Heathwall Pumping Station

Site information

Thames Water and Tideway have completed works to upgrade the existing water and gas mains under Nine Elms Lane. This work was vital to prepare the essential utilities for our main works construction in the coming months. We have begun our main works construction at Heathwall pumping station. We will soon begin works such as site clearance, sewer outfall diversions, investigative boreholes and preparation for the construction of the main shaft.

Heathwall Pumping Station

February 2020

At our Heathwall Pumping Station site, we are digging two shafts to intercept the sewage overflows from the Pumping Station and the combined sewage outlet (CSO) and connect these to our new tunnel being constructed underneath the River Thames.

Both shafts are being constructed using the same method which consists of three phases. The first two phases of each shaft use concrete segment rings to line the structures. These were initially pushed into the ground using jacking gallows before the material within was excavated. Once excavation reached a certain depth on each shaft, we grouted these rings in place and changed to an underpinning method of lining the shaft, where the rings were installed below the existing structure. The third and final phase of lining the shaft was sprayed concrete lining, where we excavated down exposing the ground face before spraying shotcrete which set into the primary lining.

Our shaft to intercept the Pumping Station overflows has been dug within our cofferdam, a dry working area built out into the river. This shaft has been excavated to its final depth of 26m below ground and we have poured a 1.5m thick concrete base slab at the bottom of the shaft to form a concrete plug, providing the structure with stability. From this shaft base, we are now preparing to dig a 42m long tunnel which will connect to our second shaft, which is being constructed in-land.

Our second shaft is being constructed to intercept the CSO and has been excavated to 48m below ground. Once at the final depth of approximately 50m below ground, we will pour a 3m thick concrete base slab at the bottom of the shaft, which will secure this structure’s shape. Following completion, we will begin to dig a tunnel from the bottom of this shaft to connect into the main new tunnel currently being built deep below the River Thames.

If you would like to receive works updates via email, please contact [email protected]


What are our working hours?

Standard working hours

08:00 - 18:00 Monday - Friday

08:00 - 13:00 Saturday

Extended working hours

We are currently working 24 hours, Monday - Friday

The next CLWG meeting for Kirtling Street and Heathwall Pumping Station will be held on Thursday 19 March from 19:00 - 21:00 at our Kirtling Street site offices.

16 December, 2019 - CLWG Minutes

16 December, 2019 - Presentation Slides

5 September, 2019 - CLWG Minutes

5 September, 2019 - CLWG Presentation slides 

Previous minutes are available upon request

If you have any questions about this site or the Project, please contact the Tideway Helpdesk anytime on 08000 30 80 80 or email [email protected]

  • All static machinery and plant is screened or enclosed
  • Vehicle movements outside of standard hours are restricted
  • Hoarding has been erected on the site boundaries
  • Push (silent) piling is used wherever possible

There are lots of ways to find out what’s happening at this site, you can:

  • Call our 24 hour Tideway Helpdesk 08000 30 80 80 or email [email protected]
  • Take a moment to read the latest updates on the noticeboards on our hoardings.
  • Email our dedicated Community Relations teams available to answer your questions or meet with you, via [email protected]
  • Join our regular Community Liaison Working Group meetings, to attend the meetings or receive the minutes and presentations from past meetings, email [email protected]

You can also follow our progress and what we're doing in our local communities on Twitter, Instagram and Facebook

Submissions to the Council 
We are making a number of submissions to the London Borough of Wandsworth as part of the consents we need to secure before starting different phases of work at the Heathwall site. These submissions are available to view on the London Borough of Wandsworth's planning portal. Please click here to be redirected to the portal. If you are interested on commenting on these submissions, please ensure you respond directly to the London Borough of Wandsworth.

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