Pile body top surface center three-dimensional coordinate high-precision determination method based on point cloud data

Abstract

The invention provides a pile body top surface center three-dimensional coordinate high-precision determination method based on point cloud data. The method comprises the steps that the point cloud data of the top surface of a pile body are acquired through a remote sensing measurement mode; then the center of the top surface of the pile body is solved and positioned by using a center method; thenthe radius r is changed according to the previously acquired coordinates, and sounding points of which the radius apart from the initial center of circle meets the following formula are searched; andfinally the sounding points are acquired, and the following equation is constructed so that the final coordinates of the center of circle of the top surface of the pile body are acquired. The methodcan be used for high-precision determination of the three-dimensional coordinates of the center of the top surface of the underwater pile body so that the problems of positioning of the top surface ofthe pile body and installation of an offshore wind power frame can be solved. Compared with the conventional positioning method, the method has the advantages of being high in precision, high in efficiency, low in cost, low in risk and convenient to implement.

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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