钢结构桥梁的被动抗火结构及其安装方法
By setting a combined structure of a keel frame and a fireproof layer below the lower flange of the steel beams of the steel structure bridge, the problem of excessively high temperature in steel structure bridges under truck fires has been solved, and the structural safety and disaster resistance have been improved under extreme fire conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING GENERAL MUNICIPAL ENG DESIGN & RES INST
- Filing Date
- 2025-12-22
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies lack mature passive fire protection solutions for steel structure bridges, especially in the case of a large truck fire, where the temperature at the bottom of the steel beam can reach over 1000 degrees Celsius, potentially leading to bridge collapse.
A passive fire-resistant structure consisting of a keel frame and a fireproof layer is installed below the lower flange of the steel beams of a steel structure bridge. The combination of the keel frame and the fireproof layer forms a fire-resistant protective layer that blocks the direct action of flames and high-temperature heat flow. The combination of angle steel and composite fireproof board enhances the fire resistance and connection reliability of the structure.
It significantly reduces the thermal intensity of the lower flange of the steel beam, slows down the rate of temperature rise, improves the structural safety and disaster resistance of steel bridges under extreme fire conditions, prevents the steel beam from weakening or becoming unstable due to high temperature, and enhances the reliability and durability of the connection.
Smart Images
Figure CN121719152B_ABST