QMS/General/TBT-QMS-015

Settlement Monitoring Safety

Quality & Inspection › General › Settlement Monitoring Safety

Presenter		Project
Location		Date

Settlement monitoring measures ground and structural movement during construction to detect unsafe subsidence.
Monitoring is essential around deep excavations, piling, tunnelling, and dewatering operations.
Survey targets, levelling studs, and extensometers are installed on structures and in the ground for measurement.
Monitoring personnel access adjacent buildings, public footways, and active construction zones to take readings.
Trigger levels are set in the monitoring plan — exceeding them requires immediate investigation and potential work stoppage.
Automated total stations and tiltmeters provide continuous real-time monitoring with electronic alert systems.
BS 5975 and Eurocode 7 provide guidance on monitoring requirements for geotechnical and temporary works.
Monitoring data must be processed, reviewed, and reported daily to the project team and design engineer.
Installing monitoring points often requires drilling into structures, working at height, or entering restricted zones.
Damage to monitoring instruments by construction activities invalidates results and creates dangerous data gaps.

Prevent structural damage	Undetected settlement damages adjacent buildings, services, and infrastructure — monitoring provides early warning.
Trigger response	Exceeding settlement trigger levels means something unexpected is happening underground that could lead to collapse.
Legal and contractual duty	Planning conditions and CDM 2015 require monitoring to protect adjacent properties during deep construction work.

Don't

Install monitoring points in accordance with the project monitoring plan before works begin
Take readings at the frequency specified in the monitoring plan without gaps or delays
Compare results against trigger levels daily and report exceedances to the engineer immediately
Protect installed monitoring targets and instruments from damage by construction activities
Wear appropriate PPE when accessing buildings, public areas, or active work zones for readings
Record all monitoring data accurately with date, time, instrument ID, and reading values
Use automated monitoring systems where continuous real-time data is required by the design
Brief construction teams on the locations of monitoring instruments to prevent accidental damage
Maintain backup monitoring capability in case automated systems fail or lose communication
Complete a pre-condition survey of adjacent structures before any construction activity begins

DON'T ignore trigger level exceedances — they require immediate investigation and response
DON'T skip monitoring readings or allow data gaps during active construction phases
DON'T damage or obstruct monitoring instruments with plant, materials, or construction activities
DON'T access adjacent properties for monitoring without owner consent and a risk assessment
DON'T use uncalibrated survey instruments as results will be unreliable and legally challenged
DON'T delay reporting monitoring results to the design engineer and project team
DON'T move or reposition monitoring targets without the monitoring engineer's authorisation
DON'T install monitoring points without considering access for ongoing reading throughout the works
DON'T treat monitoring as secondary to construction progress — it protects people and structures
DON'T dismiss small movements as insignificant — trends matter more than individual readings

See also: Vibration Monitoring Safety | Adjacent Structure Monitoring

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