FEATURES OF CONSTRUCTIVE, ORGANIZATIONAL AND TECHNOLOGICAL SOLUTIONS FOR THE RESTORATION OF REINFORCED CONCRETE BRIDGE STRUCTURES

Abstract

The article provides information on effective structural and organizational-technological solutions for surveying, designing and restoring the bridge structure, which was partially destroyed as a result of the armed aggression of the Russian Federation. It was established that information from scientific and regulatory sources does not sufficiently reflect the situation with bridges, where a part of the load-bearing structures has been completely lost and it is necessary to carry out work on the construction of new structures with the possible use of a part of the old (undamaged) ones. The current operating condition of the main elements of the structure (bridge web, span structure, supports and support parts, foundations, approaches) is determined. When predicting the term of accident-free operation, it was established that the remaining resource of the bridge, taking into account the actual technical condition of the main elements at the time of the inspection (destruction), which is determined from the equation of element degradation, is completely exhausted. The obtained data made it possible to predict the technical condition of the bridge in accordance with regulatory requirements and to prescribe operational and restoration measures. The use of undamaged underground structures for the construction of new reinforced concrete supports is substantiated, where preparatory work is provided with the use of complex mechanization tools. When concreting the bodies of the supports, the rationality of the new fastening of the braces of the formwork blocks was confirmed, which ensured increased rigidity and stability of the assembled formwork, for which it was proposed to install one plate between the supports on a rigid metal frame structure with a height of corresponds to the lower limit of the concreting massif, with the possibility of attaching braces working in different planes to it. It is proposed not to change the position of the two slabs intended for braces along the axis of the bridge, while they were also placed on similar metal frames. Placing the plates for fastening the braces at the mentioned height made it possible to reduce the length of the braces and ensure their working angles within the most effective limits.