Potomac River Tunnel

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The Project
CJL Construction Ltd took on the installation of deep drainage and utilities during the groundworks phase for a Persimmon Homes development of 80–100 homes. For this project, CJL brought in Conquip to deliver a temporary works service and supply a range of shoring equipment.
Conquip delivered its ‘Standard Shoring Solutions’ temporary works design, while CJL hired a variety of Trench Boxes, Lightweight Trench Boxes, and Manhole Boxes. They also used ancillary trench access and safety equipment. On-site, the team operated an Excavator Pipe Laying Hook to unload and manoeuvre pipes, and they deployed Road Plates to manage the uneven terrain.

The Challenge
Ensuring trench safety is critical on groundworks projects and becomes difficult without the right equipment. To maintain safety during trench excavation across the site, the experienced CJL team installed Conquip’s shoring boxes. This setup allowed them to lay foul water and storm water drainage pipes across the 1.5-hectare site in Yatton, near Weston-super-Mare.
CJL also needed to unload and manoeuvre heavy concrete pipe sections from delivery trucks into position—another key challenge on the site.
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The Solution
With a fast-paced 12-week schedule to maintain, CJL requested a temporary works design before starting on-site, enabling the creation of a detailed planning schedule.
Conquip’s design supported trench excavation to a depth of 2.3 metres in heavy clay soil. The included shoring boxes enabled CJL to lay the pipes safely and efficiently. Thanks to their robust construction, Conquip’s shoring boxes allowed the team to install them quickly while ensuring a safe working environment for operatives in the trench.
CJL used the Trench Access Platform and the Davit Fall Arrest System to guarantee safe access in and out of the trench via the ladder. The Excavator Pipe Laying Hook allowed the team to manoeuvre pipe sections with speed and precision, improving overall site productivity.
Conquip’s adaptable equipment range met the site’s specific needs, accommodating different pipe sizes and applications to provide CJL with a complete end-to-end shoring solution. Click here to find out more.

Project feedback
"We've been working with Conquip on four or five of our sites that need shoring boxes. This one in Yatton is for our client, Persimmon Homes. Having just moved over to Conquip as our shoring partner, we're very impressed. The temporary works and design team are quick and efficient and the ordering process and customer service for the boxes we needed was seamless - you don't have to give them very long to get the order here on time. On this project, they have delivered exactly what they said."

Graham Cheeseman | Drainage Construction Manager, CJL Construction"
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Persimmon Homes Development

CJL Construction Ltd for Persimmon Homes Severn Valley

Persimmon Homes Development

Somerset, UK

Temporary works design & shoring kit supply for housing development in Somerset

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Setting the stage: An overview of the project
This mixed-use development involves the transformation of the original shopping centre into a London Underground Integrated Ticket Hall (ITH), new retail and leisure facilities, university buildings and residential units. Due to the size of the project, the basement construction methodology is technically complex, so it was an exciting challenge when we were asked to work on the design for the temporary propping.
Complexities of engineering one of London’s biggest basements
Morrisroe was responsible for the excavation and construction phases of the basement along with the construction of the above-ground RC structures. We were tasked with designing and delivering the temporary works propping solutions, in collaboration with KDL, Morrisroe’s in-house engineering team.

The project posed significant challenges due to high loads and tight tolerances that required complex solutions. Due to the sheer scale of the project, it meant that our team needed to collaborate very closely with the project team, to achieve the best design, but then adapt as work progressed.

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Innovation at work: Conquip's bespoke solutions
To assist the project’s build methodology, we introduced bespoke elements such as a double-to-single waling beam connection to maintain continuity where the double stacked waling beam changed to a single level. A bespoke bracket was also built for corners where the angle was too obtuse to accommodate a standard prop.

"One of the things that separates Conquip apart from others is the speed at which we can deliver bespoke items. If a project needs something adapting on site, then our in-house teams can design, manufacture and deliver that part to sites, preventing downtime on the project."

Rob Law | Head of Temporary Works Engineering, Conquip

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The power of collaboration
The project was a testament to the power of collaboration between Conquip, Morrisroe, and Multiplex. Conquip's teams were actively involved in site meetings, adapting their designs as work progressed. This proactive involvement ensured that the project did not experience any delays in relation to the propping scheme.

"Conquip and Morrisroe, along with Multiplex work together to make sure we had the most efficient design possible."

Keegan Hudson | Construction Manager, Multiplex
Championing sustainability
The project also showcased sustainability through the reuse of props and value engineering the design to reduce the number of propping deliveries and collections required.

"We were able to value engineer the propping requirements for the project, reducing the amounts required. This not only helped with buildability and maximized the potential of the props, but also had a big impact on sustainability."

Ali Solki | Project Engineer, Morrisroe
Project Update: March 2024
What a difference a year makes!

Taken 12 months later, these photos show the tremendous progress at Elephant and Castle Town Centre Redevelopment Project in London.  Propping one of the biggest basements in London, our team have had to overcome a multitude of challenges: the sheer scale of the excavation, working within inches of the underground infrastructure, city centre logistics and deliveries, complex corner details requiring bespoke parts - and a whole lot more.

This is one of Conquip's biggest and most intricate projects to date, where we have worked in close collaboration with Morrisroe and Multiplex from the early stages.

As the photos show, collaboration in the whole supply chain is the key to success.

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Elephant & Castle

Morrisroe and Multiplex

Elephant & Castle

London, UK

A landmark, complex construction and redevelopment masterplan that is a testament to collaborative engineering.