At Chelsea Embankment Foreshore, we are working across two sites, known as the ‘north’ and ‘south’ sites.
Our south site is located on the foreshore where we have constructed a cofferdam, a dry working area built out into the river. Within this cofferdam we have excavated a 45m-deep shaft, which will drop raw intercepted sewage to the depth of the new super sewer.
From the base of this shaft, we have constructed a 55m-long tunnel to connect the site to the main super sewer tunnel being constructed deep below the River Thames. We are currently installing the concrete secondary lining on top of the primary lining within this connection tunnel. The secondary lining will protect the structure against erosion as sewage passes through it.
We have also excavated an interception chamber, a structure that will intercept, combine and transport sewage from the existing sewers towards our shaft. We have poured a concrete base slab to the bottom of this structure to secure it and give it its final shape.
We have been installing metal sheet piles deep into the ground within our cofferdam. The sheet piles will form the outline of our de-aeration chamber which will be used to which extract gasses within the sewer system and will form part of the infrastructure servicing the new super sewer. We will be using a combination of the vibro and impact methods to insert the piles.
On our north site – across the road from our south site - we have completed excavation of our 23m-deep overflow weir chamber. This chamber will receive the sewage that overflows from the Low Level 1 sewer and direct it towards our shaft on our south site via a connection culvert tunnel, which is yet to be constructed.
If you have any questions about this or our site at Chelsea Embankment Foreshore please get in touch with our helpdesk on 08000 30 80 80 or [email protected]