build building construction construction site crane cranes diggers machinery site steel structure angles building-construction building-site building-work buildings construction-site construction-work danger external height heights high lifts metal-work pipes protected protection railing rails safety scaffolding security steel-scaffolding tall work work-safe workmen bucket building site building yard damage demolition destruction digger dredge dump excavator field garbage hard hat required job-site left over lot over power ruin shovel stones too late yard bricks brickwork development frame frames framework home home-units homes suburban urban wall walls mortar rough building construction building work construction work metal work steel scaffolding cabin cables hoist hoisting lift lifting light linear lines modern platforms raising skip workers working additions alterations angled industrial patterned patterns reinforced reinforcing safe secure