Burj Khalifa

Burj Khalifa's Foundations

194 bored piles on a raft foundation thickness 3.7 m  each pile diameter 1.5 m, depth of piles 45-50 m depth. Determination Burj Dubai - khalifaThe Tower foundations consist of a pile-supported raft. The solid reinforced concrete raft is 3.7 meters (12 ft) thick and was poured utilizing C50 (cube strength) self-consolidating concrete (SCC). The raft was constructed in four (4) separate pours (three wings and the center core). Each raft pour occurred over at least a 24 hour period. Reinforcement was typically at 300mm spacing in the raft, and arranged such that every 10lh bar in each direction was omitted, resulting in a series of "pour enhancement strips" throughout the raft at which 600 mm x 600 mm openings at regular intervals facilitated access and concrete placement.

The Burj Tower raft is supported by 194 bored cast-in-place piles. The piles are 1.5 meters in diameter and approximately 43 meters long with a design capacity of 3,000 tonnes each. The Tower pile load test supported over 6,000 tonnes The C60 (cube strength) SCC concrete was placed by the tremie method utilizing polymer slurry. The friction piles are supported in the naturally cemented calcisiltite conglomeritic calcisiltite formations developing an ultimate pile skin friction of 250 to 350 kPa (2.6 to 3.6 tons/ft). When the rebar cage was placed in the piles, special attention was paid to orient the rebar cage such that the raft bottom rebar could be threaded through the numerous pile rebar cages without interruption, which greatly simplified the raft construction.

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