Helical Anchor Hardened Coupling Inertia Friction Welding
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Solution Overview
Problem
Conventional coupling methods for helical anchors fail to withstand increased torque and load-bearing capacities, leading to coupling failures and are cumbersome and labor-intensive.
Innovation Solution
The helical anchor features an integrally formed and hardened alloy steel coupling section, heat-treated to a yield strength of 135,000 psi, fused to the drive shaft using inertia friction welding, eliminating the need for separate coupling inserts and reducing the number of parts required for securement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional coupling methods are used for helical anchors, then the structure can be assembled, but the coupling fails under increased torque and load-bearing capacities
Solution Approach 1:
The coupling section is integrally formed with the drive shaft as a single monolithic component, eliminating the weakness of separate coupled parts. This merging of the coupling section and drive shaft into one integral structure allows the entire assembly to withstand high torque and load-bearing capacities without failure at joint interfaces.
Solution Approach 2:
The coupling section is constructed from alloy steel with increased carbon composition (0.35% or greater) and heat-treated to achieve superior mechanical properties (yield strength of 135,000 psi or greater). This parameter change in material composition and heat treatment transforms the coupling section into a high-strength component capable of withstanding extreme torque conditions.
2Ease of manufacture
If separate coupling inserts and multiple components are used, then assembly is possible, but the process becomes cumbersome and labor-intensive
Solution Approach 1:
By integrating the coupling section directly into the drive shaft as a single component, the invention eliminates the need for separate coupling inserts, bolts, and multiple assembly steps. This reduces the total number of parts and simplifies both manufacturing and field assembly operations.
Solution Approach 2:
While the coupling section is integral to the drive shaft, the helical anchor system remains segmented into modular sections (starter section, extension sections) that can be coupled together. This allows the anchor to be adapted to various depths and load requirements while maintaining simple integral couplings at each joint.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly enhances the anchor's strength, preventing tearing and failure under high torque conditions, simplifies the installation process, and reduces costs by eliminating the need for multiple components and labor-intensive alignment.
Implementation Method 1
The coupling section is fused to the drive shaft using inertia friction welding
Implementation Method 2
heat-treated to a yield strength of 135,000 psi
Data Source
AI summary
A helical anchor capable of use in high load-bearing capacity applications involving extreme drive torque conditions, the anchor having a main drive shaft machine fabricated with an integrally formed hardened alloy steel coupling section that is adapted to mate with a similarly hardened and integrally formed corresponding coupling section of an extension shaft. The coupling sections are formed of seamless high-carbon heat-treated alloy steel which is quenched and tempered to a yield and tensile strength approximating 135,000 psi, and inertia friction welded to the hot-finished seamless alloy steel tubing utilized in the formation of the remainder of the drive and extension shafts.