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Bridge body deformation form measuring device and method based on inclination angle and vibration sensing mechanism

A technology of measuring device and inclination sensor, which is applied to measuring devices, optical devices, instruments, etc., can solve problems such as inability to monitor vibration, achieve comprehensive dynamic monitoring, realize passive temperature compensation, and realize the effect of timely monitoring and early warning.

Active Publication Date: 2021-09-07
CCCC SECOND HIGHWAY CONSULTANTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the monitoring systems currently on the market can only monitor the cumulative deformation of the slope, and cannot monitor the vibration caused by the overall movement of the slope or some sudden internal deformation

Method used

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  • Bridge body deformation form measuring device and method based on inclination angle and vibration sensing mechanism
  • Bridge body deformation form measuring device and method based on inclination angle and vibration sensing mechanism
  • Bridge body deformation form measuring device and method based on inclination angle and vibration sensing mechanism

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Embodiment 1

[0038] At present, most fiber grating inclination sensors A can only monitor the cumulative deformation of the bridge body, but cannot monitor the overall movement of the bridge body or the vibration caused by some sudden deformation inside the bridge body. In order to solve the above problems, in this embodiment, provide A bridge body deformation shape measurement device based on inclination angle and vibration sensing mechanism is proposed, which includes a light source, a diode photodetection array, a fiber grating demodulator and several fiber grating inclination sensors A. Among them, such as image 3 As shown, a number of fiber grating inclination sensors A are connected in series by optical fibers and fixed on the cantilever bridge body S. The optical signal generated by the light source is input to one end of the optical fiber, and the optical signal output by the other end of the optical fiber is detected by the diode photodetection array, and The optical signal is conv...

Embodiment 2

[0061] In the process of monitoring the deformation of the bridge body, the fiber grating 4 is not only affected by the stress change, but also affected by the vibration signal of the site construction, the inclination information of the deflection shape of the bridge body and the construction vibration information are mixed, and it is difficult for the fiber grating demodulator to distinguish Two kinds of signals, in order to solve the above problems, this embodiment, on the basis of Embodiment 1, provides a method for measuring the deformation shape of the bridge body based on the inclination angle and the vibration sensing mechanism, which specifically includes the following steps:

[0062] S1. Analyze the stress state of the bridge body based on the finite element analysis method, and obtain the optimal monitoring positions of several fiber grating inclination sensors A. Several optimal monitoring positions divide the bridge body into several distances, and record the adjace...

Embodiment 3

[0079] On the basis of Embodiment 2, this embodiment provides the specific steps of S3 in Embodiment 1, and S3 specifically includes the following steps:

[0080]S101, the fiber grating inclination sensor A closest to the fixed end of the cantilever bridge body S of the tower column is used as a standard reference inclination sensor, and its deflection displacement is zero;

[0081] S102, such as Figure 4 As shown, when the cantilever bridge body S is deformed, the inclination change of the first FBG sensor on the right side of the standard reference inclination sensor is recorded as θ 1 , then the deflection displacement at the top of the segment is: D 1 = d 1 =L 12 · sinθ 1 , where L 12 Indicates the horizontal distance between the standard reference inclination sensor and the first FBG sensor on the right; d 1 Represents the deflection displacement at the top of the first section of the bridge body, D 1 Represents the overall deflection displacement of the first sec...

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Abstract

According to the bridge body deformation form measuring device and method based on the inclination angle and vibration sensing mechanism, based on the new sensing mechanism of inclination sensitivity and vibration sensitivity, a fiber bragg grating inclination angle sensor is designed into a swing angle type fiber bragg grating inclination angle sensing and vibration sensing elastic structural body of a sensitization structure, and the detection sensitivity requirement is met through the sensibilization design; and according to the invention, the accumulated deformation of the bridge body and the inclination change of the bridge body can be monitored, the vibration monitoring capability is realized, the vibration caused by the sudden deformation of the bridge body can be monitored, the timely monitoring and early warning of the sudden deformation can be realized, and the dynamic monitoring of the bridge body is more comprehensive.

Description

technical field [0001] The invention relates to the field of bridge deformation monitoring, in particular to a bridge body deformation shape measuring device and method based on an inclination angle and a vibration sensing mechanism. Background technique [0002] Cable-stayed bridges are high-order statically indeterminate structures, and their structural systems and loads change continuously during cantilever construction, which is a typical complex time-varying condition. Since the calculation parameters used in the design of the cable-stayed bridge do not completely match the actual conditions during construction, there is a certain deviation between the structural deformation and the expected results during the construction stage. If this cumulative deviation cannot be controlled and adjusted in time, as the cantilever length of the main girder increases, the structure of the cable-stayed bridge will deviate from the design target, resulting in difficulty in closing, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01D21/02
CPCG01B11/16G01D21/02Y02T90/00
Inventor 薛维龙高博杨幼江郭安辉沈平丁德平刘日圣万小全马小军廖亚雄
Owner CCCC SECOND HIGHWAY CONSULTANTS CO LTD
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