Reinforced Handhole Box Wall Structure Against Underground Deflection
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Solution Overview
Problem
Existing handhole boxes lack sufficient structural reinforcement and stability, particularly in underground installations, leading to potential deflection and displacement.
Innovation Solution
A multi-layer construction with an internal reinforcing grid disposed between outer and inner walls, forming a structural wall that includes a tapered configuration to enhance stability and prevent deflection, combined with a cap that securely closes the top opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer wall construction is used, then the device complexity is reduced, but the structural strength and stability are insufficient
Solution Approach 1:
The patent applies composite material construction by combining an outer wall, inner wall, and reinforcing grid into a multi-layer structural system. The outer wall and inner wall are made of durable materials resistant to environmental degradation, while the reinforcing grid provides additional structural support. This composite structure resolves the contradiction by achieving high structural strength through material composition rather than increasing overall device complexity.
Solution Approach 2:
The patent implements nesting by placing the reinforcing grid between the outer wall and inner wall, creating a nested multi-layer configuration. The grid is positioned within the cavity formed by the two walls, with its outer surface spaced from the inner wall. This nested arrangement provides enhanced structural strength while maintaining a compact design, effectively resolving the contradiction between strength and complexity.
2Stability of the object's composition
If reinforcement is added to prevent deflection, then the structural stability is improved, but the weight of the structure increases
Solution Approach 1:
The patent applies local quality by strategically positioning the reinforcing grid at specific locations within the wall structure. The grid is placed between the outer and inner walls with its outer surface spaced from the inner wall, providing reinforcement where most needed for structural stability. This localized reinforcement approach achieves high stability without uniformly increasing the weight of the entire structure.
Solution Approach 2:
The multi-layer composite construction distributes weight across different functional layers. The reinforcing grid, made of high-strength material, provides structural stability with minimal weight addition. The outer and inner walls provide environmental protection and structural form. This composite approach resolves the contradiction by achieving high stability through material selection and configuration rather than uniform thickening that would increase weight.
3Strength
If a multi-layer construction with reinforcing grid is used, then the structural strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the wall structure into distinct modular components: an outer wall, an inner wall, and a reinforcing grid. Each component can be manufactured separately using optimized processes for that specific element, then assembled together. This segmentation improves structural strength through proper component design while facilitating easier manufacturing and quality control compared to creating a monolithic complex structure.
Solution Approach 2:
The nested configuration of the reinforcing grid between the outer and inner walls allows for efficient assembly. The grid can be positioned within the cavity during the manufacturing process, and the spaced arrangement from the inner wall provides clearance for attachment and quality inspection. This nested design achieves high structural strength while maintaining manufacturing feasibility through logical component arrangement and assembly sequencing.
Data Source
AI summary
An in-ground utility enclosure includes an outer wall. An inner wall is coupled to the outer wall to define a cavity therebetween. The outer wall and the inner wall cooperate to define a bottom opening and a seat that defines a top opening. An internal grid is disposed within the cavity and extends between the outer wall and the inner wall. A cap is selectively disposed on the seat and selectively occupies the top opening.