Sun. Nov 28th, 2021

There are different types of foundation available and each one is unique to the soil on which it would be built. Let’s take a look at some foundations and how they are built.

Traditional or orthodox strip

This is the oldest and most common form of foundation. The construction method is, the trench is dug, concrete is placed on the bottom and the wall is built over it. The width is governed by the relationship between the imposed loads and the load-bearing capacity of the soil; and by the practical need of the operator to work in the trench.

Broadband foundations

This base is used where the bearing capacity of the soil is low. For example in: swampy terrain, soft clay silt, and groomed terrain.

The bases of the weft strip are:

o A variation of the traditional strip

o Distributes the load over a larger area of ​​floor

o It is customary to provide transverse and longitudinal reinforcements to withstand the stresses that will arise from the load of the building.

o Depth below ground can be the same as for traditional or orthodox strip foundation

Inverted ‘T’ beam

This is one of the best; you don’t have to worry about the ground.

o It is an alternative to the wide strip base

o It is a wide strip base form with a vertical beam

o It has both transverse and longitudinal reinforcement

o This type of foundation is used in expansive clay soils.

Deep strip or trench backfill base

o A variation of the traditional strip

o First introduced to reduce the expense of traditional band foundation construction at depths of nine hundred millimeters or more in retractable soils and to counteract varying soil conditions.

This type of foundation can be inexpensive. Why?

o When excavating by machine, the volume of earth excavated is reduced

o The trench is reduced

o Backfill and excess soil are also reduced

o Time is also saved due to faster completion

o Reinforcement if necessary

Stepped foundation

The foundation should be horizontal unless, of course, they are required to withstand the inclined thrust of the walls or some arched shapes. Laying strip foundations on a sloped site at the same level will mean deep trenches for those on a higher level as they will be at a good depth below grade, requiring excessive wall in the ground.

Excess accumulation in the soil can be reduced by:

I. Cut alone

ii. Fill only

iii. Cut and fill, to provide a horizontal plane to build or stagger the foundation of the wall down the slope, parallel to the slope. These are called stepped foundations.

Insulated column foundations (also called pad base)

The insulated column foundation is a free-standing square or rectangular concrete slab with a column or column support in the center of it. It is generally used to support framed structures on even, firm and stable floors.

Continuous column foundation

The continuous column base is a concrete strip that carries a line of columns. Such a base can be used because when:

1. The spacing in one direction and the loading of the columns are such that the edges of the adjacent individual platforms touch or overlap.

2. The extension of the foundation at right angles to the column line is restricted, for example, by the construction of the site boundary and therefore avoids independent platforms of adequate size.

Combined column foundations

Adjacent column foundations are combined when:

1. A column is near the boundary of the site where a separate base would be eccentrically loaded and

2. When the foundations of adjacent columns are linked to resist lifting, overturning or opposition forces.

Because the base of the column adjacent to the site boundary cannot spread uniformly around the column, it combines with the base of an adjacent column to form a combined or balanced base base.

By admin

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