Construction method of bonded prestressed structure for reinforcing hollow slab bridge

Abstract

The invention discloses a construction method of a bonded prestressed structure for reinforcing a hollow slab bridge. The anchoring toothed plate is mounted at the bottom of the hollow slab by the bonding prestressed structure; three steel strands of phi j8.6 are installed and tensioned; shear bars are arranged and a steel wire mesh is installed at the bottom of the plate; and high-strength tensile mortar is jetted in batches in the areas of the prestressed tendons and the toothed plate. The bonded prestressed structure for reinforcing the hollow slab bridge is convenient and rapid to construct, and through the prestressed steel strand and the tensile mortar applied to the bottom of the hollow slab, the bearing capacity of the hollow slab can be effectively improved, the section height is increased, the structural rigidity is improved, and the structural durability is remarkably improved; compared with a traditional prestress reinforcing method, under the condition that the bearing capacity is improved at the same level, the structure is simple, the self weight is light, the structure size of newly-added concrete can be reduced, the increased self weight of the hollow slab is reduced, and the prestress reinforcing effect is improved.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, in particular to a construction method for a bonded prestressed structure used for strengthening a hollow slab bridge. Background technique [0002] Bonded prestressed reinforcement technology uses small-diameter prestressed steel strands anchored on the beam to be reinforced to apply prestress to the beam body, and then injects high-strength tensile mortar to form a bonded prestressed reinforced structure. Add prestressed tendons at the bottom of the hollow slab, the number of which is determined by the force requirements, and the length of the prestressed tendons is determined according to the requirements for the bending capacity of each section of the beam body; Tensile mortar, the prestressed tendon and the web are bonded together to form a bonded prestressed reinforcement structure. [0003] At present, the commonly used reinforcement methods for bridge hollow slabs are: ① reinf...

AI Technical Summary

Problems solved by technology

However, method ① is easy to age and crack the steel plate, which will cause the steel plate to fall off, and the steel plate needs to be treated with anticorrosion regularly in the later stage; method ② obviously increases the self-weight and size of the original structure, which is not necessarily beneficial to the force of the structure and will reduce the height under the bridge, affecting the bridge method ③ belongs to passive reinforcement, and pasting carbon fiber cloth cannot improve the structural rigidity of the hollow slab; method ④ can effectively improve the structural bearing capacity, but has no effect on the structural rigidity; method ⑤ construction is time-consuming and laborious, and requires a long closed bridge Time, great impact on driving, poor economy

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