base of a new inside hall under construction

architectural articulated assembly build builder building cherry consctruction constructing construction contractors crane duty elevate elevator engineering equipment erection erector fire girders hall hard harness heavy height high hydraulic industrial industries industry inside installation installers isntalation labor lift lifter manual mechanical metal mobility outdoor person picker platfom platform platforms preparation project roof safety scaffolds scissor site sites springs steel structural structure support tall technology unfinished utility vertical water work worker workers working workman base