Composite Cable Rack Arms for Corrosion-Resistant Underground Support
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Solution Overview
Problem
Existing cable racks in underground manholes, vaults, and tunnels are prone to corrosion and failure due to harsh environmental conditions, including moisture, humidity, and exposure to contaminants, leading to potential power and communication disruptions and safety hazards.
Innovation Solution
The development of cable rack arms and stanchions made from glass-reinforced plastic materials, including nylon and fiberglass, which are molded to provide strength, resistance to corrosion, and ability to withstand heavy loads, with features such as gussets and non-metallic saddles to secure cables and absorb vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal cable racks are used in underground manholes, then structural strength and load-bearing capacity are achieved, but corrosion resistance and service life are compromised due to harsh environmental conditions
Solution Approach 1:
The patent employs composite materials, specifically glass-reinforced plastic (GRP) and fiberglass-reinforced nylon, to manufacture cable rack arms and stanchions. These composite materials provide both the required structural strength and superior corrosion resistance, eliminating the contradiction between metal strength and corrosion vulnerability in harsh underground environments.
2Ease of operation
If metal cable supports are deployed in underground environments, then cable organization and support are provided, but vulnerability to moisture, humidity, and contaminants leads to failure
Solution Approach 1:
The patent changes the material parameter from traditional metal to composite materials (GRP, fiberglass-reinforced nylon), which fundamentally alters the material's interaction with harmful environmental factors. The composite materials maintain structural integrity and cable organization functionality while being inherently resistant to moisture, humidity, and chemical contaminants.
3Duration of action of stationary object
If glass-reinforced plastic materials are used for cable rack arms, then corrosion resistance and service life are extended, but manufacturing complexity and molding requirements increase
Solution Approach 1:
The cable support system is divided into separate components (stanchions, arms, saddles) that can be individually molded from composite materials. This segmentation allows for optimized manufacturing of each component while maintaining the overall system's corrosion resistance and extended service life, making the complex molding process more manageable.
4Object-affected harmful factors
If non-metallic saddles are used to secure cables, then vibration damping and corrosion resistance are improved, but load-bearing capacity and cable securing strength may be reduced
Solution Approach 1:
The non-metallic saddles are constructed from composite materials (GRP, fiberglass-reinforced nylon) that provide both vibration damping properties and sufficient load-bearing capacity. The composite structure absorbs vibrations while maintaining the strength needed to securely hold cables, eliminating the trade-off between vibration damping and securing strength.
Data Source
AI summary
A cable rack arm and support system suitable for underground power and communication service is made from reinforced non-metallic polymers that will not rust or corrode. A cable rack arm up to thirty inches long may be compression molded with long glass fibers in a polyester or vinylester matrix. Each cable rack arm is securely mounted to a non-metallic stanchion that may be made from a reinforced, pultruded composite material. Nonmetallic pins may be used to secure the cable rack arms to the stanchions. Each cable rack arm then supports one or more cables in cable saddles that are snap-fit atop the arm, thus keeping the cables accessibly organized in a manhole, tunnel or vault. Each saddle may include elastomeric dampening material to reduce shock and vibration in the mechanical and electrical environment in underground tunnels, vaults and manholes.