excavator working and unloading earth soil and rocks..industrial bulldozer, excavator and track type excavator working on construc

activity backhoe boring bucket building bulldozer clay concrete construction development digging dredger dumper duty earth earthmover engineer engineering excavation excavator foundation freeway gravel heavy heavyduty highway hydraulic industrial industry loader loading machine machinery moving process quarrying road rocksindustrial site soil structure sunlight track transport transportation truck type unloading vehicle working workplace