FIELD: geodesy, determination of geometric parameters of metal casing tubes mounted in process of bridge construction. SUBSTANCE: plumb bob-magnet suspended by flexible thin wire is lowered into tube to corresponding depth to test verticality of casing tube. Upper end of wire is moved along geodetic rod towards edge of tube. Reading is taken by rod at moment of sticking of plumb bob-magnet to tube. Series of measurements at various depths in two mutually perpendicular directions is obtained. Value of deviation from vertical line, its direction and values of bending of casing tube are calculated by measurement results. Method provides for precision of 30.0 mm that satisfies allowance for testing of execution of mounting operations. EFFECT: improved precision of method. 1 dwg
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