Triple-Wall Pipe Coupling Structure for Stronger Inline Bellmouth Joints
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Solution Overview
Problem
The existing manufacturing methods for corrugated plastic pipes, particularly double and triple wall constructions, face limitations in the strength of bellmouth connectors and spigot couplings, which restrict the rated strength of the pipes due to the mechanical stress and sealing requirements, and the process is inefficient with high capital costs and reduced manufacturing speed.
Innovation Solution
A triple wall corrugated pipe design with a bellmouth connector and double wall spigot configuration, where the bellmouth connector features alternating double inner and outer wall portions and the spigot includes sealing valleys and support crests, allowing for a stronger mechanical connection and increased pipe section strength by forming these features inline during the manufacturing process using specific mold blocks and air pressure to maintain the outer sleeve wall away from the spigot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wall thickness and corrugation size are increased to provide additional strength, then the pipe strength is improved, but the manufacturing speed decreases and product cost increases
Solution Approach 1:
The pipe structure is segmented into three distinct walls: an inner smooth wall, an intermediate corrugated wall, and an outer smooth wall. This segmentation allows each wall to perform its specific function while maintaining overall structural integrity. The intermediate corrugated wall provides strength and rigidity, while the inner and outer smooth walls provide structural support and dimensional stability, enabling high strength without requiring excessive wall thickness that would slow manufacturing.
Solution Approach 2:
The invention uses a composite structure combining three different wall configurations (inner smooth wall, intermediate corrugated wall, outer smooth wall) to achieve superior mechanical properties. This composite approach allows the pipe to attain high strength and stiffness without uniformly increasing wall thickness throughout, thereby maintaining manufacturing efficiency while achieving the desired strength characteristics.
2Strength
If the bellmouth connector and spigot coupling strength is increased, then the rated strength of pipe sections is improved, but the device complexity increases
Solution Approach 1:
The invention merges the bellmouth connector and spigot coupling into a unitary integrated structure formed by a single continuous intermediate corrugated wall. This integration eliminates the need for separate coupling components, reducing device complexity while maintaining high coupling strength. The continuous corrugated wall provides both the structural connection and the mechanical coupling function in one element.
Solution Approach 2:
The intermediate corrugated wall serves multiple functions simultaneously: it provides structural strength and rigidity to the pipe, forms the bellmouth connector at one end, creates the spigot coupling at the other end, and maintains the triple-wall composite structure. This multi-functionality reduces the need for additional specialized components, simplifying the overall device while achieving high coupling strength.
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 solution significantly enhances the structural integrity and strength of the pipe couplings, increasing the rated strength of the pipe sections and maintaining a compressible seal, while reducing thermal deformation and simplifying the manufacturing process, resulting in a more robust and efficient corrugated pipe system.
Implementation Method 1
providing a positive pressure to maintain the plastic normally forming the outer sleeve wall of the pipe away from the spigot
Implementation Method 2
It is also known to use a vacuum tank and a sizing die to attach an outer tubular third wall to reinforce and increase the strength of the double wall corrugated pipe
Data Source
AI summary
A pipe coupling for triple wall corrugated plastic pipe includes a triple wall corrugated bellmouth connector that is of a unitary construction with one end of the corrugated plastic pipe. This bellmouth connector is of higher strength and in cooperation with the two wall corrugated spigot provides a high strength coupling. This coupling includes the bellmouth connector and spigot that are made inline with the corrugated pipe. A method for the manufacture of the pipe includes controlling of an air pressure on the outside of a formed two wall corrugated pipe as an exterior third wall is secured thereto.