The connection of rebar of concrete structures by looping rebars with the formation of the joint core was developed at the beginning of the last century, but it has not been actively used due to the complexity of the work and the lack of calculation methods. The article presents a review of the history of the creation, practical application, national and foreign scientific research of the loop joints of rebar in concrete structures. The article describes advantages and disadvantages of such joints, gives brief information about the main parameters of the joints and the principle of operation. Suggestions for the directions of further study of the looped joints of reinforcing bars operation are presented, the goals for full-scale and numerical experimental research aimed at the development of calculation and design methods of looped joints for their further wider introduction into the construction practice are set.

The article describes the design features of the Ostankino TV tower in Moscow. The main results of the earlier works of the load-bearing reinforced concrete structures of the TV tower column and foundations are presented in the article. The authors examined the internal and external surfaces of reinforced concrete structures of the entire height of the tower with selective defectoscopy and determined the actual strength of concrete by non-destructive methods. The figures of this work show the main structural reinforced concrete elements and a distribution graph of strength characteristics of the height of the structure. Despite the noticeable height changes, the concrete strength in all parts exceeds the value provided for in the project.