Nested Square Tube Coupler for Helical Pile Torsion
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Solution Overview
Problem
Existing couplers for helical piles require time-consuming and costly forging processes, and conventional square tubing solutions struggle to balance fitment and torsional capacity, often resulting in misalignment and interference issues.
Innovation Solution
A coupler design utilizing nested square tubing with specific inner and outer widths and corner radii, allowing for a clearance fit that meets torsional capacity requirements without the need for upset forging, and enabling the use of standard gauge tubing for reduced manufacturing costs and improved fitment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional square tubing with corner radii is used for couplers, then manufacturing is simplified, but fitment and alignment issues occur due to interference between corners
Solution Approach 1:
The coupler is divided into multiple segments: an outer tube and an inner tube, each with specific dimensional characteristics. The outer tube has larger corner radii for easier manufacturing, while the inner tube has smaller corner radii for precise fitment. This segmentation allows each component to optimize its geometry for its specific function, resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The inner tube is nested within the outer tube, creating a concentric assembly. This nesting arrangement allows the outer tube to provide structural support and accommodate larger corner radii for easier manufacturing, while the inner tube fits precisely within the outer tube's interior recess, ensuring accurate fitment and alignment. The nested configuration resolves the geometric conflicts that would arise if a single tube had to satisfy both manufacturing ease and precision requirements.
2Strength
If forged upset couplers are used to join square bar stock, then connection strength is improved, but manufacturing time and cost increase significantly
Solution Approach 1:
The complex forging process is extracted and replaced with a simpler assembly process. Instead of forging the coupler directly onto the square bar stock, the design uses pre-fabricated nested tubes that are assembled together and secured with bolts. This extraction of the forging step eliminates the time-consuming and costly custom forging equipment requirement while maintaining connection strength through the bolted nested tube assembly.
Solution Approach 2:
The design replaces expensive, customized forged couplers with standard gauge nested tubes that can be manufactured more economically. While individual coupler units may be simpler constructions, the overall system benefits from reduced manufacturing costs and time, allowing for more efficient production and potential replacement if needed, without requiring specialized forging infrastructure.
3Reliability
If custom forged equipment is used for coupler production, then connection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The nested tube coupler design uses standard gauge tubing that can be manufactured with conventional equipment, making the manufacturing process universal and accessible. The design does not require specialized custom forged equipment, yet achieves reliable connections through the bolted assembly of the nested tubes. This universality allows the same basic components and processes to be used across different production facilities without requiring proprietary equipment.
Data Source
AI summary
A coupler for a helical pile system is described. The coupler includes at least two sections of square tube. A first section is nested within and affixed to the second section. The first section may further include an inner width by which the first section is configured to receive two pieces of rectangular bar stocks of a helical pile system. The at least two sections each include at least two pairs of aligned through holes, for receiving first and second bolts. By the first bolt and second bolts, the two pieces of rectangular bar stock may be coupled. The first section may thus transfer torsion between the two pieces of rectangular bar stock, such as when screwing the helical pile system into the earth.