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Irregular section tunnel inner wall image projection expansion method

An in-tunnel, irregular technology, applied in cross-section description, instruments, surveying and navigation, etc., can solve the problems of inaccurate measurement and tunnel projection deformation, and achieve the effect of ensuring accuracy, easy processing, and suitable for promotion.

Active Publication Date: 2017-10-13
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used projection method is equiangular projection, but it is only suitable for circular shield tunnels. For other types of tunnels, projection deformation will occur, resulting in inaccurate measurement of the position and shape of various elements on the image. At present, how to integrate different shapes of space There is no unified method to expand the cross-sectional projection into a planar figure and ensure that the relative positions of the elements on the image remain unchanged.

Method used

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  • Irregular section tunnel inner wall image projection expansion method
  • Irregular section tunnel inner wall image projection expansion method
  • Irregular section tunnel inner wall image projection expansion method

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Embodiment

[0016] Embodiment: In this embodiment, the image projection and unfolding method of the inner wall of the tunnel with irregular section includes the following steps:

[0017] 1) Cross-section extraction: the original tunnel point cloud data scanned by a 3D laser scanner is in the shape of a long and narrow columnar body, such as figure 1 shown. The original tunnel point cloud data is divided into several slices along the tunnel mileage direction y, and each slice is the section of the tunnel. Such as figure 2 As shown, the tunnel point cloud data is divided into sections i, i is the variable value of the number of sections, and the value can be selected in the variable of the number of sections; for example, if the tunnel point cloud data is divided into 1000 sections, i The value range is 1-1000.

[0018] 2) Calculation of section center: Calculate the section center of gravity of each section, take the section center of gravity as the section center, and take the vertica...

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Abstract

The invention relates to the technical field of tunnel disease detection, in particular to an irregular section tunnel inner wall image projection expansion method. The method is characterized in that it comprises at least the steps of: section extraction, section center calculation, section scanning point sorting and starting point determination, section scanning point spacing calculation, determination of the projection expansion coordinate of each scanning point, and interpolation for image generation. The method provided by the invention is suitable for inner wall image generation of any irregular section tunnel, has wide range of application, guarantees unchanged relative positions of all image elements on an image, can ensure accuracy, is simple and convenient, and is suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of tunnel disease detection, in particular to an image projection and unfolding method for an inner wall of a tunnel with an irregular section. Background technique [0002] At present, as a new type of surveying and mapping instrument, the 3D laser scanner can quickly and accurately obtain the 3D point coordinates and reflectivity information of the target without touching the target. The maintenance work is facilitated. Through the identification and interpretation of various auxiliary facilities and disease information on the image, the position information and shape information of the required elements can be obtained. [0003] According to the requirements of factors such as tunnel use and construction methods, the current subway interval tunnels mainly include underground excavation horseshoe-shaped section tunnels, circular shield tunnels, and open-cut rectangular section tunnels. The commonly used p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C7/06
CPCG01C7/06
Inventor 刘碟许正文王令文周理含高志强袁钊
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST