City viaduct prestress hollow slab end web inclined crack damage treatment technique

Abstract

The invention belongs to the technical field of bridge construction, and particularly relates to a city viaduct prestress hollow slab end web inclined crack damage treatment technique. According to the technique, the ends of a hollow slab are filled with slurry, the section areas of the ends of the prestress hollow slab are increased, the shear-resistant section area of concrete can be directly increased, bearing capacity is improved, inclined cracks of the ends of the hollow slab can be safely and rapidly treated, steps are simple, operability is high, land is saved, and economic benefits andsocial benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a technology for treating oblique cracks in the end webs of prestressed hollow slabs in urban viaducts. Background technique [0002] Prestressed hollow slabs are widely used in engineering because of their light weight, mature manufacturing process, low cost, and convenient installation. At the same time, cracks and diseases of hollow slabs are common. Cracks, web oblique cracks, etc. Among them, the web oblique crack at the end of the hollow slab is a disease related to the safety of the structure, and the oblique crack at the beam end is caused by the insufficient shear resistance of the beam end of the hollow slab. [0003] A comprehensive analysis of the reasons for the oblique cracks in the end webs of prestressed hollow slabs on urban viaducts mainly includes the following three aspects: (1) Overload effects: urban viaducts with a running time of mo...

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Problems solved by technology

[0003] A comprehensive analysis of the reasons for the oblique cracks in the end webs of prestressed hollow slabs on urban viaducts mainly includes the following three aspects: (1) Overload effects: urban viaducts with a running time of more than 20 years, with the increase of urban traffic volume, Illegal traffic of overloaded vehicles is particularly serious damage to elevated roads; (2) Structural factors: pretensioned hollow slab structure is a structural form widely used in my country in the 1990s. One of the characteristics of this type of structure is that it is pretensioned. There is no bending of the stress tendon at the end, and the shear resistance is mainly borne by the stirrups at the end and the concrete web. This structural form is weak in shear resistance, especially the functions of the outer side plate and the anti-collision guardrail are all concentrated on the outside (3) Construction quality: According to the test results, the strength of the concrete meets the original design requirements, but engineering practice shows that the construction method causes large variability in the structure size; There is a failure section at the end of the stress, and when the prestressed tendons are cut off at the end, a large impact force will be generated on the end concrete, which will adversely affect the quality of the end concrete

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