Inverse calibration correction method for positioning precision of immersed tube installation measuring tower

Abstract

The invention belongs to the technical field of engineering measurement, and particularly relates to an inverse calibration correction method for positioning precision of an immersed tube installation measuring tower. The inverse calibration correction method comprises the steps of measurement and control system calibration, positioning precision correction and the like. The calibration of the measurement and control system further comprises initial calibration of a pipe joint and initial calibration of a measurement tower; the positioning precision correction further comprises construction coordinate system establishment, data processing, precision comparison and correction. According to the method, a GNSS receiver is erected on the pipe top feature points to collect the coordinates in real time and compare the coordinates with the real-time calculation result of the measurement tower measurement and control system, calibration error correction is carried out on the measurement tower before the pipe joint is immersed, the reliability of the calibration precision of the measurement tower is improved, and the installation precision of the immersed pipe is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of engineering measurement, and in particular relates to a reverse calibration correction method for positioning accuracy of an immersed tube installation measuring tower. Background technique [0002] In recent years, with the development of society, large-scale immersed tube tunnels for cross-sea passages have emerged continuously. The construction scale of immersed tube tunnels has become larger and larger, the volume of immersed tubes has also increased, and the requirements for installation accuracy have become higher and higher. The immersed tube installation measurement tower method is a modern measurement method that combines GNSS measurement with underwater measurement and positioning technology. It has the characteristics of high precision, high reliability, and simple operation. It is widely used in the construction of tunnels and Nanchang Honggu Tunnel. [0003] However, during the sinking and d...

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Problems solved by technology

[0003] However, during the sinking and docking process of immersed tubes and pipe joints, the calibration of the measurement tower is affected by natural environmental factors such as wind, waves and currents, and it becomes more difficult to control the calibration accuracy error of the measurement and control system. It will lead to the decline of construction quality, and even lead to the failure of immersed tube installation, which will increase the project cost and prolong the construction period, and become a major risk point of the project

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