Caisson foundation

Civil Diary Online

A caisson foundation is a type of deep foundation that is used for large structures like bridges, skyscrapers, and other heavy structures. It is a cylindrical structure that is drilled or dug into the ground, then filled with concrete or steel reinforcing bars.

The process of installing a caisson foundation involves the following steps:

  1. Site Preparation: The area where the caisson is to be installed is cleared and leveled.

  2. Excavation: A hole is drilled or dug into the ground using a large drill or a mechanical auger.

  3. Reinforcement: Steel reinforcing bars, also called rebar, are inserted into the hole to strengthen the structure and provide support.

  4. Filling: The caisson is filled with concrete, which is poured from the top of the structure down to the bottom, displacing any water or soil that may be present.

  5. Capping: Once the concrete has set, a cap is installed on top of the caisson to support the structure that will be built on top.

There are two types of caissons: drilled and driven. Drilled caissons are made by drilling a hole into the ground and filling it with concrete. Driven caissons are made by driving a hollow steel cylinder into the ground using a large hammer, then filling the cylinder with concrete. Driven caissons are typically used in areas with hard soil or rock, while drilled caissons are used in softer soil.

Caisson foundations are preferred over other types of foundations for large structures because they can provide a high load-bearing capacity, even in areas with

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