TECHNICAL STATE AND RESIDUAL RESOURCE OF REINFORCED CONCRETE BRIDGES ON ROADS IN RIVNE

Abstract

The article considers the results of examination and diagnostics of the technical state of the reinforced concrete bridges. The purposes and tasks of examination, results of visual inspection, instrumental investigation, geodetic measurements and calculations of constructions of the artificial structures are stated. Their technical state and residual resource are estimated; the conclusions are made.

Works on examination and diagnostics of technical state of reinforced concrete bridges on roads in the city of Rivne were performed in October 2019 to order of the Housing and Communal Services Department of the Executive Committee of the Rivne City Council. Six bridges over the Ustya River and railway tracks were all exanimated. There was no design documentation for all bridges. The bridges were built between 1960 and 1985. The purpose of the examination is to determine the technical state and the possibility of further operation of the bridges. Type of artificial structures is beam. Groups of structural members of bridges such as bridge deck, supports, baulk structures, underbridge area, approaches were considered. The technical state of the bridge deck generally corresponds to state 4 - limited operable state. The technical state of the sidewalk blocks of all artificial structures corresponds to state 4, which is limited operable. Baulk structures, bridge supports have defects and damage that reduce their durability, safety and normal serviceability of structures. The technical state of baulk structures of bridges corresponds to states from 2 - in limited working state to 5 - nonoperable. Some baulks need repair and strengthening. The technical state of bridge support structures corresponds to state from 2 – in limited working state to 4 - limited operable. Certain support structures need to be repaired and strengthened. The technical state of the underbridge area of the structures corresponds to state 4 - limited operable state. According to the results of visual and instrumental inspection, as well as taking into account the identical effects and damage and the actual physical and mechanical characteristics of materials in the PC SCAD, calculations of load-bearing structures of bridges in the design state were made. The final assessment of the technical state of the bridges was carried out by two indicators, namely: by the lowest of the indicators of operational state and by a formalized rating assessment.