In general, a tower is a structure that is tall in proportion to its width and length, but within the context of this guidance a tower is a scaffolding structure supported by four standards. Three conﬁgurations of tube and ﬁtting towers are deﬁned: tied towers, free-standing towers and securely-butted lift shaft towers. A free-standing tower is a scaffold tower that is not tied to a supporting structure. This type of tower can be erected within the dimension limits deﬁned in this guide, which depend on whether the tower is to be used within an enclosed building or in an area exposed to the wind.
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