Where thrust-boring, pipe jacking or directional drilling is used for utility crossings, it’s often required that rails/roads/buildings are monitored for settlement or movement before, during and after any construction activity takes place within the zone of influence.
- Movement/settlement tolerances?
- Reporting Interval?
- Manual or Automated?
Reflective retro targets are usually used to identify monitoring points and the surveyor takes every observation manually.
- Usually just one instrument
- Retro targets may be used
- Surveyor required on site
- Reports filled manually
Automated monitoring is usually more cost effective where continuous or 24-hour monitoring is required.
- May require multiple instruments
- Prisms required for all monitoring points
- Observations fully automated
- Reports generated automatically