Helical Pier Foundation for Utility Structures
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Solution Overview
Problem
Existing methods for installing electrical utility structures, such as direct embedment and concrete caissons with anchor bolts, require significant time, labor, and site disturbance, leading to high costs and potential damage to construction sites, and are inadequate for meeting strict timelines with minimal site impact.
Innovation Solution
A foundation system utilizing multiple helical piers driven into the ground and indirectly attached to a structure base via arm members, which can be connected using pin or bolted connections, with options for stiffening support through elongated plate arms, polygonal arms, or doubler assemblies with stiffening rings, to minimize site disruption and installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct embedment or concrete caissons with anchor bolts are used to install electrical utility structures, then the structures can be securely supported, but significant time, labor, and site disturbance are required, leading to high costs
Solution Approach 1:
The patent replaces traditional mechanical foundation systems (concrete caissons with anchor bolts, requiring curing time) with helical piers that can be installed immediately upon insertion. The helical piers provide structural support through their threaded design that engages with the ground, eliminating the need for concrete curing and significantly reducing installation time while maintaining reliability.
Solution Approach 2:
The helical piers are pre-manufactured with threaded sections and connection components, allowing them to be delivered ready-for-installation. The arm members and doubler assemblies are also pre-fabricated, enabling rapid assembly without requiring on-site concrete pouring or curing time, thus addressing the time loss issue while maintaining structural reliability.
2Reliability
If concrete caissons with anchor bolts are used, then structures can be securely installed, but time must be spent waiting for concrete to cure and set up
Solution Approach 1:
The patent eliminates the concrete curing process by substituting it with helical piers that provide immediate structural support upon installation. The threaded helical piers engage with the ground through mechanical interlocking, removing the need for waiting periods and enabling immediate use of the structure while maintaining secure support.
3Reliability
If heavy equipment is used for direct embedment and anchor bolt foundations, then structures can be installed, but site disturbance and displacement of ground material occur
Solution Approach 1:
The patent replaces heavy equipment-based installation methods with a system that uses smaller, more precise equipment for helical pier installation. The helical piers are inserted into the ground using mechanical augers or similar devices that cause minimal ground disturbance, avoiding the large-scale earth displacement associated with traditional concrete caisson methods.
Solution Approach 2:
The foundation system is divided into separate modular components (helical piers, arm members, doubler assemblies, plate caps) that can be installed independently and assembled on-site. This segmentation allows for minimal site disturbance during installation, as each component can be placed and secured without requiring extensive ground preparation or heavy equipment operation.
4Reliability
If traditional foundation methods are used, then structures can be supported, but significant labor and installation costs are required
Solution Approach 1:
The foundation system is divided into separate modular components (helical piers, arm members, doubler assemblies, plate caps) that can be manufactured independently and assembled on-site. This segmentation allows for reduced labor requirements and lower installation costs compared to traditional methods, while maintaining structural reliability through standardized connection details and pre-fabricated components.
Solution Approach 2:
The patent replaces labor-intensive concrete pouring and curing processes with mechanical helical pier installation systems that can be rapidly assembled. The standardized helical pier design with integrated connection features reduces the need for specialized labor and equipment, thereby reducing installation costs while maintaining structural support reliability.
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
This solution reduces site impact, labor, and installation costs while allowing for rapid installation of electrical utility structures, accommodating varying forces and timelines with minimal site disturbance.
Implementation Method 1
multiple helical piers which are driven into the ground
Implementation Method 2
The arm members attach to the helical piers at their distal ends by a pin connection
Implementation Method 3
The arm members attach to the helical piers at their distal ends by a pin connection or a bolted connection
Implementation Method 4
doubler assemblies which are welded to the outer walls at the base of the structure
Data Source
AI summary
A foundation system for electrical utility structures is provided that minimizes impact on the chosen construction site, minimizes labor and minimizes associated installation costs. The foundation system comprises a structure to be supported at its base which has a plurality of arm members secured to the base and a plurality of helical piers or micropiles which are inserted into the ground and distally attached to the base of the structure by attaching to the arm members.