Noise and vibration monitoring during Crossrail tunnelling ...
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Noise and vibration monitoring during Crossrail tunnelling under the Barbican I have to admit I was excited; in a geeky kind of way. Who else gets the opportunity to have the Barbican concert hall all to themselves for the night? Okay, so it was 1.10am on a Wednesday morning and we were here to work. And maybe, just maybe, we would hear Elizabeth steadily grinding her way 30m beneath us. Elizabeth was the first of DSJV Tunnel Boring Machines (TBMs) to make her way eastwards on her final leg of this Crossrail project to Farringdon. We were in the Barbican to measure any vibration and listen for any audible signs of her coming through. Her original path involved cutting through some of the Barbican piles. If this happened it would lead to the complication of the tunnel lining having direct contact with the piles for the Barbican. This would create an easy transmission route for vibration, potentially resulting in tunnelling works (and even possibly the operational train) being audible in the Barbican. This would mean the contractor had not met the stringent design aims for noise and vibration for the concert hall. Elizabeth passed quietly underneath us. Guess she found a path through those piles after all. Back in the office in the daylight, we analysed the data collected. Yes she was there, the vibration traces through our highly sensitive accelerometers picked her out. The next potential problem would come from the train using the temporary track to supply the TBM with concrete rings and remove the spoil waste. The data confirmed the accuracy of our bespoke prediction model (the first of its kind) and our recommendations on the choice of track design used. The accuracy of our predictions regarding track type allowed our client to achieve considerable cost savings. Gillian Whyman – Acoustic Consultant SRL Technical Services SRL Services l Acoustic & vibration consultancy l BREEAM and Energy Assessments l Noise & vibration monitoring l Air quality and dust monitoring l Transport Planning and Infrastructure l Liaison with Local Authorities and other stakeholders London Office 70 Cowcross Street London EC1M 6EJ +44 (0)20 7251 3585 www.srltsl.com Technical Services Limited
Transcript of Noise and vibration monitoring during Crossrail tunnelling ...
Noise and vibration monitoring duringCrossrail tunnelling under the Barbican
I have to admit I was excited; in a geeky kind ofway. Who else gets the opportunity to have theBarbican concert hall all to themselves for thenight? Okay, so it was 1.10am on a Wednesdaymorning and we were here to work. Andmaybe, just maybe, we would hear Elizabethsteadily grinding her way 30m beneath us.
Elizabeth was the first of DSJV Tunnel BoringMachines (TBMs) to make her way eastwardson her final leg of this Crossrail project toFarringdon. We were in the Barbican tomeasure any vibration and listen for anyaudible signs of her coming through. Heroriginal path involved cutting through some ofthe Barbican piles. If this happened it wouldlead to the complication of the tunnel lininghaving direct contact with the piles for theBarbican. This would create an easytransmission route for vibration, potentiallyresulting in tunnelling works (and evenpossibly the operational train) being audible inthe Barbican. This would mean the contractor
had not met the stringent design aims fornoise and vibration for the concert hall.
Elizabeth passed quietly underneath us. Guess she found a path through those pilesafter all. Back in the office in the daylight, weanalysed the data collected. Yes she was there, the vibration traces through our highlysensitive accelerometers picked her out.
The next potential problem would come fromthe train using the temporary track to supplythe TBM with concrete rings and remove thespoil waste.
The data confirmed the accuracy of ourbespoke prediction model (the first of its kind)and our recommendations on the choice oftrack design used. The accuracy of ourpredictions regarding track type allowed ourclient to achieve considerable cost savings.
Gillian Whyman – Acoustic ConsultantSRL Technical Services
SRL Services
l Acoustic & vibration consultancy
l BREEAM and Energy Assessments
l Noise & vibration monitoring
l Air quality and dust monitoring
l Transport Planning and Infrastructure
l Liaison with Local Authorities and other stakeholders
London Office70 Cowcross Street London EC1M 6EJ +44 (0)20 7251 3585www.srltsl.com
Technical Services Limited
