Re- creation Chahar-taqy and its surrounding corridors form of Azar-Goshnab (Takht-I Suleiman) fire temple

Chahar-taqy of Takht-i Suleiman fire temple is one of the important Sassanid constructions in Azerbaijan which deteriorated in later periods (especially after Ilkhanid period 1300 AD) because of desolateness and lack of attention, and now the only remaining of this historic monument are dome bases and signs of the ruined Ribs between four dome piers. The main objective of this paper is to re-reading the main form of Chahar-taqy through field studies, analysis of historic documents, comparative studies and exploring evolutionary trend of the work regarding similar cases and also considering technology and philosophical and practical basis of construction period in order to use it in protective coverage design to prevent from the threat of corrosive factors and gradual destruction of the building and create a clear image of its basic form for the visitors. Although the result of this study could be use in variety restoration and conservation project against gradual degradation. So to reach this aim, the originally form re-create by using remaining evidence, historical documents and comparative studies, and finally according the originally form, a protective design prepare in adaptation and harmony with historical construction. The study demonstrates that Takht-i Suleiman Chahar-taqy form was like all Sassanid Chahar-taqy, and its dome form was just like other Sassanid domes constructed by primary pendentives and is in oval shape, but in some situation it followed particular archetype.