A reinforcement method for fire-damaged bridges

Abstract

The invention discloses a reinforcing method of a fire-damaged bridge, and belongs to the field of construction methods. The reinforcing method comprises the following steps of for a fire-damaged hollow slab beam or T-shaped beam or small box girder of the bridge, chiseling the loose and fallen concrete at the lower surface of the fire-damaged hollow slab beam or T-shaped beam or small box girder by an artificial chiseling method, and flushing and clearing the concrete at the lower surface of the beam slab by a high-pressure water launce; lifting a steel plate or a steel beam, casting a high-strength adhering material, and reinforcing the damaged part. The reinforcing method has the advantages that the vertical rigidity and integrity of the fire-damaged bridge can be greatly improved, and the operation and carrying capacity of the bridge can be restored as soon as possible; by adopting the bracket-free reinforcing construction method, the problem of insufficient vertical rigidity and transverse integrity of the bridge is solved, and the problem of failure to erect the bracket under the bridge or higher erection cost of the bracket is solved; the consuming time of reinforcing procedure is short, the construction is convenient, and the like.

Description

technical field [0001] The invention belongs to the field of construction methods, and in particular relates to a method for reinforcing bridges damaged by fire. Background technique [0002] In recent years, China's highway and bridge construction has developed rapidly. The number of fires caused by combustible materials under highway bridges, especially bridges at the urban-rural junction, is difficult to control due to many influencing factors, and the number of fires is gradually increasing. The fire not only causes serious economic losses, but also the strength and elastic modulus of the reinforced concrete structure of the bridge will decrease under the physical and chemical action of the fire, and the bond strength between the steel bar and the concrete will decrease accordingly, and the cross-sectional load of the bridge will decrease. The force will also be reduced, causing bridge safety hazards and affecting road operation safety. Therefore, it is necessary to qui...

AI Technical Summary

Problems solved by technology

This method can indeed play a role in strengthening in theory, but the applicant found that in the actual use process, on the one hand, because the steel plate only covers the overheated bottom plate and part of the web, the load will gradually concentrate in the subsequent use process. The web where the steel plate is not covered poses a hidden danger to the structural safety of this part of the area; on the other hand, the steel plate is fixed by implanting steel bars into the beam body, which will weaken the bending stiffness of the beam and affect its bearing capacity

At the same time, dense concrete is used for filling, and the bonding performance between it and the original concrete and steel plate is insufficient, which can easily lead to falling off

Furthermore, the above-mentioned construction method requires the laying of supports, which is not only time-consuming, but also affects the speed of operation and traffic, and cannot be used in areas where there is a need for traffic under the bridge and other areas where it is difficult to erect supports.

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