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Point cloud-based tower body perpendicularity detection system of building tower crane

A detection system and verticality technology, applied in radio wave measurement systems, measuring devices, measuring instruments, etc., can solve the problem of inability to reflect the inclination of the tower body, and achieve the effect of accurate verticality

Active Publication Date: 2019-12-24
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The tower body is not integrally formed, but is usually composed of many standard sections. This method regards the tower body as a whole rigid body, and measuring the verticality cannot reflect the true inclination degree of the tower body

Method used

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  • Point cloud-based tower body perpendicularity detection system of building tower crane
  • Point cloud-based tower body perpendicularity detection system of building tower crane
  • Point cloud-based tower body perpendicularity detection system of building tower crane

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Embodiment approach

[0027] According to one embodiment, the perpendicularity detection device 40 includes a fitting device and a perpendicularity calculation device, and the fitting device performs straight line fitting on all central points to obtain the central axis. According to this kind of implementation manner, the perpendicularity calculation device can adopt the random sampling consensus algorithm to determine the direction vector m of the central axis, and calculate the direction vector m=(x, y, h) and the vertical direction unit vector n 0 = the included angle of (0, 0, 1), the included angle is recorded as α, and tanα is the perpendicularity.

[0028] According to another embodiment, the perpendicularity detection device 40 respectively calculates the perpendicularity of a straight line formed by two adjacent point cloud center points, and determines the maximum perpendicularity as the perpendicularity of the tower body. The straight line passing through the two adjacent point cloud ce...

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Abstract

The invention relates to a point cloud-based tower body perpendicularity detection system of a building tower crane. The system comprises a point cloud acquisition device used for acquiring a point cloud of a tower body of the building tower crane, a point cloud cutting device used for cutting the point cloud by taking a vertical direction as a cutting dimension and obtaining multiple point cloudsections corresponding to the number of standard sections of the tower body, a point cloud center point acquisition device which acquires center points of the point cloud sections, and a perpendicularity detection device which detects the perpendicularity of the tower body according to the center points of the point cloud sections.

Description

technical field [0001] The invention relates to the field of verticality measurement of tower cranes for building construction. Background technique [0002] The verticality of the tower body is very important for the safe operation of the construction tower crane. At present, the following method is usually used to measure the verticality of the tower body: first, set up the theodolite at a predetermined distance from the height of the tower crane, aim at the top of the tower crane, use the theodolite to measure it, make a mark, measure the horizontal distance from the bottom, and use Observing two or more measurement rounds by methods such as forward and backward mirror projection method, and taking the average value. This method has many advantages, but also has some disadvantages. The tower body is not formed in one piece, but is usually composed of many standard sections. This method regards the tower body as a whole rigid body, and measuring the verticality cannot re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/12G01C15/00G01S17/88
CPCG01C15/002G01C15/12G01S17/88
Inventor 周命端杜明义张文尧王坚周乐皆
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE