Rectilinear Buoyancy Elements for Marine Dock Sunlight Penetration
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Solution Overview
Problem
Existing floating marine docks face issues with buoyancy element stability, sunlight obstruction, and compliance with environmental regulations, as well as difficulties in assembly and aesthetics, particularly in federally protected waterways.
Innovation Solution
A floating marine dock system utilizing elongate rectilinear buoyancy elements made of extruded polyethylene plastic filled with expanded foam, interconnected with corner braces and connecting bands, allowing for deep water penetration and minimal sunlight obstruction, with customizable configurations and aesthetically appealing decking options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If large surface area buoyancy elements are used to support heavy loads, then the dock can support heavier loads, but the elements rest on or near the water surface and do not penetrate deeply, blocking sunlight from reaching the water surface
Solution Approach 1:
The buoyancy elements are designed with a vertical orientation where the major dimension extends vertically rather than horizontally. This dimensional change allows the buoyancy elements to penetrate deeply into the water column while maintaining the necessary surface area for load support, thereby reducing sunlight obstruction at the water surface.
Solution Approach 2:
The buoyancy elements feature an asymmetric rectangular cross-section with a preferred width-to-height ratio of approximately 2-to-1. This asymmetric design optimizes the penetration depth while maintaining stability and load-bearing capacity, allowing the elements to extend vertically into the water column without excessive horizontal surface area that would block sunlight.
2Device complexity
If foam slabs are used as buoyancy elements, then the dock structure can be simpler, but the foam slabs are difficult to attach to the dock frame and are often detached and lost during storms or destroyed by water dwelling rodents
Solution Approach 1:
The buoyancy elements are constructed from composite materials consisting of extruded polyethylene plastic providing the structural framework and expanded foam filling providing buoyancy. This composite construction integrates the buoyancy function directly into the structural element, eliminating the need for separate foam slabs and their associated attachment problems while maintaining structural simplicity.
Solution Approach 2:
The buoyancy function and structural support function are merged into a single integrated component - the extruded polyethylene plastic element filled with expanded foam. This consolidation eliminates the need for separate attachment mechanisms between foam slabs and the dock frame, thereby improving reliability while keeping the overall structure simple.
3Stability of the object's composition
If drums or plastic floats are used as buoyancy elements, then the dock structure can be more stable, but the drums are difficult to attach and may lose buoyancy if perforated or flooded, while plastic floats are expensive to form and sink if punctured
Solution Approach 1:
The buoyancy elements use a composite construction where extruded polyethylene plastic provides a rust-resistant, puncture-resistant structural framework that maintains stability, while the expanded foam filling provides reliable buoyancy. This composite design eliminates the weaknesses of individual materials - the plastic prevents rust and puncturing, while the foam provides consistent buoyant force.
Solution Approach 2:
The extruded polyethylene plastic material is inherently resistant to corrosion, rust, and puncturing, providing long-lasting buoyancy without the need for protective coatings or frequent maintenance. The material's durability ensures the buoyancy elements will not sink due to perforation or flooding, unlike traditional drums or plastic floats.
4Duration of action of stationary object
If cedar logs are used as buoyancy elements, then the dock structure can be more durable, but the logs are massive in size and weight, expensive, difficult to transport, and subject to boring worms and water logging
Solution Approach 1:
The extruded polyethylene plastic buoyancy elements are lightweight compared to cedar logs, making them easy to transport and install. The material is inherently resistant to biological degradation from boring worms and water logging, providing durable service life without the need for treatment or maintenance of natural wood materials.
Solution Approach 2:
The buoyancy elements are available in customizable lengths and configurations, allowing optimization for specific application requirements. The extruded plastic material can be formed into various shapes and sizes to achieve the necessary buoyancy and structural requirements without the constraints of natural wood dimensions and weights.
5Object-affected harmful factors
If multiple closely spaced buoyancy elements are used to meet sunlight pass-through requirements, then the sunlight obstruction is reduced, but the assembly becomes more complex and difficult to construct
Solution Approach 1:
The dock system is divided into modular buoyancy elements that can be independently assembled. Each element is a self-contained unit with integrated connection features, allowing multiple elements to be easily assembled together to achieve the required sunlight pass-through configuration without excessive assembly complexity.
Solution Approach 2:
The buoyancy elements are designed with universal connection features that allow them to be assembled in various configurations and orientations. The standardized connection interface enables flexible arrangement of multiple elements to meet different sunlight pass-through requirements while simplifying the assembly process through repetition of the same connection mechanism.
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
The system provides stable, customizable, and environmentally compliant floating docks that meet stringent sunlight pass-through requirements, are resistant to damage, and can be easily assembled and maintained, reducing costs and environmental impact.
Implementation Method 1
Interior chambers defined by the buoyancy elements are filled with expanded foam to prevent sinking in the event the buoyancy elements become punctured and to prevent collapsing of the buoyancy elements when compressed by fastening straps.
Implementation Method 2
The physics of flotation require that the weight of the entire dock structure (buoyancy elements, dock frame, deck structure, accessories and any supported load such as people) must be less than the weight of the fluid medium (water) displaced by the buoyancy elements.
Data Source
AI summary
A floating marine dock and connection system there for provides plural elongate rectilinear flotation pontoons having a consistent peripheral configuration with a major dimension and a minor dimension and customizable lengths. Connection apparatus interconnected to the flotation pontoons permits the flotation pontoons to be interconnected end-to-end, in parallel, perpendicular to, and spaced apart from one another. Connection straps extend about the outer periphery of the flotation pontoons and interconnect with flanges, plates and accessories desirable for marine docks. The connection straps support a nailer beam to which decking is fastened. Braces extend between spacedly adjacent flotation pontoons to maintain the spatial relationship therebetween and to support service conduits.