Posted Structure Support With Multiaxial Plank Locking
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Solution Overview
Problem
Existing supports for posted structures on planked structures, such as piers and boardwalks, provide limited resistance to transverse forces, particularly crosswinds, due to single or dual-axis fixation points.
Innovation Solution
A support apparatus with a rectangular base plate featuring multiple apertures and a central cylinder, allowing for multiaxial fixation through locking bolts and nuts, providing resistance in multiple cardinal directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single locking member is used to fix the support to the planked structure, then the device complexity is reduced, but the resistance to transverse forces such as crosswinds is limited
Solution Approach 1:
The single locking member is segmented into multiple locking members (first locking member and second locking member) that can be independently positioned and locked. Each locking member engages with the planked structure at different locations, distributing the transverse forces across multiple attachment points rather than concentrating them at a single point, thereby increasing overall resistance to crosswind loads.
Solution Approach 2:
The locking members are arranged along different axes (first axis and second axis) that are not collinear. This multi-dimensional arrangement allows the support to resist forces from multiple directions simultaneously. The first locking member resists forces along the first axis while the second locking member resists forces along the second axis, providing comprehensive multiaxial resistance to transverse loads.
2Strength
If two locking members along a single axis are used, then the resistance to forces along that axis is improved, but the resistance to forces transverse to the axis remains limited
Solution Approach 1:
The first and second locking members are positioned asymmetrically relative to each other along different axes that intersect at the support. This asymmetric, multi-axial arrangement ensures that forces applied from any direction (including transverse directions perpendicular to either axis) create moments that must be resisted by both locking members working together, providing comprehensive resistance in all directions.
Solution Approach 2:
The locking system transitions from a single-axis arrangement to a multi-axis arrangement where the first locking member operates along a first axis and the second locking member operates along a second axis that is transverse to the first axis. This dimensional expansion allows the system to resist forces in multiple directions simultaneously, transforming a unidirectional resistance system into a multiaxial resistance system.
3Strength
If multiple locking members along multiple axes are used, then the resistance to transverse forces is improved, but the device complexity increases
Solution Approach 1:
Each locking member is designed as a multi-functional component that can engage with the planked structure at different orientations. The locking members incorporate features such as locking arms, engagement surfaces, and adjustment mechanisms that allow them to function effectively whether positioned along the first axis or the second axis. This universality reduces the need for specialized components for different directional requirements, managing complexity while achieving multiaxial resistance.
Data Source
AI summary
An apparatus for supporting a posted structure is provided which is fixable to a planked structure. The apparatus includes a base plate having: top and bottom faces; first and second intersecting axes which separate the top face of the base plate into first, second, third, and fourth quadrants; and first, second, third, and fourth apertures formed in the four quadrants, respectively. The apparatus further includes an upstanding cylinder extending from the top face of the base plate at the intersection of the first and second axes; and, first, second, third, and fourth locking bolts each having: an elongated shank; and, an elongated locking member fixed transversely to the shank, the locking member being sized to pass through spacing between a pair of adjacent planks of the planked structure. Locking nuts are provided for threadedly mounting to threads of each the first, second, third, and fourth locking bolts.