Aerogel Composite Materia in Fire-Resistant Cable of Bridge

Jiashao Bridge Breaks Industry Bottleneck: High-Performance Fire-Resistant Cable Protection System Successfully Applied

A major breakthrough has been achieved in bridge safety protection! After three years of intensive technological research and development, the Jiashao Bridge has successfully developed a high-performance fire-resistant cable protection system, which has been formally put into large-scale application on the actual bridge. This landmark achievement not only solves the long-standing industry challenge of protecting cables under fire threats but also elevates China’s bridge safety protection to an unprecedented new height.

Addressing a Long-Standing Industry Pain Point

For decades, the inadequate fire protection capability of traditional stay cable sheaths has been a critical bottleneck restricting the improvement of bridge safety. In the event of a fire, conventional sheaths fail to effectively insulate and protect the internal steel wires, posing severe risks to bridge structural safety and even leading to catastrophic consequences. Recognizing this urgent industry need, the Jiashao Bridge joined hands with multiple top scientific research institutions to launch a systematic research initiative targeting the root of the problem.

Innovative Three-Layer Integrated Protection Concept

Centering on fire dynamics and mechanisms, the R&D team conducted in-depth systematic innovation and constructed a comprehensive protection technology system. The core of this breakthrough lies in the pioneering "three-layer integrated protection" concept: internal heat insulation + middle fire resistance + external weather resistance, which forms a full-cycle, all-dimensional protective barrier for bridge cables.

• Inner Thermal Insulation Barrier: Combining Al₂O₃-SiO₂ aerogel composite material with high-silica fiberglass cloth, this layer achieves extraordinary heat insulation performance. As the first application of this ultra-light, ultra-low thermal conductivity material in bridge engineering, it can keep the temperature of internal steel wires below the critical failure threshold even after 90 minutes of continuous exposure to 1100℃ high-temperature flames — realizing the remarkable effect of "charred exterior with cool interior".

• Middle Fire-Resistant Sealing Layer: Adopting a high-silica fiberglass cladding process, this layer fits tightly to the cable surface, effectively blocking flame penetration. Beyond its fire-resistant function, it also completely solves the long-standing industry pain points such as aerogel powdering and cumbersome construction, significantly improving construction efficiency and structural stability.

• Outer Weather-Resistant Coating: The outer layer is made of PVF weather-resistant tape, which boasts excellent anti-aging, UV-resistant and corrosion-resistant properties. It can withstand harsh natural environments such as strong winds, heavy rains and intense ultraviolet radiation, ensuring the long-term stability and effectiveness of the entire protection system throughout its service life.

Far-Reaching Industry Significance

The successful R&D and application of this high-performance fire-resistant cable protection system mark a revolutionary leap in bridge cable safety technology. Its promotion and popularization will bring multiple core values to the bridge engineering industry: effectively enhancing the fire safety level of long-span bridges, extending the service life of cables by 30% or more, and reducing the whole-life cycle maintenance cost by optimizing protective performance.

As a benchmark project in China's bridge engineering sector, the Jiashao Bridge has once again demonstrated its technological leadership through this innovation. This achievement not only provides a reliable technical solution for the fire protection of existing and new bridges nationwide but also sets a new standard for the global bridge safety protection industry, contributing Chinese wisdom and solutions to addressing international bridge safety challenges.

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