Rail Walking Tunnel Deformation Detection System
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Solution Overview
Problem
Current methods for detecting cross section deformation in subway tunnels are inefficient, requiring extensive manual effort and time, and are unsuitable for long-distance projects, leading to low operational safety and high costs due to the need for multiple personnel and equipment.
Innovation Solution
A rail walking mechanism equipped with a fractional laser structured light source and industrial focus-fixed cameras, which constructs a partial three-dimensional coordinate system, allowing for rapid data acquisition and transformation into a global coordinate system, enabling precise and efficient deformation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional total-station instrument method is used to detect cross section deformation, then measurement can be completed with simple equipment, but measurement efficiency is extremely low and time consumption is high
Solution Approach 1:
The patent replaces the traditional mechanical total-station instrument with an automated optical measurement system consisting of laser scanners and cameras. This substitution eliminates manual operation requirements and enables automated data acquisition, transforming the measurement process from mechanical manual surveying to automated optical scanning, thereby dramatically improving measurement efficiency and reducing time consumption.
Solution Approach 2:
The patent changes the measurement parameters by using laser range data and image data to directly calculate three-dimensional coordinates of tunnel cross-sections. Instead of traditional angle and distance measurements requiring manual calculation, the system uses laser ranging distances combined with camera imaging to directly obtain spatial coordinates, fundamentally changing the measurement approach and enabling rapid automated processing.
2Measurement precision
If vehicle-mounted laser scanners are used to test tunnels, then cross section deformation images can be obtained, but the resulting files have vast capacity and cannot give geometric parameters, requiring manual reading and judging
Solution Approach 1:
The patent merges laser scanning technology with photography technology into a unified measurement system. The laser scanner provides precise distance measurements while the camera captures visual information, and both data streams are processed together through coordinate transformation algorithms to directly generate geometric parameters of tunnel cross-sections, eliminating the need for separate manual analysis.
Solution Approach 2:
The patent introduces coordinate transformation as an intermediary process that bridges the raw laser range data and camera image data to produce meaningful geometric parameters. By establishing coordinate systems and performing transformations, the system converts complex raw measurement data into directly usable deformation geometric parameters, serving as a mediator between data acquisition and result interpretation.
3Reliability
If annular single-line laser and multiple cameras are used for detection, then water leakage and seepage can be detected, but the geometric parameters of each annular cross section deformation are individual, independent and relative, failing to form a correlated coordinate system
Solution Approach 1:
The patent creates a universal correlated coordinate system that can simultaneously represent multiple tunnel cross-sections in a unified reference framework. This coordinate system serves multiple functions: it provides absolute positioning for each cross-section, enables comparison between different sections, and maintains data stability despite device movement. The system transforms individual relative measurements into a cohesive set of absolute coordinates within a correlated framework.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly enhances the speed and accuracy of tunnel deformation detection, reducing manual effort and data processing time, and ensures stable and comparable deformation data, thereby improving operational safety and maintenance efficiency of subway networks.
Implementation Method 1
a fractional laser structured light source
Implementation Method 2
fractional laser as an auxiliary structured light source
Implementation Method 3
industrial focus-fixed cameras acquire imaging data
Data Source
AI summary
The present invention relates to a system for quickly detecting tunnel deformation, comprising a rail walking mechanism (1) disposed on a subway rail, and an acquisition system (2) disposed on the rail walking mechanism (1); wherein the rail walking mechanism (1) is a T-shaped walking platform, comprising a cross shaft (11), a longitudinal shaft (12) and a stand column (13); the cross shaft (11) and the longitudinal shaft (12) are connected to form the T-shaped platform; tread wheels (16) are disposed at the bottom of the T-shaped platform; one end of the stand column (13) is vertically connected with the cross shaft (11), and the other end of the stand column is used for configuring an operating platform (14) of the acquisition system (2); the acquisition system (2) comprises a fractional laser structured light source (21), industrial focus-fixed cameras (22) and a computer; and the computer is connected with the industrial focus-fixed cameras (22). Compared with the prior art, the quick detection device can effectively solve the problem of detecting cross section deformation of tunnels, the problem of transforming many different local coordinate systems to a global coordinate system, and the problem of unstable test data caused by movements.