Winch Boom Pulley Layout for Small-Pit Pipe Bursting
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Solution Overview
Problem
Existing trenchless pipe replacement methods face challenges in minimizing the size of entry and exit pits due to limited space for operating cutting tooling, particularly in small diameter gas pipe replacements, which can lead to damage and inefficiencies in pipe bursting operations.
Innovation Solution
A winch boom system with pivoting pulleys and a limiter mechanism is used to facilitate the deployment of a bursting tool, allowing it to be pulled at an angle into the pit, reducing the need for extraction cages and minimizing pit size, while using a polymeric pulley surface to protect the tool and prevent pipe jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional trenchless pipe replacement methods are used, then pipe replacement can be performed without excavation, but the entry and exit pits become too large due to space requirements for cutting tooling operations
Solution Approach 1:
The patent introduces a boom structure that extends the operational space vertically and laterally beyond the pit boundaries. The boom allows cutting tools to be positioned and operated from above and outside the pit, effectively adding dimensional space for tooling operations without increasing pit size.
Solution Approach 2:
The boom acts as an intermediary mechanical structure between the winch system and the bursting/cutting tools. It provides the necessary reach and positioning capability, allowing tools to operate in confined pit spaces while being controlled from a more spacious external location.
2Productivity
If the pit size is minimized, then less road repair is needed, but there is insufficient space to operate cutting tooling for pipe replacement
Solution Approach 1:
By utilizing the boom structure that operates in vertical and lateral dimensions outside the pit, the system eliminates the need for additional horizontal space within the pit, thereby minimizing pit size and reducing road repair requirements while maintaining full cutting tooling functionality.
Solution Approach 2:
The boom is designed with adjustable and movable components that can dynamically reposition cutting tools to various locations around the pipe. This dynamic positioning capability allows efficient tool operation in the limited space provided by a minimized pit configuration.
3Reliability
If a polymeric pulley surface is used, then the bursting tool is protected from damage and pipe jamming is prevented, but the pulley surface requires specific material properties
Solution Approach 1:
The patent specifies particular material parameters for the polymeric pulley surface, including friction coefficients, hardness, and elasticity, to optimize both tool protection and manufacturing feasibility. These parameter specifications balance the need for reliable tool protection with practical manufacturing considerations.
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 enables efficient pipe replacement with reduced pit size and minimized damage to the bursting tool, allowing for easier tool removal and new pipe attachment, enhancing operational efficiency and reducing post-repair roadwork.
Implementation Method 1
The polymeric surface may function to reduce damage to the bursting tool
Data Source
AI summary
A pipe replacement system and method are shown. Configurations are shown that include a pulley that does not damage a bursting tool, as the bursting tool is pulled into a pit. Configurations are also shown that include a boom that does not need an extraction cage for the bursting tool.