橋梁(1)

[VI-206] Consideration on application of GNSS to displacement measurement of cantilever erection method bridge

〇Tsuyoshi Kitahara¹, Kazuyoshi Kasakura¹, Keisuke Iwanami², Ayumi Iida² (1.Taisei Coporation, 2.SAKATA DENKI Co.,Ltd.)

Keywords:Global Navigation Satellite System, Bridge displacement measurement, Camber control, Kalman filter, Noise ratio

In the construction of a prestressed concrete bridge by cantilever erection method, camber control is performed as finish form management, and the bridge displacement is performed by level survey in the early morning when the difference of temperature is small between the top and bottom surface of girder. Therefore, we verified whether unmanned measurement by GNSS can be applied to camber control in the site.
As a result, the GNSS observation values could be applied to the camber control by appropriately setting the parameters used in the Kalman filter(Noise ratio) to correct the dispersion error of the GNSS observation values at the timing of each cantilever construction.