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J Murphy boring for National Grid
00:00 08 Aug 2001
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Doris, one of three tunnel boring machines to be used by J Murphy
on a project with the National Grid, gets its final checkover
before starting work this week.
Along with two other Lovat-type full-face machines - Helen and Caroline - Doris is being used to drive a 20km cable tunnel from a substation in Elstree, Hertfordshire, to St John's Wood in London to meet increasing electricity demands in the capital.
The three machines have been refurbished and modified by Murphy to suit the needs of the particular ground conditions; in this instance London clay with some sand in the first 2km.
Doris and her colleagues will measure 60m long, with the train for soil excavation, and are set to excavate 50m of completed tunnel per day.
Reader enquiry no: 105
Along with two other Lovat-type full-face machines - Helen and Caroline - Doris is being used to drive a 20km cable tunnel from a substation in Elstree, Hertfordshire, to St John's Wood in London to meet increasing electricity demands in the capital.
The three machines have been refurbished and modified by Murphy to suit the needs of the particular ground conditions; in this instance London clay with some sand in the first 2km.
Doris and her colleagues will measure 60m long, with the train for soil excavation, and are set to excavate 50m of completed tunnel per day.
Reader enquiry no: 105
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