Pile Base Structure With Open Cells For Soil Plug Formation
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Solution Overview
Problem
Existing vibration piling methods face challenges in achieving high load capacity, efficient driving, and cost-effective installation and decommissioning, particularly in soils with limited depth and under cyclic loading conditions, while also requiring resistance to dynamic and static loads common in offshore structures like wind turbines and wave energy converters.
Innovation Solution
A pile arrangement with a base structure featuring longitudinally open cells, optimized in terms of cell geometry and arrangement, which enhances load capacity by forming solid plugs in the soil, allowing efficient vibration-driven installation and extraction, and is designed to withstand various load types through balanced coring and plugging mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pile arrangement uses a base structure with longitudinally open cells, then the load capacity and stiffness are significantly improved, but the device complexity increases
Solution Approach 1:
The base structure is divided into multiple longitudinally open cells arranged around the stem, creating a segmented configuration that forms solid plugs in the soil. This segmentation increases the surface area for soil interaction and improves load capacity while maintaining a manageable structural complexity through repetitive modular units.
Solution Approach 2:
The base structure employs a porous cell configuration with longitudinal openings that allow soil to penetrate and form solid plugs. This porous design enables the structure to interact with the soil medium effectively, enhancing bearing capacity and stiffness through the plug formation mechanism without requiring a completely solid base.
2Productivity
If the pile arrangement is designed for vibration driving, then the drivability and installation efficiency are improved, but the resistance to dynamic and static loads may be reduced
Solution Approach 1:
The pile arrangement is specifically designed for vibration driving, utilizing oscillating forces to reduce soil resistance during installation. The cellular base structure responds to vibrational inputs by facilitating soil plug formation, which subsequently provides the necessary load resistance. The design optimizes the balance between drivability during vibration and load-bearing capacity after installation.
Solution Approach 2:
The vibration driving process performs a preliminary action by compacting and forming solid soil plugs within the cellular structure before the pile is fully loaded. This preliminary soil compaction and plug formation during installation prepares the base structure to withstand subsequent dynamic and static loads, ensuring both drivability and load resistance are achieved.
3Strength
If the cell geometry is optimized for plug formation, then the load capacity increases, but the manufacturing precision requirements increase
Solution Approach 1:
The cell geometry parameters (such as cell size, shape, and longitudinal opening dimensions) are optimized to facilitate effective soil plug formation. By carefully selecting these geometric parameters, the design achieves high load capacity through improved soil interaction while maintaining manufacturing feasibility. The parameter optimization balances performance requirements with practical manufacturing constraints.
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 pile arrangement achieves significantly higher load capacity, improved stiffness, and cyclic load resistance, with enhanced drivability and cost-effectiveness, enabling reliable anchoring in limited soil depths and efficient handling with smaller equipment.
Implementation Method 1
the pile to be driven is exposed to an oscillating force causing the pile to vibrate, typically in the longitudinal, vertical direction
Implementation Method 2
the oscillating movement of the pile interacts with the surrounding material such that the static frictional forces acting between material and the exposed surfaces of the pile are greatly reduced
Implementation Method 3
allowing the gravitational force acting on the pile and additional bias mass from the vibro-hammer to displace the pile vertically downwards into the ground or seabed
Data Source
Figure 1
Figure 2A~2C
Figure 3A~5C
AI summary
A pile arrangement (1) for vibration driving, which pile arrangement (1) comprises a stem (2) extending in a longitudinal direction between a first end (2a) and a second end (2b), which first end (2a) is arranged to be positioned below the second end (2b) during driving of the pile arrangement (1); and a base structure (3) arranged at or in proximity to the first end (2a). The base structure (3) comprises a plurality of longitudinally open cells (6), which cells are symmetrically arranged around the stem (2) in the cross section of the base structure (3), each cell (6) being defined by a plurality of cell walls (4, 5) extending in the longitudinal direction. Each cell (6) has a height-to-width-ratio calculated as the longitudinal extension of the shortest cell wall (4, 5) defining the cell (6) divided by a significant distance (Sd) of the cell's (6) cross section. The height-to-width-ratio is in the range of 1 - 30, wherein said significant distance (Sd); for cells (6) having a non-triangular cross section, is constituted by the shortest distance between two mutually non-adjacent sides of the cross section, and for cells (806) having a triangular cross section, is constituted by the shortest of the cross-sectional triangle's base and height.