HS2 Super Structure | Victoria Road Crossover Box

The Victoria Road Crossover Box, near to Old Oak Common in West London, will allow HS2 trains to switch tracks underground on their approach into the new superhub station.

The Victoria Road Crossover Box site is located to the west of where the new superhub HS2 Old Oak Common station is being constructed. The huge underground box structure will house a crossover track mechanism that will allow HS2 trains to switch between tracks, on the approach and descent from Old Oak Common station.

The box will be 130m in length and 24m deep complete with 1.5m thick walls constructed by diaphragm piling method, with top and intermediate levels of reinforced concrete props. The base slab of the crossover box will be supported by 77 piles which are being installed 20m into the ground below the slab level.

The site at Victoria Road will also be home to the Victoria Road Ancillary Shaft, which will provide ventilation and emergency access to the rail line during operation. The shaft has an internal diameter of 25m and has been constructed using pre cast rings at the top, and using a sprayed concrete lining technique at the bottom.

It is currently being prepared to launch two tunnel boring machines, which will be used to construct the eastern section of the Northolt Tunnel. Each machine will bore 3.4 miles North West towards Green Park Way shaft. The TBMs will begin the 12 month programme of tunnelling later this year

The shaft will also provide ventilation and emergency access to the tunnels below when HS2 services start running.

The site has also been connected to the HS2 Logistics Hub, located at the Willesden Euroterminal, by a conveyor system that will remove spoil excavated for the tunnels. The conveyor system will contribute to reducing lorry movements for HS2, removing around 1 million lorries from the road during the construction of HS2.

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0:00 Introduction
0:16 Where is the site?
0:28 What is the Victoria Road Crossover Box?
1:26 What works have been completed?
2:58 The dimensions
3:05 How much has been steel has been used?
3:13 Excavating material
3:26 The design
3:58 Current construction works
4:31 Tunnel preparations
5:35 The Victoria Road Ancillary Shaft
6:27 Outro

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