Bridge reinforcing method and uses of prestress reinforced steel wire net anchor in bridge reinforcement

Abstract

The invention discloses a bridge reinforcing method. In the reinforcing method, a pre-stressed high-intensity wire netting anchorage device is used for reinforcing a bridge. The pre-stressed high-intensity wire netting anchorage device comprises an anchorage piece (1), a bolt (2), a screw rod (3) and a clamping piece (4), wherein the bolt is arranged in a through hole of the anchorage piece; the screw rod and the clamping piece are arranged in the through hole of the bolt and connected with each other; the taper angle of the clamping piece is more than that of the through hole of the bolt; and the difference between the two taper angles is between 0.05 and 0.5 degree. The anchorage device adopted in the invention has the advantages of reliable anchorage performance, enough bearing capacity, durability, simple and convenient construction, immediate stretching and drawing after assembly, convenient centering, high interchangeability, high environment adaptability and capabilities of anchoring small flat anchors of a plurality of high-intensity steel wires, bringing the intensity of a pre-stress rib into full play and safely realizing stretching and drawing operation. The bridge reinforcing method of the invention has the advantages of wide use range, simple and convenient construction, low cost and capabilities of bringing the intensity of the pre-stress rib into full play, safely realizing the stretching and drawing operation and remarkably improving the bearing capability of the bridge.

Description

technical field [0001] The invention relates to a bridge strengthening method. Background technique [0002] According to the 2006 National Highway Statistical Annual Report, as of the end of 2005, there were 10,443 dangerous bridges in the country with a length of 378,439 meters, including 1,942 dangerous bridges in the middle of the road with a length of 110,000 meters. There are more than 12,000 bridges (about 470,000 linear meters) on the national and provincial highways whose technical status is Class III, and there are obvious safety hazards. Once they are affected by emergencies such as heavy traffic and natural disasters, these bridges are likely to turn into dangerous bridges . Therefore, a huge number of bridges need to be repaired, strengthened and reconstructed. [0003] Commonly used bridge reinforcement methods include external prestress reinforcement method, enlarged section reinforcement method, pasting steel plate reinforcement method, pasting carbon fiber...

AI Technical Summary

Problems solved by technology

[0005] In the traditional clip-type anchorage, the cone angle of the clip and the anchor cup is the same. During the tensioning process of the anchor, as the tension increases, the force of the clip against the anchor cup also increases, so that the anchor cup Deformation occurs, causing the cone angle to become larger, so that the force uniformly distributed along the entire length of the clip is concentrated to the small end of the clip, resulting in the wire rope being shallow at the large end and deep at the small end of the clip mark along the entire length of the clip, so that the wire rope does not reach the specified limit Tensile force, destroyed by stress concentration on the wire rope

Images