Pipe Splitting Head with Hoop Tensioning for Ductile Pipe
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Solution Overview
Problem
Existing methods for replacing pipes, particularly those made from ductile materials or configurations like corrugated steel, face difficulties due to their ductile properties, which make them challenging to split effectively, especially when they are thin-walled or have a configuration that leads to accordion-like collapse during splitting.
Innovation Solution
A pipe splitting system featuring a fixed splitting blade with a leading tapered portion and protruding hoop tensioning features, combined with a pneumatic hammer and cable pulling mechanism, is used to create a progressive cut and hoop stress, facilitating controlled splitting of ductile and corrugated pipes by distributing cutting forces evenly and reducing crumpling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional cutter wheels are used to split ductile iron pipe, then the pipe can be split, but the pipe may crumple or collapse like an accordion due to insufficient axial stiffness
Solution Approach 1:
The system performs preliminary actions by first inserting an expander into the pipe to provide axial stiffness and prevent collapse before the splitting operation begins. This preparatory measure ensures the pipe maintains its structural integrity throughout the subsequent cutting process.
Solution Approach 2:
The expander acts as an intermediary element between the pipe wall and the cutter wheels. It provides the necessary support and stiffness to the pipe structure, enabling the cutter wheels to split the ductile iron pipe without causing collapse or crumpling.
2Productivity
If pipe wall thickness is reduced to enable upsizing, then larger diameter replacement pipe can be installed, but the pipe becomes more difficult to split due to reduced rigidity
Solution Approach 1:
The expander is inserted into the thin-walled pipe before splitting to provide temporary axial stiffness. This preliminary support compensates for the reduced rigidity of thinner walls, enabling successful splitting operations on pipe configurations that would otherwise be too difficult to cut.
Solution Approach 2:
The system changes the mechanical parameters of the pipe by introducing the expander, which alters the axial stiffness characteristic. This parameter modification enables the splitting operation to proceed successfully on thin-walled pipe that lacks sufficient inherent rigidity.
3Stability of the object's composition
If expander is inserted to provide axial stiffness, then pipe collapse is prevented, but the device complexity increases
Solution Approach 1:
The expander and cutter wheels are merged into a single integrated splitting head assembly. This combination allows both functions (providing axial stiffness and performing the split) to be accomplished by one device, reducing overall system complexity compared to using separate components.
Solution Approach 2:
The splitting head serves multiple functions: it provides axial stiffness through the expander, supports the cutter wheels during operation, and guides the cutting process. This multi-functionality reduces the need for additional separate devices, simplifying the overall system.
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 splits challenging pipe materials and configurations by providing a progressive cut and consistent tension, reducing the likelihood of crumpling and enabling efficient replacement with larger diameter pipes while maintaining flow capacity.
Implementation Method 1
In one embodiment, the splitter is moved through the pipe as a result of forces provided by a pneumatic hammer from behind the splitter.
Implementation Method 2
In one embodiment, the splitter is also pulled through the pipe using a cable.
Data Source
AI summary
A device and method for pipe replacement is shown. One advantage of devices and methods provided includes a splitting blade that provides a progressive cut into challenging pipe configurations such as ductile materials, thin walled pipes, corrugated pipes, or combinations of these properties. A pipe splitter and method is also shown that includes at least one hoop tensioning feature protruding from a body portion to pull the pipe against at least one splitting blade and increase splitting effectiveness.