cross member. The cross member includes an upper portion and an opposite lower arcuate portion, and the base member includes an upper portion that is slanted relative to the cross member upper portion to define a fulcrum. An elongated, arcuate tooth extends outwardly from the arcuate portion. A pipe joint restraint includes an annular retainer gland, a plurality of pockets circumferentially spaced around the gland, and a plurality of the pipe gripping elements operably associated therewith for gripping and restraining a pipe.