Self supported
Temporary fixation of voussoirs (cantilever) while the system is not yet in equilibrium is guaranteed by the geometry of the voussoirs, as seen in. In projects such as Robotically Fabricated Thinshell Vaulting (Kaczynski et al., 2011) or Wave Jointed Blocks (Fernando et al., 2017), which both use anticlastic ruled contact surfaces to prevent slippage, assembly does not require external supports other than putting each block in position, resting and locked by the previous positioned voussoir.
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