Prefabricated Wind Turbine Foundation Using Soil Fill
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Solution Overview
Problem
The construction of wind turbine tower foundations is hindered by high costs, logistical challenges, and environmental impact due to the need for large amounts of concrete, which requires on-site pouring and is difficult to inspect and decommission, and the use of concrete increases the carbon footprint and requires extensive labor and resources.
Innovation Solution
A foundation structure using pre-fabricated structural members made of concrete or other materials, assembled in a pit and covered with non-cementitious fill material, such as local soil or aggregate, to stabilize the tower and resist wind forces, allowing for efficient construction and easier decommissioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large amounts of concrete are used for tower foundation, then the foundation can resist compression and tension forces, but the carbon footprint increases and construction costs rise
Solution Approach 1:
The foundation is divided into two functional components: a structural framework made of concrete structural members (to resist forces) and a separate fill material (to provide mass). This segmentation allows each material to be optimized for its specific function, reducing the need for excessive concrete while maintaining both strength and stability.
Solution Approach 2:
Different materials are used for different functions within the foundation: concrete structural members provide localized strength at critical load-bearing points, while the fill material provides distributed mass for stability. This local quality approach ensures concrete is used only where structurally necessary, minimizing overall concrete volume and associated carbon footprint.
2Adaptability or versatility
If on-site pouring of concrete is used, then the foundation can be customized to site conditions, but construction time increases and labor requirements rise
Solution Approach 1:
The concrete structural members are pre-fabricated off-site with standardized dimensions and reinforcement configurations, allowing for customized foundation designs to be prepared in advance. This preliminary action reduces on-site construction time and labor while maintaining adaptability to site conditions through proper design planning.
Solution Approach 2:
The foundation structure is segmented into pre-fabricated concrete members that can be manufactured independently and then assembled on-site. This segmentation enables parallel production of multiple components, accelerating construction while allowing each member to be optimized for specific structural requirements.
3Stability of the object's composition
If concrete is used as fill material to provide mass, then the foundation is stable, but construction costs increase and environmental impact worsens
Solution Approach 1:
The material composition of the fill is changed from concrete to alternative materials such as soil, gravel, or recycled materials. This parameter change maintains the required mass and stability function while eliminating the environmental drawbacks associated with concrete production and disposal, including carbon emissions and concrete waste.
Solution Approach 2:
The fill material is replaced with inexpensive, readily available materials like local soil or gravel that can be easily sourced and disposed of. These materials provide the necessary mass for foundation stability without the high environmental cost and expense of using concrete, and can be removed or replaced more easily if needed.
4Strength
If concrete foundation is used, then the foundation provides structural strength, but inspection and decommissioning become difficult
Solution Approach 1:
The foundation is segmented into a permanent concrete structural framework and a removable fill material component. This segmentation allows the critical structural elements to remain in place while the non-structural fill can be easily removed during decommissioning, significantly simplifying the decommissioning process while maintaining structural integrity during operation.
Solution Approach 2:
The fill material is extracted from the concrete category and treated as a separate, removable component. This extraction allows the foundation to maintain its structural strength through the concrete framework while enabling easy removal of the fill material for inspection or decommissioning purposes, eliminating the difficulty of working with monolithic concrete foundations.
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 construction time, costs, and environmental impact by using locally sourced materials, minimizing labor and site delays, and enabling easier inspection and removal of the foundation, while providing a stable base for wind turbines.
Implementation Method 1
The foundation structure is placed within a pit and covered with a sufficient volume of a particular fill such that a tower coupled to the central shaft is held in position by the fill
Implementation Method 2
Each of the structural members comprises pre-cast concrete, cast-in place concrete, reinforced concrete, pre-stressed concrete, pre-tensioned concrete and post-tensioned concrete, or other materials for resisting the expected forces transferred from the tower
Data Source
Figure 1
Figure 2
AI summary
The foundation structure includes a plurality of structural members. A first end of each structural member is coupled to a central shaft. In appropriate soil conditions, the foundation structure is buried in the soil and the soil itself constrains the mass at the base of the foundation and keeps it from moving. The foundation structure is made of structural components comprises a material, including concrete pre-cast concrete, cast-in place concrete, reinforced concrete, pre-stressed concrete, pre-tensioned concrete and post-tensioned concrete, for resisting the expected forces transferred from the tower.