Sector:
Utilities: Client:
Thames Tideway: Main Contractor:
Ferrovial Laing O'Rourke: Location:
London

Delivered on time and delivered on budget;
Multiple challenges overcome through excellent team attitude and a positive client relationship,
Featuring the longest Sprayed Concrete Lining (SCL) drive on the entire Tideway scheme, to date.

Contact usTo hear about our experiences and how we can help you.

Project Overview

JGL were commissioned by main contractor FLO to deliver a CSO (combined sewer outfall shaft) alongside an SCL connection tunnel into the Tideway main drive.

Without the skills and commitment from our brilliant team along with the SCL mix design – we simply would not have been able to consistently pump from a single point onto the surface.

Challenges

The most significant challenge on this project was in the 250m-long connection tunnel. The diameter and length of the drive meant that we had to be very selective with the choice of plant used to complete the drive. Initially, the Wimmer Blue Badger was used to excavate the first half of the tunnel and then we reverted to the SPA Schaeff 112 for the second stage.

The second challenge of getting concrete to the spraying robot was significant considering the distance the material had to travel from the silos on the surface (300m). Initially, concrete remixers were considered however, the diameter of the tunnel eliminated this option as the remixers simply would not fit.

That left the option of pumping from the surface which introduced the risk that the Meyco Suprema pumps might not have capacity to pump the concrete the required distance. To overcome this, we had the backup plan of stage pumping with additional pumps and the fabrication additive storage gantry.

The JGL team had the right mindset to overcome the challenges during the completion of the project. Finding new ways of working and still delivering the project to a high standard.

Added Value

To eliminate several risks associated with fixing cut-and-bent reinforcement in the CSO shaft base slab, we engaged Express Reinforcement (ER) to explore the option of prefabricating the base-slab reinforcement. ER subsequently redesigned the reinforcement, introducing multiple benefits including the removal of key implementation risks and a significantly accelerated installation timeframe.

Community Involvement

A fundraiser, led by the SCL Supervisor at Falconbrook Pumping Station (FALPS), was held to support the local children’s nursery located next to the site. With many residents and families heavily affected by the impacts of Covid‑19, the team aimed to raise money to provide Christmas presents for every child attending the nursery.

A total of £600 was raised by the project team, with an additional £150 donated by JGL.

To hear about our experiences and how we can help you.

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With an excellent track record and delivery on the Tideway project, JGL were appointed to push 30m of pipe beneath the river Thames using the trenchless tunnelling technique of pipe jacking.