Foundations in Low-Rise Construction (up to 3 floors)

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Presentation transcript:

Foundations in Low-Rise Construction (up to 3 floors) The function of a foundation A foundation is designed and constructed to safely transmit the loads of the building to the ground or sub-soil. They should be able to support the loads of the building for its lifespan and allow for some settling of the building. The kind of foundation used depends on: The load Type of structure Site requirements The type of soil.

The foundations of a building are the lowest level of the building and are usually below the ground. They support the load of the building above by spreading the pressure over a large area. The soil on which a building is constructed can take some of this load. Spreading the load through the foundations uses the soil strength and means you do not have to spend extra money on more materials.

Strip Foundations Steel rebar provides stability for the concrete, holding it together and preventing it from breaking apart as the building settles. Strip foundations – these are shaped like a strip. These are the most common types used in low-rise construction like the construction of a house. These are designed to support the loads of continuous walls and transmit it to the ground.

Deep Strip Foundations Very similar to strip foundations but more concrete is used in the foundation rather than building in the foundation itself.

Raft Foudations Raft foundations – these take the load from the whole building and transfer it to the ground. These are more expensive than strip or pad foundations. These are used when soil conditions are poor or variable.

Short Bored Pile Foundations https://www.youtube.com/watch?v=pktM__i-8IQ&safe=active video Pile foundations – these are constructed when soil is very weak to support the load. Through piles, load is transferred deeper into the ground to a stronger base.

Pad Foundations pad foundations – these support loads from columns and piers and transmit these loads to the ground. This sort of foundation is like a concrete pad or slab supporting a column, normally in the middle of the pad.

1. Explain the function of a foundation 1. Explain the function of a foundation. Include the keywords (loads, subsoil, settling). 2. Name 5 types of foundation. 3. What sort of soil may need a short bored pile foundation? 4. How do Pile foundations work?