The modern geodetic equipment allows observations as soon as possible, providing high accuracy and productivity. Achieving high accuracy of measurement is impossible without taking into account ...external factors that create influence on an observation object. Therefore, in order to evaluate an influence of thermal displacement on the results of geodetic monitoring a mathematical model of horizontal displacement of above-ground pipelines was theoretically grounded and built. In this paper we used data of experimental studies on the existing pipelines "Soyuz" and "Urengoy - Pomary - Uzhgorod". Above-ground pipeline was considered as a dynamic system "building - environment". Based on the characteristics of dynamic systems the correlation between the factors of thermal influence and horizontal displacement of the pipeline axis was defined.
Establishing patterns between input factors and output response of the object can be useful not only for geodetic control, but also for their consideration in the design of new objects. It was investigated that the greatest influence on the accuracy of geodetic observations can create dispersion of high-frequency oscillations caused by daily thermal displacement. The magnitude of displacement exceeds actual measurement error.
The article presents the results of calculation of high-frequency oscillations of above-ground gas pipeline.
The result made it possible to substantiate the accuracy and methodology of geodetic observations of the horizontal displacement of pipeline axes taking into account an influence of cyclical thermal displacement.
Research results were recommended for use in practice for enterprises that serve the main gas pipelines and successfully tested by specialists of PJSC "Ukrtransgaz" (Kharkiv, Ukraine) during the technical state control of aerial pipeline crossing in Ukraine and also can be used to form the relevant regulations.
Specifičnost nadziranja cjevovoda iznad zemlje zahtijeva brza daljinska mjerenja. U većini je slučajeva nemoguće postaviti reflektirajuću prizmu na građevinske elemente radi mjerenja udaljenosti. Ovi ...se zahtjevi mogu ispuniti primjenom geodetske mjerne stanice kojom se mjeri bez reflektora. U radu su uspoređeni rezultati procjene točnosti a priori i a posteriori za određivanje koordinata cjevovoda pomoću geodetske mjerne stanice bez reflektora Sokkia 530RK. U ovom istraživanju provedena su laboratorijska i terenska ispitivanja te rezultati mjerenja na postojećem plinskom cjevovodu (promjer cijevi 1420 mm). Rezultati eksperimenata pokazali su da vrijednost pogreške horizontalnih koordinata prekoračuje očekivanu pogrešku za upadni kut veći od 37°. Vrijednosti pogrešaka vertikalnog položaja točaka prekoračuju teorijski izračunate vrijednosti za upadne kutove veće od 33°. Provedena je analiza izvora pogrešaka pri određivanju udaljenosti s geodetskom mjernom stanicom bez reflektora. Dobivena jednadžba točnosti na temelju eksperimentalnih podataka omogućava nam da odredimo pogrešku mjerenja udaljenosti ovisno o udaljenosti i upadnom kutu.
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