Electrode-Integrated Foundation Structure for Low-Noise Installation
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Solution Overview
Problem
The installation of structural foundations, particularly in offshore locations with low hydraulic permeability soils, faces challenges such as high mechanical requirements, noise pollution, and environmental hazards due to pile driving, with existing electro-osmosis systems being costly, hazardous, and prone to failure.
Innovation Solution
A foundation design with integrated first and second electrodes on its lateral surface, allowing for electro-osmosis without separate seabed electrodes, utilizing a circumferential band configuration for efficient water attraction or repulsion to reduce installation resistance and noise, and featuring insulating strips to manage electric fields and fluid ports for electrolyte management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional pile driving is used to install foundations, then the foundation can be driven into the ground, but high impact forces are required which impose significant mechanical requirements on the foundation and generate extreme noise that poses environmental hazards to marine life
Solution Approach 1:
The patent replaces the traditional mechanical pile driving system with an electro-osmosis-based system. Instead of using a pile hammer to apply axial impacts, the invention uses electric fields to attract pore water towards the foundation body, reducing effective stresses and friction between soil grains and the foundation surface. This substitution eliminates the need for high-impact mechanical forces and the associated noise pollution.
Solution Approach 2:
The invention changes the physical-chemical parameters of the soil-foundation interface by applying electro-osmosis. By controlling the electric field parameters (voltage, current density) and resulting water migration, the system alters the effective stress and friction characteristics of the soil, enabling foundation installation with significantly reduced mechanical forces.
2Reliability
If anodes are installed on the seabed adjacent to the pile for electro-osmosis, then water migration can be achieved, but the set-up time and expense of the installation is considerably increased
Solution Approach 1:
The patent merges the foundation body with the electro-osmosis electrode system. The foundation body itself serves as the cathode, and external anodes are integrated directly onto the foundation structure. This consolidation eliminates the need for separate seabed anode installation and reduces the number of discrete components that require separate installation steps.
Solution Approach 2:
The foundation body serves multiple functions simultaneously: it provides structural support and also acts as the cathode for the electro-osmosis system. This multi-functionality reduces the overall component count and simplifies the installation process by eliminating the need for separate electrode installation steps.
3Reliability
If very high voltages are applied to generate sufficient field strength for electro-osmosis, then water migration can be achieved, but the system becomes hazardous and the integrity of electrical insulation over the entire exterior of the pile is crucial to avoid short circuiting
Solution Approach 1:
The patent applies local quality by concentrating the electro-osmosis action at specific locations where anodes are placed on the foundation exterior. Instead of requiring high voltage over the entire foundation surface, the system uses localized electric fields at discrete anode positions, reducing the overall insulation requirements and hazard level.
Solution Approach 2:
The invention introduces insulating materials as intermediaries between the conductive foundation body and the surrounding soil at anode locations. These insulating formations create controlled pathways for the electric field while preventing unwanted current leakage, thereby reducing the overall insulation burden on the foundation coating.
4Strength
If the foundation dimensions are increased for larger offshore structures, then the structure can support larger loads, but current noise mitigation options become insufficient
Solution Approach 1:
The patent replaces mechanical pile driving with electro-osmosis-based installation for large-diameter foundations. This substitution is particularly beneficial for larger structures where traditional noise mitigation methods like bubble curtains become insufficient. The electro-osmosis system enables installation of large foundations without generating the extreme noise levels associated with high-energy pile hammers.
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
Facilitates easier and quieter installation with reduced mechanical stress, lowers installation costs, and enhances soil stability, while minimizing environmental impact, without requiring substantial modifications to existing foundation designs.
Implementation Method 1
research has been made into using electro-osmosis to reduce the pile driving resistance in offshore installations by attracting water in the soil towards the foundation body acting as a cathode. The pore water pressure at the interface between the foundation body and surrounding soil builds up, reducing the effective stresses, and thereby lowering the friction between the soil grains and the foundation surface.
Implementation Method 2
each second electrode extending transversely around the lateral surface and being electrically insulated therefrom by an insulating strip provided between the respective second electrode and the lateral surface
Data Source
AI summary
A foundation (1) for a structure (7) comprising a body (8) having a lateral surface (11) and a distal end (10) for insertion into a soil (2). At least a region of the lateral surface (11) forms a first electrode. One or more second electrodes (9) are provided on the body (8) and are flush with or sit proud of the lateral surface (11). Each second electrode (9) extends transversely around the lateral surface (11) and is electrically insulated therefrom by an insulating strip (12) provided between the respective second electrode and the lateral surface. During installation, a voltage may be applied across the electrodes for inducing an electroosmosis effect to reduce installation resistance.