 Borkovský carried out excavations on an early Slavic burial ground in Loreto Square in front of Prague's Czernin Palace in 1934–35.He also led the excavation of a medieval burial ground in Bartolomejska Street in 1936, ahead of the construction of a new police headquarters.Between 1932 and 1936 he also managed the cataloging of the archaeology collection of the Josef Antonín Jíra Museum.