A prestressed cfrp slab tension anchor device for strengthening steel beams and composite beams

Abstract

The invention discloses a prestressed CFRP plate tensioning and anchoring device for reinforcing steel beams and composite beams. The prestressed CFRP plate tensioning and anchoring device comprises a positioning steel bracket, a tensioning steel bracket, a lock nut, a guiding screw, an adjusting nut, a separation and union steel channel, a center hole jack, a positioning baffle, a steel bracket support and high-strength bolts. Wedged clamping pieces are arranged inside the tensioning steel bracket and the steel bracket support, and a CFRP plate is clamped through friction force, so that clamping is safe, reliable and durable; and structural adhesives and chemical anchor bolts are not used. The positioning steel bracket, the tensioning steel bracket and the steel bracket support are provided with triangular stiffening ribs, so that the strength and local stability of the device are improved. The jack is located outside a tensioning unit, tensioning construction longitudinal space is greatly reduced, and the jack can be conveniently removed after tensioning is completed. The prestressed CFRP plate tensioning and anchoring device provided by the invention is simple in structure, clear in mechanics-flow and convenient to construct; the high strength performance of fiber materials is fully utilized, the application field of the prestressed CFRP plate reinforcing technology is widened, and the prestressed CFRP plate tensioning and anchoring device can be widely applied to reinforcing engineering of steel bridge structures and combined structures.

Description

technical field [0001] The invention belongs to the field of bridge steel structure and composite structure reinforcement, and relates to a novel prestressed CFRP plate tension anchoring device, which is especially suitable for the reinforcement design and construction of I-shaped steel plate girder bridges and steel box girder bridges. Background technique [0002] Carbon fiber sheet (Laminate) is divided into carbon fiber cloth (Sheet) and carbon fiber plate (Plate). Due to the small amount of carbon fiber cloth reinforcement and unstable quality performance, it is gradually replaced by carbon fiber sheets. The combination of "external prestressing technology" and "adhesive fiber composite material reinforcement technology" can give full play to the high-strength properties of the material, effectively delay structural cracking, and avoid premature peeling damage. Due to the improvement of the design concept, this method has become the mainstream of domestic fiber reinfor...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the purpose of the present invention is to provide a prestressed CFRP plate tension anchoring device for reinforcing steel beams and composite beams, and solve the following technical problems at the same time: 1. The connection mode between the anchorage and the CFRP plate does not rely on structural glue and chemical anchors bolts to avoid the durability problems of traditional adhesive anchors and the stress concentration problems of perforated steel plates; Local stability; 3. Optimizing the external dimensions of each component to reduce the tensioning implementation space and reduce the anchorage production cost

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