Monument in Homage to Amancio Williams - [eCV] Opera Publica
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In 1966 Williams adapted and built a similar design for the Bunge and Born's Exhibition Pavillion at the Argentinean Rural Society Centennial Fair in Palermo, using for the first time the vault shells, but reducing its plan dimension and thickness. “The Pavilion was built creating a virtual space under the vaults where a ...

Originally designed by the architect Amancio Williams as a Monument in memory of his father, the music composer Alberto Williams for the hundredth anniversary of his birthday, tenth of his death, “the Monument, conceived to be built in a lawn park in Buenos Aires, consists of two high quadrangular ***shell vaults*** elevated over a marble floor, raised from the lawn, and linked by four narrow paths to the surrounding paths of the park.

The essence of the project results from the empty space between the two vaults and the marble surfaces. The vaults do not touch each other: .... the vaults, the paths, the marble surface, the benches, the water, the flower, the plate” (Williams, 1962).

In 1966 Williams adapted and built a similar design for the Bunge and Born’s Exhibition Pavillion at the Argentinean Rural Society Centennial Fair in Palermo, using for the first time the vault shells, but reducing its plan dimension and thickness. “The Pavilion was built creating a virtual space under the vaults where a structure of great unit for exposition was built without columns or beams; as a result, everything that was form was at the same time structure” (Williams, 1966). Even though it was built almost entirely in reinforced concrete, after only two months of exhibition (obtaining barely a Third Prize from the jury) and despite Williams’ efforts to avoid it, the pavilion was demolished becoming later a fundamental piece of modern and avant-garde Argentinean architecture.

https://wikivisually.com/wiki/Amancio_Williams
He was invited to display his ideas on acoustics at La Sorbonne, and the Dean of the Harvard Graduate School of Design, Walter Gropius, organized exhibits of his works in 1951 and 1955, on which latter occasion Williams was a guest lecturer. During the 1950s, he developed designs based on what he called hollow vaults, these were concrete pillars that, by their design, could drain rainwater while supporting the building above as stilts. He later employed the concept for the 1966 Bunge y Born exhibit at the La Rural Exposition grounds and in 1968 for the German Embassy, both in Buenos Aires, as well as for a monument to the reconstruction of Berlin.[3]

Latin America in Construction TITLE WALL - MoMA Press
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Mar 20, 2015 - Archivo Arquitecto Pedro Ramírez Vázquez. AMANCIO WILLIAMS (Argentine, 1913–1989). Pavilion for Bunge y Born at the Sociedad Rural de Palermo, Buenos Aires. 1966. View of the pavilion, showing shell-vaulted canopies. Photograph unframed: 23 13/16 × 20 1/16" (60.5 × 51 cm). Amancio Williams ...

Couple of options here: 1) shell vaults; 2) hollow vaults; 3) shell-vaulted canopies.

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Note added at 15 mins (2018-03-14 21:44:32 GMT)
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AMANCIO WILLIAMS (Argentine, 1913–1989)
Pavilion for Bunge y Born at the Sociedad Rural de Palermo, Buenos Aires
1966
View of the pavilion, showing shell-vaulted canopies
Photograph
unframed: 23 13/16 × 20 1/16" (60.5 × 51 cm)
Amancio Williams Archive
digital