Helical Pile Coupling Sleeve for Torsional Load Distribution
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Solution Overview
Problem
Conventional pile couplings fail to effectively distribute torsional loads during helical pile installation, leading to elongation of side holes and weld failure, which compromises the stability and reliability of the pile structure.
Innovation Solution
A pile assembly design featuring interlocking end fittings and a sleeve with through holes to secure the sleeve to the pile sections, allowing for better distribution of torsional loads and reducing the reliance on pins and welds for torque transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pile couplings use pins and welds to connect pile sections, then the pile sections can be joined together, but the torsional loads cause elongation of side holes and weld failure
Solution Approach 1:
The coupling device is segmented into a sleeve portion and end fittings that can be separately assembled to the pile sections. The sleeve overlays the engaged ends and is secured through holes, while the end fittings provide the interlocking connection. This segmentation allows each component to handle specific aspects of the torsional load independently, preventing concentration of stress in single critical points like welds or pins.
Solution Approach 2:
The sleeve acts as an intermediary element between the pile sections. It overlays the engaged ends of the pile sections and is secured through holes, distributing the torsional loads across a broader area. The sleeve mediates the connection by working together with the end fittings to create a more robust joint that better resists the twisting forces during installation.
2Strength
If additional forged ends are added to improve torque transfer, then the torsional load distribution improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The coupling device merges the functions of connection and torque transfer into a unified assembly of the sleeve and end fittings. Rather than adding separate forged ends to the pile sections, the design combines the coupling and torque resistance functions in the sleeve-end fitting assembly that works together to distribute and resist torsional loads.
Solution Approach 2:
The sleeve and end fittings serve multiple functions: they connect the pile sections together, distribute torsional loads, and provide a secure mechanical joint. This multi-functionality eliminates the need for additional specialized components like forged ends, as the same coupling assembly handles both connection and torque transfer responsibilities.
Data Source
AI summary
A pile includes a first pile section having a first end that engages a supporting medium and an opposing second end. A first end of a second pile section is engageable with the second end of the first pile section, each of the first and second pile sections having mating end fittings that create an in fit. A sleeve overlays the first and second engaged ends of the first and second pile sections. At least one through hole aligned with at least one corresponding through hole of the first pile section is sized for receiving a fastener far securing the sleeve to the first pile section. In another version, the ends of the pile section are engaged in contact while the overlaying sleeve has a pair of interlocking sleeve or coupler portions that are configured to provide torsional resistance. Additional pile sections can be sequentially attached to the second pile section.