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A 24-inch (610 mm) layer of concrete mixture and 6-inch (150 mm) layer of Portland cement mortar was deposited atop each caisson, supporting the piers above. The piers were made of concrete mixture deposited in detachable forms. [25] The piers were built in two sections, separated by horizontal "collars" that surrounded them. [28]
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
Franki piles can be used as high-capacity deep foundation elements without the necessity of excavation or dewatering. [4] They are useful in conditions where a sufficient bearing soil can only be reached deeper in the ground, [5] [6] and are best suited to granular soil where bearing is primarily achieved from the densification of the soil around the base. [4]
A deep foundation is a type of foundation that transfers building loads to the earth farther down from the surface than a shallow foundation does to a subsurface layer or a range of depths. A pile or piling is a vertical structural element of a deep foundation, driven or drilled deep into the ground at the building site .
Reinforced concrete forms the crib, within which is a basement 69 feet (21 m) on a side. The basement is divided into two sections: one for machinery and one for the crew's sleeping quarters. The basement originally had 27 porthole-style windows 24 inches (610 mm) in diameter, but all windows in the structure were sealed after the light was ...
Additional concrete forms an external "wave flare" around the pier, and the resulting pier structure is approximately 25 feet (7.6 m) high from its base. [7] The lighthouse itself is a 25 feet (7.6 m) square, white, three-story structure made of a skeletal steel frame covered with reinforced concrete and iron [ 4 ] and sheathed with steel. [ 7 ]
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A pile cap is a thick concrete mat that rests on concrete or timber piles that have been driven into soft or unstable ground to provide a suitable stable foundation. It usually forms part of the deep foundation of a building, typically a multi-story building, structure or support base for heavy equipment, or of a bridge.
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