The Big Apple Group offers complete Pre-Construction Conditions Inspections prior to construction/demolition.
This inspection documents the existing conditions of the adjacent structures surrounding your project, reducing exposure to lawsuits arising our of perceived damages caused by construction activity. Additionally, the Big Apple Group offers Post-Construction Condition Inspection comparing the current conditions to those documented during the Pre-Construction Condition Inspection.
Vibration Monitoring is performed by documenting ground borne vibrations during construction. This type of monitoring helps protects the adjacent structure from exceeding the pre-determined vibration limitations and assists the contractor with mitigating their activity to reduce vibrations. Big Apple offers two forms of monitoring:
Remote Vibration Monitoring: Technicians installed programmed portable seismographs to continuously measure and record vibration activity during the workday. The data is uploaded to a server daily. Alerts via email are sent if a vibration is detected above limits, in real time.
On-Site Vibration Monitoring: Technicians install portable seismograph and monitor the site daily (in person) for on-site analysis and notification of the data collected. Crack Monitoring Big Apple has the capabilities to install both Manual and Remote Crack Monitors. These systems are used to monitor any movement of existing cracks or newly developed cracks.
Big Apple provides both Manual and Remote Noise Monitoring. The system is equipped with advanced sound level meters and real-time analyzing to existing background levels for noise (conducted prior to the start of work).
The results will be used to establish a baseline of existing conditions. Noise Monitoring is also performed during construction activity to ensure noise levels do not exceed specified requirements.
Big Apple also provides optical monitoring and comprehensive reporting to track structural movement horizontally and vertically during construction activities. Points are set along various locations at the perimeter of the site, a baseline is established, and measurements are gathered as an indicator of settlement.
“Telltales” also known as crack gauges are installed and monitored on any open joints in the permanent structures on neighboring properties in locations specified by client and the engineer on record (EOR). The gauges are clear plastic that measure 1-inch tall by 6-inches long and come in two halves. The two halves are secured using epoxy glue or a direct fastener on opposite sides of an existing crack.
The halves overlap such that they can detect relative movements that are measured to the nearest 1 mm on a graduated scale. Monitoring crack widths in concrete buildings, bridges, and roads is easy and reliable with Concrete Crack Monitors. Opening and closing and differential movement of the crack is continuously monitored.