FIELD: construction.
SUBSTANCE: analysis of bridge design and regulatory documents is performed, stability, durability criteria are established, as well as their permissible values. A grid of connected basic points of cone and abutment structure is chosen, accuracy of their coordinates detection is calibrated relative to geodetic control. Further using three GPS-receivers and a laser scanner, coordinate and space control of cones and abutments is performed, horizontal and vertical angles and distances are determined to each specified point of structural elements, which define a general contour of the structure and features of its component geometry. Using a georadar they perform detailed instrumental examination of an embankment coupled with bridge abutments for availability of internal erosion of soil within its volume. Actual parameters and characteristics of structure element materials are determined, as well as actual parameters of the soil base state and characteristics, actual values of parameters of damages, defects and links in individual components of structural elements are defined. On the basis of this data they build a multi-parameter digital model of cones and abutments and schemes of their loading with spans and a rolling stock travelling on the bridge. Afterwards using a method of calculation they define technical condition and stability parameters of cones, abutments and resting spans, and produced values are compared with permissible values.
EFFECT: on the basis of comparison they establish suitability of cones, abutments and resting bridge spans for further safe passage of trains, there might be new damages and insufficiency of bearing capacity, justify necessary types and scopes of repair.
3 cl
