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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position :Home->Past Journals Catalog->2022 Vol.1

    Method to eliminate the influence of earth curvature on the elevation of super-large jacket
    Author of the article:ZHANG Shijian, YANG Qingfeng, YANG Xianyang, LIU Chunjie, SONG Guohui, LI Xiaohong, QIN Ye, WANG Zhi
    Author's Workplace:China Offshore Oil Engineering Co., Ltd., Tianjin, 300452, China
    Key Words:Curvature of the earth; Super-large jacket; Free station; Three-dimensional coordinate transformation; Coordinate control network
    Abstract:

    The super-large jacket is huge in size and the coordinate control network is more widely distributed. When using the traditional coordinate control network to measure the height of super-large jacket, the curvature of the earth will cause large error in elevation as the fabrication of the tall jacket is done while lying horizontally on the ground. As a result, the dimensional accuracy of the fabricated super-large jacket cannot be guaranteed. In the view of the fact that traditional jacket control network cannot effectively eliminate the error caused by the curvature of the earth, a three-dimensional coordinate transformation method based on a one-stop coordinate control network is proposed. A high precision total station is used to measure all station coordinates in one position. During the horizontal construction of the jacket, the measured points are converted into a one-stop coordinate system by the transformation of the three-dimensional coordinates of the station. So it can effectively eliminate the jacket elevation error caused by earth curvature. The experimental results show that the elevation measurement value is basically the same using the three-dimensional coordinate transformation method based on one-stop coordinate control network no matter where the total station is erected. Hence this approach can eliminate the error caused by the curvature of earth, which is of great significance to accurately control the dimension of super large jacket.

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