The trends of modern society require a quick solution to the issues of restoration of emergency buildings and structures. New methods of strengthening the load-bearing structures of buildings are aimed at reducing labor costs, the timing of work and the need for complex equipment. In the field of reinforcement of reinforced concrete structures, such methods are composite reinforcement systems. Having proven itself well in working with bendable and compressed elements, there are areas where their use has not yet been studied. One of these is the reinforcement of reinforced concrete girderless floors, in which the protective layer of concrete is broken. This article is devoted to the development of a method of reinforcement with composite materials, where the protective layer of concrete was violated. At the same time, the internal moment of a pair of forces reduces the bearing capacity of the element by about 30%. The paper presents the advantages of the new composite reinforcement method and provides a possible example of its use on a real object.

Keywords: concrete, reinforced concrete, composite material, carbon fiber, carbon fiber lamellas, carbon laminate, flexibility, compressed elements, girderless overlap

Reinforced concrete structures with prestressed reinforcement are a problem when it is necessary to restore or strengthen them, especially when the prestressed reinforcement is damaged or has significant corrosion. Typically, such structures have large dimensions or cover large spans. Given the scale of work to replace such structures, the development of options for strengthening or restoration is an urgent issue. One of the most complex structures with prestressed reinforcement is a high-rise power line support with an annular section. Its work in the natural environment is exposed to destructive factors that lead to the removal and destruction of prestressed reinforcement. This article is devoted to the development of a method for strengthening the damaged section of the reinforced concrete pylon of a power transmission line by replacing and prestressing the destroyed rod. The paper presents the technology of the amplification method and the main positive properties.

Keywords: heavy concrete, power transmission line support, reinforced concrete, compressed elements, threaded coupling, reinforcement