So this is a Culture's Orbital Hub, the central part of an orbital (or ring world).
This Hub is made of four parts: A core, the mind nest (minds are very very advanced AI). A ring, that I understand as a kind of relay for the force fields that keep the orbital in motion. And two "poles" that host some over field devices and provide support for the many drones involved in the construction process.
This is a part of my Culture series. you can read about it here:
Part one: https://sebastiengarnier.net/en/project/banks-culture-vehicles-design/
Part two: https://sebastiengarnier.net/en/project/iain-banks-culture-orbital-design/
Part three: https://sebastiengarnier.net/en/project/visual-researchs-culture-design/