Rib-Reinforced Utility Access Box for High Load, Low Weight
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Solution Overview
Problem
Existing utility access boxes for infrastructure components often struggle with structural stability and weight, particularly when subjected to heavy loads and stress, and they can be cumbersome for transportation and storage.
Innovation Solution
A utility access system featuring a base and sidewalls with alternating first and second ribs, along with exterior and interior fins, providing structural stability and allowing the box to be fabricated from lightweight materials like high-density polyethylene (HDPE) while achieving high load ratings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional utility access boxes are made from heavy materials like concrete to withstand heavy loads, then load-bearing capacity is improved, but weight increases making them cumbersome for transportation and storage
Solution Approach 1:
The utility access box is constructed from high-density polyethylene (HDPE), a composite polymer material that provides exceptional strength-to-weight ratio. This material choice enables the box to withstand heavy loads and achieve tier 22 rating while maintaining lightweight properties for easy transportation and storage, directly resolving the contradiction between load-bearing capacity and weight
Solution Approach 2:
The box incorporates a ribbed structural design with multiple internal ribs that segment the wall thickness into reinforced sections. These ribs create a truss-like internal framework that distributes and bears heavy loads across multiple points, enabling the lightweight HDPE material to achieve concrete-level load-bearing capacity without adding significant weight
2Stability of the object's composition
If the box is designed with reinforced walls to achieve high load ratings, then structural stability is improved, but manufacturing complexity increases
Solution Approach 1:
The internal ribbed structure segments the box walls into reinforced compartments, creating a truss-like framework that provides exceptional structural stability. This segmented design achieves high load ratings while remaining compatible with injection molding processes, as the ribs are integrated into the mold cavity rather than requiring post-manufacturing assembly
Solution Approach 2:
The ribbed reinforcement structures are merged directly into the box body through injection molding, creating a unitary component with integrated strengthening features. This combining of the reinforcement elements with the main structure eliminates separate manufacturing steps and assembly operations, maintaining ease of manufacture while achieving superior structural stability
Data Source
AI summary
A utility access system may include a base, a plurality of sidewalls extending vertically upward from the base and connected together to define a cavity therein with an opening at a top thereof and a rim inside the opening, and a lid configured to close the opening when received by the rim. Each of the sidewalls may include a plurality of first and second ribs extending from the base to the rim, with the first ribs extending outwardly away from the rim and the second ribs extending inwardly beneath the rim, at least one first fin on each first rib outside of the rim, and at least one second rib on each second rib beneath the rim and coupled thereto.