Shaft Sinking at Llanberis Waste Water Treatment Works. M237

Welsh Water

Substantial upgrade to the existing WwTW at Llanberis.


A substantial upgrade to the existing WwTW at Llanberis. Welsh Water is achieving its best ever environmental performance thanks to investment on its wastewater treatment works and sewer network. These works play an essential role in protecting the environment and improving bathing water quality and also helped Wales' first designated freshwater bathing lake - Llyn Padarn near Llanberis - secure ‘excellent’ water quality.

Description of Works:

9No deep wells removing up to 80litres/sec of ground water.

DN12000 x 7.0m deep jacked caisson to provide a humus sedimentation tank.

Mass concrete plug, reinforced concrete base, RC in-situ lining to shaft walls and high accuracy sloping benching to suit the mechanical scraper bridge.

Ductile iron and MDPE pipework to connect the HST to the rest of the new system.

DN3000 x 4m deep desludge chamber including RC base.

Ground conditions:      Clay overlying wet sands and gravels.

Study Project Date  
Works at M6 Junction 16-19 Smart Motorways. M243 06/11/2017
Shaft Sinking at Bryn Cowlyd Water Treatment Works, Dolgarrog, Wales. M236 06/02/2017
Shaft Sinking at Llanberis Waste Water Treatment Works. M237 03/10/2016
Shaft Sinking at Wythenshawe. M226 06/07/2015
Shaft Sinking at Parsons Street Underbridge, Bristol. M215 06/07/2015
Shaft Sinking at Collingwood Road/Melville Road Shaft, Bristol, Avon. M206 07/04/2014
Shaft Sinking at Pool Close, Puriton, Somerset. M205 13/01/2014
Shaft Sinking at Ipswich Chord Sewer Diversion, Ipswich. M194 03/06/2013
Shaft Sinking at Wellwood Street FAS, Amble, Northumberland. M188 05/11/2012
Shaft Sinking at Shepton Mallet STW Upgrade, Shepton Mallet. M183 27/07/2012
Shaft Sinking to Heald Green Station UTX, Cheadle, Manchester. M180 29/02/2012
Shaft Sinking at Howdon STW, Newcastle Upon Tyne. M179 30/11/2011
Microtunnelling at Denshaw Road, DG5, Delph, Lancashire. M173 31/10/2011
Shaft Sinking at Colby FTS, Appleby-in-Westmorland, Cumbria M169 30/04/2011
Microtunnelling at Hunter Street CSO, Glasgow. M163 30/09/2010
Shaft Sinking at Mill Brow Flood Alleviation Scheme, St Helens. M156 31/05/2010

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