National Grid
National Grid is an energy company operating in the UK and US. We deliver electricity and gas safely, reliably and efficiently to the customers and communities we serve – all while working towards a clean energy future.
- Date
- 16 May 2024
- Time
This event has now ended
Overview
As part of its national Visual Impact Provision programme, National Grid are working towards removing some of the most visually impactful overhead lines in AONBs and National Parks. The Snowdonia VIP project forms part of this programme of works. In the Eryri National Park, National Grid are constructing a cable tunnel to allow the removal of 10 pylons and 3.4km of overhead line which spans the estuary near Portmeirion, allowing the 400kV replacement cables to be placed in a tunnel deep under the estuary improving the appearance of this important estuary.
The Project involves the design and construction of:
- 3.4km tunnel of 3.5m diameter connecting 2 new shafts at Garth and Cilfor.
- 2 new headhouses at each Shaft.
- Construction of one new sealing end compound and reconfiguration and extension of an existing sealing end compound.
- Two high voltage (HV) electrical circuits.
- Electrical circuits connected at one end to a reconfigured Garth Sealing End Compound (SEC) and at the other end to the new Cilfor SEC.
HOCHTIEF UK have been appointed as the design and construct contractor for these works, supported by AECOM for the detailed design for the tunnels, shafts headhouses, and M&E systems. This presentation will outline the need for the project, the project constraints, design considerations, and construction methodologies for the scheme.
HOCHTIEF UK Construction
Established in 1990, HOCHTIEF (UK) Construction Ltd offers innovative solutions to complex civil engineering projects throughout the UK. With highways, rail, heavy civil engineering and infrastructure schemes forming the bulk of our workload, we also bring in world-class expertise from the wider HOCHTIEF group to deliver projects in tunnelling, marine and energy.
AECOM
AECOM is the world’s trusted infrastructure consulting firm, partnering with clients to solve the world’s most complex challenges and build legacies for generations to come.
Organised by
British Tunnelling Society
The BTS is a dynamic group of tunnelling professionals sharing knowledge within the industry.
Speakers
Steve Ellison
National Grid
Senior Project Manager
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Steve Ellison
Steve Ellison is a senior project manager working for National Grid and is a champion for safe delivery of major infrastructure projects with over 30 years of major project delivery experience. He has recently completed the World recording breaking River Humber pipeline replacement project that involved the design and construction of a 5km estuary tunnel.
The challenges faced during the Humber project and lessons learnt have been key to the development of the Eryri VIP project.
Stephan Assenmacher
HOCHTIEF TCC
head of technical services tunnelling
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Stephan Assenmacher
Stephan Assenmacher is head of technical services tunnelling for HOCHTIEF Technical Competence Center. He is a mining engineer and has been working for over 30 years in the construction industry delivering TBM tunnel projects in all diameter ranges.
His previous National Grid tunnel experience has included the Feeder 9 Replacement Project and the London Power Tunnels Phase 2.
For Snowdonia VIP, Stephan is HOCHTIEF TCC’s senior construction manager for the TBM design and tunneling works, supporting the HOCHTIEF UK Project Team on site from the Head Office in Essen, Germany.
Steve Woodrow
AECOM
director - head of tunnelling
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Steve Woodrow
Steve Woodrow is head of tunnelling for AECOM. He is a Chartered Civil Engineer and has worked for over 30 years in the design and construction of tunnel projects.
His previous National Grid cable tunnel experience has included the Elstree to St. Johns Wood Cable Tunnel, the Lower Lea Valley Cable Tunnels, and the ongoing London Power Tunnels. For Snowdonia VIP, Steve is AECOM’s project director for the detailed design, supporting Hochtief.
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