A.A. Averin1, D.S. Gorkin2, V.V. Varenkov3, V.I. Sahterov4

1−4 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (Troitsk, Russia)

To determine the length of a pile in the ground, devices are used based on measuring the propagation time of an acoustic signal that occurs during impact on an object. The disadvantage of the method: such devices work only at the time of driving the pile. Also known is a method for measuring the length of reinforcement using a georadar in a reinforced concrete pile as a non-destructive contact method. It requires a mandatory electrical connection to the fittings, which is not always possible. Therefore, in cases of mandatory non-destructive testing, this method is not applicable. A new method for controlling the length of electrically conductive piles using pulsed georadar has been created. This method measures the length of an electrically conductive pile by fixing the difference in the time of passage of the direct signal of the emitted pulse through the air and in the pile. Then, the dielectric constant of the electrically conductive pile is calculated. The pile length is calculated based on the obtained dielectric constant and the propagation time of the reflected signal from the end of the pile. The experiments carried out showed the possibility of measuring in different ways. The generator is located at the beginning of the pile, and the receiver moves along the pile. It is also possible to measure by moving the generator and receiver fixed by the frame. Each method has its own characteristic representation of the received data. The choice of method depends on the conditions of the measurements. For specific measurements, it may be necessary to change the design of georadar antennas The developed method makes it possible to carry out non-destructive non-contact measurement using existing georadars. Further work is required on the development of a specialized device and the development of methods for measuring various types of electrically conductive piles.

Averin A.A., Gorkin D.S., Varenkov V.V., Sahterov V.I. Contactless method of measuring the length of electrically conductive piles. Radiotekhnika. 2023. V. 87. № 9. P. 88−95. DOI: https://doi.org/10.18127/j00338486-202309-08 (In Russian)

1. Bud'ko V.B., Butyrin A.Ju., Grunin I.Ju., Morozov P.A., Kopejkin V.V., Makeev A.V., Gorkin D.S. Georadiolokacionnyj metod nerazrushajushhego kontrolja pri reshenii jekspertnyh voprosov, svjazannyh s ustanovleniem dliny zhelezobetonnoj svai v fundamente zdanija. Teorija i praktika sudebnoj jekspertizy. 2010. №1 (17). S. 200-224 (in Russian).
2. Popov A.V., Prokopovich I.V., Edemskij D.E., Morozov P.A., Berkut A.I., Merkulov S.V. Glubinnyj georadar: principy i primenenie. Jelektromagnitnye volny i jelektronnye sistemy. 2018. T. 23. № 4. S. 28-36 (in Russian).
3. Matveev B.K. Jelektrorazvedka, M.: Nedra. 1990. S. 31-32 (in Russian).
4. Volkomirskaja L.B., Gulevich O.A., Varenkov V.V., Reznikov A.E., Sahterov V.I. Sovremennye georadary serii «GROT» dlja jekologicheskogo monitoringa. Jekologicheskie sistemy i pribory. 2012. № 5. S. 3-5 (in Russian).
5. Wu T.T., King R.W.P. The cylindrical antenna with nonreflecting resistive loading. IEEE Trans. Antennas Propag. 1965. V. 13.
   № 3. P. 369−373.
6. Shilin A.N., Shilin A.A., Artjushenko N.S. Raschet pogreshnostej reflektometrov dlja monitoringa linij jelektroperedachi. Kontrol'. Diagnostika. 2015. № 9. S. 52-59.
7. D'jakonov V. Reflektometrija i impul'snye reflektometry. Komponenty i tehnologii. 2012. № 1. S. 164-172 (in Russian).
8. Volkomirskaja L.B., Varenkov V.V., Gulevich O.A., Pushkarev V.A., Reznikov A.E., Sahterov V.I., Sherstnev A.V. Issledovanie voronki na poluostrove Jamal 10 nojabrja 2014 g. georadarami GROT 12 i GROT 12n. Materialy konf. «Osvoenie Arktiki – novyj vitok v razvitii otechestvennoj nauki i innovacij». Nauch. vestnik Jamalo-Neneckogo avtonomnogo okruga. 2015. № 2(87). S. 81-89 (in Russian).
9. Radiotehnicheskij pribor podpoverhnostnogo zondirovanija (georadar) «Oko-3». Universal'nyj bazovyj komplekt. Tehnicheskoe opisanie. Instrukcija po jekspluatacii. OOO «Logicheskie sistemy». Rossija, Moskovskaja oblast'. 2018 g. https://www.geotech.ru/ (in Russian).
10. http://www.geoscanners.com
11. Svidetel'stvo o gosudarstvennoj registracii programmy dlja JeVM № 2023663673 ot 27.06.2023 g. Nazvanie: MATRIX. Gorkin D.S., Varenkov V.V. (in Russian).