The bridge has 16 arches and 15 pillars, each shielded by ice guards. The example chosen in this animation is a real Medieval bridge-the Charles Bridge across the Vltava river in Prague, Czech Republic.Ĭonstruction of the Charles Bridge started in 1357, under the auspices of King Charles IV, but it was not completed until the beginning of the 15th century. This process has been beautifully recreated in a 3D animation by Praha Archeologicka, a Prague-based project of the Institute of Archaeology of the Czech Academy of Sciences (CAS), Prague, and the National Heritage Institute. Finally, paving was laid made of hard rock. The arches were reinforced by putting several layers of stones over it up to the level of the bridge deck.
Once the keystone was in place, the falsework was removed and the arch stood held together by its own weight. To build the arches, wooden falseworks were erected and precisely cut sandstone or granite blocks were placed over this falsework. Once the foundation was prepared, the masonry of the pillar could be started.
This grate was fixed with large round stones, which were interconnected by wrought iron bars. Upon this, a wooden foundation grate composed of oak beams and planks was placed. The subsoil was most likely reinforced using wooden piles driven with a pile driver. Water was then pumped out from the pit by a water wheel. This was made watertight using mud and reinforced with sand. Photo: Adisa/ĭuring middle ages, the cofferdam was built using several rows of logs driven into the mud. Upon this ground the piers of the bridge are erected. First a cofferdam is constructed on the riverbed and the water inside this enclosed structure is pumped out, exposing the muddy button. Building a bridge over water is a daunting task, and despite the many technological progresses, the basics have remain unchanged since ancient times.
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