The massive basement excavation measures 14 m deep and 70 m wide.
Shoring solution eases work on vast excavation
Altrad RMD Kwikform has engineered a groundbreaking shoring solution for a massive Abu Dhabi excavation project, one of the largest in the company’s history. The Tubeshor system, chosen for its efficiency and safety, accelerated the project timeline and mitigated site risks, including water proximity.
01 December 2024
Altrad RMD Kwikform (Altrad RMDK), a leading provider of formwork, falsework/shoring, heavy-duty support, ground shoring and safety and access systems, has supplied a ground shoring solution to support a challenging large-scale excavation – one of the largest of its kind in the company’s history – in the UAE capital.
The project features a maximum depth of 14.25 m, and an approximate volume of 111,050 cu m. The Tubeshor solution was chosen for its ease of use and installation, improving productivity on site while mitigating the risks posed by the challenging site environment.
Located in Abu Dhabi, the project aimed to establish a vibrant new city centre by seamlessly integrating commercial and residential spaces. This extensive development is set to redefine the urban experience in the UAE’s capital. At the heart of this project was a critical infrastructure component: a massive basement excavation measuring around 14 m in depth and 70 m in width.
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Altrad RMD Kwikform was tasked with delivering a system that could handle the extensive loads and provide robust support throughout the excavation process. This role was crucial in ensuring that the shoring solution not only met the technical requirements, but also adhered to the project’s timeline and budgetary constraints.
“The sheer size of the mixed-use development presented a significant engineering challenge,” states Vijay Patil, Lead Engineer for Altrad RMD Kwikform in the Middle East and India. “Traditional shoring methods would have required a large number of props, resulting in high material costs and reduced workspace within the excavation site. Given the scale and complexity of the excavation, the contractor required a system that could be assembled and disassembled quickly to maintain the project timeline.
“What’s more, the project is situated next to water, which posed logistical and environmental hurdles. The proximity to the water required careful planning to prevent contamination as well as mitigating risks associated with flooding and erosion.”
THE SOLUTION
For this excavation, Altrad RMD Kwikform provided 387 tonnes of Tubeshor material consisting of 24 Tubeshor props, each with a 1,060-mm diameter, specifically designed for heavy-duty applications. The Tubeshor system’s strength and modular design made it the ideal solution for the project’s complex requirements, Patil says.
The props had a maximum span of 67 m and a prop spacing of 7.5 m, which was then supported by a single plunge column along its length, with the equipment on site for over 12 months. Weldable stub ends were used on one end of the prop to reduce welding and installation time on site, while allowing for a certain amount of length adjustment.
“The use of Tubeshor components enabled a value-engineered strutting design, which brought significant benefits to the project. By utilising high-strength S460 steel, the Tubeshor system provided exceptional structural support giving unprecedented axial load capacity, with the maximum load acting on the prop of 3,295 kN.
“This also offered a 30 per cent reduction in the amount of steel needed, not only lowering costs but also maximising the available excavation space, allowing contractors to work more efficiently. Bolted connections also improved the ease of use and reduced installation and dismantling time,” Patil explains.
The ability to easily adjust and reconfigure the props on-site meant that the system could be tailored to meet the specific needs of the excavation as it progressed. The original customer design had featured 28 plunge columns, but the team were able to reduce this to 10. This flexibility reduced the time and effort required for assembly and adjustments, streamlining the project.
“The implementation of our Tubeshor system on this mixed-use development project has had a profound impact on the delivery of this excavation. Its strength, design and efficiency ensured the team stayed on schedule and within budget.
“The sheer scale of the project showcases Tubeshor’s engineering and adaptability in providing robust and efficient support for complex construction projects, and this is one of the largest excavations in Altrad RMD Kwikform’s history,” Patil concludes.
Altrad RMDK provides engineering solutions in the specialist field of temporary structures, needed to deliver major infrastructure and building projects. It designs, hires, and sells formwork, falsework/shoring, heavy-duty support, ground shoring, safety & access systems to the construction industry, key sectors include civil engineering and infrastructure, ground works, energy and industrial, commercial, and multi-storey residential buildings.
