Crossrail's huge BIM+geospatial model targeted on operations and maintenance

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The UK Government as part of its building information modeling (BIM) initiative has said repeatedly that it expects the big payoff of a digital model, estimated at more than 40% savings,*will be*during operations and maintenance, typically representing 80% of the total cost of a facility.* Companies such as BAM who do Design, Build, Finance and Maintain (DBFM)*projects report significant benefits from full lifecycle BIM + geospatial. *But there is little if any*quantitative evidence supporting this conjecture.* I have asked people from Finland familiar with the very early BIM developments in that country*if there were studies of*the benefits of BIM for operations and maintenance, but apparently the BIM focus there*has been*entirely on design and build.
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Crossrail with a budget of £14.8 billion is the biggest engineering project in Europe.* It involves 42 km of tunnels beneath one of the most densely populated parts of Europe.* It has wider tunnels* and its 40 stations*have longer station platforms*than the Tube has.* Crossrail trains are expected to start running next year and the full network*should be open by 2019.
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But the most interesting aspect of the Crossrail project is a 3D digital model with associated asset data that has not only been used during design and construction, but is intended to be used for operations and maintenance.* Crossrail*appears to be the first major project that may be able to provide support for the conjecture that the biggest benefits of BIM are for operations and maintenance.
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The Crossrail model is comprised of spatial and non-spatial data with links between the two.* The spatial data is made up of more than 250,000 3D BIM models as well as as-builts, together comprising a few terabytes. As construction of each facility is completed as-builts are collected by point-cloud survey using laser scanners.* The point clouds captured in the survey are compared to the design and divergences that need resolving are recorded for fixing. The detailed asset data and documentation add an additional 5 terabytes.* This represents one*of the World's largest BIM model.* A critical*aspect*of the spatial database is that*all assets are geolocated so that workers can query a particular location of London on a map and then navigate to the Crossrail assets there.
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The model is intended to become a crucial tool for monitoring, operating and maintaining*Crossrail’s systems once the railway is running.* Sensors monitor various aspects of the railway's operation and remote-controlled devices can change operating parameters from a central control room or from a handheld device.* Managers can view this information within the 3D model and can zoom in on an area which needs attention.* Crossrail is testing low-power wireless smart sensors called Utterberries that can monitor strain, temperature, humidity, acceleration, and other aspects of a facility. Utterberries weigh 15 grams and are smart - they have an ARM processor on-board and can operate for more than a year on one charge.* One of the coolest capabilities of the digital infrastrucure*is an augmented-reality interface which allows workers to hold an iPad up to a wall or floor and see a view of the infrastructure (electricity, water, and communications) under the floor or behind the wall.



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