Study On The Subgrade Diseases In Great Span Prestressed Concrete Continual Rigid Frame Durability Research And Life Forecast

The abstract present paper summarized the influence concrete structure durable primary factor, and elaborated the concrete structure durability appraisal and the life forecast method, the content and the concrete durability research present situation and the theory knowledge. Gong Jiayuan the bridge as depends on the project take the Shaanxi Huangling to the Yenan highway Luo river Sichuan section east, the determination influence prestressed concrete continual rigid frame bridge durable primary factor and the life forecast evaluation model.The present paper through the scene gathering data including to in the environment principal constituent as well as the content analysis, simultaneously the scene drill hole takes the core to the concrete carbonization depth as well as the scene to make the chloride ion content, the chloride ion depth of penetration and the steel bar corrosion experiment in the laboratory, obtains the data. Through carries on the comprehensive scene inspection to the structure, considered the bridge structure lasting quality degenerates influence, determination structure in service life whether satisfied security, serviceability and durable request, thus the establishment durability initial parameter file, and carries on the concrete structure durability forecast. The result indicated the influence concrete structure durable factor are many, also which influence factor couldn't determine to the structure destruction main function. Because the concrete life forecast model is not very perfect, also is only the fuzzy computation, is to the structure life one kind of scientific forecast, how load can't calculate the structure concrete service life accurately and can withstand. Because causes the reason existence and the structural design, the construction and service maintenance each link which the structure durability expires, has very many elements of certainty very to be also big to the structure durable influence, like surpasses in the design scope the earthquake, the flood, the mountain massif landslide, the mud-rock flow and so on the natural disaster. Therefore the suggestion overall evaluation influence concrete structure durable each factor, synthesizes the influence structure durability primary factor forecast model the forecast structure the finally service life. The present paper through to affects the great span pre-stressed continual rigid frame durable factor analysis and the use structure evaluation model carries on the forecast to the structure life, is advantageous in further understood to the concrete material and the structure, has laid the foundation to the next new shape building material and the structure development, simultaneously proposed how enhances the concrete structure durable several suggestions.