Bridge bent cap reinforcing process

Abstract

The invention discloses a bridge cover beam reinforcement process. The process comprises the following steps: S10, preparation of newly reinforced concrete: weighing the following raw materials: cement, fly ash, gravel, sand, water, a water reducing agent, an expanding agent, cellulose fibers and steel fibers; s20, on-site reinforcement, specifically comprising the following steps: S21) erecting a supporting bracket; (S22) chiseling is conducted; (S23) steel bars are planted; (S24) a bottom die bracket is erected; (S25) a formwork is installed; (S26) pouring is conducted; and S27) mold removal and maintenance. According to the invention, the shrinkage compensation performance, the crack resistance and the like of the material, especially the mutual coordination with the homogeneity, and the design is optimized, so that the durability and the mechanical property of the reinforced concrete are improved and the homogeneity of the reinforced concrete is ensured; and a complete set of construction processes of on-site scabbling, bar planting, pouring and curing are combined, so that the cohesiveness, integrity and crack resistance of the reinforced concrete and the original concrete are ensured, and the reinforced concrete and the original concrete are cooperatively stressed, so that an excellent reinforcing effect is achieved.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a bridge cover beam reinforcement technology. Background technique [0002] Give full play to the compensatory shrinkage of the expansion agent on the cementitious material, the reinforcement, toughening and crack resistance of the steel fiber on the concrete, and the further use of the cellulose fiber to compare the effect of the steel fiber on the concrete performance, especially under pumping conditions. [0003] With the increase of the service life of bridges, the existing concrete structures have experienced serious aging and disease problems under the action of various service loads and erosive environments, which seriously affects the structural safety of bridges. Concrete structures in these conditions are often inconvenient for demolition and reconstruction due to economic and social reasons. They are usually repaired and reinforced when they are technically...

AI Technical Summary

Problems solved by technology

First, the treatment of the old concrete surface; second, the cracks caused by the shrinkage of the newly reinforced concrete lead to weak bonding; third, how to achieve the uniformity of the newly reinforced concrete in the production process, and its unevenness seriously affects the reinforcement effect , resulting in a weak surface, thus failing to achieve the reinforcement effect

[0005] In addition, the production and preparation of bridge reinforced concrete is also very critical. Compared with ordinary concrete, the performance requirements of reinforced concrete are particularly high, especially to overcome self-shrinkage, crack resistance, and bonding performance with old concrete. Different materials need to be added to control the relationship between concrete Performance, mainly in reinforced concrete due to the complexity of its components, so the complexity of the components On the one hand, it is necessary to disperse the various components evenly in order to effectively play the functions of various components. For example, cement is the component that directly provides the strength of concrete. Consider the heat of hydration when designing the mix ratio, and the cement mixing ratio may be optimized and reduced. If the dispersion is uneven, the local strength cannot meet the design requirements, and the verification will affect the quality of the reinforced concrete; the reinforced concrete needs to overcome the common concrete (cement plus fly ash combination Point) The problem of self-shrinkage of cementitious materials is to achieve the purpose of compensating shrinkage. If the expansion agent is not uniformly dispersed, it will cause inconsistent expansion in different positions of the concrete, which is often counterproductive and damages the concrete structure, so the uniform dispersion of the expansion agent is very important; The impact of the outer steel fiber on the uniformity of dispersion of the concrete will lead to the impact of the workability of the mixture and the impact of the pouring vibration. At the same time, it will also lead to the difference in the performance of the reinforced concrete material itself, greatly reducing the steel fiber reinforcement, toughening and cracking effect

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