Method of monitoring the stability of reference points

 

(57) Abstract:

Usage: when observing the stability of the vertical position of benchmarks intended to make in the nature of design elevations of points, observations of subsidence structures and in other cases, the engineering and surveying practice. The essence of the method is that the stability of the position of the main frame is measured by the results of the observation hive of the three auxiliary reference points (BP), with the same design and conditions of pledging located so that the excess above the main frame (RR) was measured with one station at equality shoulders and distance from the ground to the target beam is not less than 0.3 m, and the stability of the EO is assessed by comparing the excess auxiliary frames on the main frame and, if the excess of each BP PRS same from cycle to cycle, it shows the stability of the auxiliary frames, the main rapper is experiencing vertical movement by an amount equal to the average excess in this cycle, taken with opposite sign. Technical result: improving the quality of geodetic measurements by excluding from them the factors of the external environment and the uncertainty is and can be used for the observation of the stability of the vertical position of the reference points, intended to make in the nature of design elevations of points, observations of subsidence structures and in other cases, the engineering and surveying practice.

The prototype is copyright certificate G 01 5/00 SU 1800263 A1 (Y., Sokolov, Kuban agricultural Institute). The essence of the invention is that when the dimension is exceeded, use the rake is made with vertical mirror surfaces, and level with a vertical scale attached to the lens, and after removal of each of samples a1and a2removed additional counts 11and 12the images of the vertical scale, formed by a mirror surface of the respective rail. The advantage of our method is that, excluding the impact of environmental factors and errors of observation affecting the stability of the position of a reference point, the quality of the geodetic measurements.

The technical result of the invention is to improve the quality of geodetic measurements by the exclusion of these environmental factors and errors of observation affecting the stability of the position of the marker.

In Fig.1 is a diagram of the observation; Fig.2 - caesa is the stability of the position of the main frame (RR) is determined by the results of the observation hive of the three auxiliary reference points (BP), with the same design and conditions of burial. The stability of the position of the marker is determined by comparing the excess BP over the PR.

Let hOh,iand hk,i- measured excess BP over the PR in elementary and k-m cycles of observations (i=1, 2, 3 - non frames). Formed by the difference

< / BR>
If the course change of the excess of each BP over the PR the same from cycle to cycle (Fig.2 to 5), this indicates that their position is stable, therefore, within the accuracy of measurements must comply with the equalityk,1k,2k,3and average excess

< / BR>
relative to the initial cycle of observations, taken with the opposite sign, means a change of this value marks the main rapper in k-cycle observations

< / BR>
As a BP, you can use metal frames - rods with a length of 1.8 m, laid below the freezing depth of soil and covered with a lid.

BP should be placed so that the excess over the PR can be measured with one station at equality shoulders, and the sighting beam must pass over poverhnostbyu h=a-b, whereby when the condition ma=mb=mconcerning.

When the observations on the two sides of the slats and at two horizons

< / BR>
For the difference of hk-ho= get

< / BR>
and its average value will be

< / BR>
Limit value when R=0,997 will be equal to

< / BR>
Error mconcerningconsists of the following main errors:

1) myin the countdown because of the inaccuracy of the installation axis level in the horizontal position my= 1,5d10-4;

2) mOCD- rounding of reference for rail

< / BR>
3) mi- reference from non-compliance with the conditions of the main leveling

< / BR>
4) mW- drawing tick marks on the rail (for RN mW=0.50 mm).

Taking in these formulas for N3 = 15, V=30xand t=10 mm (intercept Reiki), when the length of the sighting beam d=20 m and d0 will get

my=0.04 mm; mOCD=0,37 mm; mW=0,50 mm

The total mean square error mconcerningwill be equal to

< / BR>
Therefore

< / BR>
For experimental validation of the proposed method were organized observations on the outskirts of the city of Yoshkar-Ola (Ul. 3. Kosmodemyanskaya, 49) for oligomerizes point EP-2101, he's tall marker - spherical head Metheny, below the depth of soil freezing, three metal marker rod (BP) in length 1.8 m: RUN1 and VR on the edge of the woods in 2-4 m from the carriageway urban roads; BR - on the edge of the clearing. Design BP is given in [1].

For observations used level H3 and 1.5-meter rail RN equipped with hard plumb. Observations were carried out from a permanent station on both sides of the rail when the two horizons of the instrument. The observations are tabulated and shown in Fig.2 - 5.

The obtained results confirm the stability of the position of auxiliary frames, because in all cases |max-min|<3= 1,9 mm

The main rapper is experiencing vertical movement, seasonal in nature and may exceed the accuracy of geodetic observations, because in some cases

Literature

1. Shadrin A., To the question about the elements of the deformation structures and methods of geodetic observations of them. - Geodesy and aerial photography, 1990.

2. Methods and devices for high-precision geodetic measurements in construction/edited by C. D. Bolshakova. - M.: Nedra, 1976.

Method of monitoring the stability of reference points, including the definition of excess, in which the product, remove the samples andAnywayse observation hive of the three auxiliary frames - (BP), with the same design and conditions of pledging located so that the excess above the main frame (RR) was measured with one station at equality shoulders and distance from the ground to the target beam is not less than 0.3 m, and the resistance of the main frame (RR) is measured by comparing the excess auxiliary frames above the main frame, and if the excess of each BP over the PR the same from cycle to cycle, it shows the stability of the auxiliary frames, the main rapper is experiencing vertical movement by an amount equal to the average excess in this cycle, taken with the opposite sign.

 

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