Method for Strengthening Reinforced Concrete Beams with Decentralized External Prestressed Cables

A reinforced concrete beam, external prestressing technology, applied in bridge reinforcement, bridge, bridge maintenance, etc., can solve the problems of complex tension anchor point structure, poor fire prevention and durability, large diameter of steel wire rope, etc., to achieve easy reinforcement operation, Good durability and fire performance, low construction cost

Active Publication Date: 2017-04-12
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for Strengthening Reinforced Concrete Beams with Decentralized External Prestressed Cables
  • Method for Strengthening Reinforced Concrete Beams with Decentralized External Prestressed Cables
  • Method for Strengthening Reinforced Concrete Beams with Decentralized External Prestressed Cables

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1, with reference to Figure 1-4 , Image 6 , a method for strengthening reinforced concrete beams with dispersed external prestressed cables, the steps are as follows:

[0023] (1) The first choice is to remove the loose part of the surface of the reinforced concrete beam 2, and clean the floating dust; then according to the design requirements, set the left anchor bolt 3 and the right anchor at the corresponding positions on both sides of the reinforced concrete beam 2 Bolt 4; open a 5mm deep notch in the bottom middle of the reinforced concrete beam 2 for installing the steering rod 7;

[0024] (2) Using the continuous winding method, the cable material 1 is bypassed by the anchor bolt 3 at the left end, and the anchor plate 5 is installed after the cementing material is applied to the anchorage of the anchor bolt 3 at the left end; Connect and tighten the material 1, fill the anchorage of the anchor bolt 4 at the right end with cementing material, insta...

Embodiment 2

[0025] Embodiment 2, with reference to Figure 5 , in the method for strengthening reinforced concrete beams with dispersed external prestressed cables described in embodiment 1: the tensioning device includes a base 9 with screw holes, and several screw rods 10 are installed on the base 9 through the mounting holes , The screw 10 is provided with a hooked head;

Embodiment 3

[0026] Embodiment 3, in the method for strengthening reinforced concrete beams with dispersed external prestressed cables described in Embodiment 1 or 2: the cable material 1 is selected from steel strands, steel wire ropes or high-strength FRP cables.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02E01D22/00
Inventor 蒋德稳李青松宗钟凌陈露霞
Owner HUAIHAI INST OF TECH
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