DOI: https://doi.org/10.30977/BUL.2219-5548.2019.86.1.20

Measuring system of strain monitoring of bridge structural components and bridge clearance

A. I. Levterov, D. P. Labenko

Анотація


At present, the automated systems of strain monitoring (ASSM) are in demand; they are widely implemented and used in Ukraine and abroad. The aim of this paper is to determine the most effective methods and measuring systems to monitor the strains of bridge components and bridge clearance. On the basis of the application of optic methods and systems to measure bridge structure strains and the principle of laser beam sweep in horizontal and vertical planes, this paper describes the devices, which are designed by the authors of the article, to monitor bridge structure strains and bridge clearance that can be used in the ASSM. The proposed devices have a laser (laser diode) that permanently radiates a beam in an infrared (IR) range of a certain wavelength. An optical collimator and a scanning unit to radiate a laser beam towards photodetectors, which are fixed on a bridge span girder, are installed sequentially with a laser. It guarantees the parallelism of a laser beam. The laser, optical collimator and the unit of laser beam sweep are installed on a platform that is fixed on a step motor shaft at a certain distance from a bridge. The laser beam sweep unit, which uses the programmer of the step motor control unit, turns the shaft and the platform one-step (angle) further. The step motor is a mass production motor having a step of 0.90 or 1.80. A laser beam, which sweeps vertically, sequentially runs through all the n photodetectors, which are fixed on a bridge span girder, and the n photodetectors, which are fixed at a certain distance from the bridge in the same plane as the n photodetectors on the bridge span girder. The time span of a beam moving from one photodetector to the other photodetector corresponds to the length of a bridge clearance; the difference between the time of laser beam moving from one photodetector to the other photodetector without bridge strain and with bridge strain determines the value of a bridge structure strain. The described devices can be used in the ASSM; it enables us to effectively monitor the state of a bridge structure, shift and buckling that take place as a result of natural and climatic effects, intensive traffic as well as in cases when trains and aircraft apply large dynamic loads. 


Ключові слова


strain monitoring of bridge structure; bridge clearance; optical scanning system; laser; collimator; photodetector; step motor

Повний текст:

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Посилання


Deformatsionnyi monitoring mostov. Znachenie i zadachi [Bridge deformation monitoring. Meaning and tasks]. 2015. URL: https://www.icentre-gfk.ru/article/ a_def_mon_bridges.htm [in Russian].

Avtomatizirovannyi deformatsionnyi monitoring – innovatsionnye tekhnologii na sluzhbu obespecheniia bezopasnosti v gornodobyvaiushchei, neftianoi i gazovoi promyshlennosti [Automated deformation monitoring – innovative technologies to provide safety in mining, oil and gas industries]. 2010. URL: http://www.gfk-leica.ru/pyblikacii/ avtomatizirovannyi_deformacionnyi_monitoring__innovacionnye_/ [in Russian].

Redchenko V.P. Dynamichni vyprobuvannia mostiv. Chastyna 2: vilni kolyvannia, modalnyi kontrol [Bridge dynamic test. Part 2: bree oscillations, modal control] / Dnipro: Porohy, 2017. 216 s. [in Ukrainian]

URL: https://diman7777.livejournal.com

URL: http://autoass.ru/dorozhnye-znaki/ 3-13-ogranichenie-vysoty.html

Volokonno-opticheskie datchiki. Vvodnyi kurs dlia inzhenerov I nauchnykh rabotnikov [Fibre-optical detectors. Introduction for engineers and scholars] / Pod red. E. Udda [ed. E. Udd]. Moscow: Tekhnosfera, 2008. 520 s.

URL: http://www.electronics.ru/journal/ article/692

Gitis Eh.I. & Piskulov E.A. Analogovo-tsifrovye preobrazovateli [Analog-digital converters]. Moscow : Energoizdat, 1981. 360 s. [in Russian].

Pat. 134607 Ukraine. Measuring system to monitor strain of bridge, overpass components and bridge clearance. 27.05.2019.


Пристатейна бібліографія ГОСТ


1. Деформационный мониторинг мостов. Значение и задачи. 2015. URL: https://www.icentre-gfk.ru/article/ a_def_mon_bridges.htm.  2. Автоматизированный деформацион-ный мониторинг – инновационные технологии на службу обеспечения безопасности в горнодобывающей, нефтяной и газовой промышленности. 2010. URL: http://www.gfk-leica.ru/pyblikacii/avtomatizi-rovannyi deformacionnyi monitoring __innova-cionnye_/  3. Редченко В.П. Динамічні випробування мостів. Частина 2: вільні коливання, модальний контроль. Дніпро: Пороги, 2017. 216 с. 4. URL: https://diman7777.livejournal.com 5. URL: http://autoass.ru/dorozhnye-znaki/3-13-ogranichenie-vysoty.html 6. Э. Удд.  Волоконно-оптические датчики. Вводный курс для инженеров и научных работников. Москва: Техносфера, 2008.  520 с. 7. URL: http://www.electronics.ru/journal/ article/692 8. Гитис Э.И., Пискулов Е.А.  Аналого-цифровые преобразователи. Москва: Энергоиздат, 1981. 360 с.  9. Пат. КМ 134607 Україна. Вимірювальна система для моніторингу деформацій мостових споруд та підмостового габариту. Опубл. 27.05.2019.