Single-Pile Friction Wing Foundation for Offshore Lateral Load Capacity
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Solution Overview
Problem
Existing offshore wind power single pile foundations face challenges in achieving sufficient horizontal bearing capacity, especially in sea beds with shallow overburdens and thick silt layers, and are prone to bending, twisting, and buckling under heavy external loads, with complex manufacturing and construction requirements.
Innovation Solution
A single pile-friction wing composite foundation with a tapered transition section and a friction wing connected via a force-conducting pipe, featuring a side wing and ring wing structure that enhances soil interaction and utilizes the 'soil arching effect' to increase horizontal and axial bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single pile foundation is used in sea areas with shallow overburdens and thick silt layers, then the construction is simple and fast, but the horizontal bearing capacity cannot meet the requirements
Solution Approach 1:
The patent combines a single pile foundation with a friction wing structure to form a composite foundation. The friction wing is equipped with side wings and ring wings that increase the interaction area with the soil, utilizing friction and soil resistance to significantly enhance horizontal bearing capacity while maintaining the construction simplicity of the single pile foundation
Solution Approach 2:
The friction wing structure extends horizontally from the single pile with side wings and ring wings, transforming the vertical load-bearing structure into a three-dimensional composite structure that utilizes both vertical and horizontal dimensions to resist lateral loads through increased soil interaction area
2Strength
If rockfill is used in single pile and rockfill composite foundation to improve bearing capacity, then the horizontal bearing capacity increases, but the rockfill cannot penetrate the thick silt layer to reach the bearing stratum
Solution Approach 1:
The patent extracts the rockfill material from the composite foundation structure and replaces it with a friction wing structure that has the advantage of being able to penetrate thick silt layers. The friction wing uses a thorough structure in the axial direction that can be embedded into the bearing stratum through the silt layer, avoiding the penetration problem of rockfill
Solution Approach 2:
The patent changes the physical and mechanical parameters of the foundation structure by using a friction wing with side wings and ring wings that create friction and soil resistance. This changes the load transfer mechanism from direct bearing (rockfill) to friction-based resistance, enabling penetration through thick silt layers while still achieving enhanced horizontal bearing capacity
3Strength
If a single pile and friction ring composite foundation is used to penetrate the silt layer, then the bearing capacity increases, but the construction is difficult due to the need to manufacture, transport and construct the entire structure
Solution Approach 1:
The patent segments the friction ring structure into a friction wing with side wings and ring wings that are radially connected to the outer wall of the force-conducting pipe. This segmentation allows for simplified manufacturing and assembly, reducing construction complexity while maintaining the bearing capacity enhancement through friction and soil resistance
4Adaptability or versatility
If a single pile and wing plate composite foundation is used for deep offshore wind farms, then the structure can handle deeper installations, but the wing structure is prone to bending, twisting, and buckling under heavy external loads
Solution Approach 1:
The patent creates a composite structure combining the single pile foundation with a friction wing that includes side wings and ring wings. This composite structure provides mutual support and reinforcement, enhancing structural stability against bending, twisting, and buckling under heavy external loads in deep offshore conditions while maintaining deep installation capability
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 composite foundation achieves a 50%-10% increase in horizontal bearing capacity, reduces construction complexity, and decreases material consumption while maintaining structural stability and cost-effectiveness.
Implementation Method 1
the friction ring only rests by means of the friction force and the unactive soil resistance between the structural wall and the surrounding soil
Implementation Method 2
the force-conducting pipe of the friction wing located in the bearing stratum is in close contact with the tapered transition section of the single pile, so as to achieve the connection between the single pile and the friction wing
Implementation Method 3
the structure of the side wing and ring wing outside the friction wing makes full use of the soil arching effect to effectively raise the horizontal bearing capacity of the single pile-friction wing composite foundation
Implementation Method 4
the structure of the side wing and ring wing of the friction wing increases the interaction area between the composite foundation and the soil, and raises the horizontal and axial bearing capacity
Data Source
AI summary
An offshore wind power single pile-friction wing composite foundation is provided, which includes a single pile and a friction wing being connected to the single pile through the force-conducting pipe, the tapered transition section of the single pile penetrates deep into the bearing stratum of the seabed, the force-conducting pipe of the friction wing located in the bearing stratum is in close contact with the tapered transition section of the single pile, the side wing of the friction wing is connected to the outer wall of the force-conducting pipe, and the ring wing is arranged inside the included angle of the side wing. There is a thorough structure in the axial direction of the friction wing, having convenience for embedding the bearing stratum of the seabed; the side wing and the ring wing support each other structurally to ensure the structural stability of the friction wing.