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Another option is what they do in Japan - just get 10X the number of people on it, with all the tools for the entire job and then do it all overnight.
Also, nice to see good old "dude with shovel" in there, a tool that would have looked the same back in the 19th century.
Meanwhile, just down the road from me, we've had a major bridge closed since April of last year, and is due to reopen October 2024....
Videos like this should be a lesson to Civic planners everywhere.
Also, the speed limit on these bypasses is 60 km/h, so they are halving the bandwidth and create massive congestions during peak hours. Probably the reason they stopped using them recently and just close the highway for few hours at night instead.
The bridge is assembled over 2 nights at a motorway exit (so traffic can bypass it by driving off and immediately back on to the road). During night 1 the two end ramps are assembled and attached together to make a short bridge. During night 2 the ramps are driven apart, the central section is built to reach the full length and the entire structure is driven to the final location.
The entire length is 236 meters long providing a working length of 100 meters underneath. The assembled bridge can flex slightly at the joins between sections, and has a turning radius of 2 kilometers.