ANALYSIS OF THE CONDITION AND RECONSTRUCTION EFFICIENCY OF BRIDGES IN THE RECLAMATION STRUCTURES INVENTORY OF ROKIŠKIS DISTRICT

Abstract

Most of the bridges in the reclamation systems of the territory of the Republic of Lithuania were built in the last century, Rokiškis district is no exception, the year of construction of the bridges in the records of reclamation structures ranges from 1960 to 1989. Due to insufficient funding for the maintenance of reclamation systems, the technical condition of bridges is deteriorating every year, so it is not surprising that in recent years we hear more and more about various bridge collapses. In order to reduce the number of disasters related to bridge collapses, technical maintenance must be carried out annually and repair or reconstruction works must be carried out at the appropriate time.

In order to determine the state of the bridges in the Rokiškis district reclamation structures and to assess the efficiency of the reconstruction works, was assessed the technical condition of 55 bridges and was determined the concrete compressive strength of 11 bridge structures. During the visual inspections, were determined the parameters of the bridges, was assessed the condition of the reinforced concrete structures, and were fixed defects and gaps in the surface structures of the bridge. The most common defects and gaps are cracks of the protective concrete layer, cracks in the concrete, corrosion of reinforcement, gaps between bridge overlay panels and piles, lack of bridge railings, deformations and metal corrosion. After evaluating the compressive strength of concrete, it was found that 83,3% of the studied structures did not meet the requirements set for them.