Railtrack Monitoring During Nearby Excavations – An interview with Victor Salinas

Worldsensing is a leader in IoT remote monitoring. It has over 3,000 network deployments around the world, in sectors including rail, mining and construction. Its solutions are primarily used to monitor how geotechnical, geospatial and structural conditions impact civil infrastructure to help prevent life-threatening incidents.

Railway News interviewed Victor Salinas, an Application Expert at Worldsensing about the benefits of using IoT monitoring to check for variations to track geometry when excavations are underway nearby. He also discussed how this technology complements existing solutions so well.

What does IoT track monitoring bring to the table when it comes to excavation works taking place nearby?

Well, first of all you have to consider that some railways can be in remote, hard to access locations which can make inspection and monitoring much more difficult. By digitising railtrack monitoring we offer remote, unattended and automatic inspection of a wide range of parameters.

IoT monitoring has a role to play throughout the lifecycle of a railway from the construction phase to commissioning and operation.

Excavations can affect the surrounding area in a variety of ways and so monitoring is key. This is especially the case when it takes place near existing, operational rail infrastructure,
as construction works can disturb settled soil in the vicinity, in turn potentially affecting the geometry of tracks and associated structures.

We can’t be there all the time, but with IoT we can define critical parameters – such as those related to track geometry – that can be continually monitored even when the workers go home. This ensures we always know how an excavation is affecting the surrounding area and that existing infrastructure is within safe operational parameters.

Simply put, IoT monitoring provides a more detailed picture of the situation. When you need to monitor a large area the use of survey trains is probably the best approach to collect high density spatial data regarding the geometry of the track. But when you detect a critical area, where data is required in a fast rate, this train approach becomes very expensive as it requires high operative costs. On top of this, they cannot be used when the line is operational, meaning monitoring isn’t possible during certain times of the day.

What other types of equipment have been used to monitor the effect of excavation works?

There are a range of ‘classic’ monitoring tools available. One, for example, can be applied to trolleys or strollers. These have a very low OPEX cost compared to the survey trains, but yet require human intervention and interruption of the service during the survey.

For entirely remote monitoring, topographic systems such as prisms are a common solution, but as they use line of sight for measuring, they do have limitations. For example, rainy and foggy days can affect monitoring, as can snow, which can cover the equipment entirely.

IoT devices can help to fill the data gaps from topographic systems. Tiltmeters, for example, monitor the tilt of a surface and can be installed directly onto sleepers. They offer a high sampling rate, if required, depending on the scenario and activity. You might be happy gathering data once or twice a day, or you might want to take advantage of its ability to provide updates every few minutes.

These features lead to a great synergy between the two approaches; topographic and IoT. The data coming from these two independent approaches offers a more robust dataset that gives you a much better picture of the situation.

Simply put, topography and tiltmeters have lots of synergies and so complement each other really well.

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