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Manhole locations - Fulham

Manhole Construction

Working in partnership with Fujitsu Eirscot is delivering the infrastructure to enable BT Property to transfer it's capabilities from their telephone exchange in Fulham to the West Kensington Exchange as part of their Operational Estate Consolidation Program project managed by Parsons.

The Project

The project requires Eirscot to deliver Five new Manholes (Positions Marked adjacent map) carrying half a kilometre of 12 way duct along North End Road within the strict timeframe of a six week Road closure to coincide with the introduction of the extension of the congestion charging boundaries.

To deliver within this timeframe Eirscot's specialist teams are operating on six distinct and complex workfaces simultaneously.

Manhole No 1 Thaxton Road
A non standard manhole of some 28m cubes constructed to an excavated depth of 5 metres. This manhole is being built over an existing 48 way BT duct nest previously laid in a timber lined tunnel, with the existing concrete duct surround being broken away and the 48 way ducts cut back within the excavation.



To maintain traffic flow into and out of Thaxton Road a timber lined tunnel was driven across the junction from the shaft at a depth of 4.5m to a receive pit at 3.0m. At this point 12 ways of the 24 way ducts lain in tunnel were picked up by open cut trenching methods. Excavation of this structure and tunnelling proved difficult and slow due to the running ballast and general loose ground condition found at 3.5m to final excavation depth.



Duct
The new 12 way duct route was laid from Manhole 1 in the carriageway through Manholes 2, 4, to manhole 127 during the road closure period. The route followed a central location in the carriageway as BT were to install a 4,600 pair copper cable which required full bore capacity. The works were carried out in parallel with programmed works by both Thames water and Hammersmith &Fulham Highways Department and completed two weeks ahead of the scheduled road opening.



Manhole No 2
A standard BT MRX 411A manhole built on an existing 12 way and 9 way BT duct nests. The existing 9 way ducts being slewed to an agreed position to facilitate BT's alignment of the new 12 way ducting. Non-standard cable support system designed and installed to suit cabling requirements.



Manhole No 4
A standard BT MRX 411A manhole constructed to pick up the existing BT 12 way and 9 way duct routes with non-standard cable support system designed and installed to suit cabling requirements.



Manhole No 76
Situated in the middle of the carriageway at the junction of North End Road and Talgarth Road, this non-standard manhole involved the demolition of an existing R/F concrete BT manhole and a rebuild to include a new side entry shaft facilitating future access in an extremely traffic sensitive location. This work was carried out with a critical timescale to facilitate the introduction of the second phase of the London Congestion Charge Zone. The demolition and building was hampered by the presence of three high voltage electricity cables running within the long wall of the existing structure. Extra night shift working was introduced to ensure the target road opening date of 15 February 2007 was met.



Manhole No 127
A standard BT MRX 411A manhole built on an existing BT 12 way and 9 way duct route.  Due to the position of the existing duct a 9 way block was slewed and lowered over 15m to accommodate the new 12 way BT duct under construction.
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