Tunnels & Subways

Construction activities that take place on the surface can create vibrations that have an adverse impact on tunnels or subway systems that lie beneath job sites. Similarly, the processes and equipment, such as blasting or tunnel boring machines (TBMs), used in the creation of new tunnels can cause damage to existing tunnel or subway systems. These activities create ground vibrations which travel through the ground away from the source. When vibration levels from the creation of a new tunnel are high enough, they can also damage roads, buildings or other structures above ground.

Similarly, when vibration levels from above ground construction or the construction of a new tunnel are high enough, rock or other material can become dislodged and fall on the tracks or road in the tunnel. In these cases, the traffic system may need to be shut down until the debris can be found and any damage is repaired. These damages can be costly and result in project delays.

The Instantel monitoring system pairs the Micromate Plus unit with a versatile range of sensors to capture vibration, noise, and air overpressure simultaneously with real-time data reporting powered by Vision II software. With cable lengths of up to 1,000 m, the monitoring unit can be placed safely outside the tunnel while still collecting data from sensors installed deep inside. Vision II enables full remote configuration from anywhere with an internet connection—whether on site, in the office, or even from your vehicle.  Sensors are fully interchangeable, allowing quick and simple swaps whenever calibration is required. And in environments where electromagnetic interference (EMI) is a concern, the Micromate Plus offers shielded units and sensors designed to minimize electrical noise and ensure reliable measurements.

Instantel monitoring equipment is engineered for durability and long-term deployment, making it ideal for permanent installations over the duration of tunneling or subway projects. Data captured by the system is transmitted in real time and accessible through Vision II, our secure, cloud-based platform, from any internet-connected device.  

Vision II provides full remote device management capabilities, allowing users to program or adjust monitoring schedules, check battery and memory status, retrieve recorded events, and perform firmware updates—all without needing to access the device onsite. For projects requiring continuous oversight, such as those governed by transit authorities, Vision II supports 24/7 automated data sharing. Devices can be configured to record in Histogram-Combo mode continuously, capturing background vibration levels while still generating detailed waveform reports for events that exceed defined trigger thresholds. The histogram event reports deliver peak particle velocity (PPV) values at set intervals, ensuring comprehensive vibration profiling throughout the monitoring period. With a sound level microphone installed, not only can the noise decibel levels be recorded, but also audio clips to identify the source of the noise.  

 All Instantel systems are designed for remote configuration and autonomous operation, backed by rigorous manufacturing standards and certified calibration for maximum reliability and data integrity.