Study On Reinforcement Technology Of Highway Bridge Structure Underwater

Because of moving and environment loads, concrete structure diseases of bridge underwater are often severe and difficult to be found, while the traditional strengthening technology of high cost, high impact. In view of this, taking the undrained consolidation as the guiding ideology, we carry out a study of strengthening technology of concrete structures underwate.Taking advantage of specimens with prefabricated cracks, we repair concrete cracks underwater, mechanical test results show that failure mode of the reinfoced specimens belongs to cohesional failure, their ultimate load exceed 5.79% of the comparison specimens;Taking advantage of specimens with prefabricated flaws, we repair them with multi-function adhesive, mechanical test results show that the compressive strength of the reinfoced specimens exceed 16.8% of the comparison specimens; We planted bars on concrete specimens underwater, tensile strength test results show that all embedded bars were pulled out, so influence on ultimate load and bond strength were analysed;We pouring the standerd concrete specimens for testing their compressive strength underwater, mechanical test results show that strength of non-dipersible concret specimens made underwater can reach 82% of that on the land, it can meet the demand of construction underwater.Through the study of reinforcement technology of concrete structure underwater with curved surface fiber grid, we made curved surface grid products required for small size special-shaped components in laboratory, and then summed up the relevant manufacturing technology. Material test results show that the mechanical properties are relatively stable, and the products can meet the demand of strengthening construction. At the same time, we reinforce concrete structure underwater with space grid products and non-dispersive mortar, summary related technology, mechanical test results of specimen show the effectiveness, and improve the bearing capacity of underwater concrete structure, the calculation formulas based on the experimental results were put foward.Through research on the technology of bridge structure reinforcement under water with FRP- steel composite pipe, we put forward the technology of reinforcement, in which the key process of reverse point settings were studied, and the design method of anti-point was gien; through the study of pipe-soil interaction, we analyze the vertical bearing capacity of composite pipe, at the same time, simulation of composite pipe penetration with finite element software was done. Comparing different pipe diameter, wall thickness, the friction coefficient, we analyze the change of static pressure, accordingly, we give relevant suggestions for static pressure construction.