Wind Turbine Foundation Pre-stressed Anchor Force Dispersion
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Solution Overview
Problem
The existing pile cap type wind turbine generator foundations face challenges in efficiently connecting foundation piles and pile caps, leading to increased construction workload and costs due to conventional reinforcement methods.
Innovation Solution
The use of pressure-dispersive high strength pre-stressed anchor rods or anchor ropes, with anchor plates and flanges at different depths, disperses the applied force and simplifies the connection between foundation piles and the pile cap, reducing construction workload and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional reinforcement measures such as the reinforcing cage are used to connect the foundation pile and pile cap, then the connection strength is improved, but the construction workload and complexity increase significantly
Solution Approach 1:
The invention extracts the essential function of connection from the complex reinforcing cage system and implements it through simplified pre-stressed anchor rods or anchor ropes. These anchor elements are inserted into the foundation pile and connected to the pile cap, providing the necessary connection strength without requiring extensive reinforcement measures. The anchor rods/ropes are positioned at different depths and angles to achieve effective force dispersion while maintaining structural integrity.
Solution Approach 2:
The invention changes the connection approach from passive reinforcement (cage) to active pre-stressed anchoring. By applying pre-stress to the anchor rods or anchor ropes, the connection achieves enhanced strength and stiffness. The pre-stressing force is transferred through the grout body to the foundation pile, creating a robust connection that simplifies construction while meeting structural requirements.
2Reliability
If the foundation pile is embedded into the concrete pile cap with required embedded depth, then the connection reliability is improved, but the construction workload increases
Solution Approach 1:
The invention implements preliminary action by pre-stressing the anchor rods or anchor ropes before the final connection is completed. The pre-stress is applied to the anchor elements while they are positioned in the foundation pile, ensuring that the connection is already optimized for load-bearing before the pile cap concrete fully sets. This preliminary pre-stressing enhances connection reliability while reducing the need for extensive embedded depth requirements.
3Stability of the object's composition
If multiple anchor rods or anchor ropes are arranged dispersedly at different depths, then the force dispersion performance is improved, but the structural complexity increases
Solution Approach 1:
The invention segments the anchoring system into multiple discrete anchor rods or anchor ropes positioned at different depths and angles within the foundation pile. Each anchor element operates independently to bear and disperse forces along its specific trajectory. This segmentation allows for effective force dispersion throughout the grout body and foundation pile while maintaining a relatively simple overall structure that is easier to construct than a continuous reinforcing cage.
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 enhances the connection performance between foundation piles and pile caps, resulting in a simpler structure, lower construction costs, and reduced workload, while maintaining structural integrity.
Implementation Method 1
the pre-stressing can be transferred to the anchor plate (or anchor head, or flange) when the pre-stressing is applied; the combined arrangement of the anchor rods or anchor ropes and anchor plates (or anchor heads, or flanges) at different depths can effectively disperse the applied force borne by the grouting body
Implementation Method 2
the pre-stressed anchor rods or anchor ropes are enveloped with plastic sleeves to make the anchor rod or anchor rope unable to adhere to the grouting body
Implementation Method 3
the lower end of the anchor rod or anchor rope is fixedly connected to the foundation pile and the grout in the grouting section through the anchor plate, the anchor head, or the flange
Data Source
AI summary
Disclosed is a wind turbine generator foundation with pressure-dispersive pre-stressed anchor rods or anchor ropes. The foundation comprises a pile cap, a plurality of foundation piles arranged circumferentially at the bottom of the pile cap at uniform spacing, and a wind turbine generator tower connected to an upper part of the pile cap.