Elevation measurement method for long-span suspension bridge

Abstract

The application discloses a large-span suspension bridge elevation measurement method, and relates to the technical field of bridge construction. The large-span suspension bridge elevation measurement method comprises the following steps: obtaining an elevation control network point, a gravity anomaly correction number and a normal leveling surface non-parallel correction number; establishing an absolute elevation reference network at a road surface connection position between a bridge and an adjacent structure on both sides of a suspension bridge according to the elevation control network point, the gravity anomaly correction number and the normal leveling surface non-parallel correction number; and measuring relative geometric elevations and adjusted absolute elevations of each component of the suspension bridge by using a measuring instrument according to the absolute elevation reference network. The relative geometric elevations and the adjusted absolute elevations of each component of the suspension bridge are measured by establishing the absolute elevation reference network and using the measuring instrument, the influence of gravity anomalies in high-altitude and deep valley areas is overcome, the unification of elevation references on both sides of the large-span suspension bridge is ensured, and the elevations of anchorages, a main beam, a top column of an upper tower, a main cable saddle, main cables and the like of the suspension bridge are kept consistent with the design theoretical elevations.

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