Tunnel protection doors are primarily used in railway and highway tunnels, serving as critical protective facilities for equipment chambers and other spaces within tunnels. The following provides a detailed introduction to tunnel protection doors:

Functions

• Safety Protection: They prevent hazards to equipment and personnel in chambers caused by pressure shockwaves generated by train operations or gas shockwaves from explosions. For example, in railway tunnels, high-speed trains produce piston wind and transient pressure, and protection doors effectively block these pressures from impacting the chambers.

• Fire and Smoke Prevention: In the event of a tunnel fire, protection doors can prevent the spread of flames and smoke, buying time for evacuation and rescue. Their fire resistance typically meets the requirements for Class A fire doors.

• Space Isolation: They separate different areas within the tunnel, such as isolating equipment chambers from traffic passages, facilitating management and maintenance while preventing unauthorized entry into hazardous zones.

Application Scenarios

• Railway Tunnels: Used at connections between cross passages, repeater stations, substations, emergency rescue stations, shelters, and the tunnel. For instance, in extra-long tunnels, cross passages are installed at regular intervals, with protection doors at both ends to allow mutual evacuation and rescue during incidents.

• Highway Tunnels: Installed in equipment rooms, ventilation ducts, escape routes, and other areas within the tunnel to ensure the safety of personnel and equipment.

Performance Characteristics

• Strong Blast Resistance: Capable of withstanding explosion shockwaves of certain intensities, with blast resistance typically ranging from 0.05MPa to 0.1MPa. For example, protection doors in high-speed railway and intercity railway tunnels should have a blast load capacity of no less than 0.05MPa, while those in mixed passenger and freight railway tunnels should withstand no less than 0.1MPa.

• Excellent Fire Resistance: Made from fire-resistant materials, with a fire resistance rating usually exceeding 1.5 hours, effectively preventing the spread of fire.

• Corrosion Resistance and Durability: Due to the humid tunnel environment, protection doors are often made from corrosion-resistant materials such as stainless steel or fiberglass, ensuring a long service life.

• Superior Sealing Performance: Good sealing prevents the diffusion of smoke, dust, and other particles through door gaps, while also helping maintain stable air pressure within the tunnel.

• Flexible and Convenient Operation: Typically equipped with both electric and manual operation modes, allowing remote control or on-site manual operation. They can be quickly opened in emergencies without hindering rescue and evacuation efficiency.

Materials and Classification

• Materials: Common materials include steel, stainless steel, and fiberglass. Steel protection doors offer high strength but are prone to corrosion; stainless steel doors provide good corrosion resistance and an aesthetically pleasing appearance; fiberglass doors are lightweight, high-strength, corrosion-resistant, and offer thermal insulation.

• Classification: Classified by opening method into swing doors and sliding doors; by structure into single-leaf swing doors, double-leaf swing doors, and doors with ventilation windows; by material into all-fiberglass protection doors and composite doors with steel frames and fiberglass panels.

Relevant Standards and Specifications

• National Standards: For example, the "Code for Design of Metro" GB50157-2013 specifies that Class A fire doors should be installed in connecting passages, while the "Code for Design of Civil Air Defense Basements" GB50038-2005 requires protection doors to have a blast resistance of 0.10MPa.

• Industry Standards: For instance, the "Code for Design of Disaster Prevention, Evacuation, and Rescue Engineering for Railway Tunnels" TB10020-2017 stipulates that protection doors should be installed at the connections between cross passages and tunnels in emergency rescue stations, with a clear opening size of no less than 1.7m × 2.0m.