Variable Mass Vibration Device for Pile Driving
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Solution Overview
Problem
Vibratory piling methods face challenges such as noise pollution, reduced lateral load-bearing capacity, and high setup and equipment movement costs, especially in offshore foundations, due to difficulties in adapting vibration frequencies and maintaining consistent penetration during interruptions.
Innovation Solution
A method involving a vibration device attached to the piling that introduces high-frequency vibrations into the subsoil, with varying mass of the device or piling to adapt penetration speed and overcome soil resistance, allowing for improved discontinuous vibratory ramming and increased lateral load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vibration device is temporarily deactivated during piling, then operation can be interrupted, but when reactivated the vibration behavior changes due to partial clamping by subsoil making further sinking more difficult
Solution Approach 1:
The patent applies dynamics by making the mass of the vibration device variable rather than fixed. The mass can be adjusted during the piling process, specifically increased when the vibration device is reactivated after interruption, to compensate for the increased resistance caused by partial clamping of the piling by the subsoil. This dynamic mass adjustment allows the system to adapt to changing operating conditions and maintain effective penetration capability.
2Reliability
If both vibration device and impact ram are provided on construction site, then optimal foundation can be achieved, but set-up effort and equipment movement costs are disproportionately high
Solution Approach 1:
The patent applies universality by designing the vibration device to perform multiple functions. The single vibration device can operate in different modes: continuous vibration for normal piling, and with increased mass for overcoming partial clamping after interruptions. This multi-functionality eliminates the need for separate impact ram equipment while maintaining the ability to achieve optimal foundation conditions, thereby reducing equipment complexity and setup effort.
3Speed
If mass of vibration device is increased, then penetration speed into subsoil is improved, but lateral load-bearing capacity may be reduced
Solution Approach 1:
The patent applies dynamics by making the mass variable rather than constantly high. The mass is increased only when needed for penetration (such as after vibration interruptions), and can be reduced or returned to normal levels when the piling reaches the desired depth or when continuous vibration is resumed. This dynamic adjustment allows achieving sufficient penetration speed while minimizing the negative impact on lateral load-bearing capacity.
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
Enables efficient and environmentally friendly piling by varying the vibration conditions to maintain consistent penetration and increase load-bearing capacity, reducing noise and equipment costs, particularly suitable for offshore applications.
Implementation Method 1
high-frequency vibrations being introduced via the piling into the subsoil in front of a profile foot of the piling by means of a vibration device attached to the piling
Implementation Method 2
the subsoil in front of the profile foot liquefies
Data Source
Figure 1
AI summary
The invention relates to a method for vibratory driving of pile material (1) into a subsoil (2) by introducing high-frequency vibrations, which are generated by means of a vibration device (10) attached to the pile material (1), through the pile material (1) into the subsoil (2) in front of a profile base (3) of the pile material (1) with at least partial liquefaction of the subsoil (2) in front of the profile base (3), wherein the method is characterized in that a mass of the vibration device (10) and/or of the pile material (1) is varied during the insertion of the pile material (1) into the subsoil (2).