Shaft Sinking at Bryn Cowlyd Water Treatment Works, Dolgarrog, Wales. M236

Client
Welsh Water

Project
Significant upgrades to Bryn Cowlyn Water Treatment Works.

Description

The project involves delivering significant upgrades to Bryn Cowlyn Water Treatment Works that will safeguard the supply of water to around 100,000 people in the Conwy valley and North Wales coast.  The design includes upgrades to hydro-generation dissolved air flotation systems, rapid gravity filter units and high lift pumping stations.  The team has been challenged to complete this complex £31 million scheme ahead of the 2017 delivery date set by the Drinking Water Inspectorate.

Description of Works:

DN10500 x 7.5m deep jacked caisson to provide an emergency pumping station.  Mass concrete plug and reinforced concrete base.

A bespoke temporary suspension system was designed, manufactured, installed and operated by AEYTS to prevent the shaft structure sinking into the very soft ground.  This system supported the 250 ton shaft prior to construction of the concrete plug and RC base.

Ground conditions: Wet alluvium

Study Project Date  
Shaft Sinking at Bryn Cowlyd Water Treatment Works, Dolgarrog, Wales. M236 06/02/2017
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