SU1379630A1 - Device for determining a shift - Google Patents

Abstract

The invention relates to engineering surveying and improves the accuracy of determining displacements by reducing the effect of errors due to the torsion of the deformation sign. In the device, a linear element, made in the form of an invar wire 5, is rigidly connected to the bearing 14 of the deformation sign 13. The transverse displacement of the wire 5 relative to the base 1 of the reference sign 2 is fixed by the measuring unit, which is an equal-arm lever, whose axis 12 is fixed on the supporting 2. The small arm 11 of the lever is rigidly connected to the wire 5, and the large arm 10 to the reading unit sensor 9. The magnitude of the longitudinal shear of the wire 5 is determined by the measuring device 8 of the recording unit 3 fixed to the reference sign 2. 1 (L

Description

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The invention relates to the field of engineering geodesy, namely to measurement technology.

The aim of the invention is to improve the accuracy by reducing the effect of errors due to the torsion of the strain gum.

The drawing shows a diagram of the proposed device.

The device consists of a base 1 in the form of a metal plate mounted on the reference geodesic mark 2. On the base 1, the longitudinal shear ujioK 3 and the transverse shear block 4 are placed. The recording unit 3 of the pro ii, onb} ioro shift consists of a string 5 made of a material with a low linear expansion coefficient, for example, Invar, a string loading unit 6 with a weight of 7, and an iioi o meter 8, for example, capacitive, h, measuring the linear displacements Hjm of the dial gauge. The transverse shear adjustment unit 4 includes a linear displacement sensor 9, for example, an inductive lever having a large arm 10 and a small arm 11 h connected with a string 5. The lever rotates on an axis 12. The string 5 SEC defines a reference geodetic sign. with a deformation sign 13. To eliminate the influence of the deformation of the deformation sign on the measurement of shifts, it is equipped with a bearing 14. The inner bearing race is fitted coaxially with the deformation sign. The string 5 is attached to a freely rotating bearing housing 15.

The device works in the following way.

The string 5 is held together with the deformation sign 13, placed on block 6 and tensioned by the weight 7. The small lever arm 11 and the block 3 of the longitudinal shift registration are also connected to it. When moving the deformation sign 13 with the help of measure10

where 1 1

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so that the end of the large arm 10 is displaced by an amount and fixed by sensor 9, it is necessary to comply with the requirement expressed by the following equality when making the mark. 1 a G is the length of the string;

string length from the coupling point with a small lever arm to the tensioning device; the length of the large lever arm; the length of the small lever arm. If we know the magnitude of the longitudinal and transverse shifts, we use the well-known mathematical formulas to go to the new values of the coordinates of the deformation sign.

The proposed device for determining displacements should be used to measure the shifts between the reference and deformation marks, to determine the shifts in the process equipment, as well as to determine the mutual displacements of the geodetic signs and equipment. Studies of prototype devices of the device showed that the accuracy of measuring 30 longitudinal and transverse shears is characterized by a standard error of 20–30 µm. The distance between the geodesic marks can reach several tens of meters, which is quite enough to determine the deformations of the geodetic marks of the supporting networks created inside the engineering and twosteel structures.

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Claims (1)

Invention Formula An apparatus for determining displacements containing the reference and deformation- oHHbtfi signs associated with a linear element, and blocks measuring the longitudinal and transverse shifts with the reference nodes, characterized in that, in order to improve accuracy by reducing the effect of errors, The tool 8 is determined by the values of the torsion-distorted strain of the longitudinal shear t. sign, it is equipped with a bearing. The transverse shift is determined by the transverse displacement detection unit in the following way. With the transverse displacement of the deformation sign 13 from the initial position by the value of d, the string 5 at the point of contact of the small arm 11 is displaced relative to 55 fixed on the deformation sign coaxially with it and rigidly connected with a linear element made in the form of an invar wire, the measurement unit of longitudinal shears is fixed on the reference sign, the measurement unit of transverse shears is made in the form where 1 1 but so that the end of the large arm 10 is displaced by an amount and fixed by sensor 9, it is necessary to comply with the requirement expressed by the following equality when making the mark. 1 a G is the length of the string; string length from the coupling point with a small lever arm to the tensioning device; the length of the large lever arm; the length of the small lever arm. If we know the magnitude of the longitudinal and transverse shifts, we use the well-known mathematical formulas to go to the new values of the coordinates of the deformation sign. The proposed device for determining displacements should be used to measure the shifts between the reference and deformation marks, to determine the shifts of the technological equipment, as well as to determine the mutual displacements of the geodetic signs and equipment. Studies of prototypes of the device have shown that the accuracy of measurement of the 0 longitudinal and transverse shears is characterized by a standard error of 20–30 µm. The distance between the geodesic marks can reach several tens of meters, which is quite enough to determine the deformations of the geodetic marks of the supporting networks created inside the engineering and twosteel structures. 0 five 40 Invention Formula 55 fixed on the deformation sign coaxially with it and rigidly connected with a linear element made in the form of an invar wire, the measurement unit of longitudinal shears is fixed on the reference sign, the measurement unit of transverse shears is made in the form wasp nova 1 by the value of (f. for that. raznoplechey lever, whose axis 313796304 located vertically and secured with a wire, and large - with on the reference sign, the small shoulder is a rigidly corresponding readout node.