Tuesday, December 29, 2015

TBM innovations approach field testing

TBM innovations approach field testing:



Ground prediction system

An important development by NeTTUN is a combined ground prediction system for TBMs, known as TULIPS. The system is designed to facilitate fast, frequent and effective detection of ground conditions ahead of the excavation face. At its heart is electromagnetic radar technology – developed by Italian radar manufacturer IDS – and a seismic source and sensor network developed by Dutch-based MI Partners.
“We have been through the development of the radar antennae in parallel with the radar software development,” said Camus. “We have finally selected a new design of antennae that will cope with size constraints at the cutter head. We have also solved the problem that arose due to the presence of the metallic mass of the cutter head itself.” IDS is currently fine-tuning two antennae for a TBM that has been manufactured by NFM Technologies. This TBM will test the concept in real time as it excavates the first stretch of the 57km-long Lyon–Turin railway tunnel, starting early 2016.
The hardware aspect of the seismic system has already been completed and tested. MI Partners, in partnership with the Technical University of Delft, has designed a new type of seismic source and a sensor that includes geophones, which will also be installed on the TBM cutterhead. “The trick is to protect this piece of equipment when the TBM is excavating,” said Camus. “The equipment protrudes in front of the TBM slightly as it takes measurements, but during excavation itself, everything will retract. This is quite innovative.”
Meanwhile, the software for the system is under development, mainly at Delft University. Once completed it will automatically process the data collected by the radar and seismic sensors, thereby creating a detailed 3D-image of the ground ahead of the excavation face. “This fully automated system is totally new, at least in the tunnelling industry,” said Camus. Another team, from the University of Leeds, is working on combining and simultaneously interpreting the data from both the radar and the seismic sensors. “In the future a third system could even be added,” explained Camus, “although this is not something that is planned at the moment, we want this to be an open system.”

Improving drag bits

Another important topic addressed by the NeTTUN development teams is the lifespan of drag bits, an area that Camus himself was already working on before the establishment of NeTTUN.


Masinagruppide nädal Mäeinstituudis
Mäeinstituut- geotehnoloogia, koolitus, teadustöö, projekteerimine, teenused ja litsentsid
Kaevandamine ja geoloogia

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