When it applies
- Buildings adjoining a basement excavation.
- Towers under construction (verticality).
- Retaining walls, embankments, fills.
- Dykes, basins and reservoirs.
The principle
Targets and benchmarks fixed on the structure are measured from points located outside the zone of influence. A first series sets the zero epoch; each campaign is compared with it and with the previous one.
Our work
- Programme. Targets, frequency and thresholds set with the design office.
- References. Stable pillars or benchmarks, checked at each campaign.
- Zero epoch. Repeated initial measurements.
- Campaigns. Total station for displacements, direct levelling for settlement.
- Sheets. Deviations per point, comparison with the thresholds, immediate alert if exceeded.
The land surveyor measures and qualifies the movements; their structural interpretation is the responsibility of the design office and the project management team.
Examples of assignments
- Buildings adjoining a basement
- Cracked building
- Tower under construction
- Retaining wall
- Load test
What you receive
- Target plan
- Monitoring sheets per campaign
- Trend graphs per point
Reference framework
- ONIGT (National Order of Surveying Engineers) Standard 10, Article 2.5
- Decision No. 68/98/ONIGT/CN
Where we work
Based in Casablanca (Aïn Sebaâ), the firm carries out this service throughout Morocco: Greater Casablanca, Rabat-Salé-Témara, Fès, Tangier, Agadir, the Oriental and the South. Its survey crews travel to the site for the duration of the assignment.
Frequently asked questions
How often?
According to the programme: more frequent during sensitive phases.
What accuracy?
The method is chosen so that the uncertainty remains well below the alert thresholds.