What is the allowable deviation of total station coordinate lofting? , ask the master for help

Try to keep it within 3cm, total station.

The accuracy of lofting is relative accuracy, because the final acceptance is based on the room distance as a hard standard acceptance, the design room distance of more than 10 meters error does not exceed 10cm, within 10 meters of error does not exceed 5cm, so the higher the relative accuracy of lofting, the better, the most important thing is to control well in construction.

Total station measurement data. xy

The instrument parameters corresponding to the z-error are respectively.

Ranging. Horizontal angles.

Vertical angles. If your x is correct, it means that the instrument is no problem, and the y-axis is deviated, which means that the horizontal angle error of your instrument is large. That is, 2C is big, go to a professional store to correct 2C, if 2C is too big, it will affect the tricoax of the instrument.

It's best not to exceed one point. Yours is 80 centimeters off, if the distance is far enough, 2C is not much worse, if it is very close, it is estimated that 2C error is very large.

Zibo Zhaozhi Surveying and Mapping Instrument ****.

Factors affecting accuracy include human error, external environmental impact error, instrument error, etc. The human error at staking out is calibrated as 2

mm, the error is calibrated to 2 due to external factors

mm, the instrument alignment error is calibrated to 2

mm, the calibration variance can be obtained Calibration = 3·2

mm。Lofting is the formation of a complex 3D object by taking a 2D body object as a cross-section along a path. Different bodies can be given to different segments on the same path.

We can use staking to build a lot of complex models. In engineering, it is used to "move" the scheme on the drawing to the actual site.

Extended Information: Total Station Leveling and Bubble Correction Methods for Correct Leveling of Instruments:

1. Erection: Erect the instrument onto a stable tripod and tighten the center spiral.

2. Coarse flat: look at the round bubbles (the accuracy is relatively low, generally 1 point), and rotate the 3 foot spirals of the instrument respectively to roughly level the instrument.

3. Jingping: make the tubular level (or long bubble tube) on the alignment part of the instrument parallel to any pair of foot spirals, and rotate the two-foot spiral to center the bubble (it is best to use the left thumb method, that is, the left and right hands rotate the two foot spirals at the same time, and the two thumbs move in the opposite direction, and the left thumb direction is the same as the bubble movement direction of the bubble in the bubble tube.) ）.

Then, rotate the alignment part 90° and rotate the other foot spiral to center the long bubble tube.

4. Inspection: Rotate the instrument by 90°, if the bubble of the long bubble tube is still centered, it means that it has been leveled; If there is a deviation, repeat step 3. Normally, repeating 1 or 2 times will be fine.

Coordinate measurement: 1. Set the three-dimensional coordinates of the measuring station.

2. Set the coordinates of the backsight point or set the horizontal dial reading of the backsight direction as its azimuth angle. When setting the coordinates of the backsight point, the total station automatically calculates the azimuth of the backsight direction and sets the horizontal dial reading of the backsight direction to its azimuth.

3. Set the prism constant.

4. Set the atmospheric correction value or air temperature and pressure value.

5. The measuring instrument is high, the prism is high and input into the total station.

6. Illuminate the target prism, press the coordinate measurement button, and the total station will start to measure the distance and calculate the three-dimensional coordinates of the display measurement point.

Summary. Hello dear, I am happy to serve you: the allowable error of the coordinate lofting of the total station room is millimeter-level, in the range of plus or minus 4 mm.

Hello dear, I am happy to serve you: the allowable error of the coordinate lofting of the total station room is millimeter-level, in the range of plus or minus 4 mm.

Total station room safety, quality, cost and progress are the basic tasks and ultimate goals of all building management construction. The use of high-tech products has brought good news to construction workers. In the current housing construction, the use of tower crane has been quite mature, and it has also brought convenience to the construction in terms of safety, quality, cost and schedule.

In particular, it has brought a great improvement in the labor force to construction workers. And our hard-working construction technicians still use the original level and theodolite to carry out tedious leveling and pay-off work. The people in the construction of highway bridges have been freed from the original theodolite, avoiding tedious calculations, improving work efficiency, and significantly reducing the error rate.

In order to keep up with the pace of the times, promote the learning interest of on-site construction management personnel, and improve the efficiency and accuracy of pay-off, it is the best choice to use the total station in housing construction. Now the specific use of total station in housing construction, and what convenience it has brought to housing construction, make an analysis and comparison. Thank you for your patience, the above is my reply, I hope it can help you, I wish you a happy life.

The station is at a known point: Then start building the station, first enter the site coordinates, and then enter the coordinates of the rear sight point according to the root model prompt, align the instrument at the rear view point, and then press the ranging, and the station will be built after the measurement.

At this time, you should reverse measure the backsight point to see how much the measured backsight coordinates are different from the coordinates you entered, if it is within the allowable range, you can proceed to the next step of lofting.

Enter the coordinates of the lofting point according to the instrument prompt, and after the input, the general instrument will display the angle **distance***, which means that according to the input data instrument calculates the relationship between the point to be lofted and the station, regardless of him, and then press the key such as the extreme button or the next step, it will enter an interface where the horizontal angle will change, and the instrument will be turned to the horizontal angle data to be around 0 ° 0 minutes and 0 seconds, and then use the horizontal micro motion to adjust the instrument to 0 degrees 0 minutes and 0 seconds, which means that the point to be lofted is on this line.

Hello, a total station is a measuring instrument, and the bench is used to measure the horizontal and vertical coordinates of points on the ground. Relative coordinates refer to the fact that the coordinates of other points are represented as offsets relative to a point based on a point. Here are the detailed steps on the total station relative coordinate lofting:

1.Set a datum point: First, you need to select a datum point, which can be a point with known coordinates or some other fixed point.

Make sure that the coordinates of the point are accurate. 2.Establish a coordinate system:

Set a coordinate system on the total station, with the datum point as the origin. It can be operated using the coordinate system setting function of the total station. 3.

Observation of target points: Use the total station to observe the horizontal and vertical angles of other points to be measured. During the observation, ensure that both the level and the vertical meter of the total station are in an accurate horizontal state.

4.Calculate coordinates: Based on the observed angle and distance data, the horizontal and vertical coordinates of the target point relative to the reference point are calculated using the total station's built-in software or external calculation tools.

5.Correction error: When calculating coordinates, there may be some errors, such as instrument error, large terrain variation, etc.

You can use correction methods, such as the closure adjustment, to reduce these errors. 6.Label Coordinates:

The calculated relative coordinates are marked on the target point on the ground, which can be represented by a benchmark or other marker. 7.Verify measurements:

After the stakeout is complete, you can use the total station to re-observe some points with known coordinates to verify the accuracy of the measurements.

Find two points marked with coordinates on the drawing, close to the site to be lofted at one point when the test stands to erect the instrument, and the other point is the rear view erection prism. The three tripods of the total station stand above the measuring site, and the screws of the total station and the fixed instrument should not be locked too tightly, and the hollow position is basically aimed at the measuring station.

Enter the pre-calculated coordinates that need to be lofted, press to confirm that the instrument will display the angle and distance, click the extreme instrument to display the angle, release the steering button, rotate the instrument to the vicinity of the angle to zero, fix the steering, fine-tune the angle to zero the most, and let the helper put the prism in the direction where the lens of the instrument is aligned. After the lens sees the prism, press the range, The interface will display a value, + value will let the helper move forward in the positive direction of the instrument, and let the helper retreat until the value on the instrument is infinitely close to zero, The control error is within 3 mm. Press one point to enter the coordinates of the next point and repeat until the measurement is complete.