Tunnel section outline measuring method and device based on vision measurement

Abstract

The invention discloses a tunnel section outline measuring method and device based on vision measurement. The measuring method comprises the steps that a structural light source is installed on a measuring trolley to ensure that structural plane light emitted by the structural light source and the inner wall of a detected tunnel intersect, and a marking light bar used for indicating the section outline of the inner wall of the tunnel is formed on the inner wall; a plurality of graph sensors are installed on the measuring trolley, framing ranges of the graph sensors form a ring-belt-like framing range together, and the marking light bar is completely included in the ring-belt-like framing range; co-plane calibration is uniformly conducted on the graph sensors to acquire the mapping relation between plane two-dimensional coordinates and pixel coordinates; the measuring trolley is driven to axially advance along the detected tunnel and conduct graph collection on the way, two-dimensional coordinates of the marking light bar are conversed through the mapping relation, and full-section outline data of the detected tunnel are formed by combination of the two-dimensional coordinates of the marking light bar and position information of all collected points. The tunnel section outline measuring method and device based on vision measurement achieve mobile-type measurement, and are high in measuring speed and precision.

Description

technical field [0001] The invention relates to a method and a device for measuring the contour of a tunnel section, in particular to a method and a device for measuring the contour of a tunnel section based on visual measurement. Background technique [0002] Rail transit has become the most effective measure to solve the problem of urban traffic congestion. A large number of tunnel projects are being or will be put into construction. The deformation and safety inspection of the constructed tunnel outline has become a major measure to ensure the safety of rail transit operations. [0003] In the prior art, the spiral scanning method is mainly used to measure the profile of the tunnel section. In this method, the laser emitting point laser is installed on the measuring vehicle. When the measuring vehicle is moving along the tunnel, the laser is rotated around the tunnel axis. To form a spiral laser trajectory on the inner wall of the tunnel, and obtain the distance from the ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned helical scanning method has the following disadvantages: because the full-section profile of the inner wall of the tunnel under test is often irregular in shape, and there are various deformation defects caused by construction errors, the above-mentioned helical scanning method uses discrete points and rotating scanning methods to measure the full-section of the tunnel. For measurement, the measurement density of the tunnel section is low, the profile information of the section is not comprehensive, and it is easy to cause the missing measurement of the deformation defect area, and the accuracy of the measured tunnel full-section profile is low

[0005] In the prior art, there is also a method of using a single image sensor to measure the profile of the tunnel section, but firstly, it is limited by the resolution limit of a single image sensor, and it is difficult to carry out a forming measurement of a large-sized tunnel profile; secondly, it is necessary to use a flexible The coordinate ruler marks the outline of the tunnel section, and the measurement speed is slow

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