METHOD OF QUALITY INSPECTION OF CONSTRUCTION STRUCTURES Russian patent published in 1998 - IPC

FIELD: civil engineering. SUBSTANCE: proposed method refers to nondestructive test and diagnostics of construction structure, linings and facings of hydrotechnical tunnels. Method consists in excitation and registration of elastic vibrations on surface of tested structure, in their amplification and conversion to digital code, in recording of information on medium, in measurement of parameters of received vibrations and in determination of quality of structure. Registration of excited vibrations is performed with the aid of network of reception points arranged on surface of structure which transmitters of vibrations generate electric signals proportional to rate of displacement of surface of structure. Initial approximation of defect model is formed by collection of obtained information that is consistently improved till specified accuracy is achieved by comparison of generated parameters with model ones. Initial approximation of model is formed on basis of structure of parameters of signal by method of cluster analysis both in absence and in presence of reference point obtained by drilling data or by any other method. Input of corrections to initial model is carried out by change of relation of characteristic values of initial model, for instance sides of rectangle, semi-axes of ellipse. Besides input of corrections to initial model is performed by addition of single element, for example of square shape, to initial outline and by its movement along outline. EFFECT: detection of free spaces, breaks of contact " concrete-rock ", restoration of form of free spaces behind linings, outlining of defects behind surfacing of construction structure. 2 dwg