Novel external prestressing strengthening device and construction method thereof

Abstract

The invention discloses a novel external prestressing strengthening device. The novel external prestressing strengthening device comprises a prestressing strengthening piece anchored to the periphery of a concrete bridge disease area. The strengthening piece is composed of a plurality of prestressing units. Each prestressing unit comprises two sets of anchoring blocks which are symmetrically arranged left and right in a spaced mode and are provided with prestressing bundle hole channels. The connecting lines between every two sets of anchoring blocks are of a rectangular structure. A unit prestressing bundle is arranged between each set of anchoring blocks. The two ends of the unit prestressing bundles penetrate out from the interiors of the prestressing bundle hole channels in the anchoring blocks and are fixed. Arc-shaped positioning groove plates are clamped to the middles of every two unit prestressing bundles correspondingly. An adjusting threaded rod is arranged between every two arc-shaped positioning groove plates in a penetrating mode. Adjusting nuts are screwed in the positions, stretching out of every two arc-shaped positioning groove plates, of each adjusting threaded rod. According to the novel external prestressing strengthening device and a construction method, a unified disposal scheme for solving a plurality of fracture shapes is provided, the multiple prestressing units can be arranged on a single section in the longitudinal, vertical or transverse direction, and two-way or three-way prestress can be applied to a box beam.

Description

technical field [0001] The invention relates to the reinforcement technology of highways and municipal bridges, in particular to a new type of external prestressing reinforcement device used to solve vertical, lateral and oblique cracks in concrete box beams, and the invention also relates to using the reinforcement device to reinforce concrete boxes Construction methods for beam cracks. Background technique [0002] According to the investigation on the disease of highway prestressed concrete box girder, from the general trend, the box girder with span greater than 60m is prone to cracking phenomenon. Different bridges only have different crack properties, crack locations and severity. The cracks on the concrete box girder rarely have a single crack shape, and usually multiple crack shapes coexist. When these cracks develop to a certain extent, the bridge will not be able to meet the requirements of use, and it needs to be reinforced in time to restore its function. [00...

AI Technical Summary

Problems solved by technology

In this method, the prestressed steel bar is welded to the steel plate pre-anchored on the beam. The welding point is prone to fatigue during the operation of the bridge and leads to failure, so that the prestress applied to the beam body is lost.

[0005] (2) Prestressed steel bars are not easy to replace

[0006] (3) Large prestress cannot be applied

[0007] (4) Only suitable for solving the problem of plane cracks

This method is mainly used for the treatment of vertical cracks in the web, and it is difficult to deal with the vertical cracks in the web and the longitudinal cracks in the roof at the same time

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