Pile foundation is necessary when there
isn’t sufficient soil bearing capacity for the structure to be able to
withstand. It is caused by the condition of the soil or operational
conditions, conditions at the site, load types on the foundations or
order of the bottom layers.
There are many different factors that
can prevent a surface foundation being selected as a well-suited
foundation, such as intensity of loads and nature of the soil. We use
piles for building in water such as dams and bridges or where soil has
low bearing capacity.
There are two components that make up a
pile foundation: a group of piles or single pile and the pile cap. The
load from structures are transferred by piles to the soil that has hard
bearing capacity, rocks or hard strata. They are slender and long, with
a length that may exceed 15m.
Piles are made out of steel, wood or
concrete, depending on what the requirements are. The piles are then
jacked, drilled or driven into the ground. They are then connected to
the pile caps. The classification of pile foundations is based on the
piles load transmitting characteristic, type of soil and the material
used in the pile construction.
Pile foundations
have been used as load transferring and load carrying systems for a
number of years. In the early days, they used timber piles. They were
driven into the ground manually or holes were dug and then filled with
stones and sand. Since the 19th century steel piles have been used, and
since the 20th century concrete piles have been used.
With the industrial revolution and
changes in technology, many advanced systems for pile driving have been
developed from diesel and steam pile driving machines being invented.
Pile foundation usage continues to
increase due to the lack of available land for construction.
Multi-storied, heavy buildings are being built, and the loads from the
structures can’t be transferred directly to the ground because of the
issue of low bearing capacity as well as stability issues with the
building when lateral load is being applied. So the demand for pile
foundations continues to increase. This high demand has resulted in
many improvements being made to piles as well as pile driving systems
and technology. There are numerous advanced pile installation
techniques available these days according to UK screw pile foundations provider Ground Sun.
Pile Foundation Function
Like other foundation types, the purpose of a pile foundation is to:
- Transmit the loads of the building to the ground soil layers and foundations whether the loads are inclined or vertical.
- Install cohesion less and loose soil through vibration and displacement.
- Control the settlements. Surface foundations can accompany it.
- Increase the safety factor for heavy load buildings.
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