Construction foundations can be classified as shallow or deep foundations, and both have their benefits. Such foundations are the units that support a building, bridge, fence, wall, etc., and these can be made out of different materials like wood, concrete, or stone and measure between 0.5 – 2 meters in height.
Deep foundations are more stable means of supporting heavier weight types of structures, i.e., deep foundations are used where the loads imposed design are moderate or heavy compared to the level of bearing capacity that the surface soil has. On the other hand, the general rule for determining when to install a shallow foundation is the yield strength of the underlying materials. You may find shallow foundations to be typically associated with buildings between two and three stories tall. Deep foundations generally are associated with buildings four or five stories tall, provided they are built on solid rock or clayey soils.
The most common type of foundation work is piling or pile foundations. These pile foundations are generally used for shifting the super structure loads onto other supporting structures made of earth, timber, concrete or even stone.
Building piles should be carefully considered, as pile foundations carry a lot of loads (think about the weight of your house). That load is being transferred from one solid material (like dirt or bedrock) to another. It requires an engineer to understand precisely how the material will behave under these conditions, making sure the piling is not overloaded, its tensile strength, and how securely it will hold up under load. Basic understanding of foundations and how piling helps with foundation work, let us tell you about is the most common types of pile foundations, i.e. Bored Pile Foundations or Contiguous Bored Pile.
Bored Pile foundations are one of the most common types of foundations styles used during the construction process. These bored pile foundations are also known as replacement piles. They are typically used for foundational structures for buildings that act as support structures, thereby transferring the load to a lower layer of bedrock or soil with sturdy, load-bearing capability. Bored Pile Foundations are typically created by removing spoil, thereby forming a cavity in the ground, where the reinforced concrete pile is poured in situ.
The replacement pile or bored pile then replaces the removed spoil, thus creating the bored pile foundation. The Bored Pile Foundations technique is used typically in cohesive subsoils to form friction piles and once pile foundations have been built near pre-existing constructions. The bored pile foundation system is generally found in urban zones where vibrations are at the lowest with limited headroom and lowest heaving risk. This type of piling system can also be helpful if the variation is needed in the piling length during construction.
Another form of bored pile foundation is known as contiguous bored pile walls. These comprise a series of consecutive disconnected cast-in-situ concrete piles made of short gaps separating the adjacent piling. A contiguous bored pile is usually built with rotary bored piles or CFA, also known as the replacement piling method. Compared with other piling systems for supporting soil, Contiguous bored pile walls tend to be more straightforward with better economic support because of cost-efficiency and better and lesser construction period, especially when lower level to mid-level excavation depth is concerned.