Helical Pile Coupling Assembly Torque Transfer
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Solution Overview
Problem
Helical pile systems face limitations in transferring torque due to fasteners, alignment difficulties of large and unwieldy members with circular cross sections, reduction in inner diameter, and increased soil disturbance during installation, which restricts the depth of pile driving.
Innovation Solution
A coupling assembly with a coupling member featuring a hollow protrusion and rib structure that allows for quick alignment and connection of members without reducing the inner diameter, using fasteners that prevent withdrawal and transfer torque through the protrusions and ribs rather than fastener holes, minimizing soil disturbance with a low-profile design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fasteners are used to connect helical pile members, then the members can be secured together, but the torque transfer capability is limited
Solution Approach 1:
The coupling assembly is divided into distinct functional components: a coupling member with multiple protrusions for torque transfer, and a separate fastener for securing the connection. This segmentation allows each component to be optimized for its specific function - the protrusions handle torque transfer while the fastener provides structural security.
Solution Approach 2:
The protrusions act as intermediary elements between the first and second helical pile members. Instead of direct fastener-to-member contact for torque transfer, the protrusions mediate the torque transfer process, providing enhanced capability while the fastener secures the overall assembly.
2Reliability
If fastener holes are drilled through helical pile members, then fasteners can be inserted to secure members, but the inner diameter is reduced
Solution Approach 1:
The fastener holes are extracted from the path of the inner diameter. The fastener openings are positioned in the coupling member wall rather than through the central passage, separating the fastening function from the inner diameter space and allowing both functions to coexist without interference.
Solution Approach 2:
The fastener openings are positioned in the radial dimension of the coupling member wall, away from the axial central passage. This dimensional separation allows the fasteners to be inserted without reducing the inner diameter, as the fastening operation occurs in a different spatial dimension than the component passage.
3Ease of operation
If conventional coupling methods are used, then members can be connected, but alignment of fastener holes is difficult
Solution Approach 1:
The coupling member features asymmetric protrusions with specific geometries that correspond to matching features on the helical pile members. This asymmetric design provides natural alignment cues, allowing the components to self-align during insertion without requiring precise manual alignment of fastener holes.
Solution Approach 2:
The protrusions are pre-positioned on the coupling member in specific orientations and locations. This preliminary positioning of the torque transfer elements provides built-in alignment guidance, so that when the coupling member is inserted, the alignment is automatically established before the fastening operation occurs.
4Strength
If bulky coupling structures are used, then strong connections can be made, but soil disturbance increases during installation
Solution Approach 1:
The coupling assembly is designed with a compact, streamlined profile that minimizes its cross-sectional area. This dynamic optimization of the geometry allows the coupling to be installed in the confined space between helical piles without excessive soil displacement, while still providing robust connection strength through the protrusion-fastener mechanism.
Solution Approach 2:
The fastener is nested within the coupling member structure, with the fastener opening positioned in the coupling wall rather than extending outward. This nesting arrangement maintains a low external profile of the coupling assembly, minimizing soil disturbance during installation while preserving the internal fastening mechanism for strong connections.
Data Source
AI summary
A coupling assembly for connecting first and second members of a helical pile system. A coupling member has a first opening at a first end and a second opening at a second end. A hollow protrusion extends outwardly from and axially along the outer surface of the coupling member. A fastener opening is disposed in the coupling member. A first member is fixedly receivable by the first opening of the coupling member. A second member has a rib disposed on an outer surface. The rib is receivable by the protrusion when the second member is received by the second opening of the coupling member. A fastener is receivable in the fastener opening. The fastener prevents withdrawal of the second member after being inserted in the coupling member.