Offshore Foundation Pile Drop Anchor Installation
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Solution Overview
Problem
Offshore foundation pile installation in the seabed is hindered by noise pollution, inconsistent penetration depth, structural instability, and the need for complex grouting and precise pile placement, which can lead to material fatigue and local structural failures due to buckling, especially with deeper foundations.
Innovation Solution
A method using a drop anchor with attached cables to set anchor points in the seabed, where the anchor penetrates to a predetermined depth under its own kinetic energy, accompanied by a curable casting compound line, allowing for in-situ concrete placement and reinforcement, eliminating the need for ramming and providing flexibility in structure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If steel piles are driven into the seabed using conventional ramming methods, then foundation piles can be installed, but noise pollution damages marine mammals and exceeds permitted limit values
Solution Approach 1:
The patent replaces the conventional mechanical ramming system with a drop-weight installation method. A massive weight is dropped from height to drive the pile into the seabed, substituting the traditional hammering mechanism. This eliminates the continuous noise emissions from conventional pile drivers while achieving the same foundation installation objective.
Solution Approach 2:
The invention uses a single periodic drop action instead of continuous ramming. The pile is installed through one or a few controlled drops of a heavy weight, creating discrete, controlled energy transfers rather than sustained noise-emitting vibrations. This periodic action significantly reduces noise pollution affecting marine mammals.
2Reliability
If steel piles are rammed to considerable depth to reach load-bearing horizon, then pile stability is guaranteed, but penetration depth varies due to seabed strength differences
Solution Approach 1:
The invention changes the installation parameter from force-controlled ramming to energy-controlled dropping. By controlling the drop height and weight mass, the energy delivered to the pile is precisely controlled, allowing consistent penetration depth regardless of seabed variations. The predetermined penetration depth is achieved through calculated drop parameters rather than variable ramming forces.
3Manufacturing precision
If piles are set at specified distance using template prepiling, then precise positioning is achieved, but the method is complex and time-consuming
Solution Approach 1:
The invention extracts and eliminates the complex template system from the pile installation process. Instead of using physical templates to guide pile positioning, the method relies on direct measurement and marking of positions on the seabed or from the structure, simplifying the equipment needed while maintaining positioning accuracy.
4Strength
If larger piles are used for deeper foundations, then load-bearing capacity increases, but undersea currents cause scouring of the seabed
Solution Approach 1:
The invention performs preliminary protection of the seabed around the pile location before the pile is installed. By preparing the seabed surface and potentially installing protective measures in advance, the method prevents scouring that would otherwise occur during and after pile installation, especially for larger piles that create greater disturbance.
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 method reduces noise pollution, ensures consistent penetration depth, enhances structural stability, and simplifies the installation process by eliminating the need for precise template placement and complex grouting, while allowing for greater freedom in positioning offshore structures.
Implementation Method 1
the drop anchor and at least one cable (5) attached to the drop anchor to set at least one anchor point (7) in the seabed (4), to which the cable (5) is attached. The drop anchor is, for example, dimensioned in terms of its mass and in terms of its geometry such that, due to its kinetic energy, it penetrates in free fall to a predetermined depth into the seabed
Implementation Method 2
A curable casting compound, for example concrete that can be cured under water, is then pressed under pressure through this casting compound line into the firing channel, with the cable anchor serving at the same time to reinforce the casting compound column produced in this way in situ
Data Source
Figure 1~3
Figure 4~4c
Figure 5~5b
AI summary
The application relates to a method for producing a foundation pile for offshore structures, the method comprising the following process steps: - providing and arranging a drop anchor at a predetermined height above the seabed, - attaching at least one flexible tension element to the drop anchor, - attaching at least one grouting line to the tension element, - dropping the drop anchor so that it penetrates the seabed, and - introducing a curable grouting compound into the discharge channel created by the drop anchor as it penetrates the seabed.