Beam end prestress structure and construction method thereof

Abstract

The invention discloses a beam end prestress structure. The structure comprises a box girder, a T-beam structure, bridge piers and prestressed steel beams, the adjacent spans of the box girders form the T-beam structure; the junction of the box girder and the T-beam structure of each adjacent span is positioned on the bridge pier; multiple T beams are connected in the width direction of the bridgeat the beam ends through end cross beams, the multiple prestressed steel beams are arranged in the box girder, anchoring points at the two ends of each prestressed steel beam are located in the end cross beam areas of the T beams of the adjacent spans in the width direction of the bridge, and the prestressed steel beams are parallel to the vertical plane where the axis of the bridge is located. The prestress steel beams of the box girder are tensioned at two ends, so that prestress loss can be reduced, the prestress steel beams can be stressed uniformly, and safety is guaranteed. The tensioning space of the prestress is arranged in the end cross beam area range of the T beam structure, so that tensioning of the box girder prestress has sufficient space without influencing the erection ofa T beam rib, the construction period is effectively shortened, and the work efficiency is improved.

Description

technical field [0001] The invention relates to the field of road and bridge design and construction, in particular to a beam end prestressed structure and a construction method thereof. Background technique [0002] Box girder is a kind of middle beam in bridge engineering. It is hollow inside and has flange plates on both sides of the upper part. It is named for its similarity to a box. T-beam refers to a beam with a T-shaped cross-section. It is composed of horizontal flange plates and vertical beam ribs. Several T-beams are connected by end beams at the beam ends. For bridges composed of cast-in-situ box girders and prefabricated T girders, the current domestic prestressed beam distribution design scheme is that the longitudinal prestressed steel tendons in the box girder need to be anchored and stretched at the joint ends, and are affected by the prefabricated T girder ribs and end beams. The current commonly used tensioning methods are: 1. The longitudinal prestressed...

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Problems solved by technology

The disadvantages of these methods are: the loss of prestress in method 1 single-end tension is large, and when the height of the box girder is small, the tension in the box room is also relatively difficult, and the construction quality of prestress is difficult to guarantee; method 2 prefabricated T-beam The erection must be carried out after the prestressed steel tendons of the box girder are stretched. The construction efficiency is low, the construction period is long, and it is difficult to meet the production requirements; method 3. The notches on the top plate of the box girder will cause a large amount of lateral force on the top plate of the end beam of the box girder The main rib was cut off, leaving a safety hazard

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