Buoyant Float Assembly for Underground Vent Flood Protection
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Solution Overview
Problem
Existing solutions for preventing flooding in underground ventilation passages often either block water entry or allow ventilation, but not both simultaneously, especially during heavy rains, leading to operational disruptions in urban areas like New York City.
Innovation Solution
A buoyant float system within a ventilation shaft chamber that elevates a grating above ground level when water enters, blocking surface water from entering the ventilation passage while maintaining airflow, with optional configurations reducing the weight the float must lift to accommodate larger ventilation passageways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive systems are used to block flooding water from entering underground ventilation passages, then flooding is prevented, but ventilation is closed off and underground operation is disrupted
Solution Approach 1:
The invention uses a dynamic grating system that can move between open and closed positions based on water level conditions. The grating is attached to a float mechanism that automatically adjusts its position: remaining open during normal conditions to allow ventilation, and closing when water rises to block flooding. This dynamic adjustment resolves the contradiction by making the system adaptive rather than static.
Solution Approach 2:
The system employs a self-actuating float mechanism that automatically responds to water level changes without external control. When water rises and contacts the float, the buoyant force automatically triggers the grating to close, and when water recedes, the grating automatically opens. This self-service capability ensures continuous ventilation operation unless flooding conditions require closure.
2Object-affected harmful factors
If the float lifts the entire grating to block water, then flooding is prevented, but the float must be large and heavy, reducing ventilation area
Solution Approach 1:
The grating is divided into two functional segments: a stationary portion that remains fixed to maintain continuous ventilation area, and a movable portion attached to the float that only closes when needed. This segmentation allows the system to prevent flooding by closing the movable segment while the stationary segment continues to provide airflow, thus resolving the contradiction between flooding protection and ventilation area.
Solution Approach 2:
The invention extracts the flooding-blocking function from the entire grating and assigns it only to a specific movable portion. The stationary portion of the grating is removed from the float mechanism, allowing it to remain fixed and provide continuous ventilation. Only the necessary blocking function is extracted and assigned to the float-actuated segment, minimizing impact on ventilation area.
3Object-affected harmful factors
If the grating is covered completely to block water, then flooding is prevented, but airflow is blocked and ventilation stops
Solution Approach 1:
The grating system implements local quality by having different portions serve different functions: the stationary portion maintains open quality for continuous airflow, while the movable portion has the capability to close locally when water contact is detected. This localized response ensures that flooding prevention occurs only where and when needed, while ventilation continues through the stationary open portion.
Solution Approach 2:
The system transitions from a static fully-covered grating to a dynamic partially-movable configuration. The movable portion dynamically adjusts its coverage based on water level, remaining open during normal operation to allow ventilation and closing only when flooding occurs. This dynamic behavior resolves the contradiction by making coverage conditional rather than constant.
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 prevents flooding in underground ventilation passages while ensuring continuous ventilation, even during heavy rains, by elevating the grating above water levels without requiring the float to lift the entire grating, thus allowing for larger airflow areas and uninterrupted operation.
Implementation Method 1
A buoyant float system within a ventilation shaft chamber that elevates a grating above ground level when water enters
Data Source
AI summary
An assembly that fits within a ventilation shaft open to atmosphere and leading from underground ventilation ducts such as to subways prevents surface waters from flooding the underground ducts while maintaining the ventilation. The assembly fits in the ventilation shaft and houses a buoyant float in a chamber surrounding a passageway in fluid communication with the ventilation shaft. A grate covers the passageway. An outside wall of the chamber adjacent the ventilation shaft is open at top to atmosphere and allows flooding water into the chamber, buoying the float upward in the chamber, elevating the passageway above the flooding water. The chamber suitably has means for drainage and admission of flush water to flush flood water debris from the chamber through the drainage.