Ground Surface Access Cover Reinforcement Beam Design
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Solution Overview
Problem
Conventional ground surface access assemblies, such as manhole covers, face challenges in load-bearing performance due to surface patterns that provide grip but are detrimental under high load testing, and require lightweight construction for cost and handling efficiency while maintaining structural integrity and ease of use.
Innovation Solution
The design incorporates a reinforcement arrangement with a first reinforcement part projecting upwardly and a second reinforcement part projecting downwardly, acting together as a simple beam to enhance load-bearing capacity, and spacer projections for improved stacking stability and reduced material weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional broken surface pattern is provided on the cover to provide grip and skid resistance, then surface friction is improved, but load-bearing capacity deteriorates due to point loading under high load testing
Solution Approach 1:
The surface pattern is designed with locally varied properties: raised areas provide grip and skid resistance where foot traffic occurs, while recessed areas create a more distributed load path underneath. This local differentiation allows the cover to maintain both surface friction and load-bearing capacity by optimizing each zone for its specific function.
2Strength
If the cover is constructed with heavier material to increase load-bearing capacity, then strength is improved, but weight increases leading to higher cost and reduced handling efficiency
Solution Approach 1:
The cover is segmented into a planar base part and a separate reinforcement arrangement that projects upward. This segmentation allows the reinforcement to be strategically positioned only where needed to enhance load-bearing capacity, rather than uniformly thickening the entire cover, thereby adding strength while minimizing weight increase.
Solution Approach 2:
The cover employs a composite structure combining the planar base part with the upward-projecting reinforcement arrangement, creating a composite form that optimizes both strength and weight. This composite design allows the cover to achieve higher load-bearing capacity per unit weight compared to a conventional solid cast design.
3Strength
If the cover design is optimized for load-bearing performance with reinforcement structures, then strength is improved, but manufacturing complexity increases
Solution Approach 1:
The reinforcement arrangement is merged with the planar base part in a single integral casting process. The upward-projecting reinforcement features are formed as part of the same casting operation, eliminating the need for separate manufacturing steps or assembly operations, thus maintaining manufacturing simplicity while achieving enhanced load-bearing capacity.
Data Source
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AI summary
A ground surface access assembly (10) includes a frame (14) defining an access opening (50) and a cover (22), which is mountable to the frame (14) within the opening (50). The cover (22) includes a substantially planar part (24) and a reinforcement arrangement (52). The reinforcement arrangement (52) includes a first reinforcement part (16) projecting upwardly from an upper surface (26) in use of the planar part (24) and a second reinforcement part (30) projecting downwardly from a lower surface (28) in use of the planar part (24).