Composite Cable Rack Arms With Saddles for Corrosion and Vibration
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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 stray currents, leading to safety hazards and cable support issues.
Innovation Solution
The development of plastic-housed cable rack arms with vibration dampeners and anti-friction pads, made from reinforced materials like glass-reinforced plastics, which are designed to withstand corrosion and provide durable support for cables while minimizing stress concentrations and vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal cable racks are used in underground environments, then cable support strength is improved, but corrosion resistance deteriorates due to moisture, humidity, and stray currents
Solution Approach 1:
The cable rack system combines metal components (for structural strength) with plastic housings and vibration dampeners (for corrosion resistance and vibration damping). This composite approach allows the metal rack arms to provide necessary mechanical support while the plastic elements protect against the harsh underground environment including moisture, humidity, and stray currents.
2Stability of the object's composition
If rigid cable rack structures are used, then structural stability is improved, but vibration transmission to cables increases
Solution Approach 1:
Vibration dampeners made of elastomeric material are introduced as intermediary elements between the rigid metal cable rack structure and the cables. These dampeners absorb and dissipate vibrations generated by equipment such as sump pumps, preventing direct transmission to the cables while maintaining the structural stability of the rack system.
3Device complexity
If cable racks are installed close to equipment generating vibrations, then space utilization is improved, but vibration-induced stress on cables increases
Solution Approach 1:
The vibration dampener serves as a protective intermediary positioned between vibration-generating equipment and the cable rack system. This allows the rack to be installed close to equipment for space efficiency while the dampener absorbs harmful vibrations and prevents them from creating excessive stress on the supported cables.
Solution Approach 2:
The elastomeric vibration dampeners are pre-installed on the cable rack arms before cables are attached, providing ahead-of-time protection against vibrations from nearby equipment. This preemptive cushioning prevents vibration-induced stress from reaching harmful levels before it can affect the cables.
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
The solution extends the service life of cable racks by resisting corrosion and vibration, ensuring reliable cable support and safety in challenging underground environments.
Implementation Method 1
a vibration dampener adapted to fit substantially within the plastic housing for mounting atop the cable rack arm
Implementation Method 2
an anti-friction pad adapted for smooth movement of the saddle along a length of the cable rack arm on which the saddle is mounted
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.