A 3D Laser Scanner Deformation Monitoring Method for Bridge Tower Columns
A three-dimensional laser, deformation monitoring technology, applied in the direction of instruments, measuring devices, elasticity testing, etc., can solve problems such as the inability to use total station bridge towers
Inactive Publication Date: 2020-12-11
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology
However, there is no reflective prism on the top of the bridge tower, so traditional methods such as a total station cannot be used to directly observe the bridge tower
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[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0037] This embodiment carried out long-term monitoring to the tower column of a certain bridge in Guangzhou from March 16, 2017 to August 18, a total of 6 times, and recorded the traffic level, wind force and temperature at that time. The structure of the bridge is as follows figure 1 As shown, the bridge tower is a single-tower, single-cable, surface cable-stayed bridge with an "H" cross-section, and a total of 4 cable-stayed cables are set to bear the main span's own weight and part of the traffic load. Since there is no reflective prism on the top of the bridge tower, the bridge tower cannot be directly observed by traditional methods such as a total station, so the detection method of this embodiment is used to monitor the deformation of the bridge tower.
[0038] A method for monitoring deformation of a bridge pylon with a three-dimension...
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The invention discloses a deformation monitoring method for a bridge pillar three-dimensional laser scanner. The method comprises the steps that three scanning stations are erected on sidewalks on both sides of a bridge deck, and four fitting target balls are fixed on auxiliary facilities near a bridge tower; each scanning station completes bridge tower scanning according to a set interval periodto acquire a bridge tower point cloud data model; after the bridge tower point cloud data model is aligned repeatedly, a deviation chromatogram of a reference model and a comparison model is established; the deviation value, which is relative to the reference model, of the intersection of each Z-direction section in the comparison model and three ridges in X and Y directions is the deflection value of the Z-direction position; and binomial curve fitting is carried out on the deviation value to acquire a disturbance monitoring result graph in X and Y directions. According to the invention, thethree-dimensional laser scanner technology is used to quickly and efficiently acquire the variation of three ridges of the bridge tower in transverse and forward bridge directions; the problems that the bridge tower has no prefabricated reflecting prism and measuring points are limited are solved; and a new direction is provided for long-term deformation monitoring of the bridge.
Description
technical field [0001] The invention relates to the field of bridge deformation monitoring, in particular to a deformation monitoring method of a bridge tower column with a three-dimensional laser scanner. Background technique [0002] Although there are many deformation monitoring objects of bridge structures, generally speaking, there are two kinds of displacements in the horizontal direction and vertical direction. In order to meet the requirements of the monitoring object, the current bridge deformation monitoring mainly follows the traditional monitoring methods, namely the geodetic method and the physical sensor method. Traditionally, optical or electronic measuring instruments, including levels, theodolites, total stations, etc., are used to periodically and repeatedly detect the three-dimensional coordinates of established measuring points, thereby monitoring horizontal displacement and vertical displacement. This method has been used since the 1980s and has high pr...
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IPC IPC(8): G01B11/16G01M5/00
CPCG01B11/16G01M5/0008G01M5/005G01M5/0091
Inventor 钟宏武贺志勇欧阳俊锋邱艳芳
Owner SOUTH CHINA UNIV OF TECH