Push Pier Coupling with Hardened Alloy Sections
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Solution Overview
Problem
Conventional coupling methods for helical anchors and push piers are inadequate for applications requiring high load-bearing capacities and lateral forces, as they lead to joint failures and are cumbersome and costly to implement.
Innovation Solution
The use of integrally formed and hardened alloy steel coupling sections, inertia friction welded to the drive and extension shafts, providing a stronger and more reliable connection that can withstand increased torque and lateral forces without the need for external reinforcements or multiple components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional coupling methods (separate coupling inserts, multiple components) are used for helical anchors and push piers, then the device complexity increases and installation becomes cumbersome, but the coupling strength and reliability are insufficient for high load-bearing capacities and lateral forces
Solution Approach 1:
The patent merges the coupling insert and shaft components into a single integrated coupling section that is inertia friction welded directly to the shaft. This eliminates the need for separate coupling inserts, multiple bolts, and external sleeve reinforcements, thereby reducing device complexity while significantly enhancing coupling joint strength and reliability for high load-bearing applications
Solution Approach 2:
The patent employs composite material construction by inertia friction welding dissimilar metals (e.g., steel coupling section to aluminum shaft). This creates a metallurgically bonded composite structure that optimizes the properties of each material - the steel coupling section provides high strength for load-bearing, while the aluminum shaft provides corrosion resistance and weight reduction, achieving superior overall performance
2Reliability
If conventional coupling methods are used, then manufacturing cost increases due to multiple components and assembly steps, but the coupling reliability is insufficient for withstanding increased torque and lateral forces
Solution Approach 1:
The patent extracts the coupling function from separate auxiliary components (coupling inserts, bolts, external sleeves) and integrates it directly into the shaft structure through inertia friction welding. This eliminates the need for multiple discrete parts and complex assembly procedures, reducing manufacturing cost while enhancing coupling joint reliability for withstanding torque and lateral forces
Solution Approach 2:
The patent replaces the mechanical fastening system (bolts, nuts, threaded connections) with an inertia friction welding process that creates a permanent metallurgical bond. This substitution eliminates the need for complex mechanical assembly and disassembly operations, reducing manufacturing cost and improving coupling reliability by creating a monolithic structure resistant to torque and lateral forces
3Strength
If conventional steel materials are used for coupling sections, then the material strength is insufficient for high torque applications, but using harder materials increases manufacturing difficulty
Solution Approach 1:
The patent changes the material parameters by selecting alloys with optimal properties for inertia friction welding - materials with appropriate hardness, thermal conductivity, and melting characteristics. The coupling section and shaft are selected from dissimilar metals or alloys whose physical and mechanical parameters are compatible with the inertia friction welding process, enabling high-strength coupling while maintaining ease of manufacture through controlled parameter selection
4Stability of the object's composition
If multiple separate coupling components are used, then the installation process becomes time-consuming and labor-intensive, but the structural integrity at coupling joints is compromised under lateral forces
Solution Approach 1:
The patent merges multiple separate coupling components into a single integrated coupling section that is pre-welded to the shaft as one unit. This eliminates the need for on-site assembly of multiple parts, significantly reducing installation time and labor requirements while ensuring consistent structural integrity at the coupling joint through controlled factory welding procedures that guarantee performance under lateral forces
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 strength and reliability of the coupling joints, reducing the risk of failure and simplifying the installation process by eliminating the need for separate coupling inserts and external sleeve reinforcements, while maintaining a high level of structural integrity and cost-effectiveness.
Implementation Method 1
The use of integrally formed and hardened alloy steel coupling sections, inertia friction welded to the drive and extension shafts
Data Source
AI summary
A structural support device in the form of a push pier capable of use in high load-bearing capacity applications involving significant lateral load conditions, the push pier having a lead section with a ground penetrating friction collar, and one or more extension members that are machine fabricated with an integrally formed hardened alloy steel coupling section that is adapted to mate with the push pier lead section or another similarly constructed extension shaft. The hardened coupling section is formed of heat-treated and hardened alloy steel which is quenched and tempered to a yield and tensile strength substantially exceeding that of the main tubular shaft section to which it is connected, and inertia friction welded thereto.