High-precision determination method of three-dimensional coordinates of pile top surface center based on point cloud data

Abstract

A high-precision method for determining the three-dimensional coordinates of the top surface of a pile based on point cloud data. The method obtains the point cloud data of the top surface of the pile through remote sensing measurement, and then adopts the center method to solve and locate the center of the top surface of the pile. Then use the previously obtained coordinates, change the radius r, and find the sounding points whose radius from the initial center of the circle satisfies the following formula, and finally obtain the sounding points, construct the following equation to obtain the final coordinates of the center of the top surface of the pile. This method can be used for high-precision determination of the three-dimensional coordinates of the center of the top surface of the underwater pile, and solves the positioning of the top surface of the pile and the installation of offshore wind power racks. Compared with the traditional positioning method, it has high precision, high efficiency, low cost, and low cost. Advantages such as low risk and easy implementation.

Description

technical field [0001] The invention relates to the technical field of remote measurement and positioning of underwater pile bodies, in particular to a method for determining the three-dimensional coordinates of the center of the top surface of the pile body with high precision based on point cloud data. Background technique [0002] In the construction of marine engineering such as offshore wind power and offshore bridges, it is first necessary to drive piles into the seabed to form a foundational engineering support structure. In deeper waters, two sections of piles must be connected underwater for pile casing; The accuracy of the position is directly related to the implementation of the project and its safety. The underwater pile construction site is far away from the land, and the water depth value on the top surface of the pile body is still relatively large. Most of the pile body is buried by seawater, and it is difficult to determine its position by conventional optic...

AI Technical Summary

Problems solved by technology

[0005] First, the accuracy is low. The current ultra-short baseline positioning system has a short baseline, and the positioning accuracy is only at the meter level, which is difficult to meet the positioning accuracy requirements of the pile center;

[0006] Second, divers are required to strictly place the hydrophone in the center of the pile body, which is difficult to implement and expensive

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