Prestress Bailey beam for reinforcement and construction method thereof

Abstract

The invention discloses a prestress Bailey beam for reinforcement and a construction method thereof. The Bailey beam is composed of Bailey sheets, reinforcing rods, bolts, anchoring bolts, prestress bunches and anchoring tools. Each component of the Bailey beam is prefabricated in a factory and then assembled and hoisted on site; the prestress bunches are placed in lower chords of a Bailey beam body and fixedly anchored on the reinforcing rods at both ends. The Bailey beam can slide towards the two ends in a prestress expansion process and are integrally lifted up; meanwhile, a pre-pressure isperformed on the lower brim to achieve the functions of reversely arching the structure, closing cracks and reducing downward warping; after expansion is completed, by fixing filling pieces, sealingsteel plates and injecting solidified bodies for sealing, the prestress bunches and the Bailey beam body form a whole part to bear force, and not only is the waste of the prestress reduced, but also the durability of the prestress bunches is improved. The Bailey beam carries out power transmission based on the lever principle, and the advantages of the Bailey beam and external prestress are fullyutilized; through assembled-type construction, splicing is simple, the construction period is short, there is no need to interrupt the traffic, and the prestress Bailey beam and the construction method thereof can be widely applied to the field of concrete structure reinforcement.

Description

technical field [0001] The invention relates to the field of bridge and building structure reinforcement, in particular to a prestressed Bailey beam for reinforcement and a construction method thereof. Background technique [0002] Since the reform and opening up, along with the rapid development of my country's economy, the construction of public infrastructure has developed rapidly. Especially since the 1990s, the country has invested heavily in high-grade highways, which has made my country's bridge construction develop vigorously. The number of bridges The number of bridges has increased sharply, and the vast majority of bridges are concrete structures. However, due to the erosion of harmful substances in the external environment, concrete aging, cracking, defects in design and construction, changes in use functions, overloading, and improvement of design standards, the existing concrete structures have insufficient bearing capacity and stiffness during the service period...

AI Technical Summary

Problems solved by technology

Enlarging the cross-section reinforcement method will greatly increase the cross-sectional area and self-weight of the structure, the construction process is complicated, and the construction period is long; the reinforcement method of sticking steel and pasting fiber composite materials can improve the bearing capacity of the structure by pasting steel plates or fiber composite materials on the surface of the structure. However, due to the limitations of adhesive materials and technological level, steel plates and fiber composite materials are easy to peel off and have poor durability; while the external prestressed reinforcement method may lead to local cracking of the concrete structure, and its construction process is relatively complicated

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