21ST-CENTURY DESIGN
Coordinated trench and drainage runs ‘virtually’, ‘before’, and (inset) in reality, ‘after’.
the overall extent of excavation, and thus any implications for undermining of nearby structures.
After some fruitful coordination meetings to iron out the trickier areas and pinch points, a set of plans and detailed sections taken at regular intervals all along the route were issued for construction, which looked no different from conventional CAD drawings.
Underground service trench The purpose of the underground service trench was to allow distribution of the steam mains and other central services from the primary trench in the main building into Therapies. The most direct and realistically possible route was across the road between the two buildings, but,
being a road, this was home to lots of existing drainage and, by the time we came to design it, it was also home to the new fibre optic cable. From the topographical survey – verified by CCTV where this was unclear – we modelled the existing drainage and added our proposed new drainage, and the fibre optic cable to get a feel for where the trench might fit.
The structural concept of what the trench should be was simple to decide on – an in-situ reinforced concrete base and sides, with planks spanning over the top, and with manholes in key locations for frequent maintenance access, but also the facility to lift all the planks for major maintenance. The in-situ trench and plank lids were all modelled in 3D. The planks
An extract from the underground coordinated services model.
were set at a slope to match the road falls, and the base of the trench set to a fall to allow incoming water to gather at a sump for pumping out. The size and internal dimensions of the trench were coordinated with the mechanical and electrical engineer.
Finding an optimal route The issue now was how to find the optimum route for this trench from the main building into the Therapies building, that would avoid, or, at the very least, limit, clashes with the services we had modelled. To do this as a ‘paper’ exercise would have been very time-consuming and ‘clunky’. With 3D models, however, it was relatively easy to home in on the best route, and, importantly, to provide
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October 2019 Health Estate Journal 103
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