An external prestressed anchorage device and rapid reinforcement method for concrete bridges

Abstract

The invention relates to an external pre-stressed anchoring device for a concrete bridge body and a rapid strengthening method. The anchoring device comprises two anchoring pieces with symmetrical structures, wherein the anchoring pieces are arranged at two sides of the concrete bridge body; an anchor cable is arranged between the left anchoring piece and the right anchoring piece; a steering gear is arranged on the anchor cable; each anchoring piece comprises a base plate, connection plate fixedly arranged on the base plate and an ear plate fixedly arranged on the connection plate; a half-round groove is arranged at one end of the connection plate; and a baffle is arranged on a pin hole. The strengthening method provided by the invention comprises the following steps of: anchoring piece processing, bridge body polishing, installing, glue pouring and tensioning. The device and the method which are provided by the invention have the advantages that: the installation process is simple and rapid; the traffic needs not to be interrupted during installation; the construction period of installing the device provided by the invention is short; and the volume of the device is small and the device is flexible to ensure that the requirements for rapid strengthening construction can be satisfied.

Description

technical field [0001] The invention relates to an external prestressed anchoring device and a rapid reinforcement method for a concrete bridge. Background technique [0002] At present, the concrete bridges in our country that have been in operation for many years have suffered from various damages. The bridge damage has accumulated continuously, and the bearing capacity has declined. The rapid development of existing transportation has made the original design bearing capacity of the bridge unable to meet the growing transportation needs. Therefore, without interrupting traffic It is very urgent to quickly strengthen the concrete bridge under the premise of the above conditions; domestic and foreign studies have shown that using external prestressing to strengthen the concrete bridge can restore and improve the bearing capacity of the bridge. [0003] Existing external prestressing reinforcement methods mostly use anchors to anchor the prestressed external cables on the br...

AI Technical Summary

Problems solved by technology

In the field of external prestressed bridge reinforcement, concrete anchor blocks are usually planted on existing beams. The disadvantages of this anchor method are: complex construction technology, long construction period, large and heavy volume, and cannot meet the requirements of rapid reinforcement construction; Shear failure is prone to occur between the concrete anchor block and the original bridge concrete interface; the difference in performance between the old and new concrete can easily cause shrinkage and creep cracks

[0006] Although most of the existing steel anchoring devices can be flexible, light, and easy to install quickly, most of the anchoring devices are connected to the bridge through organic adhesives, anchor bolts or high-strength expansion bolts, organic adhesive bonding, anchor bolts or high-strength expansion bolts The maximum load that the expansion bolt can bear is limited, and the external prestress provided is small. It is suitable for the restoration of the bearing capacity of existing bridges, and is not suitable for the reinforcement of bridges that have higher requirements for bearing capacity.

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