Metro Tunnel

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The Project
CJL Construction Ltd was selected to carry out the installation of deep drainage and utilities in the groundworks phase, prior to the construction of a Persimmon Homes development of 80-100 homes. For this project, CJL enlisted Conquip to supply a temporary works service and a range of shoring equipment.

Conquip provided its ‘Standard Shoring Solutions’ temporary works design and CJL hired a range of Trench Boxes, Lightweight Trench Boxes, Manhole Boxes, as well as ancillary trench access and safety equipment. In addition, an Excavator Pipe Laying Hook was on-site, for unloading and manoeuvring pipes and Road Plates were used on the uneven terrain.
The Challenge
Trench safety is vitally important on groundworks projects and can be problematic without the necessary equipment. To support trench excavation around the site with safety in mind at every point, the experienced CJL team installed Conquip’s shoring boxes, allowing them to lay foul water and storm water drainage pipes across the 1.5-hectare site in Yatton, near Weston-super-Mare.

Another challenge CJL faced was unloading the concrete pipe sections from delivery trucks and manoeuvring them into position.

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The Solution
Keeping to the fast-paced, 12-week long project schedule was vital so before work started, a temporary works design was requested, to allow planning schedule to be created.

The solution designed by Conquip supported the trench excavation to a depth of 2.3 metres in heavy clay soil and shoring boxes were included to facilitate safe and efficient pipe laying. The robust design and build of Conquip shoring boxes allowed CJL to install them maintaining speed of installation and providing a suitable safety barrier for operatives to lay the pipe sections in the trenches.

The Trench Access Platform and the Davit Fall Arrest System guaranteed safe movement of the site team in and out of the trench using the access ladder and the Excavator Pipe Laying Hook meant that the site team could move the pipe sections quickly and easily, increasing on-site efficiencies.

Our range of equipment is adaptable to varying site requirements, accommodating a range of pipe sizes and applications, providing customers with end-to-end shoring solutions. 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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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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