Ventilation Shaft Panel Closure for Subway Flood Protection
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Solution Overview
Problem
Underground ventilation systems, such as subway tunnels and chambers, face flooding issues due to surface storm waters entering through ventilation ducts, leading to inadequate flood control and costly, labor-intensive solutions like raising grates or using sandbags, which are not effective in preventing water ingress during severe weather events.
Innovation Solution
A manually operable panel apparatus is installed within ventilation shafts, allowing normal ventilation but capable of being rotated by gravity to a closed position using pivot axes and stops to prevent water entry during flooding threats, featuring a support structure that fits various shapes and orientations of openings, with panels that can be manually raised and sealed to prevent water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation grates are raised above sidewalk level to prevent flooding, then flood protection is improved, but sidewalk area for pedestrians is reduced and implementation cost increases
Solution Approach 1:
The patent applies the dynamics principle by implementing a movable panel that can transition between an open position (allowing ventilation and pedestrian access) and a closed position (blocking flood water). The panel is hinged at the bottom and can be rotated to seal the opening when flood conditions are detected, providing dynamic flood protection without permanently reducing sidewalk area or ventilation capacity.
2Reliability
If sandbags and plywood covers are used to prevent subway flooding, then flood protection is improved, but labor and materials intensity increase and response time is delayed
Solution Approach 1:
The patent applies the preliminary action principle by pre-installing the hinged panel structure in the ventilation shaft before flood events occur. The panel is positioned and secured in advance, with the hinge mechanism pre-configured to allow rapid deployment. When flooding is anticipated, the panel can be quickly activated without requiring on-site assembly or manual placement of protective materials, significantly reducing response time.
3Ease of operation
If a hinged panel system is installed in ventilation shafts, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent applies the taking out principle by extracting the complex control mechanism from the panel system itself and replacing it with a simple gravity-based hinge mechanism. The panel relies on its own weight and the hinge's mechanical properties to automatically seal the opening when flood water exerts pressure, eliminating the need for motors, sensors, or complex control systems while maintaining ease of operation.
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
This solution provides a simpler, faster, and more effective method to prevent flooding by allowing ventilation during normal conditions and automatically sealing the opening during flooding events, reducing the need for costly infrastructure changes or labor-intensive measures like sandbagging.
Implementation Method 1
capable of being rotated by gravity to a closed position using pivot axes and stops
Data Source
AI summary
Apparatus for allowing ventilation for underground tunnels through a ventilation shaft opening to atmosphere yet preventing underground flooding from surface waters pouring through the grate comprises an assembly that fits within the ventilation shaft and includes one or more panels mounted on a pivot axis and rotatable upwardly by human action raising the panel past a center point of the pivot axis to an upright inwardly leaning home position that allows ventilation as usual but by manual push or pull of the panels past the center point of the pivot axis lets the panels rotationally fall under gravitational impetus to a lower sealing position closing a passage between the ventilation shaft and atmosphere to prevent water from entering the underground tunnels.