Method for strengthening reinforced concrete beam through distributed external prestressing cables

Abstract

The invention provides a method for strengthening a reinforced concrete beam through distributed external prestressing cables. Loose portions of the surface are removed, a left anchoring bolt and a right anchoring bolt are respectively and correspondingly arranged on two sides of a strengthened reinforced concrete beam, the middle bottom portion of the strengthened reinforced concrete beam is high, a steering rod notch can be installed at the middle bottom portion of the strengthened reinforced concrete beam, the cables pass through the left anchoring bolt in winding mode by adopting a continuous winding method, a cementing material is coated at the anchoring position to install an anchoring plate, the cables are connected and tightened on the right anchoring bolt through a clamping buckle, a cementing material is filled at the anchoring position to install an anchoring plate, and the anchoring plate is tightened. After the cementing material is hardened, a tension device is used for performing synchronous tension, and then the steering rod with glue is installed in the notch to support the cables. After all the cables are installed, adhesion agent is painted, polymer mortar is smeared to cover the cables and the anchoring plates, and screeding maintenance is performed. The high-strength cables are arranged in distributed mode, a vertical tension method is used, tensile force is reduced greatly, and construction is convenient. The cables are arranged in distributed mode so as to enable stress of construction members to be more reasonable.

Description

technical field [0001] The invention relates to a method for reinforcing building components, in particular to a method for reinforcing reinforced concrete beams with dispersed external prestressed cables. Background technique [0002] The traditional external prestressing technology for strengthening concrete beams is to install high-strength steel wire ropes on the side and bottom of the beams, set anchor tension points at the ends, and connect the ends of the cables with screws. After the installation is in place, screw the nuts to pre-stress the cables. Stress tension. Among them, the high-strength steel wire rope is the main body of the force, and the force is transmitted to the beam through the steering rod to improve the bearing capacity of the beam and realize the unloading of the original structure. The characteristics of external prestressed reinforcement are as follows: high-strength steel wire rope has high strength (1500-1600MPa), good durability, convenient tr...

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Problems solved by technology

However, the traditional external prestressed reinforced concrete beam technology also has the following shortcomings: the connection between the high-strength steel wire rope and the screw requires special processing, and the cost is high; the anchor device can only anchor a single steel wire rope; in order to meet the requirements of bearing capacity, the diameter of the steel wire rope Large; when the reinforcement method is used to stretch the steel wire rope, the construction is difficult due to the large tension force; the tension anchor point has a complex structure, large size, and high cost; Difference

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