Using Concrete Caissons as a Foundation for Double- Circuit 230 KV Transmission Line, Qeshm Island, Iran

In the past 50 years, there have been many attempts to design and construct a way fortransferring energy, water, etc. to Qeshm Island. The most suitable location for this purpose isnear Qeshm Strait, located between Bandar-e-Pohl and Bandar-e- Laft , which is about2200 meters long. Various methods have been considered for transmitting power to theQeshm Island through a Double- Circuit 230 KV Transmission Line, including: constructing abasement in the seabed at depth of 20m using concrete imbedded piles or floating concretefoundations; constructing two high columns in both sides of the strait and using underseacables. Although these methods were possible, they were not economically feasible.Therefore, floating concrete caissons were preferred. Because the lateral forces arising fromwater flow and wind can twist and rotate the foundation, it is very dangerous to use tensionconcrete piles in the sand layer. So, concrete caissons (Dimensions: 32*32m, Height: 8m)were selected to maintain concrete basements (Diameter: 5m; Height: 18m). Since it is notpossible to construct this caisson in the site, they should be constructed in a proper place incoastal area and be floated in the sea, transported to the installation site, drowned, and then beinstalled in the seabed. This paper considers imposing forces to a caisson including waterflow, rotation and torsional moments and their effects on stability of the structure.

کلیدواژه ها:

Floating Basement ، Caisson ، Concrete Piles ، Qeshm Island