Shanghai Geotechnical Engineering Investigation Design & Research Institute Co., Ltd., referred to as "Shanghai Geotechnical Institute", also known as "the exploration and hospital." The "House on the exploration and" It's three words have been carried out by trademark. Principally engaged in rail transportation, and other care high-precision deformation monitoring related to survey work. maglev rail include light rail, subway.

       As a result of the particularity, at present, we are monitoring the outer rail transportation industry, are basically in the evening between 24:00 ~ 3:30 am more than three hours to complete. In the use of optical water level, due to eye fatigue, on-site allowable error index calculation and other reasons, accuracy and speed is difficult to meet our requirements, but generally require 6 people / groups: one person observation, 1 record, 2 Fu-foot, 2 lamps. So, will the use of electronic water level to become the first choice of our work.

       Rail subsidence monitoring is particularly high measurement precision, the general changes in sedimentation rate greater than 0.5mm / d is necessary to alarm. Automated monitoring while to achieve time and accuracy requirements, but it costs too much, made it impossible to completely replace manual measurement methods . Through comparison and analysis, with the idea of try, we are in June 2008, from the Haibo Shi Instrument Co., Ltd. bought the first Leica DNA03-type electronic level. in the use of a month later, has also bought 4 sets DNA03 electronic water level, a total of 5 sets of Leica DNA03 electronic water level, is mainly used in rail traffic monitoring subsidence monitoring project.

1, equipment, advanced technology, excellent service

     1.1 The high accuracy

      Using correlation measurements, reached 0.3mm/km accuracy, the smallest reading shows up to 0.01mm. From the company has completed the statistical results of actual measurement, closed poor and its accuracy is very good.

      1.2 photosensitive ability

       Especially applies to our measurement of the MTR custody, under normal circumstances, at night, two-foot level, just a member of standing lamps near the equipment, we can satisfy the lighting conditions, and the measurement speed was quite fast. Such a level of teams and groups only need one human observation, 2 Fu-foot, one person will be able to conduct operations according to Light. Our data are largely outside the industry, collected at night, DNA03 superior ability to give us sensitive data acquisition saved a lot of time and labor costs. Practice shows that, compared with traditional water level, using Leica digital levels can save nearly 30% of working time, and data stable and accurate. and I units of the standard of another electronic device compared to the same 2km lines, 300 measuring points, the time savings of approximately more than 1 hours and staff to save a person.

       1.3 good lighting conditions

       Circular bubble with lighting functions in normal times provide a great convenience for the whole. The screen can be set to automatically turn off lighting; uniform backlighting large-screen, from any point of view very clear. For the night-time measurement of convenience.

       1.4 All Chinese display

        Operate smoothly, are familiar with the process quickly. For the current first-line measurement of the reality of persons with poor English to provide a great convenience.

       Before and after the line of sight to facilitate adjustment of 1.5

        In the standard line measurement process, the cumulative difference before and after the line of sight and the line length directly shown to facilitate the measurements outside the industry to adjust before and after the line of sight.

        1.6 instrumental internal temperature display function

         The temperature is easy to see instruments in line with the external environment, reducing the temperature errors caused by inconsistent effects.

        1.7 software features a more complete

         Leica Geo Office Office software (LGO) software with the data exchange management, software upload, the output data format and management functions. In particular, the data output format can set the standard of measurement of optical imaging outside the industry, book in hand, as shown, while the output device number, date, temperature, adjustment methods, etc. you want the output of any relevant data and format. To collate the data within the industry has brought great convenience.

  2, DNA03 in use in several engineering problems and the corresponding approach.

      a, native instrument data output format is too simple, not practical

      Approach: Using Leica localized leveling network adjustment software that can output data report required by national regulation.

      b, adjustment calculations, as a JOB which there are different lines for adjustment, the output results are often arbitrary strings with each other.

      Approach: different lines in different JOB inside, but the number of instruments is limited to the JOB, the line for a long time to prepare a special format file can be resolved.

      c, night, a ruler can not measure the light too.

      Approach: The low-light and light as far as possible away from the ruler and change the angle of irradiation.