Method and system for detecting linearity and rigidity of bridges and tunnels on basis of fiber-optic gyroscope technology

A fiber optic gyroscope and detection system technology, which is used in the testing of machine/structural components, measurement devices, and the use of optical devices, etc., can solve the problems of difficult monitoring scale, complex measurement point burial, lack of position correction algorithm and local filtering algorithm, etc. , to achieve the effect of improving the accuracy

Active Publication Date: 2012-09-12
WUHAN UNIV OF TECH
View PDF9 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above-mentioned tunnel deformation test content, at present, it mainly relies on steel rulers, convergence gauges, level gauges or total stations, and single-point or multi-point displacement gauges. These methods have several common defects: the embedding of measuring points is complicated, and the degree of automation is not high. High, it is difficult to expand the monitoring scale with high cost performance, the representativeness of the measuring point layout is not strong, the data is scattered, and there is a lack of unified and rapid detection methods for the tunnel cross-section and the continuous deformation trajectory along the tunnel, and it is impossible to grasp the overall deformation state of the tunnel
[0004] The fiber optic gyroscope technology is applied to the continuous and rapid detection of the alignment and stiffness of bridges and tunnels, which can make up for the strong discreteness of the measurement points of various existing measurement methods, and the inability to detect the alignment distortion points caused by local damage based on the continuous deformation trajectory. The high cost of GPS testing, Insufficient accuracy for testing small bridges, the level or total station is only suitable for the tunnel entrance section, the convergence g

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and system for detecting linearity and rigidity of bridges and tunnels on basis of fiber-optic gyroscope technology
  • Method and system for detecting linearity and rigidity of bridges and tunnels on basis of fiber-optic gyroscope technology
  • Method and system for detecting linearity and rigidity of bridges and tunnels on basis of fiber-optic gyroscope technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Linear measurements on bridge surfaces:

[0064] see Figure 7 , the alignment detection walking device 10 is attached to the bridge alignment test area 54 to walk, and selects reference points 55 that can be regarded as fixed along the line, such as bridge piers, and measurement reference points 52 at both ends of the bridge for error correction. When the linear detection walking device 10 is tested each time, a known fixed reference point 52 is fixed at one end to ensure that each phase of the test has the same measurement starting point. get as Figure 6 The original linear measurement curve 41, when the linear detection walking device passes the fixed reference point 52 on the other side and the fixed reference point 55 along the way, since the coordinate information of such points is known, it can be used as the boundary of the continuous linear trajectory data Constraint conditions, use the aforementioned algorithm (2) to reversely correct and segmentally calcul...

Embodiment 2

[0066] Linear measurement along the tunnel direction and cross-section in the tunnel:

[0067] See respectively Figure 8 and Figure 9, for the alignment test of the tunnel driving direction, the external reference point 61 of the tunnel entrance is used as the measurement starting point, and the fixed reference point 61 is passed through the alignment detection along the tunnel direction to ensure that each phase of the test has the same measurement starting point. The linear test area 64 along the tunnel is tested, and the raw data of the gyroscope are processed by algorithm (1) and then the original trajectory algorithm is used to obtain the following: Figure 6 The original alignment measurement curve 41, the reference point 62 of the area with better surrounding rock conditions passed by the alignment detection walking device and the fixed reference point 61 outside the tunnel on the other side can be used as the boundary of the continuous alignment trajectory data beca...

Embodiment 3

[0069] Linear measurement of mine tanks or elevator shafts:

[0070] The rigid tanks of the mine tanks are generally installed directly on the underground rocks, which are easily affected by the underground geological structure and cause jamming accidents. By adopting the device of the invention, the linear curve of the tank can be regularly detected, and the reliability of the safe operation of the current tank can be evaluated. For its implementation see Figure 10 , the test integration device 31 is installed in the cage lifting container 85 , and the linear speed sensor 12 is installed on the roller tank ears 83 . In this example, the gyroscope in the test integration device 31 may be a three-axis gyroscope. During the test, the lifting container 85 carries the test integration device 31 attached to the rigid tank 84 and advances along the lifting direction 86 . Use the algorithm (1) to process the raw data of the gyroscope, and then use the aforementioned original traj...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method and a system for detecting the linearity and the rigidity of bridges and tunnels on the basis of a fiber-optic gyroscope technology. The method comprises the steps that a linear detecting and walking device moves on the inner surface of a bridge or tunnel structure being detected; data detected by a fiber-optic gyroscope and a linear velocity sensor are algorithmically processed; and a motion trajectory of the device, namely a trajectory in a gravity direction of the bridge structure being detected and a trajectory along the trend of the tunnel or in the circumferential direction of the cross section of the tunnel, is obtained through calculating the data according to a formula. The data are corrected on the basis of a data stability judging and abnormal value eliminating algorithm, a reverse correcting algorithm of position information of datum points and reference points and a structural overall large deformation and surface local small deformation filtering algorithm, so as to obtain a local small deformation rejecting curve for analyzing the rigidity of the bridge and the tunnel. The method and the system are used for ascertaining local damages of bridge structures and tunnel structures and detecting the trajectory of global deformation in the vertical direction of the bridges and along the trend and multiple cross sections of the tunnels. Compared with a traditional method for detecting the linearity of the bridges and the tunnels, the method provided by the invention has the advantages of short test cycle, high maneuverability, low cost, high precision and high data coherence.

Description

technical field [0001] The invention relates to a detection method and equipment for structural alignment and stiffness testing of bridges and tunnels, in particular to a bridge and tunnel alignment and stiffness detection method and system based on fiber optic gyroscope technology. It is suitable for the detection of structural alignment and stiffness testing of bridges such as cable-stayed bridges, suspension bridges, continuous girder bridges, continuous rigid-frame bridges, arch bridges, expressway road network bridges, road tunnels, and railway tunnels. Background technique [0002] The stress, cracks, prestress loss, material degradation, and stiffness degradation of the bridge structure all cause changes in the alignment. The safety and stability of the tunnel structure is closely related to the deformation and stress state of the support structure and the surrounding rock mass. Before the various failure forms of the support structure and the surrounding rock mass oc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01B11/16G01M99/00
Inventor 姜德生王立新胡文彬李盛刘芳杨燕高雪清
Owner WUHAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap