Catalan vault
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The Catalan vault, also called the Catalan turn or Catalan arch, is a type of low arch made of plain bricks. often used to make a structural floor surface. It is traditionally constructed by laying bricks lengthwise over a wood form or "centering", making it a much gentler curve than has generally been produced by other methods of construction.
It is a traditional form in Catalonia (where it is widely used), and has spread around the world through the work of Catalan architects such as Antoni Gaudí and Josep Puig i Cadafalch.
A study on the stability of the Catalan vault is kept at the archive of the Institute of Catalan Studies, where it is said to have been entrusted by Puig i Cadafalch.