Carbon fiber bar reinforcement device and method for reinforced concrete beam and slab

Abstract

The invention discloses a carbon fiber bar reinforcement device and method for a reinforced concrete beam and a reinforced concrete slab. The carbon fiber bar reinforcement method comprises the following steps: first, assembling a carbon fiber bar and anchorage devices, opening holes in a beam, fixing the anchorage devices to the beam by using chemical anchors, mounting a tensioning device and thecarbon fiber bar onto brackets, tensioning the carbon fiber bar by using a jack, and detaching the mounting brackets after tensioning is completed. The carbon fiber bar is used for reinforcing the reinforced concrete beam, so that the reinforced concrete beam has a smaller area than a carbon fiber plate, the carbon fiber bar reinforcement device and the carbon fiber bar reinforcement method are suitable for beam and slab reinforcement in civil buildings, and during anchorage, less holes need to be opened in an original structure, so that less damage is caused to the structure; the circular carbon fiber bar is directly fixed to supports through nuts, and no connection screw rod is required, so that the length of the anchoring end is short, the prestress loss is less, and the reinforced concrete beam and the reinforced concrete slab can be effectively reinforced; when walls exist at the two ends of the bottom of the beam required to be reinforced, the beam can be reinforced from two sides of the beam; the carbon fiber bar reinforcement device is simple in structure; the reinforcement method is easy to implement; the carbon fiber bar reinforcement device and the carbon fiber bar reinforcement method can be popularized and applied to a variety of occasions where reinforced concrete reinforcement is required.

Description

technical field [0001] The invention belongs to the field of building construction, and in particular relates to a carbon fiber reinforcing device and a reinforcing method for reinforced concrete beam slabs. Background technique [0002] Carbon fiber composite materials have the advantages of high strength and corrosion resistance, and are widely used in the reinforcement of concrete structures. The strength of carbon fiber composite materials is 5-10 times that of ordinary steel bars, but the elastic modulus is equivalent to that of ordinary steel bars. Therefore, the ordinary method of pasting carbon fiber sheet reinforcement can only exert its high-strength characteristics when the concrete beam is greatly deformed. The performance is not improved much, and the strength of the material cannot be fully utilized. Applying prestress to the carbon fiber and anchoring it to the beam can not only reduce the deflection of the beam, improve its normal performance, but also incre...

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Problems solved by technology

At present, prestressed carbon fiber boards are commonly used to strengthen concrete beams, which have high anchorage efficiency and are not prone to anchorage failures leading to structural damage.

However, due to the large cross-sectional width and area of ​​carbon fiber plates, it is suitable for strengthening large-scale components, but it is not suitable for most beams and slabs in civil buildings; the anchorage area of ​​​​the tension end and the anchor end is long, and the tension construction requires a large space. The effective reinforcement area is short; there are many holes at the tension end, which will cause great damage to the structure; the carbon fiber plate and the anchor are connected to the support through a nut connection screw, and the prestress loss at the tension end and the anchor end also includes the loss caused by the long screw , the prestress loss is large; for the side reinforcement of the beam, the reinforcement of the carbon fiber plate cannot be deformed with the deformation of the beam due to the high rigidity in the plane of the plate, and it is easy to peel off from the beam after being stressed, resulting in failure

[0003] Chinese patent (publication number: 106481092A) discloses a prestressed carbon fiber reinforced reinforced concrete anti-corrosion reinforcement device, which uses carbon fiber reinforced composite bars to reinforce reinforced concrete, but it places carbon fiber reinforced composite bars in reinforced concrete. It is installed during reinforced concrete construction and stretched on both ends of the beam, so it cannot be used in some reinforced concrete constructions that need to be repaired and reinforced later

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