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Fireproof partition for blocking bridge openings

Fireproof partitions for bridge openings can be constructed using modular fire-blocking sections, intumescent boards, or composite fire barrier sheets, providing up to 4 hours of fire resistance while allowing easy installation and maintenance. Materials and Systems1.

Modular Fire-

Blocking Sections Lightweight modular fire-blocking sections are designed for cable trenches, tunnels, and bridge openings. They typically consist of intumescent blocks, fireproof cloth, and a metal frame coated with fireproof material, forming a double-layer barrier that expands under high temperatures to seal cavities and prevent fire spread. These systems are lightweight (≤5 kg per unit), easy to install, and allow non-destructive addition or removal of cables without compromising fire protection.

They are certified for 2-hour fire resistance (GB23864) and have a service life exceeding 30 years. 2. Fire Barrier Composite Sheets Products like 3M™ Fire Barrier Composite Sheet CS-195+ combine intumescent material, steel, wire mesh, and aluminum foil to create a flexible firestop for larger openings, including cable trays and conduits.

These sheets are fire-tested up to 4 hours (ASTM E814/UL 1479) and provide a tight seal against flames, smoke, and toxic gases, while also conducting heat away to protect adjacent equipment. 3.

Fire-

Rated Partitions and Doors For structural partitions, fire-rated walls with protected openings can be constructed using systems like GypWall, GypLyner, or GypWall Shaft, following BS EN 1364-1: 2015 standards. Openings for doors, access panels, or penetrations must maintain minimum spacing (300–600 mm) between openings to preserve structural integrity and fire performance. Fire-rated doorsets and riser doors can be integrated without affecting adjacent openings.

Installation Considerations

Ensure full-height framing support around openings to maintain lateral stability and limit deflection under fire conditions. Use intumescent or fireproof sealants to cover exposed metal frameworks and maintain acoustic and fire performance. Modular systems allow quick installation (≈20 minutes per unit) and easy maintenance, which is critical for bridge or tunnel applications where access may be limited.

For larger penetrations, prefabricated firestop bricks or composite sheets can be used to fill voids and provide continuous fire resistance.

Compliance and Standards

Follow AST

M E119, UL 263, or BS EN 1364-1 for fire-resistance ratings of walls and partitions. Firestop systems should be tested and listed, ensuring proper containment of fire, smoke, and toxic gases. Modular fire-blocking components should hold certifications such as CCCF and comply with national fireproof material standards.

Summary

For blocking bridge openings, the most effective fireproof partitions combine modular, lightweight, and intumescent materials with structurally supported fire-rated walls. These solutions provide high fire resistance, ease of installation, and maintainability, while complying with international fire safety standards. Depending on the size and type of opening, options include modular fire-blocking sections, composite fire barrier sheets, or integrated fire-rated partitions with doors and access panels.

Fireproof partition for blocking bridge openings

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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