Grating System Bottom-Mounted Crossbar Fastening
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Solution Overview
Problem
Existing grating systems for vehicle and pedestrian traffic face issues with aesthetic appeal due to welds on the upper surface and locking configurations that become loose over time without concrete or welding, especially under regular traffic.
Innovation Solution
A grating system with longitudinally spaced deep bars, crossbars, and filler bars that are secured using welds at intersections, allowing for a see-through design without notches that can loosen, featuring a configuration where crossbars and deep bars intersect and are slidably inserted to secure the structure without relying on concrete or extensive welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welds are used on the upper surface to secure crossbars to deep bars, then structural strength is improved, but aesthetic appeal deteriorates
Solution Approach 1:
The patent removes welds from the upper surface by repositioning the crossbar attachment mechanism to the bottom surface. Crossbars are secured to deep bars through slots and fasteners at the bottom, eliminating visible welds on the upper surface while maintaining structural strength through proper mechanical connection.
Solution Approach 2:
The attachment mechanism is moved from the upper surface (2D plane) to the bottom surface (different spatial dimension), allowing welds or fasteners to be hidden from the aesthetic view while maintaining structural integrity through the same connection method.
2Ease of manufacture
If notches are used to interlock crossbars and deep bars, then ease of assembly is improved, but reliability deteriorates as connections become loose over time
Solution Approach 1:
The patent uses slots with fasteners that allow for dynamic adjustment and secure tightening, providing a connection that can be easily assembled yet maintains high reliability. The fastener system enables proper clamping force to prevent loosening under traffic loads while keeping the assembly process simple.
Solution Approach 2:
The patent introduces slots as an intermediary element between crossbars and deep bars. These slots provide a controlled interface that accommodates thermal expansion and contraction while maintaining secure connection through fasteners, preventing the loosening issue associated with rigid notched connections.
3Reliability
If concrete is used to fill and secure the grating structure, then reliability is improved, but device complexity deteriorates
Solution Approach 1:
The patent removes the concrete filling requirement by designing a self-contained metal framework with bottom-mounted fasteners that secure all components mechanically. This eliminates the need for concrete while maintaining structural stability through the engineered connection system between deep bars, crossbars, and filler bars.
Solution Approach 2:
The patent replaces the chemical bonding mechanism of concrete with a mechanical fastening system using slots and fasteners at the bottom of the structure. This mechanical substitution provides equivalent or superior reliability while reducing complexity by eliminating the concrete pouring and curing process.
Data Source
AI summary
A grating system typically includes longitudinal deep bars, axial crossbars, longitudinal filler bars seated on the crossbars between the deep bars and axial joining bars which join the deep bars and filler bars to one another. The crossbars are inserted lengthwise through slots formed in the deep bars. The joining bars are inserted lengthwise into holes formed in the deep bars and filler bars. The joining bars are typically above and aligned with the crossbars. The upper surfaces of the crossbars and filler bars are substantially flush with one another to form most of the upper surface of the grating system on which vehicular and pedestrian traffic typically travel.