First above ground HS2 structure completed at Euston

First above ground HS2 structure completed at Euston

A new structure that will house infrastructure for the London Underground has been completed as part of HS2’s redevelopment at Euston.

The existing Traction Substation (TSS) for the Northern line – which runs beneath the terminus – needs to be moved as part of preparations for the construction of the high-speed line station.

Traction substations are used to convert electrical power to a form suitable for rail systems. The new Euston TSS will enable the relocation of equipment needed to provide services and ventilation for the safe operation of the Northern line.

The new structure is a 20-meter deep box with a 90-meter long tunnel connecting it to the London Underground network. It was built by HS2’s construction partner at Euston, Mace Dragados Joint Venture (MDJV), and involved over 600,000 manhours of work.

The team used 80km of steel reinforcement bars and poured 600m3 of concrete to create the reinforced concrete walls of the superstructure. They also fitted out the internal blockwork and doors, and completed the roof.

The work to construct the tunnel was a 24-hour operation in a densely populated part of London. To reduce noise impact on the community and businesses nearby, an acoustic shed was erected by the team over the construction shaft.

The team led by MDJV has also successfully completed the civils and structural work with no major incidents whilst working adjacent to a Thames Water main and large sewer, and underneath the operational Northern and Victoria London Underground lines.

Speaking about the completion of the civils work of the traction substation, Andy Swift, project client for Euston Station at HS2 Ltd, said: “The Euston team have worked around the clock to complete the first above ground structure required for HS2’s Euston station.

“Whilst the station design is under review, the Government is committed to bringing HS2 to Euston, and we are continuing with work required to make that happen.”

Paul Leighton, delivery director, Mace Dragados JV said: “The traction substation project represents everything that’s exciting about complex infrastructure delivery. From working within a tightly constrained physical environment to liaising with a wide range of stakeholders and managing their competing needs.

We’ve had to draw on experienced colleagues from across our diverse team and supply chain to meet this critical milestone.”

The mechanical, electrical and plumbing (MEP), and architectural fit out of the TSS has now begun with commissioning due to be completed in 2025. New modern equipment will be installed which will provide improved reliability and reduce maintenance requirements. Once the new infrastructure is up and running, the old equipment currently housed in the existing TSS on Melton Street will be decommissioned and the building demolished.

The existing TSS is a building which was once an entrance and exit to what is now the Northern line. Since changes to the London Underground at Euston in 1914, the building was no longer used as a ticket office and entrance but rather, was used to house ventilation equipment for the underground.

Euston will eventually become HS2’s main southern terminus in the capital. In line with direction from the government, it was announced earlier this year that full construction of the new station would be paused to ensure it is delivered as efficiently and cost effectively as possible. HS2 continues to carry out enabling works which will still be required for the completion of the HS2 station, making sure the programme can restart as efficiently as possible in due course.

Photo Credit: HS2

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