1.40 Taylor, Wamuziri, and Smith (Civil Engineering, 2003) studied operation of Big-Canopy Systems used in building construction. A big canopy erected at the construction site provides a comprehensive overhead delivery system and improved working environment with more advanced construction manipulators and control systems. Such a system includes columns, beams, slabs, interior wall elements, drainpipes, air-conditioning ducts, and so on.

Big construction corporations expect reduction in construction costs of large structures can be reduced and efficiency improved by use of a Big-Canopy system compared to the traditional methods. Table below shows the labor (mandays per m2 floor area of superstructure erection work) required with different construction techniques for a superstructure erection. Make an appropriate graph and comment on your findings.

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Technique Conventional method System framework method PC concrete and tower crane Big-Canopy project Y Big-Canopy project K Big-Canopy project H Labor Man-Days/m Floor Space 100.0 72.9 38.6 25.6 26.0 20.0