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Point-to-line (dot projection) measurements
This function is used to measure the length of the prism point from the start of the baseline (x), the distance of the prism point from the baseline (y), and the height difference (z) from the starting point of the baseline.
The preparation before the measurement is to set the definition of the instrument height and target height and baseline. The input of instrument height and target height is not described here.
Baseline definition: In the point projection interface, select 2Set Baseline" to enter the window of selecting a method to set baseline points.
Retrieve the baseline point
When pressing the [2] key to select the baseline point, enter the input or call point window, as shown in the figure, you can press the [Input] key to enter the coordinate point, or you can press the [Retrieve] key to retrieve the coordinate point, and press the [Confirm] key to enter the coordinate input at the end of the baseline after completion, the method is the same as the starting point, and return to the menu after completion.
Measure the baseline point
In the point projection menu, press the [1] key to enter the "Point Projection (Starting Point)" window, press the [Measure] key to start ranging, after completing the ranging, press the [Confirm] key to enter the "Point Projection (End)" window, and press the [Measure] key to start ranging. After the ranging measurement is complete, press the [Confirm] button to end the main screen of baseline definition return point projection measurement, and select "3.".Point projection measurement is now available.
Point projection measurements
In the point projection menu, press the [3] key to enter the "Point Projection-Measurement" window, press the [Measure] key to start the ranging, and after the ranging is completed, the deviation length (x), offset and deviation height difference (Z) of the point to be measured on the baseline can be displayed.
Press [F4] (to turn the page) where the Elevation key is used to re-enter the target height, and the Page Turn key is used to select whether x, y, z, or the flat, skew, or height difference of the measurement point are displayed.
Application of point projection method in foundation pit deformation monitoring
Horizontal displacement monitoring is an important and necessary content of foundation pit deformation monitoring, and the direct application of point projection method on the total station has brought great convenience to the horizontal displacement monitoring of foundation pit.
(1) Save time in the field observation
Due to the special working environment of foundation pit monitoring, the shading, vibration and hot weather of construction machinery in the monitoring process, shortening the field observation time can improve work efficiency, improve the accuracy of monitoring, and also reduce the pressure on operators.
(2) Improve the efficiency of internal processing
In-house data processing is a repetitive and trivial process, and it is necessary to be cautious and careful. In particular, due to the large amount of monitoring data, it is necessary not only to carry out various adjustments and other processing of the original data, but also to make various results tables and curves, and to analyze its change trend and reasons, which cannot be mistaken. The use of point projection method can effectively solve the problem, the use of point projection method for field monitoring, after the establishment of the datum, directly observe the monitoring point, that is, the required displacement can be obtained, and the displacement can be obtained by subtracting it from the last time, and the cumulative displacement can be obtained by subtracting it for the first time, and the internal processing is convenient, fast, and not easy to make mistakes.
(3) The deformation reaction of the foundation pit is more intuitive
The horizontal displacement monitoring of the foundation pit is mainly to reflect the change of the foundation pit by the change of the monitoring point, because the monitoring point will be arranged around the foundation pit, then for a certain monitoring point, we only need to get the change in the direction of the edge of the foundation pit where it is located, and for the variables in other directions, it is of little significance to the foundation pit monitoring. Therefore, the use of other methods of measurement, but also for internal processing, and the use of point projection method can be convenient and quickly to get the data we want, and can intuitively reflect the changes of the foundation pit, so as to better achieve the purpose of monitoring.