Research of the bridge structure by impact-echo method

Abstract

This article reflects the results of studies of the operated bridge on the river Mozdernyak in the municipality of Kneginek (Croatia), which was subject to expert analysis of the needs of reconstruction.

In the process of field research of the structures of the considered bridge, the Impact-Echo method was used and at the same time the peculiarities of the method of this method were investigated. In particular, on the basis of the Impact-Echo method, the construction of the old part of the studied bridge was checked, as well as the connection of this old part with the new part of the bridge was checked.

Also, studies on the example of the construction of this bridge found that the acoustic properties of the wall components (brick, block and mortar) are quite similar, that in most cases masonry building elements respond to Echo-Impact as a solid block and this should be taken into account. This method allows you to detect cavities in several walls and assess their scale and impact on the strength of structures.

The use of research equipment provided by the Impact-Echo method allowed to investigate the deposition of concrete in the lower and upper reinforcing zones of the bridge, as well as to determine the existing boundary between the layer of concrete and asphalt.

Thus, the results of the research presented in the article allow to improve the methodology of research of bridge structures by the Impact-Echo method. In addition, expert opinions were made on the condition and prospects of operation of the bridge considered in this article - the bridge structure is in a satisfactory condition, which allows its operation. However, after some time it is recommended to repeat the research of the bridge using the method of the Beat-Echo method, with the continuation of the research areas to a new section of the bridge.