This project was developed in consultation with the management of MPI (the association of companies Metrostav, Průmstav and Imos), which was responsible for the complete modern reconstruction of the NM.

Our company has already designed 2 cantilever staircases and 2 glass suspended landings in the eastern hall of the NM for MPI. After the successful installation of the glass platforms, we were approached by the management of MPI with a request to possibly install a glass floor in the NM dome.

After visiting the dome and gleaning all available information, Michal and I calculated and prepared a proposal for a technical solution. Our proposal was approved and so we could get to work. MPI did not give us much time, however, as a date was already set for the approval and opening of the dome. We received the project only during the construction phase.

• The steel structure under the glass floor is pre-tensioned and temperature differences cause height variations of approximately ±2 cm.
  We had to design the fixing system for the glass floor in such a way that we could compensate for these fluctuations.
• The glass floor is laid on height-adjustable round stainless steel discs, which can be used for this height adjustment.
• Another unique feature of this floor is that the glass is not drilled into these height-adjustable discs. Of fundamental importance here is the special PVC (here we have an industrial sample of this element), which keeps the glass from shearing more than 3.5 times the ČSN standard.
  By this method of fixing, we were able to adjust the glass floor in height to compensate for the unevenness of the steel structure underneath, and we also achieved an absolutely precise alignment of the joints between the glass panes by not drilling into the glass itself.
• The glass panes have been calculated and tested by us in the testing lab of the Czech Technical University in Prague for both shear and for bending and breaking. They are composed of 4 x 10 mm ESG/TVG glasses. These panes will only crack when bearing point loads of over 5 tonnes!
• The panes also have an anti-slip grid fused on the top plate, which prevents slipping according to the ČSN standard.

This glass floor is technologically unique thanks to its fixing and design and is undoubtedly the jewel in the crown that is the dome of the National Museum.