HOW QUICKLY IS CONCRETE ADOPTING BIM?
THE CONCRETE SECTORS BIM JOURNEY IS PROGRESSING AT DIFFERENT SPEEDS; PRECAST SPECIALISTS ARE EMBRACING THE TECHNOLOGY, BUT ITS EARLY DAYS FOR THE RC FRAME SECTOR.
BIM relationship with concrete to date is a tale of two halves. While BIM use on reinforced concrete frame projects has been limited, as CMs research with Trimble on p28 shows,
the precast sector is quickly discovering the technologys benefIts.
'Precast is perfectly placed to exploit BIM,' says Matthew Butcher, environ-mental and technical fficer at British Precast.“Precast firms are working in a controlled factory environment, which is ideal for the principles of design for manufacture and assembly.'
'The government is prioritising use of offsite manufacturing, and now wants a platforrms system of standardised components, while major clients like Heathrow are also moving in this direction.'
BIM software house Trimble sees exciting digital possibilities for the precast sector. Business manager Ismail Makda says: 'Digital construction can facilitate the worklflow between different stakeholders on a project. An architect can send their 3D model to the precast firm, who can create a highly detailed model with all the embeds,einforcement and so on, while the engineer can use the model to assess the structural characteristics, such as wind loading.'
FP McCann became the first precast specialist to achieve BIM Level 2. accreditation with BSI, two years ago, and completed its first BIM Level 2 project last year, a warehouse job at the Daventry International Rail Freight Terminal (DIRFT).
“The shift to working in a data-rich 3D envronment has meant signifcant additional work, training people innew software and developing components with embedded data,' explains senior technician Colin Mackenzie. 'Benefts have included clash detection, for example, alowving steel frame ssues to be highlighted early, and quicker design.'
The company typically works with the architects 3D model andMackenzie says federated models are rare. 'We generally work at LOD level of detail of 4or 5,'he says. 'More recently, we have started receiving BEPs BIM execution plans, where the LOD and LOD level of information, have been specifed for various project stages.'
On the DIRFT scheme, Mackenzie . adapted Trimbles Tekla software to speed up design of bespoke precast units.
“There were, for example, 77 T-wall sections required, of which 30 were bespoke,' he explains. 'Each one would have taken two hours to model individually. Instead, using the custom components editor in Tekla, I defined possible parameters for the bespoke elements. Then, when the designers began work, they could define the unique requirements of each unit, such as dfferent dimensions, fixing positions. “Working this way, we designed each unit in just two minutes. The total modelling took less than a week.'
Mackenzie says FP McCannsgreatest gain from BIM adoption has been the parallel development of internal production processes.
“Using the embedded data in our Tekla software, we have been able to transfer information to lasers alwing quicker and easier mould set-up,' he says.“Additional investment in data driven mesh/rebar machines, adopting simpler reinforcement configurations, will accelerate rebar cage fabrication. . On box culverts, weve reduced cage fabrication time by 50-60%.'
The next step in FP McCanns BIM transformation is coordination with logistics. 'Software firm StruSoft has supplied us with their Impact system, which links with our modelling data, and allows our planners to assign units to casting beds in the factory and then link up with deliveries to site,' Mackenzie explains.
Meanwhile, Creagh is also seeing advantages from implementing BIM across its business. Connor McMahon was project manager on the companys Sheffield HSBC project, where Creagh was brought in by main contractor BAM with just 16 weeks notice to deliver three concrete cores.
Eachone was34.5mtallandcomprised 17 precast sections, consisting of flat
walls, 'C-shape' units, boxes, stairs, landings and capping slabs. The largest sections were 8m by 4.6m across and 2m high, weighing around 27 tonnes.
Creagh modelled the cores in Revit to L0D 5 then worked ollaboratively on the designwithother project team members.
“The model became an interactive tool, so we could visualise the product on the project virtually, before the prefabricated component is cast in the factory and arrives on site,' McMahon says. 'Creagh uploaded data drops to the common data environment [CDE ] used on the project, so this provided Bar with evidence of how the precast cores had been developed.'
He says a rise in productivity has increased Creaghs trust in BIM: 'We can work quicker, with more accuracy on cost build-up for estimates, reduced lead times, and improved timeframes during the critical path process.
“We are seeing better quality control, with a reduction in remakes and miscasts, plus we can be sure of ordering the exact quantities ofcast-in components. BIM has promoted more sustainable and lean manufacturing processes internally.'
Precast firmTechrete usedTrimbles Tekla package on the Vamp;A Dundee. “As there were no straight external walls, the challenge of designing, manufacturing and nsalling the 2,400 precast concrete panels, which brought the geometrically complex design to life, was recognised at the beginning of the project,' explains Makda.
“Therefore, BIMwas usedthroughout the project, with every precast plank modelled by Techrete. This alowed the design team to search the model, zoom in and spin the plank around to ensure it ftted the design.'
While the Vamp;A Dundee has been a showcase for BIM, Makda feels there is still“work to do to enable external stakeholders to collaborate more effectively through digit
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