Reinforced concrete construction: Cast in place reinforced concrete multi-story structure, seen from outside the fence. Readymix concrete truck, right foreground, delivers concrete to concrete pump/elephant trunk that is placing concrete in center of photo. Tower crane on right is moving concrete formwork panels on upper floor in center. Tower crane, left center is lowering column reinforcing bar cage onto top of lower floor cage, with two workers supported by lower cage steel guiding it into place. Wood posts and welded tube scaffold shores are in place to support upper concrete floor. Column reinforcing cages are placed loosely in column positions on upper floor, to be aligned later. Reinforcing ironworkers and carpenters are placing forms and reinforcing for upper floor slab. Denver, Colorado, December 2005.

Reinforced concrete construction: Cast in place reinforced concrete multi-story structure, seen from outside the fence. Readymix concrete truck, right foreground, delivers concrete to concrete pump/elephant trunk that is placing concrete in center of photo. Tower crane on right is moving concrete formwork panels on upper floor in center. Tower crane, left center is lowering column reinforcing bar cage onto top of lower floor cage, with two workers supported by lower cage steel guiding it into place. Wood posts and welded tube scaffold shores are in place to support upper concrete floor. Column reinforcing cages are placed loosely in column positions on upper floor, to be aligned later. Reinforcing ironworkers and carpenters are placing forms and reinforcing for upper floor slab. Denver, Colorado, December 2005.