Tapered Anti-Reverse Coupler Assembly for Foundation Shaft Retention
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Solution Overview
Problem
Conventional foundation support systems using helical piers face issues with couplers separating under reverse rotation or uplift forces, compromising the structural integrity of the foundation.
Innovation Solution
A coupler assembly with conical-shaped main bodies and anti-reverse rotation elements, such as bolts, that prevent separation by allowing limited relative rotation and distributing forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional couplers are used in foundation support systems, then the system allows relative rotation between shafts during installation, but the couplers separate under reverse rotation or uplift forces
Solution Approach 1:
The coupler assembly is divided into separate components: a first coupler on the first shaft and a second coupler on the second shaft, connected by a bridge element. This segmentation allows each component to perform its specific function - the couplers enable relative rotation during installation while the bridge element prevents separation under reverse rotation or uplift forces.
Solution Approach 2:
The bridge element acts as an intermediary component connecting the first and second couplers. It transfers loads between the shafts and prevents the couplers from separating under reverse rotation or uplift forces, while still allowing the necessary relative rotation during installation.
2Ease of manufacture
If couplers are designed to allow relative rotation, then installation is simplified, but structural integrity is compromised under reverse rotation
Solution Approach 1:
The assembly is segmented into distinct functional components: couplers for rotational freedom during assembly and a bridge element for load transfer and anti-separation. This segmentation enables simplified assembly while maintaining structural integrity under reverse rotation through the bridge element's connection.
Solution Approach 2:
The bridge element merges the first and second couplers into a unified assembly that combines the rotational freedom of the couplers with the load-bearing capacity needed to prevent separation under reverse rotation or uplift forces.
3Device complexity
If conventional coupler designs are used, then the structure is simpler, but the system fails under uplift forces
Solution Approach 1:
The coupler system is segmented into a first coupler, second coupler, and bridge element. This segmentation distributes the uplift force resistance across multiple components, with the bridge element specifically designed to resist uplift forces while the couplers maintain rotational freedom.
Solution Approach 2:
The coupler assembly functions as a composite structure combining different functional elements - the couplers provide rotational flexibility while the bridge element provides uplift resistance. This composite approach maintains relative simplicity while significantly improving reliability under uplift forces.
Data Source
AI summary
A coupled shaft assembly for a foundation support system includes conical-shaped inner and outer couplers with mating helical ribs and grooves, and an anti-reverse element extending through different shaped openings in the inner and outer couplers that accommodates a limited degree of relative rotation of the couplers and thereafter precludes further relative rotation and an undesirable disengagement of the inner and outer couplers when subjected to reverse rotation.