Utility Enclosure Cover Assembly with Offset Ledge for Load Distribution
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Solution Overview
Problem
Existing cover assemblies for utility enclosures fail to adequately withstand the weight of vehicles in high traffic environments, leading to potential damage from pedestrian and vehicle traffic.
Innovation Solution
A cover assembly comprising a frame and a cover, where the frame is secured to the enclosure with stabilizing brackets embedded in concrete, and the cover is secured to the frame using mounting tabs and apertures, designed to support vertical loads exceeding 40,000 lbs, meeting AASHTO standards, and featuring a cover receiving ledge offset from the overhang to ensure secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing cover assemblies are used for utility enclosures, then the enclosures can be accessed, but the covers cannot withstand the weight of vehicles in high traffic environments
Solution Approach 1:
The cover assembly is divided into separate components: a frame that attaches to the enclosure and a cover that attaches to the frame. This segmentation allows the frame to bear the structural load from vehicle traffic while the cover provides protection and access functionality, resolving the contradiction between cover strength and traffic damage resistance.
Solution Approach 2:
The frame acts as an intermediary between the enclosure and the cover, transferring vehicle traffic loads to the enclosure structure rather than directly to the cover. The frame's mounting tabs and apertures create a mechanical connection that distributes forces, protecting the cover from direct impact of heavy vehicles.
2Stability of the object's composition
If the cover receiving ledge is offset from the overhang, then the cover positioning is secured, but the frame structure becomes more complex
Solution Approach 1:
The cover receiving ledge is pre-positioned offset from the overhang during frame fabrication. This preliminary positioning ensures that when the cover is installed, it automatically seats at the correct location with proper alignment. The offset ledge acts as a mechanical guide that prevents misalignment, providing stable cover positioning without requiring additional adjustment mechanisms or complex assembly procedures.
Data Source
AI summary
Underground utility enclosure cover assemblies are used with direct burial enclosures. The cover assemblies include a frame and a cover. The frame has one or more walls that define a central opening, a cover receiving ledge, an overhang that has a sidewall, and at least one stabilizing member extending from a bottom edge of the sidewall of the overhang. The cover is dimensioned to rest on the cover receiving ledge. The frame and the cover are made of a rigid material that permits the frame and cover to support large vertical loads.