Construction tower cranes are the focal points of jobsites throughout the world. They are the backbone and workhorses of most large construction sites. If they aren’t working; the jobsite isn’t working to it’s full capacity. Most of the questions I’ve received from people in my life who aren’t in construction tend to focus on the subject of tower cranes. May 06, 2019 · DIY Gantry Crane Styles: Fixed, Adjustable, Telescoping Fixed, Adjustable, and Mobile DIY Gantry Cranes Whether you are a fabrication shop , warehouse, auto center, home shop or other business in need of heavy lifting a Portable Gantry Crane will more than likely get the job done for you. A log tong is used to lift logs.