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- W858077829 abstract "In the construction of a huge bridge, a caisson for a pier construction must be set very accurately at a predetermined position in the water. The authors applied real-time kinematic GPS (RTK-GPS) positioning to the immersion of a caisson in the construction of Ohshima Great Bridge. The caisson was transported and set in place with a floating crane. On the caisson were installed two GPS antenna in order to measure the position and the attitude. They were at the corners opposite to the operating crane vessel so as to minimize interference by the booms of the crane. The reference station was set on the land 370 m away from the site. The position and the attitude were displayed for the crane operator in the vessel. The position, measured after the setting, had the averaged horizontal error of 5 mm with the standard deviation of 20 mm, in reference to the position measured simultaneously by a conventional optical surveying instrument, so-called ‘Total Station’. Thus we conclude that the present RTK-GPS positioning is accurate enough to fulfill a required setting allowance of ± 10 cm. At construction sites we usually have many obstacles such as the booms of a crane which often interfere signals from satellites. We can infer which satellites are interfered from the discrepancy between the covariance ellipse deduced from the satellites’ constellation and that deduced from actually measured positions." @default.
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- W858077829 date "1997-01-01" @default.
- W858077829 modified "2023-09-23" @default.
- W858077829 title "Application of RTK-GPS to Immersion of Caisson" @default.
- W858077829 cites W2023239366 @default.
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- W858077829 doi "https://doi.org/10.1007/978-3-662-03482-8_93" @default.
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