Lovat Inc. designs RME140SE Earth Pressure Balance TBM for cable tunnel in Croydon, United Kingdom
Aug 31, 2006
The infrastructure services company Morgan Est plc. of Rugby, England has contracted with Lovat Inc. for the purposes of design and manufacture of a 3.6 metre diameter Lovat RME140SE Earth Pressure Balance TBM. This will be the latest TBM to complement Morgan Est's fleet of Lovat TBMs which range from 2.3 to 4.4 metres diameter.
The EPB-TBM will be running at a depth from 8.3 m to 83 m above the tunnel crown. An EPB pressure up to 2.5 bar is expected. The entire tunnel alignment is through local Upper Chalk with frequent occurrences of flint and mixed gravel.
The cuttinghead will be powered by 4 No. 113kW (452kW total) water-cooled Lovat-standard variable frequency drive electric motors which will provide the cuttinghead with 1,200 to 2,300 kN*m of torque from 1.8 rpm to 3.4 rpm.
The TBM is designed for operation with EPB pressures up to 8 bar, an instantaneous rate of advance of 100 mm/min and a target completion of 3 No. 1.2 metre-long rings per hour.
The TBM is scheduled for delivery in January, 2007.
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