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The geodesy methods of estimation of displacements of girders
Konferencja
V Konferencja Naukowa Rzeszowsko-Lwowsko-Koszycka Aktualne problemy budownictwa i inżynierii środowiska, Rzeszów, 25-26 września 2000. Cz.1. Budownictwo
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Abstrakty
The paper presents, elaborated by the authors, new method of measurement using DISTO tool. Geodetic measurements of displacements of objects, and among them of girders and of foundations are realized with method of geometrical levelling for determinations of vertical composition. The work introduces the analysis of select methods of measurements together with utilization obtained of conclusions in practice. The paper presents choice of methods of measurements and initial analysis of errors. Problem of choice of method of measurements has fundamental meaning for correct determinations of composition displacements of points of objects estaminated with recommendation passed expertises. Taking under attention limited accesbility to points of object resulting from local conditiones, one should for every chance to effect of theoretical analysis of possibities of use of different methods of measurements and of tools. Choice of methods of measurements comes out of realization of tests of use of different measuring - technics on building site in period of previous realizations of all assignments. Points are divided on groups favouring these, for of which one should mark compositions of horizontal displacements, vertical composition and their location on foundations or on girders. Initial estimation of conditions of work permited on choice of manners of determination of compositions displacements for every group of control points. Control points should be seated at surface of maximum foreseened displacements. Measuring positions - can be situated at will, under conditions, that are found oneself in vicinity vertical surfaces containing these two control points. Error of measurement of length of section can be estaminated from deviations from average values from series of observation on position and similarly as in case of vertical displacements from function d=f(Delta). Determination composition horizontal comes down to calculation of difference of length of section. Submiting that we allow difference, delta d<0.1 mm and ds<05 m, value of angle has to to be well known with error dBeta < 60cc. Enlargement discenter, ds = 2.00 m, will cause significant enlargement of requirements of exactitude of measurement of angle (+ -15cc). Obtainment required exactitudes of measurement is not stateing, in this example, no problem. Section junctive points are approximately parallel to axis of beams of girders. Measurement lengths these of sections are executed at use of electronic total - station SET6E. Proposed methods of marking of displacements on the base of changes of length of sections this can be use in practice under condition that assurance of simultaneously of inspection of constancy of points of system of reference. Obtained results are completely sufficient for builder's expertise. Results effects of analysis have meaning practical and economic, and they can be of service to optimization of technology of geodetic measurements. Utilization popular and easily accessible tool, which is DISTO, to marking of vertical compositions of displacements and of electronic total - station to marking composition horizontal considerably simplifies course of measurements, shortens time of execution. Use of DISTO to determination of vertical displacements is well-founded when height of points over hall's floor (h>5 m).
Rocznik
Tom
Strony
109--116
Opis fizyczny
Bibliogr. 7 poz.
Twórcy
autor
autor
autor
- Politechnika Rzeszowska, Wydzial Budownictwa i Inżynierii Środowiska
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BTB2-0049-0021
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