Offshore Wind Pile Core Positioning for Uplift Stability
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Solution Overview
Problem
Offshore wind power multi-pile foundations face challenges in uplift and compression stability due to the limited bearing capacity of steel pipe piles, especially when the diameter exceeds 1.5 m, and the disturbance of soil during pile sinking reduces friction forces, necessitating larger diameters and lengths to enhance stability.
Innovation Solution
A tool for offshore wind power foundation piles featuring a steel pipe pile with a cutting shoe portion, a pile shoe, and a pile cap, where the pile core is detachably connected to the pile shoe and cap, allowing for positional adjustments using servo linear motion control, enabling radial expansion of cutting shoes for increased foundation area and improved anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the diameter of steel pipe piles is increased to improve bearing capacity, then the uplift and compression stability is improved, but the cost and engineering quantity increase
Solution Approach 1:
The invention transitions from increasing pile diameter (one dimension) to extending pile length and utilizing the inner cavity space (another dimension). The pile core filling the inner cavity transforms the hollow structure into a composite solid-hollow structure, effectively increasing the bearing capacity without increasing the outer diameter, thus reducing steel consumption while maintaining strength.
Solution Approach 2:
The invention creates a composite structure by filling the inner cavity of the steel pipe pile with a pile core material (such as concrete). This composite structure combines the high strength of steel at the outer walls with the compressive strength of the pile core material, achieving enhanced bearing capacity without increasing the steel pipe pile diameter, thereby reducing steel consumption and cost.
2Stability of the object's composition
If the diameter and length of piles are increased to improve compression and uplift stability, then the stability is improved, but the device complexity and cost increase
Solution Approach 1:
The invention segments the pile structure into two distinct parts: the steel pipe pile (outer structure) and the pile core (inner structure). This segmentation allows each component to be optimized independently - the steel pipe pile provides tensile strength and structural framework, while the pile core provides compressive strength. The segmented design achieves improved stability without requiring a single overly complex monolithic structure.
Solution Approach 2:
The invention implements a nested structure where the pile core is placed inside the inner cavity of the steel pipe pile. This nested doll configuration allows the smaller pile core to be contained within the larger steel pipe pile, creating a compact composite structure that improves stability without increasing the overall footprint or requiring additional external structural elements, thereby avoiding increased device complexity.
3Strength
If the diameter of steel pipe piles is increased beyond 1.5 m, then the structural stiffness is improved, but the end bearing capacity cannot play a role and soil friction force is reduced
Solution Approach 1:
The invention applies local quality by concentrating the load-bearing function at specific locations: the steel pipe pile outer walls provide friction resistance along the pile length, while the pile core material at the pile end provides end bearing capacity. This localized functional distribution ensures that both end bearing and friction forces effectively contribute to the overall bearing capacity, even in large-diameter piles where uniform distribution would be ineffective.
Data Source
AI summary
A tool for an offshore wind power foundation pile includes a steel pipe pile, a pile core, a pile cap, and a pile shoe. A cutting shoe portion is arranged at a bottom of the steel pipe pile, and an outer diameter of the pile shoe is larger than an outer diameter of the cutting shoe portion; the pile cap is detachably connected to the top of the steel pipe pile; the pile core is located in the steel pipe pile, the pile core is detachably connected to the pile shoe, and a length of the pile core is larger than or equal to a length of the steel pipe pile; the pile cap is further provided with a pile core accommodating groove and a pile core limiting portion; the pile core limiting portion includes a pile core limiting block and a limiting hole.