Dual Screw Anchor Driver for A-Frame Solar Tracker Foundations
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Solution Overview
Problem
The high cost of solar energy infrastructure, particularly foundations for large-scale solar arrays, remains a significant impediment to widespread solar adoption, with conventional monopile foundations being inefficient and costly due to their design, which requires oversized structures to withstand lateral loads from wind forces.
Innovation Solution
The use of A-frame truss foundations with screw anchors, which convert lateral loads into axial forces, allowing for a more efficient distribution of loads and potentially reducing the amount of steel needed and the depth of foundation installation, along with specialized machines and methods for efficiently installing these foundations across various soil conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional monopile foundations are used to support solar trackers, then the foundations can withstand lateral loads from wind forces, but the foundations require oversized structures and deep installation increasing material and labor costs
Solution Approach 1:
The monopile foundation is divided into multiple discrete screw anchors (typically three) arranged in a triangular pattern. Each anchor independently resists lateral loads through soil friction and end-bearing, collectively providing the required strength while using less total steel than a single oversized monopile.
Solution Approach 2:
The screw anchors are driven into the ground in a nested configuration where the anchors work together as a unified foundation system. The anchors are positioned to overlap their influence zones in the soil, creating a composite foundation structure that efficiently distributes and resists lateral loads.
2Strength
If conventional monopile foundations are used to support solar trackers, then the foundations can withstand lateral loads from wind forces, but the installation depth increases leading to higher construction costs
Solution Approach 1:
The deep single monopile is segmented into multiple shallower screw anchors distributed across a triangular footprint. Each anchor is driven to a practical depth where it achieves sufficient soil resistance, eliminating the need for one extremely deep installation while maintaining overall foundation strength.
Solution Approach 2:
The foundation system transitions from a single vertical dimension (deep monopile) to a two-dimensional triangular arrangement of anchors. This spatial distribution allows the anchors to collectively resist lateral loads through their combined soil interaction, reducing the required depth of each individual anchor.
3Quantity of substance
If A-frame truss foundations with screw anchors are used instead of monopiles, then material and labor costs are reduced, but specialized installation equipment and methods are required
Solution Approach 1:
The A-frame truss structure integrates the screw anchors with the tracker mounting system into a unified assembly. The anchors serve dual purposes as both foundation elements and structural support for the truss, eliminating the need for separate monopile installation equipment and simplifying the overall installation process.
Solution Approach 2:
The screw anchors are designed to be self-installing through rotational driving, eliminating the need for complex heavy-duty monopile driving equipment. The threaded geometry allows the anchors to engage the soil progressively during rotation, enabling installation with relatively simple torque-applying machinery.
4Length of stationary object
If A-frame truss foundations with screw anchors are used, then shallower installation is achieved reducing construction costs, but the foundation configuration becomes more complex
Solution Approach 1:
The foundation is segmented into discrete screw anchors arranged in a simple triangular pattern, making the configuration easier to understand and install than a complex continuous monopile structure. The modular nature of the anchors allows for straightforward positioning and installation at shallower depths.
Solution Approach 2:
The A-frame truss structure serves as an intermediary element that connects the screw anchors to the solar tracker mounting system. This truss mediator simplifies the overall configuration by providing a clear structural path from the anchors to the tracker, making the foundation system more intuitive than direct monopile-to-tracker connections.
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 approach reduces the material and labor costs associated with foundation construction, making solar energy more competitive by enabling shallower and less costly foundation installations while maintaining structural integrity under lateral loads.
Implementation Method 1
The screw anchor is rotated by a rotary driver about a longitudinal axis of the screw anchor to a desired depth in the supporting ground
Implementation Method 2
screw anchors, which convert lateral loads into axial forces
Data Source
AI summary
A machine for driving a pair of screw anchors at substantially the same time. An attachment supports a pair of independent drive assemblies. Each assembly consists of a rotary driver and tool driver that moves along respective driving arms to independently drive a pair of screw anchors into supporting ground at different angles. Each assembly may move with respect to the machine independently to drive anchors into the ground in overlapping time, or both may rotate at once to drive anchors into the ground sequentially.