Helical Pile Coupler Torque Transfer Design
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Solution Overview
Problem
Conventional helical piles are prone to deformation or failure under excessive torque loading, and their fasteners are also susceptible to failure when securing tube ends together.
Innovation Solution
A helical pile coupler assembly with male and female couplers that define a projection and socket, respectively, allowing for torque transfer through a resilient joint with a projection profile featuring three radial lobes, which are shiftable along the coupler axis to engage and disengage, and secured with threaded fasteners to distribute torque effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional tube ends are used with pin-shaped fasteners to connect helical pile sections, then the pile can be assembled to increase length, but the tube ends are prone to deformation or failure when subjected to excessive torque loading
Solution Approach 1:
The coupler is divided into separate male and female portions that connect via a projection-socket interface. This segmentation allows each component to be optimized for its specific function while distributing the torque loads across multiple contact points (three radial lobes) rather than concentrating stress at a single pin fastener location.
Solution Approach 2:
The projection profile features three radial lobes arranged asymmetrically around the coupler axis, creating an asymmetric engagement pattern with the socket. This asymmetric geometry provides superior torque resistance compared to symmetric designs by distributing stresses more effectively across the engagement interface, preventing deformation under excessive torque loading.
2Ease of manufacture
If pin-shaped fasteners are used to secure tube ends together, then the connection can be simple and easy to assemble, but the fasteners are susceptible to deformation or failure under excessive torque
Solution Approach 1:
The coupler assembly allows for axial movement (shifting) of the male and female couplers relative to each other along the coupler axis while maintaining rotational engagement. This dynamic capability enables the connection to accommodate assembly variations and operational loads, enhancing reliability without complicating the assembly process.
Solution Approach 2:
The connection mechanism transitions from a single-point pin fastener to a multi-point projection-socket interface that engages in multiple dimensions (radial lobes providing circumferential engagement while allowing axial shifting). This dimensional expansion of the engagement interface significantly improves torque resistance while maintaining ease of assembly through the same basic insertion motion.
Data Source
AI summary
A helical pile coupler assembly is operable to be drivingly attached to a helical pile section and is rotatable with the helical pile section about a coupler axis. The coupler assembly is operable to transfer torque supplied by a rotating drive to the helical pile section as the helical pile section is driven through the ground. The coupler assembly includes male and female couplers that define a projection and a socket, respectively. The male and female couplers are shiftable relative to each other along the coupler axis into and out of a mated condition where the projection and socket are mated so that the couplers drivingly engage each other and are configured to transfer torque therebetween. The socket is shaped to removably receive the projection in the mated condition. The projection presents a projection surface that extends along the coupler axis and defines a projection profile with only three radial lobes, with each of the lobes extending radially outwardly relative to the axis in corresponding radial directions.