viraldazed.com
This Innovation Can Build a Tunnel in Less Than 24 Hours
This is the so called 'Zipper Truck' and it can quickly assemble tunnels and archways 'like crazy'. How does this 'magic' work? It locks pre made concrete blocks which are designed to fit tightly together. A kind of Lego-like arch blocks. Thanks to this method, mortar is not necessary any more. The main advantage of this tunnel-creating invention? Construction time is reduced by up to 90% and the traditional lengthy and tedious process is now just an old memory...wow, almost a miracle (Ed.). For example, in less than 24 hours they can build up to 1,312 ft (400 metres) of