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High tower tube bending degree detection method based on three-dimensional laser scanning

A bending degree detection and three-dimensional laser technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of difficult control of precision, large data limitations, poor accuracy of target data, etc., with fast speed and easy acquisition of point cloud , high precision effect

Inactive Publication Date: 2017-12-19
POWERCHINA XIBEI ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of difficult operation, difficult control of accuracy, time-consuming and labor-intensive, poor accuracy of target data and large data limitations in the traditional detection of the curvature of high-rise tower tubes

Method used

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  • High tower tube bending degree detection method based on three-dimensional laser scanning
  • High tower tube bending degree detection method based on three-dimensional laser scanning
  • High tower tube bending degree detection method based on three-dimensional laser scanning

Examples

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Effect test

Embodiment 1

[0038] This embodiment provides a method for detecting the curvature of a tower tube based on three-dimensional laser scanning, combining figure 1 with figure 2 shown, including the following steps:

[0039] Step 1) Obtain point cloud data: set up a 3D laser scanner to obtain point cloud data of the tower body;

[0040] Step 2) Build a TIN model: preprocess the point cloud data obtained in step 1) to build a TIN model of the tower body;

[0041] Step 3) Select the tower section: select two tower horizontal contour sections in the TIN model obtained in step 2), and then determine m towers between the selected two tower horizontal contour sections according to the equal height interval The horizontal contour section of the barrel;

[0042] Step 4) Fitting the central axis of the tower tube: select n points on the perimeter of each tower tube section edge in step 3) in the counterclockwise or clockwise direction at random or at regular intervals, , determine and calculate t...

Embodiment 2

[0046] On the basis of Example 1, specifically, the step 1) meets the following requirements:

[0047] a) The retention points for erecting the 3D laser scanner should form symmetry around the tower, the number of retention should not be less than 4 points, and the horizontal distance between each point and the tower should not be less than 3 / 2 of the height of the tower, and should be complete Scan the entire tower body and height;

[0048] b) Use the compass to determine the direction of the first erection of the first station pointing to the north or a certain direction, and the starting position of the subsequent repeated erection of the scanner should be consistent with the first position;

[0049] c) Every time the scanner is fixed and erected, a centering and leveling device must be used to ensure the scanner is level;

[0050] d) Each scan first performs a fast panoramic rough scan, and then performs a fine scan of the target tower.

Embodiment 3

[0052] In the above two embodiments, the two tower sections selected in the step 3) are the upper and lower sections of the local tower whose curvature is to be measured. Select the horizontal contour section according to the partial tower to be measured, which should be the upper and lower sections of the partial tower to be measured.

[0053] If the tower section to be measured is the entire tower, then the two tower sections selected in step 3) are the top section and the bottom section of the tower, passing through the central axis between the top section and the bottom section and The data can be used to calculate the curvature of the entire tower.

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Abstract

The invention belongs to the technical field of building deformation measurement and particularly relates to a high tower tube bending degree detection method based on three-dimensional laser scanning. The method comprises the steps of (1) arranging an instrument through retention points which are symmetrically arranged around a tower tube as a center, and obtaining point cloud data of a tower tube body, (2) constructing a tube body TIN model, selecting tower tube cross sections, and carrying out fitting of a tower tube central axis, (3) randomly selecting n points or selecting n points with a set interval along a counter-clockwise (or clockwise) direction at the edge perimeters of the cross sections and carrying out reduction of barycentric coordinates of the tower tube cross sections, and (4) calculating a tower tube bending displacement component, a bending displacement resultant and a bending average curvature according to an adjacent cross section through the obtained barycentric coordinates of the tower tube cross sections. According to the method, the disadvantages of difficult field operations, difficult precision control, time and labor consumption, poor accuracy of target data and a large data limitation in the traditional detection of a high tower tube bending degree are solved, the high tower tube bending degree detection can be rapidly and precisely realized, and the method has important practical significance for similar engineering detection and monitoring.

Description

technical field [0001] The invention belongs to the technical field of building deformation measurement, and in particular relates to a method for detecting the curvature of a tower tube based on three-dimensional laser scanning. Background technique [0002] Building deformation measurement is the monitoring of horizontal displacement, settlement, inclination, deflection, cracks, etc. of buildings and their foundations. In particular, fan towers, thermal cooling towers, water towers, chimneys, etc. are mostly towering cylindrical buildings, with the characteristics of high height (greater than 60m) and relatively small cross-section. During long-term operation, this kind of towering tower is reciprocated by its own gravity, natural wind, earthquake and other external force loads, which may cause the tower to tilt, bend, twist and other deformations, and easily cause the tower to topple or collapse. [0003] Today, as the new technology of surveying and mapping matures, new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 吕宝雄
Owner POWERCHINA XIBEI ENG
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