When is Vibration Monitoring Necessary?

Many construction projects in New York City, Northern New Jersey and the surrounding metro-area will require vibration monitoring plans and programs before work can begin on a construction site.

Construction activities can create vibration levels that can potentially lead to structural damage within surrounding buildings. As a result, many of these activities create a need for vibration monitoring. In addition, in New York City, Technical Policy and Procedure Notice TPPN #10/88 requires preconstruction surveys, vibration monitoring, optical structural monitoring & crack gauge monitoring on all landmarked structures within 90 feet of the site lot (this also includes structures within a historic district).

Below is a link to discover New York Landmarks that identifies both historic landmark districts & individual land mark structures.

https://nyclpc.maps.arcgis.com/apps/webappviewer/index.html?id=93a88691cace4067828b1eede432022b

Construction Activities Requiring Vibration Monitoring Services

Vibration levels are a concern for a variety of construction activities conducted within urban landscapes. Among the more common scenarios and activities that may require vibration monitoring include demolition, excavation, blasting, pile driving, or even heavy equipment operation. Building codes in urban areas include structural and safety regulations that may require vibration monitoring and systems be put in place to ensure that vibration levels don’t exceed specified thresholds.

 

NYC Landmark Buildings and TPPN 10/88

In New York City, as per TPPN 10/88, all construction activities within a 90’ radius of a landmark building or district require pre-construction surveys, optical structure monitoring, crack gauge monitoring and vibration monitoring services.

TPPN 10/88 creates a baseline which legally protects contractors and property owners in various phases of a project, including pre-construction, during construction and post construction. To be compliant with TPPN 10/88, an ongoing construction monitoring program must be put into place prior to the beginning of the project.

Along with Vibration Monitoring, TPPN 10/88 requires pre-construction surveys, optical structure monitoring and crack gauge monitoring as part of the monitoring and precautionary procedures.

 

Vibration Monitoring Types

There are two types of vibration monitoring used during construction, depending on the types of structures surrounding the site. For example, MTA structures require manned vibration monitoring.

Remote, or wireless vibration monitoring: The vibration monitoring instruments are placed on or adjacent to the job site and monitor continuously with real time readings and alerts reported to the client as specified or required.

Manned monitoring: With manned monitoring, the equipment and instruments are installed and are carefully monitored by a trained field technician, who is in communication with site engineers, construction managers or other site personnel.