21st Century floors

摘要

For 40 years, construction guidance on concrete industrial ground-floor slabs has recommended that floors are been designed, built and measured by considering the movement and direction of materials handling equipment, such as forklift trucks. Free movement tolerances were introduced on floors where forklift trucks could turn and travel randomly across a floor, and defined movement tolerances were put in place on floors where trucks were restricted to travelling in one path only. For both free and defined movement floors, tolerances were put in place based on the height of racking systems.More than 30 years ago, the F-number system was recognised by the American Concrete Institute as the means of controlling flatness and levelness for free movement floors. In the UK, Technical Report 34 introduced tolerance limits for surface regularity. Both the UK and US adopted statistical representation for free movement floors, recognising two things: that measuring the entire floor surface for every possible combination of traffic direction was simply not practicable and that the manufacturers reported 'accuracy' of surveying equipment was not an appropriate means of determining measurement equipment.