Large-curvature immersed tube one-time calibration method in high and cold environment

Abstract

The invention relates to a one-time calibration method for a large-curvature immersed tube in a high and cold environment. The one-time calibration method comprises the following steps that control points are arranged, wherein a plurality of control points are arranged on the outer surface of the top of the immersed tube and near the immersed tube; establishing coordinate systems: establishing a horizontal coordinate system and a vertical coordinate system; measuring coordinates of the control points: measuring horizontal coordinates and elevations of the control points by utilizing the position relationship among the control points; feature points are selected from the end faces of the head end and the tail end of the immersed tube, the interior of a middle gallery of the immersed tube and the outer surface of the top of the immersed tube; and immersed tube feature point calibration: performing feature point calibration by using the control point coordinates obtained by measurement to obtain three-dimensional coordinates of each feature point so as to obtain a relative position relationship of each feature point. According to the method provided by the invention, calibration can be completed outside the immersed tube, the calibration precision is improved, and the calibration integrity is ensured.

Description

technical field [0001] The invention belongs to the technical field of calibration and measurement of immersed tubes, in particular to a one-time calibration method for immersed tubes with large curvature in alpine environment. Background technique [0002] With the continuous development of immersed tube technology, the application range of immersed tubes is continuously expanding, and the requirements for the installation accuracy of immersed tubes are also getting higher and higher. During the installation and positioning process of the immersed tube, it is necessary to calibrate the immersed tube to achieve precise positioning and installation. [0003] There are two existing calibration methods: the first one needs to see through the middle corridor of the immersed tube. Specifically, the total station is set up at the head end and passes through the rear end prism of the middle corridor for calibration, but in the alpine region with large curvature It is difficult to ...

AI Technical Summary

Problems solved by technology

[0003] There are two existing calibration methods: the first one needs to see through the middle corridor of the immersed tube. Specifically, the total station is set up at the head end and passes through the rear end prism of the middle corridor for calibration, but in the alpine region with large curvature It is difficult to see from the end to the end of the radius immersed tube, and the temperature difference between the inside and outside of the immersed tube is very large, which may lead to an increase in the calibration error; Calibration at multiple stations makes it difficult to guarantee the integrity and accuracy of calibration

[0004] The immersed tube calibration method in the prior art cannot be applied to the calibration of the immersed tube with large curvature in the alpine environment, and the calibration accuracy cannot be guaranteed

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