CN107860538B - Detachable system widely applicable to multipoint dynamic deflection calibration and application thereof - Google Patents
Detachable system widely applicable to multipoint dynamic deflection calibration and application thereof Download PDFInfo
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- CN107860538B CN107860538B CN201711416677.3A CN201711416677A CN107860538B CN 107860538 B CN107860538 B CN 107860538B CN 201711416677 A CN201711416677 A CN 201711416677A CN 107860538 B CN107860538 B CN 107860538B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
Abstract
A detachable system widely applicable to multipoint dynamic deflection calibration and application thereof belong to the field of multipoint dynamic deflection calibration. The device is characterized by comprising a support, section steel, a displacement loading device and a displacement generating device; a support, an inclination sensor and a receiver are arranged below the section steel, and the inclination sensor is connected with a host machine of the inclination bridge deflection instrument; the receiver receives signals sent by the photoelectric bridge deflection instrument, and the displacement generator is loaded on the section steel through a plurality of displacement loading devices. According to the invention, the multi-position dynamic deflection is preset through the change of the structural model, the deflection curve is drawn in real time, and meanwhile, the deflection value can be recorded and reproduced. The method can realize verification/calibration of multipoint dynamic deflection and enhance the reliability of the equipment magnitude.
Description
Technical Field
The invention belongs to the field of multipoint dynamic deflection calibration.
Background
The deflection of the bridge is a very important parameter for the bridge structure, and the deflection directly reflects the vertical integral rigidity of the bridge structure and is an important basis for reflecting the linear change of the bridge. The deflection measuring instruments commonly used by people at present comprise a precise level gauge, a total station, a GPS, an auto-collimator and the like, and the measuring instruments are all universal measuring instruments, the measuring method is relatively simple, and the measuring instrument is generally used for measuring static deflection of a bridge and has the problems of time consumption, labor consumption and on-line detection difficulty. The bridge deflection instrument is a novel and special bridge deflection measuring instrument, and is mainly used for measuring static and dynamic deflection of a bridge, and completing, accepting and identifying the bridge; detecting special bridges such as military floating bridges, hanging bridges and the like; deformation and vibration displacement monitoring of dams and wharfs, or displacement measurement of deformation and vibration of beams, columns, high-rise buildings, hoisting machinery, drilling platforms and the like of large-span structures. The method can be divided into an inclinometer, an accelerometer, a communicating pipe method, an optical fiber displacement sensor or a strain gauge, an optical fiber gyroscope, a differential GPS, a digital image method and the like according to detection methods, the methods have advantages and disadvantages, the method is suitable for different application occasions according to equipment performance and structural characteristics, the method is widely used, but an effective calibration method is not established for the equipment at present to realize engineering measurement of the equipment, the method is based on previous research to deeply analyze factors influencing bridge deflection, summarize past failure cases, combine years of engineering practice experience, and the calibration method obtained through repeated test verification is used for tracing the photoelectric bridge deflection instrument and the inclination bridge deflection instrument, guiding engineering construction and guaranteeing accuracy of measured data.
At present, the bridge deflection instrument usually adopts a method of comparing with the electro-optical distance meter to verify the accuracy of the output value of the bridge deflection instrument, thereby realizing the tracing of the bridge deflection instrument.
1) The photoelectric distance measuring instrument often needs to be provided with a receiver in the detection process, but in the actual operation process, the bridge deflection instrument is limited by the structural aspect, so that the measurement performance can not be directly affected after the photoelectric distance measuring instrument is installed or the measurement can not be realized finally.
2) Most bridge deflection meters at present have a multipoint detection function, but electro-optical distance meters cannot measure the multipoint measurement function of equipment due to the limitation of a measurement principle, so that the measurement range of the equipment is limited, and the measurement capability is insufficient.
Disclosure of Invention
Based on the analysis, a detachable system widely suitable for multi-point dynamic deflection calibration is developed, multi-position dynamic deflection is preset through the change of a structural model, a deflection curve is drawn in real time, and the deflection value can be recorded and reproduced. The method can realize verification/calibration of multipoint dynamic deflection and enhance the reliability of the equipment magnitude.
1) The calibration of the bridge deflection instrument is realized by adopting a preset curve technology;
and (3) downwards pre-pressing the section steel of the multipoint dynamic deflection calibration device at a characteristic point for a certain height along the section direction, generating a specific curve, maintaining for a period of time, and measuring and recording deflection values by a bridge deflection instrument.
2) The dynamic calibration of the bridge deflection instrument is realized by applying a method for dynamically adjusting a displacement curve;
the dynamic measurement capability and the time response capability of the bridge deflection instrument are measured by adopting a displacement curve dynamic adjustment method, the accuracy of an output result of the instrument and the stability of a measurement process are verified, the applicability of on-line monitoring of the instrument is ensured, and the engineering monitoring requirement is met.
3) The calibration of the multi-point dynamic deflection bridge deflection instrument is realized by using an independent multi-point driving mode;
the multi-point multi-section preset bridge deflection meter is adopted to verify whether the bridge deflection meter is suitable for the real-time monitoring measurement of the large-span bridge, the overall performance of the bridge deflection meter is comprehensively and systematically measured through test simulation and emulation technology, and the accuracy and the integrity of the output result of the bridge deflection meter are ensured.
The multipoint dynamic deflection calibration device mainly comprises a support, section steel, a displacement loading device, a displacement generating device and the like, wherein hardware connection is shown in fig. 1, and a technical scheme flow chart is shown in fig. 2.
A support, an inclination sensor and a receiver are arranged below the section steel, and the inclination sensor is connected with a host machine of the inclination bridge deflection instrument; the receiver receives signals sent by the photoelectric bridge deflection instrument, and the displacement generator is loaded on the section steel through a plurality of displacement loading devices;
furthermore, the loading device adopts a hydraulic driving element, an electric control system and a feedback system to realize intermodal control through a central processing unit.
The mounting mode of this patent is as follows:
1) Leveling the multipoint dynamic deflection calibration device;
2) Each displacement loading device is respectively placed at a designated position of the multi-point dynamic deflection device;
3) Installing an inclination angle sensor and a receiver at a designated position of the multi-point multi-deflection calibration device;
4) Carrying out mechanical analysis on the integral model of the profile steel, setting loading displacement values and outputting driving force to enable the loaded curve to be consistent with a theoretical curve, starting a displacement loading device, respectively loading different displacement values, and loading and maintaining each loading device for more than 2 minutes according to one or more preset curves;
5) Starting a bridge deflection instrument to be detected, and detecting and recording a bridge deflection value;
6) And (5) ending bridge deflection measurement, and unloading the displacement loading device.
The specific test process of the detachable system for multipoint dynamic deflection calibration is as follows:
and placing the multipoint dynamic deflection calibration device on a test platform, and leveling. Each displacement loading device is placed at a designated test position, a pre-designed displacement curve is input into a controller of the multi-point dynamic deflection calibration device, parameters of a section steel material brand, a section size, a length and a fulcrum position are input, the displacement is driven by calculating a driving moment, finally each point displacement value and driving force value are output through an output driving device, and meanwhile a force value monitoring sensor and a displacement sensor are arranged outside the displacement loading device to monitor actual output values in real time and correct the errors in real time. And installing the measuring part of the bridge deflection instrument to be detected at the designated position of the multi-point dynamic deflection device, starting the displacement loading device according to the parameters, keeping for 3-5 minutes, detecting the bridge deflection value by the bridge deflection instrument to be detected, and outputting the magnitude. Different curves are input according to the steps.
The output curve of the multi-point dynamic deflection calibration device is measured by a laser interferometer, so that the coincidence degree of the output curve and the input curve of the multi-point dynamic deflection calibration device reaches 99.98 percent, and the measurement precision is far higher than that of a detected instrument.
Drawings
Multi-point dynamic deflection calibration device of figure 1
1-support 2-inclination sensor 3-inclination bridge deflection instrument host 4-section steel 5-photoelectric bridge deflection instrument 6-receiver 7-displacement loading device 8-displacement generator
Figure 2 is a flow chart of a technical scheme of the multipoint dynamic deflection device
FIG. 3 is a diagram showing the effect of the present invention
Detailed Description
The mounting manner of this example is as follows:
1) Leveling the multipoint dynamic deflection calibration device;
2) Each displacement loading device is respectively placed at a designated position of the multi-point dynamic deflection device;
3) Installing a bridge deflection meter measuring component at a designated position of a multi-point multi-deflection calibration device;
4) Starting displacement loading devices to load different displacement values respectively, wherein each loading device loads and holds for more than 2 minutes according to one or more preset curves;
5) Starting a bridge deflection instrument to be detected, and detecting and recording a bridge deflection value;
6) And (5) ending bridge deflection measurement, and unloading the displacement loading device.
Effects of the invention
The calibration of the bridge deflection instrument is realized by adopting a preset curve technology, so that the accuracy of the test result of the bridge deflection instrument is ensured;
the dynamic calibration of the bridge deflection instrument is realized by adopting a displacement curve dynamic adjustment method, and the dynamic measurement capacity of the bridge deflection instrument is measured.
The calibration of the multi-point dynamic deflection bridge deflection instrument is realized by using a multi-point driving mode, and the accuracy of the bridge deflection instrument on the measurement result of the large-span structure and the stability of the measurement process are ensured.
1. The mechanical analysis is carried out on the integral model of the profile steel by using mature finite element analysis software widely used in industry, a mode of combining theory and practice is adopted, loading displacement values are reasonably set, and enough driving force is output to enable the loaded curve to be consistent with the theoretical curve, and the profile steel can be kept for a period of time.
2. The good matching of the intensity of energy, the magnitude of loading displacement and the like of different loading points is a basic hardware foundation for accurately carrying out metering in the later period.
3. The loading device adopts a precise hydraulic driving element, an electrical control system and a high-precision feedback system to realize intermodal control through a central processing unit.
Claims (2)
1. The method is characterized in that a system used by the method comprises a support, section steel, a displacement loading device and a displacement generating device; a support, an inclination sensor and a receiver are arranged below the section steel, and the inclination sensor is connected with a host machine of the inclination bridge deflection instrument; the receiver receives signals sent by the photoelectric bridge deflection instrument, and the displacement generator is loaded on the section steel through a plurality of displacement loading devices; the method comprises the following steps:
1) Leveling the multipoint dynamic deflection calibration device;
2) Each displacement loading device is respectively placed at a designated position of the multi-point dynamic deflection device;
3) Installing an inclination angle sensor and a receiver at a designated position of the multi-point multi-deflection calibration device;
4) Setting loading displacement values for the profile steel and outputting driving force to enable the loaded curve to be consistent with a theoretical curve, starting a displacement loading device to load different displacement values respectively, and loading and maintaining each loading device for more than 2 minutes according to one or more preset curves;
5) Starting a bridge deflection instrument to be detected, and detecting and recording a bridge deflection value;
6) And (5) ending bridge deflection measurement, and unloading the displacement loading device.
2. The method of claim 1, wherein the displacement loading device is controlled by a central processing unit using a hydraulic drive element, an electrical control system, and a feedback system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711416677.3A CN107860538B (en) | 2017-12-25 | 2017-12-25 | Detachable system widely applicable to multipoint dynamic deflection calibration and application thereof |
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| CN201711416677.3A CN107860538B (en) | 2017-12-25 | 2017-12-25 | Detachable system widely applicable to multipoint dynamic deflection calibration and application thereof |
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| CN107860538B true CN107860538B (en) | 2023-10-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211299B (en) * | 2018-09-10 | 2023-08-25 | 交通运输部公路科学研究所 | Bridge monitoring sensor online calibration method and system |
| CN111537127B (en) * | 2020-05-13 | 2022-03-11 | 西北工业大学 | Full-range calibration method of X-ray stress gauge |
| CN111692985B (en) * | 2020-06-19 | 2022-01-28 | 交通运输部公路科学研究所 | Constant-load deflection analysis method for single-span simply-supported girder bridge under traffic passing condition |
| CN111895963A (en) * | 2020-06-30 | 2020-11-06 | 同恩(上海)工程技术有限公司 | Small deformation member deflection monitoring method and system based on rigidity fitting and storage medium |
| DE102021100106B4 (en) | 2021-01-06 | 2023-12-07 | GEMAC Chemnitz GmbH | System and procedure for structural monitoring |
| CN115096529B (en) * | 2022-07-26 | 2023-08-04 | 大连理工大学 | Bridge dynamic deflection distributed measurement device and measurement method |
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