Crossrail has launched a new interactive mapping tool on its website that will eventually allow the progress of all eight of its TBMs to be tracked online as they excavate 21km of twin-running tunnels under London.
The service - called Near You - charts the precise position on a scaleable Ordnance Survey street map of each TBM. The information is updated daily using information from the contractor.
The function also includes a 30-day (yellow dotted arrow) and 90-day predicted position (blue dotted arrow) for each TBM based on current progress rates, and also gives details of the distance remaining to complete the drive (Fig 1). Tunnel alignment remaining to be excavated is marked in red, with completed sections marked in green.
Fig 1. TBM progress updated daily
Fig 2. Drive sections can be broken down
By toggling on the option "Information Plans" drives are further broken down into smaller blue sections (Fig 2) for which detailed alignment plans showing the construction in relation to other infrastructure such as existing underground alignments can be accessed (Fig 3).
The map also gives updates on progress at all Crossrail construction sites along the route.
So far two TBMs have been launched eastwards from the westernmost portal at Royal Oak for the £500 million construction of the western running tunnels for the BAM Nuttall/ FerrovialAgroman/ Kier Construction JV (Drive X).
The first TBM, Phyllis, which launched in May (2012), was recorded yesterday (October 10) as having just broken the 1km mark for a total of 1,009m, with a remaining distance of 4.87km until it reaches its destination at Farringdon. It is now at Paddington, where a new station will be built, and is due shortly to begin tunnelling under historic Hyde Park.
TBM Ada, which launched last month on the parallel drive, has travelled 152m with 5.73 km remaining until it too reaches Farringdon via the station boxes at Paddington, Bond Street and Tottenham Court Road.
Fig 3. Detailed TBM drive alignment plans for each section
TBM Phyllis launches from Royal Oak
Later this year the Sisk/Dragados JV will launch a second pair of machines (Victoria and Elizabeth) from the Limmo portal in Docklands, driving 8.3km west towards Farringdon via new station boxes at Whitechapel and Liverpool Street (Drive Y).
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