Method of and apparatus for checking relative horizontal movements of suspension structures of suspended bridges during static loading tests

摘要

The invented method of and apparatus for checking relative horizontal movements of suspension structures of suspended bridges during static loading tests is characterized in that owing to a new combination of employment of currently available as well as low-price meters, even trained surveyors can make measurements of comparable level with uncertainties achieved by elite topographical surveyors using so far known methods wherein said combination is comprised of a kit of a water level with a laser radiator (4) provided with an adjustable clamping stand with a clamping surface (3) and a rectangular optical prism (5), a mechanical water level (6), a survey mark (10) with a graduated scale, a digital camera (12) and a compensation inclinometer (17). The resulting measurement value is determined as a sum of read-outs of a relative angular displacement of an element (2) on the surface of a bridge deck surface and a suspension structure (1) controlled by a shift of an image (11) of the laser beam on the survey mark (10) with the graduated scale and the read-out of a change in the bridge deck supporting element (2) incline controlled by the inclinometer (17) formed preferably by the mechanical water level (6) a micrometric screw (8) and an adjustable wedge-shaped insert (7).