A depressed floor trap in architecture is a specialized drainage fixture designed to handle wastewater and prevent foul odors from entering indoor spaces.
It consists of a floor area that is slightly lower than the surrounding surface, allowing water to collect and flow into the trap. Inside the trap, a water seal is maintained to block sewer gases from escaping. Depressed floor traps are commonly found in areas where water spillage or cleaning is frequent, such as bathrooms, kitchens, and industrial settings.
This design improves hygiene, enhances drainage efficiency, and helps maintain a cleaner environment by ensuring proper water flow and odor control.
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Depressed floor trap detail drawing – 1
A depressed floor trap detail in construction can be described through its key components and structure. Imagine a cross-sectional view of the floor and drainage system.
Here’s a detailed description:
Floor Surface:
- The finished floor surface is slightly sloped towards the trap to guide water flow.
- Common materials include tiles, concrete, or epoxy, ensuring a waterproof surface.
Depressed Area:
- A recessed or lowered section of the floor, typically 50–100 mm below the surrounding floor level, creates a gentle slope directing water towards the trap.
Grating/Cover:
- A removable stainless steel or cast iron grating sits flush with the depressed floor.
- It prevents debris from entering the trap while allowing water to flow freely.
Trap Body:
- The trap body is a vertical or U-shaped pipe directly connected to the drainage line.
- It holds a small amount of water at all times, creating a water seal that prevents sewer gases from escaping.
Outlet Pipe:
- A horizontal outlet pipe connects the trap body to the main drainage system.
- It’s set at a slope (typically 1:100) to ensure smooth water flow.
Concrete Bed and Finishing:
- The trap is embedded in a concrete bed, ensuring stability and support.
- Waterproofing layers are applied around the trap area to prevent seepage.
Optional Vent Pipe:
- In some designs, a vent pipe is added to balance air pressure and improve drainage efficiency.
This setup ensures efficient water collection, odor prevention, and ease of maintenance.
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