Narrow strip or Deep strip footing
This type foundation is used for normal soil and normal loads which just need 0.9m dept cheep in cost construction.
The essential feature of the narrow strip foundation is that the trench is too narrow to be dug by labours working in trench. It depends for its success in the ability of a mechanical excavator, such as a light tractor-mounted back-actor with a narrow bucket to dig the trench, which must be self-support until it can be backfill with concrete.
It can't be economical be use in very soft clays or water bearing sand which support by close timbering.
From Lewis Telfer
Strip foundations are used to support a line of loads, either due to a load-bearing wall, or if a line of columns need supporting where column positions are so close that individual pad foundation would be inappropriate.
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A shallow foundation is generally considered any foundation element that is 6 feet or less in depth. or the depth of foundation is equals to its width of the foundation. Examples are thickened edge slabs and grade beams that are supporting minimal weight.
A stepped strip foundation is often used on a sloping site where the steps allow the foundation to follow the slope without too much excavation, when compared with excavations and retaining walls. A floor structure that spans between perimeter strip foundations , whether over intermediate piles or not, also minimises excavation, when compared with a slab on grade or slab on fill floor.
The raft will help to avoid any settlement that would occur to strip the foundation. The mat is just placed there to avoid slipping.
strip foundation is love
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Normal Strip, Deep Strip, and Wide strip Advantages it is far more common farmiliar technology it doesnt require specialised plant It is Cheap no need for form work reduce bricklaying below ground level fast allows increase bearing on low strength soils avoids excessive depth of foundation as width increases
The advantages are that many workers know how to use it and it is cheap. Disadvantages are that it is really difficult to fix up any mistakes.
A strip foundation is best known as the lowest part of your structure. The strip foundation is the first piece of supporting layer that is used with a foundation.
There are several advantages to strip foundation. They include being a proven method that the majority of builders know how to use it is easy for keeping the bricklayer occupied, it is fairly cheap, mistakes are too pricy to rectify after concrete has been poured, and services usually do not need immediate attention since they usually cross over the concrete.
The difference between a shallow and deep foundation is very simple. A shallow foundation is not very deep and a deep foundation is.
This is a continuous strip of concrete which support load bearing walls which sit on the centre of the foundation.
disvantages of a narrow strip foundation
Strip foundations are used to support a line of loads, either due to a load-bearing wall, or if a line of columns need supporting where column positions are so close that individual pad foundation would be inappropriate.
Narrow strip or Deep strip footingThis type foundation is used for normal soil and normal loads which just need 0.9m dept cheep in cost construction.The essential feature of the narrow strip foundation is that the trench is too narrow to be dug by labours working in trench. It depends for its success in the ability of a mechanical excavator, such as a light tractor-mounted back-actor with a narrow bucket to dig the trench, which must be self-support until it can be backfill with concrete.It can't be economical be use in very soft clays or water bearing sand which support by close timbering.From Lewis Telfer
THREE DIMENSIONAL DRAWING OF STRIP FOUNDATIONS