External prestressed tendon fireproof heat insulation device

Abstract

The invention relates to the technical field of bridge construction, and discloses an external prestressed tendon fireproof heat insulation device. The device comprises a bridge structure and an external prestressed tendon body connected to the bridge structure by arranging an anchoring part, the external prestressed tendon body is sleeved with a protection assembly, the protection assembly comprises a protection sleeve, a flexible resin sleeve and an expandable graphite inner pipe, the protection sleeve is made of a heat insulation material, and the protection sleeve, the flexible resin sleeve and the expandable graphite inner pipe are sequentially arranged on the external prestressed tendon body in a sleeving mode from outside to inside. The device has the characteristics of fire prevention, heat insulation, capability of ensuring that the bridge is not easy to collapse, and good safety.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a fire-proof and heat-insulating device for external prestressed tendons. Background technique [0002] At present, in bridge engineering, fire prevention design is rarely carried out for structures such as external prestressed tendons and other structures; Stress tendons play a role of heat insulation protection, so as to prevent its structure from softening due to high temperature, and fires that endanger the safety of the bridge rarely occur in the river valleys crossed under the bridge. Therefore, most of the existing technologies do not Fire protection design is carried out for external prestressed tendons; however, for flyover bridges and urban viaducts, the underside of the bridge may be threatened by explosion accidents, such as a deflagration accident in the one-sided lane under the flyover bridge or pedestrian bridge. Before the department rushes to the sce...

AI Technical Summary

Problems solved by technology

[0002]At present, in bridge engineering, fire protection design is rarely carried out for structures such as external beams, such as external prestressed tendons; , the bridge deck system and the bridge deck can protect the external prestressed tendons in the lower part from heat insulation, so as to prevent the structure from softening due to high temperature, which rarely occurs in the river valleys crossed under the bridge Fires that endanger the safety of bridges. Therefore, in the prior art, the external prestressed tendons will not be designed for fire protection; A deflagration accident occurred in the one-sided lane under the pedestrian bridge. Before the firefighting and traffic police departments rushed to the scene and carried out traffic control, there will still be traffic on the bridge deck and the opposite lane under the bridge. If the fire is extinguished, After the external prestressed tendons lose their function due to the softening of the high-temperature structure, it is easy to cause the collapse of the upper span bridge, which will not only cause large social and economic losses, but also cause extremely serious secondary accidents, endangering citizens Safety of life and property

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