Total Station Traverse Measurement Instrument Workshop, Theodolite Traverse Measurement is used to establish measurement control below the fourth grade. Traditional theodolite traverse measurement is to directly measure the distance with an Invar ruler or steel tape measure, and use a theodolite to observe the angle. This type of wire is necessary for all kinds of scales, especially large-scale mapping. When surveying railways, highways and canals, it is necessary to lay the backbone theodolite traverse along their axis. In urban surveying, short-sided theodolite traverses must be laid along the street due to the shady area formed by the building complex. With the development of electromagnetic wave ranging technology, most of the theodolite wires are laid with electromagnetic wave rangefinders, and the application of traditional theodolite wires is becoming less and less.
Parallax traverse measurement and line-of-sight traverse measurement completely adopt optical method, use parallax method and line-of-sight method to measure the length of the wire side, do not need to use the invar ruler or steel tape measure measurement, so it is more convenient than the traditional theodolite traverse measurement, and has higher flexibility, but the accuracy is lower.
Compared with triangulation, the advantages of traverse measurement are flexible layout, less direction of sight, direct determination of side length, and uniform roughness. The disadvantage is that the control area is small and there is a lack of effective and reliable verification methods.
The total station is set up.
1. The total station is placed on a control point (measuring station), leveled and centered, and another control point (rear view point) is prismed
2. Press the Menu button, press F1 (Data Collection), enter the coordinates of the measuring station and the height of the instrument, and click Next
3. Enter the coordinates of the backsight point.
4. The instrument aims at the prism and clicks to measure. There are three options for measurement: angle, distance, and coordinates. If you select a measured coordinate, you can determine whether there is any error or error by comparing the measured coordinates with the coordinates of the backsight point. After the comparison, if the gap is not large, the orientation is completed. If the difference is large, check the point coordinates, points, etc., and then repeat the steps.
The mirror technician erects a prism at the feature point of the terrain and features, and must tell the instrument operator the current prism height through the intercom;The instrument operator enters the prism height, points to the prism, clicks to measure, and saves the coordinates. The draftsman or mirror artist draws a sketch (or the instrument operator prepares a point ** or changes the point number according to the terrain features) to clarify the relationship between the feature points of the terrain features. After the mapping is completed, the data is exported and plotted with CASS.
Note that the actual prism height is the same as the input prism height;The instrument is de-energized and needs to be redirected;Set up to two stops for points that you can't see.
Lofting method: according to the known two coordinate points to the total station orientation, and then enter the coordinates of the point to be placed, the total station will display the angle and distance, you rotate the total station, so that the display angle is close to zero, and then take the prism along the lens to point the displayed distance, use the total station to aim at the mirror, point measurement, look at the angle and distance error of the display, and constantly adjust. The distance error is 1-2mm, and the angle difference is +-(1-2) seconds. The above content is sorted out according to the problems encountered by students in their actual work, for reference, if there are any problems, please communicate and correct them in time.
What knowledge points do you need to master in measurement training? Courses including measuring instruments, surveying software, and surveying data, among which the more important ones are the application of total station and RTK in the construction process, as well as the calculation of earthworks and coordinates in the software course, etc., if you need to know more comprehensive courses, please consult Mr. Chen of the Eastern British Times!
Main training: engineering surveying, surveying and mapping, cost, construction, data skills, academic qualifications, technician certificates, etc. School surveying includes building surveying, road and bridge surveying, tunnel surveying, mine surveying, topographic surveying, cadastral surveying and real estate surveying, etc. Single-learning total station and single-learning GPS-RTK can also be learned. Instrument courses: total station, theodolite, level, GPS-RTK and other practical training courses.
Practical training, cross-listening, focusing on practical operation ability, and being able to operate independently after learning until you learn.
Training Center: Chengdu Dongying Times Training School (the school is open to national enrollment and can be accommodated).
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