Vibrating Foundations with Gas Injection and Mass Control
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Solution Overview
Problem
Vibratory pile driving for offshore structures faces challenges such as reduced axial and lateral load-bearing capacity, interruption of the vibration process, and difficulty in completing the installation due to soil density variations and equipment limitations, leading to potential building ground risks and noise issues.
Innovation Solution
A method and apparatus that control and regulate the vibrational driving-in of foundations by varying the liquefaction zone around the pile through adjustments in the size of the liquefaction zone, effective mass, and hydrostatic gradient, using air and gas injection and fluid pumping to enhance penetration and reduce friction, allowing continuous installation without interrupting the vibration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vibratory pile driving is used to install foundations, then installation speed is improved, but load-bearing capacity is reduced
Solution Approach 1:
The patent combines vibratory driving with impact driving in a hybrid installation method. The vibration device operates continuously to maintain soil liquefaction and reduce friction, while the impact hammer provides additional axial force for the final penetration stages, achieving both high installation speed and adequate load-bearing capacity
Solution Approach 2:
The patent dynamically adjusts the installation method based on penetration depth and soil conditions. Vibration is applied throughout the entire installation process, with impact forces applied selectively during specific depth ranges, creating a dynamic, adaptive installation approach that optimizes both speed and capacity
2Ease of repair
If the vibration process is interrupted for adjustments or repairs, then equipment maintenance is enabled, but penetration becomes difficult or impossible due to soil reconsolidation
Solution Approach 1:
The patent maintains continuous vibration throughout the entire installation process, including during any equipment adjustments or repairs. The vibration device remains active to prevent soil reconsolidation, ensuring that the liquefied state is maintained and penetration can resume immediately without difficulty
Solution Approach 2:
The patent prepares for potential interruptions by maintaining a reserve of vibrational energy and soil liquefaction ahead of time. The continuous vibration creates a buffer zone of liquefied soil that protects against the adverse effects of any interruptions, allowing maintenance without losing penetration capability
3Strength
If impact hammer is used for the last few metres, then load-bearing capacity is improved, but device complexity increases
Solution Approach 1:
The patent makes the vibration device multi-functional by enabling it to perform both the primary vibratory driving function and serve as a continuous soil-liquefying mechanism during impact driving. This universal approach allows one device to fulfill multiple roles, reducing the need for separate specialized equipment
4Ease of operation
If vibration frequency is varied to control penetration rate, then penetration control is improved, but energy consumption increases
Solution Approach 1:
The patent optimizes vibration frequency parameters to achieve effective soil liquefaction at moderate frequencies, balancing penetration control capability with energy efficiency. By selecting optimal frequency ranges that maximize liquefaction effect while minimizing power consumption, the system achieves good control without excessive energy use
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
This approach improves the penetrative efficiency and load-bearing capacity of piles, reduces noise during offshore installations, and enables uninterrupted pile driving by controlling the liquefaction zone and effective mass, thereby overcoming the limitations of traditional vibratory pile driving methods.
Implementation Method 1
initiating vibrations generated by means of a vibrating device attached to the foundation, the vibrations causing liquefaction of the building ground so that the foundation penetrates the building ground
Implementation Method 2
means for injecting air and/or gases (3) at the foundation (1), wherein the size of the liquefaction zone (2) is made possible by blowing in air
Implementation Method 3
means for extracting liquid (10) from the interior (4) of the foundation (1)
Data Source
AI summary
The subject matter relates to a method and an apparatus for vibrating-in a foundation into a building ground by initiating vibrations generated by means of a vibrating device attached to the foundation, the vibrations causing liquefaction of the building ground so that the foundation penetrates the building ground.