METHOD DETERMINING TILTING Russian patent published in 1999 - IPC

FIELD: geodetic measurements, determination of tilting of cylindrical structures. SUBSTANCE: in correspondence with method tilting is determined by difference of vertical angles measured by theodolite installed at point of laying out network between pairs of marked points on surface of cylindrical jacket. Design difference of vertical angles for corresponding pairs of marked points is computed in advance. Eight marked points are used to determine tilting and one pair of points matches longitudinal axis of structure. Tilting components are obtained by measured differences of vertical angles: as well as value of tilting K= , where K is elevation expression of tilting; K_x is longitudinal component of tilting; K_y is lateral component of tilting; L_i is computed distance from point of laying out network to nearest marked point; L_k is computed distance to remote marked point; Δν_meas is measured difference of vertical angles ahead of corresponding pair of marked points; Δν_adv is computed difference of vertical angles for corresponding pair of marked points. Values L and Δν_adv are computed by design coordinates and by marks of marked points and point of laying out network. Determination of value of elevation expression of tilting makes it possible both detect and timely correct tilting of cylindrical jackets during mounting. EFFECT: increased operational productivity when determining tilting of cylindrical jackets. 1 cl, 4 dwg