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

Abstract

A detection method and system for alignment and stiffness of bridges and tunnels based on fiber optic gyroscope technology. In this method, the linear detection walking device moves along the inner surface of the bridge or tunnel structure under test, and the data measured by the fiber optic gyroscope and the linear velocity sensor are processed by algorithm, and the motion track of the device is calculated according to the formula, that is, the gravity of the bridge structure under test Direction and continuous deformation trajectory of tunnel strike or cross-section circumferential direction. Based on the data stability judgment and outlier elimination algorithm, the reverse correction algorithm of the position information of the reference point and the reference point, and the filtering algorithm of the overall large deformation of the structure and the local small deformation of the surface, the data is corrected and calculated to obtain the local minimum of the stiffness analysis of bridges and tunnels. Deformation culling curves. This method is used to detect the local damage of bridges and tunnel structures, and the global deformation trajectory detection of bridge vertical, tunnel direction and multi-cross sections. Compared with traditional bridge and tunnel alignment detection, this method has shorter test period, high operability, low cost, high precision and high data consistency.

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...

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 gauge cannot be used during the tunnel operation period, the installation of the displacement gauge requires drilling, and the on-site implementation of the China Unicom pipeline shape monitoring system requires power supply, etc.

[0005] Chinese patent applications 02147772.8 and 201010117675.6 both involve a measurement method that uses a fiber optic gyroscope to measure deformation, but lacks a position correction algorithm and a local filtering algorithm, the measurement results are prone to divergence and drift, and it is impossible to measure the overall deformation of the structure and the local deformation of the structure surface. analyze

[0006] Chinese patent 20101017391.8 proposes a device for measuring inclination that integrates a fiber optic gyroscope and an accelerometer, but this device cannot provide a specific line shape, let alone analyze and correct the measured inclination, and cannot obtain accurate deformation of the measured object quantity

Since the tester described in this patent only measures the running trajectory, and does not perform data processing in line with specific structural analysis for the measured trajectory, it cannot provide effective and accurate measurement of the surface structure of bridges or tunnels. Linear data for stiffness analysis of

Images