Ancient Dezful city is located in the SW of Iran (5000BC-2016AC) near Dez River. This spiral domes are used to demonstrate the symbolic special constructions which is similar to the construction of Denial’s holy shrine, the Jewish messenger (500BC), the Lion King Yaghob Saffari’s tomb (800AD) and the Rood-band Syd’s burial place (1409AD). These structures are made by simple local materials. The common materials used are bricks and Sarooj mixture. Sarooj is the main mortar, a man-made concrete. After thousands of years, it still stands all kinds of tension, pressure, wind, rain, conflicts and wars, weapons and rockets effects (1980-1988), and sewage exposure. All bricks were set to demonstrate the cubic elements around the spiral curve. It turns around circles with variable radiuses on the spiral path- line which makes a conic parabolic sharp dome. Two domes constructed in each parabolic dome. The first dome is fixed between the supports that are called the inner dome. It was erected on the semi sphere space. The second dome is constructed by the parabolic conic section to demonstrate a beautiful, cultural and architectural masterpiece of engineering. The Main materials are bricks, dolomite, canes, stone blocks and Sarooj, a special mortar. The height of the Spiral Parabolic Dome (SPD) is about 10m and the radius of the inner dome is measured about 2 m with a ratio of 2.5 that would vary with the Geo-technical conditions and the architectural considerations.
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