Monitoring Surveys

Are used to optically measure the movement of points on a structure in one or more dimensions.

Total Station Surveys

  • Are used to accurately measure the three dimensional location and movement of survey points.
  • Typically used for monitoring buildings during excavation of tunnels or shafts, and to assess the stability of dams, embankments and rock faces.
  • Surveys can be conducted manually, or automated total station networks can be set-up to automatically take readings from survey prisms.
  • Readings will accurately give the location of each point in three dimensions, from taking additional sets of readings the movement of the point in three dimensions can be calculated.
  • Points can easily be added or removed from the survey network.
  • The system is optical so relies upon a line of sight between the total station and the survey points.

Precise Levelling

  • Is used to accurately measure the vertical movement of survey points.
  • Typically used for monitoring buildings and utilities during tunnel or shaft excavation, dams, and embankments.
  • Precise levelling is undertaken manually.
  • Readings will accurately give the vertical height of each point, and from taking additional sets of readings the vertical movement of the point can be calculated.
  • The system is optical so relies upon a line of sight between the level and the levelling points.

Convergance Monitoring

  • Is used to measure the displacement between two points on a structure.
  • Typically used for monitoring tunnels and shafts, retaining walls and abutments, structural movement, quarry and mine excavations, and dams.
  • Readings are undertaken manually using either a tape extensometer, or a laser distance meter.
  • Data obtained will give the distance between the two points, and from taking additional sets of readings, the movement can be calculated.