Projects & Case Studies
Chongqing Rail Transit Line 5
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Project Case: Chongqing Rail Transit Line 5
Heavy-Duty Steel Fire Doors & Utility Door Systems for Urban Mass Transit
Our company engineered, manufactured, and supplied specialized fire-rated steel doors and heavy-duty subway utility doors for Chongqing Rail Transit Line 5, a major cross-river artery in Chongqing's urban transit network.
Built to withstand severe piston air pressure shocks, high humidity, and heavy daily foot traffic, our door systems provide reliable fire compartmentation, structural rigidity, and long-term durability across complex underground stations and elevated transit hubs.
Project Overview
Project Name: Chongqing Rail Transit Line 5
Location: Chongqing, China
Facility Type: Urban Mass Transit & Underground Railway Network
Product Scope: Custom Fire-Rated Steel Doors, High-Pressure Utility Doors, Emergency Exit Assemblies, and Stainless Steel Access Doors
Key Application Areas: Platform Tunnels, Station Concourses, Substation Control Rooms, Ventilation Shafts, and Emergency Passenger Passages
Key Challenges & Engineered Solutions
1. High Piston Air Pressure & Dynamic Stress
Challenge: High-speed subway trains passing through tunnels generate continuous cyclic air-pressure fluctuations (piston effect) that strain door leaves and frames.
Solution: Manufactured heavy-duty double-skin galvanized steel doors reinforced with internal steel channel stiffeners to resist dynamic pressure shocks without structural deformation.
2. certified Underground Fire Safety & Smoke Control
Challenge: Underground metro environments require strict fire compartmentation and smoke sealing to ensure clear, safe evacuation routes.
Solution: Supplied 60-minute to 120-minute fire-rated steel doors equipped with high-expansion intumescent smoke gaskets, heavy-duty panic push bars, and certified automatic door closers.
3. Humidity & Corrosion Resistance
Challenge: High humidity levels in underground tunnel structures accelerate rust and surface corrosion on metal components.
Solution: Finished all steel door assemblies with multi-layer anti-corrosion primers and durable electrostatic powder coatings, ensuring long service life with minimal maintenance.
Key Project Accomplishments
CNC Precision Manufacturing: Produced using advanced CNC laser cutting and automated bending machinery for exact fit within tight civil engineering tolerances.
Transit Authority Compliance: Passed rigorous municipal transit safety tests for fire endurance, pressure resistance, and structural stability.
Full OEM/ODM Project Delivery: Provided complete end-to-end support, including CAD drawing customization, site coordination, and scheduled batch site deliveries.
Partner with a Trusted Global Steel Door Manufacturer
From underground metro networks and transportation hubs to industrial plants and hospital infrastructure projects, we provide certified OEM/ODM steel door solutions engineered to global standards. Contact our technical team today for CAD drawings, specification sheets, and factory-direct project quotes.
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Technical Knowledge Base
Q
What is the main difference between UL 10C and EN 1634 steel fire door standards?
A
Testing Method: UL 10C requires mandatory hose stream impact testing; EN 1634 tests both fire integrity (E) and thermal insulation (EI) parameters.
Fire Ratings: UL ratings range from 20 to 180 minutes (3 hours); EN ratings are classified as 30, 60, 90, or 120 minutes.
Regional Usage: Choose UL 10C for Saudi/GCC projects following NFPA guidelines; select EN 1634 for European and British-standard-aligned project specifications.
Q
How long can commercial steel fire doors withstand direct high temperatures?
A
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