Composite Safety Landing Platforms for Sewer Shafts
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Solution Overview
Problem
Existing safety landings for longitudinally extending shafts, such as sewer manholes, face issues with corrosion and damage in harsh environments, and often require complex installation and maintenance, limiting their effectiveness and durability.
Innovation Solution
A safety landing system featuring pivotably and translatably connected platforms with abutment surfaces that self-lock in the open position, allowing for easy access and secure closure, and constructed from composite materials like fiberglass reinforced polymers to mitigate corrosion, with a simplified attachment mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional safety landing platforms are used in harsh environments, then they provide basic safety function, but they suffer from corrosion and damage reducing their durability
Solution Approach 1:
The platform is constructed from composite materials specifically fiberglass reinforced polymers, which provide superior resistance to corrosion and environmental damage compared to traditional metals or plastics. This composite construction maintains structural integrity and safety functionality while eliminating the corrosion problems that plague traditional materials in harsh environments.
2Reliability
If complex installation mechanisms are used for safety landings, then they may provide more secure attachment, but they increase installation and maintenance complexity
Solution Approach 1:
The attachment system is divided into separate modular components including attachment portions on the support panels and corresponding receptacles in the shaft structure. This segmentation allows for simplified installation where components are assembled in place rather than requiring complex pre-integrated mechanisms, reducing both installation and maintenance complexity while maintaining secure attachment.
3Reliability
If platforms are designed to remain securely closed, then they provide continuous safety protection, but they require manual intervention to open for access
Solution Approach 1:
The platform incorporates a self-latching mechanism with engagement surfaces that automatically secure the platform in the closed position without requiring manual locking. The design includes protrusions and recesses that engage automatically when the platform is closed, providing continuous safety protection while eliminating the need for manual intervention to maintain the secured state. Opening simply requires disengaging the latch mechanism.
4Ease of operation
If platforms are made movable between open and closed positions, then they allow easy access, but they risk accidental closure compromising safety
Solution Approach 1:
The platform design incorporates preliminary anti-action through spring-loaded or gravity-assisted positioning mechanisms that naturally bias the platform toward the open position. The engagement surfaces are configured so that accidental closure forces are insufficient to overcome the biasing mechanism and engage the latching surfaces. Only deliberate closing actions with sufficient force can overcome the preliminary anti-action and secure the platform, preventing accidental closure while maintaining ease of access.
Data Source
AI summary
A safety landing may include a first support panel positionable within the shaft and having a first support surface and a second support surface spaced apart from the first support surface. At least a first platform may have a first end that is movably connected to the first support panel and a second end spaced apart from the first end. The first platform may have an upper surface, an opposing lower surface and an end surface at the first end. The first platform may be movably between a closed position in which the first platform extends laterally across the shaft, and in which the lower surface rests on the first support surface and an open position in which the first platform is generally upright and the end surface of the first platform rests on the second support surface.