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Chapter 2

The document discusses different types of foundations including raft, grillage, pile, and pier foundations. A raft foundation extends over the entire footprint of a building to reduce settlement. Grillage foundations use steel beams encased in concrete to transfer heavy loads. Pile foundations are long cylindrical columns that support structures by end bearing or skin friction. Pier foundations are large diameter columns that transfer loads to firm strata below.

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32 views44 pages

Chapter 2

The document discusses different types of foundations including raft, grillage, pile, and pier foundations. A raft foundation extends over the entire footprint of a building to reduce settlement. Grillage foundations use steel beams encased in concrete to transfer heavy loads. Pile foundations are long cylindrical columns that support structures by end bearing or skin friction. Pier foundations are large diameter columns that transfer loads to firm strata below.

Uploaded by

bishesh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Mid –Western University

Central Campus of Engineering


Department of Hydropower
Surkhet, Nepal

Subject: Building
Technology
Chapter-02
Foundations and Excavation Works
Presented By:- Er. Mahesh Sharma
Foundation and its types
Raft foundation

 A raft foundation, also called a


mat foundation, is essentially a continuous
slab resting on the soil that extends over the
entire footprint of the building, thereby
supporting the building and transferring its
weight to the ground.
Uses of Raft (Mat) Foundations

 Low bearing capacity soil, Spread footing cover


about 70% of the structure, use to reduce
settlement
Grillage Foundation

 Grillage Foundation is a type of foundation


often used at the base of a column. It consists
of one, two or more tiers of steel beams
superimposed on a layer of concrete, adjacent
tiers being placed at right angles to each other,
while all tiers are encased in concrete.
It is the most economical foundation in case of
transferring heavy loads from columns to soil of
low bearing capacity.
Grillage Foundation
Pile foundation

 Pile foundation , a kind of deep foundation,


is actually a slender column or long cylinder
made of materials such as concrete or steel
which are used to support the structure and
transfer the load at desired depth either by end
bearing or skin friction.
Pier Foundation

 A pier foundation is a collection of


large diameter cylindrical columns to
support the superstructure and transfer
large super-imposed loads to the firm
strata below. It stood several feet above
the ground. It is also known as
“post foundation”.

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