Utility Manhole Cover With Hollow-Core Thermal Insulation
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Solution Overview
Problem
Existing manhole covers made of thermally conductive materials like cast iron become excessively hot when exposed to elevated temperatures from underground utility structures, posing safety risks and discomfort to users.
Innovation Solution
A manhole cover system featuring an insulation element with a hollow interior, potentially containing a vacuum or insulating gas like argon, coupled with a support member to reduce thermal transfer and include a fluid path for pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a manhole cover is made from thermally conductive metal to withstand vehicle weight, then strength is improved, but surface temperature becomes excessively high causing safety risks
Solution Approach 1:
The manhole cover system is divided into separate functional layers: a structural base layer for strength and a thermal insulation layer for temperature control. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The patent employs composite material construction combining thermally conductive metal for structural integrity with thermally insulating materials (such as cellular concrete, foam, or air gaps) to create a multi-layer assembly that simultaneously provides strength and thermal protection.
2Temperature
If insulation material is added to reduce thermal transfer, then surface temperature is reduced, but device complexity increases
Solution Approach 1:
The insulation structure is designed to serve multiple functions simultaneously: thermal insulation, structural support, and potential integration with the manhole cover mounting system. This multi-functionality reduces the need for separate components.
Solution Approach 2:
The insulation material is positioned within the structural framework of the manhole cover assembly, nesting the insulation function within the existing structural configuration. This integration minimizes additional complexity while achieving thermal protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces the temperature of the manhole cover surface, ensuring user safety and comfort while allowing easy removal and installation without damaging the insulation system.
Implementation Method 1
an insulation element is disposed in the opening... configured to reduce thermal transfer between the environment and the underground utility structure
Implementation Method 2
the insulation element having a hollow interior... the hollow interior having a pressure below ambient pressure
Implementation Method 3
an insulating gas disposed in the hollow interior. In addition to one or more of the features described herein, or as an alternative, the insulating gas is argon
Data Source
AI summary
An insulating manhole cover for an opening in an underground utility structure and a method of insulating underground utility structure includes an insulation element disposed in the opening. A support member is coupled to the insulation element, the support member being configured to operably couple with the opening. A cover is at least partially disposed within the opening and in contact with the support member opposite the insulation element.