Liquid-Fillable Drop Tank for Offshore Pile Driving
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Solution Overview
Problem
Existing pile driving methods are inefficient and noisy when driving large diameter open-ended and hollow piles, such as those used as monopile foundations for offshore wind turbines, due to the limitations of drop weight mass and energy transfer mechanisms.
Innovation Solution
A pile driving system utilizing a significantly larger drop weight mass, up to 500 tonnes or more, which falls under gravity without additional acceleration, coupled with a liquid fillable drop tank capable of holding large volumes of liquid, to enhance energy transfer and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional drop weight mass is used (around 200 tonnes), then the pile driving system is manageable in terms of equipment size and lift system capacity, but the energy transfer duration is insufficient and noise levels are high when driving large diameter piles
Solution Approach 1:
The patent applies parameter changes by significantly increasing the drop weight mass from conventional 200 tonnes to at least 500 tonnes. This parameter change extends the energy transfer duration during pile driving, allowing for more effective driving of large diameter piles while managing the trade-off through corresponding increases in lift system and vessel capacity
Solution Approach 2:
The patent employs dynamics by making the drop weight mass adjustable and variable. The system can accommodate different drop weight masses depending on the specific pile driving requirements, allowing optimization of energy transfer duration for different pile sizes and soil conditions while maintaining system flexibility
2Power
If additional acceleration mechanisms are used to increase impact energy, then the pile driving effectiveness improves, but the system complexity and noise increase
Solution Approach 1:
The patent extracts the acceleration mechanism from the system entirely. Instead of using complex acceleration devices, the invention relies solely on gravity to accelerate the large mass drop weight, thereby achieving high impact energy while maintaining system simplicity and reducing noise from mechanical acceleration components
Solution Approach 2:
The patent achieves higher impact energy through parameter changes - specifically by increasing the drop weight mass to at least 500 tonnes and optimizing the drop height. This allows the system to achieve sufficient impact energy for large diameter piles without requiring additional acceleration mechanisms, thus maintaining simplicity
3Productivity
If conventional drop weight mass is used, then the equipment size and lift system capacity requirements are lower, but pile driving efficiency is insufficient for large diameter hollow piles
Solution Approach 1:
The patent applies parameter changes by increasing the drop weight mass to at least 500 tonnes, which directly improves pile driving efficiency for large diameter hollow piles. The increased mass provides sufficient energy transfer to overcome the challenges of driving large diameter piles into the seabed, while the corresponding increase in vessel and equipment capacity is managed through proper system scaling
Data Source
AI summary
A pile driving system for driving a pile into the soil comprises a drive head member on a top end of the pile to engage the pile, a lift system between the drive head member and the drop tank for bringing the drop tank into an initial height position relative to the drive head member, and a quick release system for quick release of the lift system so that the drop tank falls down from said initial height position. It further comprises a liquid fillable drop tank, that has a capacity to hold more than 500m3 of a liquid therein and that is vertically mobile above and relative to the drive head member, and an energy transfer assembly configured for transfer of energy from the falling drop tank to the drive head member.