Structural Monitoring / FILE 11
Construction Monitoring
Construction activity near existing buildings creates risk. Our monitoring systems measure vibration, settlement, and structural movement in real time, protecting adjacent properties and providing compliance evidence.
EVIDENCE / CONSTRUCTIONConstruction monitoring protects existing buildings and infrastructure from damage caused by adjacent construction activity. Excavation, piling, demolition, rock-breaking, and heavy vehicle movements generate vibration and ground movement that can affect neighbouring structures.
We install vibration monitors (tri-axial accelerometers) on adjacent buildings to record peak particle velocity (PPV) at each blast or vibration event. Alert thresholds are set in accordance with DIN 4150-3 and AS 2670.2, with automated SMS alerts if limits are approached.
Settlement monitoring uses precision survey points to track vertical and horizontal movement of adjacent structures during excavation and dewatering. Readings are typically taken daily or weekly depending on the excavation stage and proximity.
Pre-construction dilapidation surveys document the existing condition of adjacent properties before construction begins. This establishes a baseline against which any alleged damage can be objectively assessed.
Capabilities
What we deliver
10 deliverables across the construction monitoring engagement.
- 01Tri-axial vibration monitors with real-time alerts
- 02Peak particle velocity (PPV) compliance monitoring
- 03Precision settlement monitoring
- 04Pre-construction dilapidation surveys
- 05Adjacent property condition reporting
- 06Automated DIN 4150-3 threshold alerts
- 07Vibration event logging and waveform capture
- 08Construction stage progress correlation
- 09Regulatory compliance documentation
- 10Post-construction close-out reporting
Process
Our methodology
01
Dilapidation Survey
Detailed photographic and written record of existing condition of all properties within the zone of influence before construction begins.
02
System Installation
Installation of vibration monitors, settlement points, and crack gauges as required. Commissioning of real-time alert systems with agreed threshold levels.
03
Ongoing Monitoring
Continuous monitoring throughout construction with daily data review, weekly summary reports, and immediate notification for any threshold exceedance.
04
Close-Out Report
Post-construction survey comparing final condition to baseline dilapidation record. Assessment of any changes and attribution to construction activity or other causes.
Use cases
Common applications
- Basement excavation adjacent property protection
- Piling vibration monitoring and compliance
- Rock-breaking and demolition vibration control
- Tunnel boring machine (TBM) ground movement monitoring
- Dewatering-induced settlement monitoring
- Rail and road infrastructure construction monitoring
- Heritage building protection during adjacent works
- Insurance evidence collection during construction
Frequently asked questions
4 questions answered.
Q01
What vibration levels are safe for buildings?
DIN 4150-3 provides guideline PPV values based on building type and vibration frequency. For residential buildings, the limit is typically 5mm/s at the foundation level for short-term vibration and 2.5mm/s for continuous vibration. Heritage and sensitive structures have lower limits, typically 3mm/s. These are guideline values for preventing cosmetic damage; structural damage requires significantly higher levels. We set monitoring thresholds below these limits to provide early warning.
Q02
What is a dilapidation survey?
A dilapidation survey is a detailed record of the existing condition of a building before construction begins nearby. It includes room-by-room photographic documentation of all visible defects, cracks, damage, and notable features. The survey establishes the baseline against which any post-construction claims are assessed. Without a pre-construction survey, it is difficult to prove whether damage was caused by construction or was pre-existing.
Q03
How far from the construction site should monitoring extend?
The zone of influence depends on the construction activity. For typical basement excavation, monitoring is recommended for all structures within twice the excavation depth. For piling, the zone depends on pile type and ground conditions but typically extends 15 to 30 metres. For blasting, the zone extends further based on charge weight and ground conditions. We calculate the monitoring zone for each project based on the construction methodology and ground conditions.
Q04
Who is responsible for construction monitoring costs?
Typically the party undertaking the construction work bears the cost of monitoring adjacent properties. In many jurisdictions, development approvals require vibration and settlement monitoring as a condition of consent. The construction monitoring programme is usually specified by the geotechnical or structural engineer and forms part of the construction management plan.
Related
Related services
- 01Structural Health MonitoringContinuous sensor-based monitoring with cloud dashboards and automated alerts.
- 02Crack Movement MonitoringDistinguishing seasonal movement from progressive structural cracking with precision sensors.
- 03Building Condition AssessmentFull building surveys, dilapidation reports, and capital works planning.
- 04Forensic EngineeringRoot cause failure analysis for structural collapses, defects, and disputes.