The main contractor, Balfour Beatty, approached Aquaspira with a request to provide a proposal for an efficient, low carbon solution for a Network Rail culvert alongside a rail embankment at Hook in Hampshire. Sub-contractor DDL installed a dam at each end of the fast-flowing river below the rail line at Hook in Hampshire. This created a 40-metre-long channel to facilitate the delivery of a new 26-metre buried culvert. Needing to overcome the challenge of an incredibly confined space, two lines of Aquaspira 1,650mm composite steel reinforced (CSR) pipe was laid once the water had been pumped out and a metre of silt removed from the riverbed. These were finished with a new 4.8 metre, 350m-wide headwall. The pipes were then backfilled and built up to existing ground line and an access road was installed to provide Network Rail plant access to the above railway line. With Aquaspira CSR pipe, the embodied factory gate and transport carbon was reduced by 48% (12.4T CO₂e¹) when compared to a traditional rigid pipe solution. The lightweight pipes also increased site safety and reduced site installation time. The steel reinforced pipes were designed to withstand the weight of trains, so Aquaspira is delighted to have been selected to deliver the ideal solution for this challenging job. Gareth Green, Aquaspira’s project manager, explained: “The existing open culvert was relatively narrow, so maximising the capacity of the new piped culvert within the available width was crucial. “Aquaspira CSR pipes were specified as, with their 43mm thick wall, the pipe’s footprint width was less than 3.8m and, as each pipe weighs less than 250 kgs, they could be handled and installed with small site machines. This, coupled with the push-fit joints and integral seals enabled quick and simple joining of them within a limited working space, dramatically shortening the programme time.” Josh Moore, DDLWorks Manager, added: “The Aquaspira service and product was excellent. The 1650mm OD pipes were the largest I have installed, and it was made so simple through their design and self-explanatory installation guide provided, along with assistance via phone call at any moment required. I would 100 per cent recommend you to any client or customer and look forward to working alongside again in the future.” Building, Design & Construction Magazine | The Choice of Industry Professionals

Leading civil engineering and building contractor Farrans Construction has completed an innovative tunnelling operation on Northumbrian Water’s Project Pipeline: County Durham and Tees Valley as a specialist tunnel boring machine has completed an underground crossing of the River Tees. The 220m tunnel is part of Phase 1 of a new £155m water pipeline to be constructed while protecting the watercourse and the wildlife that relies upon it. Northumbrian Water’s Project Pipeline: County Durham and Tees Valley will see the construction of around 57km of new pipes connecting Lartington Water Treatment Works with around 200,000 customers across the south of the North East. The specialist tunnel boring machine arrived on site in April to begin its journey between two specially constructed shafts. This operation has created a pathway beneath the river, through which the new pipes will be installed. Phase 1 of the project will connect Lartington, in Upper Teesdale, with Whorley Hill and Shildon, County Durham, and will be followed by a second phase extending the pipeline from Whorley Hill to Long Newton, connecting to the existing network that serves large parts of Teesside. In recent months, work has been carried out by main contractors Farrans and subcontractors Joseph Gallagher, to create the two shafts, one on either side of the river. The western shaft is 8.0 metres in diameter and 32 metres deep, while the eastern shaft is 7.5 metres in diameter and 46 metres deep, the difference being due to the rising topography on the east bank. Dave Mellor, Contracts Director for Farrans, said: “This highly technical and challenging operation has been a best-practice example of innovative civil engineering and we are delighted to have completed it successfully and on schedule. I would like to thank our team, our specialist contractors Joseph Gallagher and our client for collaboratively achieving this important milestone in a project which will secure the water supply to this region for years to come. The moment of break through into the west shaft was a cause for celebration on site following weeks of slow, incremental progress to create the tunnel.” James Dawes, Northumbrian Water’s Project Manager said: “This project has been years in the planning, and ensuring that key strategic crossings, such as the River Tees, are done in the best way possible for the local environment and communities, has been vital. “While it would have been possible to cross the Tees using a pipe-bridge, we had to consider such factors as how this would impact the stunning Teesdale landscape that will be here long after our team have completed the project and moved on. “The use of no dig techniques, tunnelling or directional drilling, is becoming increasingly common in our projects, to reduce the impact on our region’s road and rail networks by reducing the need to dig long trenches. However, this is the first time we have employed it to cross a large river and the teams at Farrans and Joseph Gallagher Limited have done a great job to make this possible. Project Pipeline: County Durham and Tees Valley is a huge investment in the resilience and quality of water supplies to around 200,000 customers, and there is a lot of work to be done, but this is an exciting and important milestone as we progress this strategically important project towards completion.” Building, Design & Construction Magazine | The Choice of Industry Professionals

Balfour Beatty VINCI has completed the excavation of the 22 metre deep west portal for HS2, marking a leap forward on work to build the 3.5 mile Bromford Tunnel bringing high speed trains into Birmingham. The portal at Washwood Heath has been finished in readiness for the two 1,600 tonne tunnel boring machines (TBMs) building the twin-bore tunnel to complete their journeys from Water Orton in North Warwickshire. The huge earthworks operation has taken a team of 130 people from Balfour Beatty VINCI nine months to complete. Groundwork specialists from Coventry-based Duo Group supported Balfour Beatty VINCI with the complex excavation programme to extract 53,400m3 of earth from the ground. The spoil has been transported on specially built haul roads to support construction of the Delta Junction – a triangular section of 13 viaducts in North Warwickshire. The Washwood Heath portal is the deepest of four tunnel portals on the Midlands section of the HS2 route. A two-year programme of ground reinforcement works, delivered by the Bachy Soletanche and Balfour Beatty Ground Engineering joint venture (SB3), began in November 2021 to prepare for the portal’s excavation. The portal is at the start of a 750-metre-long cut and cover structure, which is currently being excavated and built by SB3. This is where HS2 trains will emerge from the tunnel and travel below ground level, before raising up onto a series of viaducts into Birmingham’s Curzon Street Station. ‘Mary Ann’, the first TBM to launch from Water Orton in 2023, is expected to break through the portal wall at Washwood Heath by the end of 2024, with the second TBM ‘Elizabeth’ set to finish her drive by Autumn 2025. At 65 hectares – the equivalent of 100 football pitches – Washwood Heath is one of HS2’s largest construction sites. Next to the tunnel portal, HS2’s Depot and Network Integrated Control Centre will also be built – acting the nerve centre of the high-speed rail network. From this site, trains will be serviced and stored and the real time operation of the railway will be controlled. The site has also spurred the development of a 24 hectare brownfield site which will unlock land for commercial use and logistics space, creating opportunities for employers and the community, and more than 1,000 new jobs for local people. Tim Cook, Project Manager at Balfour Beatty VINCI said: “The Bromford Tunnel portal at Washwood Heath will act as the gateway that will take HS2 trains in and out of Birmingham city centre. At a depth of 22 metres, completing this huge excavation operation is a significant moment for the project, and for the region. “The team is now focussed on the next challenge on this vast site – a 750-metre-long cut and cover structure next to the portal, where HS2 trains will emerge from the tunnel and travel below ground level, before heading into Birmingham.” Alvin Pedzai, HS2 Project Manager responsible for main works civils delivery at Washwood Heath said: “With two tunnel boring machines in the ground and excavation of the Birmingham tunnel portal complete, the complex feat of engineering required to bring HS2 trains into central Birmingham is well and truly underway. “Local businesses have played a huge role in this two-year programme of work, which has been taking shape alongside our plans to build the new network control centre and maintenance depot – the beating heart of HS2’s operation here in Washwood Heath.” On the wider 65 hectare site, over one million cubic metres of earth has been excavated, with the recycled material cleaned and reused to level the ground, paving the way for detailed design and construction of the new maintenance depot and control centre to start next year. By recycling and reusing material on the site, Balfour Beatty VINCI have eliminated the need to import aggregate, a strategy which has avoided over 50,000 lorry movements on local roads, minimising the impact of HS2’s work on nearby communities. Balfour Beatty VINCI have also diverted Wash Brook, which ran north to south through the site. The brook, which connects to the River Tame, is just one of the environmental design features planned for the site to provide local wildlife habitats and enhance its aesthetic appeal. Building, Design & Construction Magazine | The Choice of Industry Professionals