A method for strengthening concrete beams with prestressed carbon fiber plates and steel-concrete

Abstract

The invention provides a method for reinforcing concrete beam by a prestressed carbon fiber plate and steel-concrete. The method comprises the following main steps of firstly, chiseling off a concrete protecting layer on the bottom surface of the concrete beam, drilling and embedding steel bars, and arranging a layer of a steel bar mesh; secondly, blanking a steel plate, and respectively welding waved toothed plates at an anchoring end and a tensioning end of the steel plate for constraining the carbon fiber plate; thirdly, fixing the steel plate on the steel bar mesh, and taking the reinforcing steel plate as a bottom die to prepare and cast self-compacting concrete; fourthly, applying prestress by adopting a jack, tensioning the carbon fiber plate and anchoring; finally, varnishing cement composite mortar on the surface of the prestressed carbon fiber plate and the waved toothed plates as protecting layers to finish the bending resistance and reinforcing of concrete. According to the reinforcing method provided by the invention, the convenience in construction is realized, and the required equipment is simple; the bending capacity, rigidity and the durability of the existing concrete beam can be remarkably improved, and the service life is prolonged; the reinforcing method is particularly suitable for conditions of concrete spalling, carbonization and other damages at the bottom of the concrete beam.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering in the discipline of civil engineering, and in particular relates to a method for reinforcing concrete beams with prestressed carbon fiber plates and steel-concrete. Background technique [0002] With the rapid development of social economy and transportation, the traffic flow has increased significantly, the traffic density and vehicle load are increasing, coupled with the erosion of the bridge environment, a large number of bridges in my country have accelerated aging and insufficient bearing capacity. problems, and due to construction, environmental impact and other reasons, the concrete of the bridge protective layer is seriously carbonized, and the protection ability of the internal steel bars is reduced, and with the cracks on the concrete surface, the corrosion of the internal steel bars of the bridge structure is accelerated, and the bridge bearing capacity drops rapidly. , so tha...

AI Technical Summary

Problems solved by technology

However, when the composite structure is used for reinforcement, the gap between the formwork and the original components is small, and ordinary concrete is used, the concrete cannot be vibrated and compacted, the quality of the concrete cannot be guaranteed, and the old and new concrete cannot work together effectively, which limits the reinforcement of the composite structure application of technology

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