How to Use a Handheld Laser Rangefinder Under Mine
The application in the mine mainly uses the combination of DISTO and the domestic theodolite to form a non-prism half-station instrument, which is used in the underground stope to measure the point position, section height, stope volume, etc.
Before a certain unit purchased the DISTO handheld range finder, what was the original downhole measurement method? According to the person in charge of the measurement unit: they used theodolite, tape measure, fishing rod and domestic pulse range finder, etc. Conduct downhole stope surveys. The main disadvantages of this approach:
1. Low measurement accuracy. There is a set of data to prove it; at the end of 1998, two geological survey groups jointly measured the volume of a stope, and the result was 55,000 cubic meters for one group and 68,000 cubic meters for the other group. Measure one measurement value at a time, and the difference between several measurement values is very large, so I dare not continue to measure again.
2. Slow speed and low efficiency. The underground working environment cannot be compared with the ground environment at all. Due to the limitations of poor underground conditions, dark light, and low precision coefficient, the measurement speed is very slow and the efficiency is also very low. Often, a measurement point costs several times more than the usual measurement. time.
3. Although the domestic pulse-type handheld rangefinder can also measure distance, because it is ultrasonic distance measurement, people cannot see the position of the target point. In addition, the measurement range is too short and the accuracy is low, which greatly limits its scope of use.
Changes after using DISTO:
In the underground measurement, the surveyor only needs to set up a theodolite and a range finder, and the target point does not need to be stationed, and the measurement task can be completed smoothly, accurately and accurately in a short time, overcoming the In the past, the disadvantages of slow speed, low efficiency, poor accuracy, etc., especially the advantage that the hand-held laser range finder can see the red laser point in the downhole measurement, are particularly praised by the surveyors. The hand-held laser range finder can also be used alone in the downhole measurement, which is quite convenient and can store a large amount of measurement data without the need for downhole measurement records. In addition to being convenient to use underground, the handheld laser rangefinder can also be used for open-air slope measurement and stakeout.
