Aquaspira delivers low carbon solution for Network Rail culvert extension

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.”