What is contiguous bored pile?
Contiguous piled walls consist of a row of successive unconnected cast-in-situ concrete piles constructed with small gaps between the adjacent piles, formed using CFA or rotary bored piles (replacement piles techniques).
What are the advantages of contiguous piling?
The Top 10 Advantages of choosing a Contiguous Pile Wall are: Easier to build in load variations, with no requirement for a guidewall. It’s a cost-effective bored pile solution, compared to Diaphragm walls. They can be used for more flexible geometry than a diaphragm wall.
Is contiguous piling permanent?
Contiguous piled walls are generally designated as temporary works but in the majority of construction events will be included as part of the basement shell or foundation for the above ground permanent works.
What is CBP in construction?
CONTIGUOUS BORED PILE WALL. This pictorial guide illustrates the construction. sequence of a Contiguous Bored Pile (CBP) wall. This type of retaining wall was used for the. construction of several deep excavation works.
What is secant bored pile?
A secant pile wall is a type of bored pile retaining wall consisting of a system of interlocking reinforced concrete piles. Secant-piled walls can be constructed using either Continuous Flight Auger (CFA) or Bored Cast-in-Place (CIP) methods.
What is the difference between CFA and rotary bored piles?
CFA piles are suitable for lighter loads, whereas bored piles are used for heavy-loaded constructs, to bypass underground impediments, and infiltrate the ground that is too hard to drill with a continuous flight auger.
What is bored pile wall?
Bored pile walls can be chosen as a variant of cast-in-place concrete retaining walls. They represent low-deformation retaining walls which are capable of transferring large vertical loads into the ground, but also of supporting large horizontal loads due to their high flexural stiffness.
What is bored pile retaining wall?
A bored pile wall transfers the load to the layers of surrounding soil or rock that have sufficient bearing capacity in order to provide support to a structure. The removal of spoil forms a hole for a reinforced concrete pile which is then poured in situ, often using the CFA piling technique.
Are diaphragm walls waterproof?
Diaphragm walls and contiguous/secant piled walls are commonly used in the construction of large commercial basements in city centres. Because of the way these types of wall are constructed, it is only possible to position the waterproofing on the internal face of the wall.
Why are CFA piles used?
CFA piles are easy to mount and are often a safe and cost-effective solution for many types of construction. For example, urban developments usually use CFA piling because it prevents vibration, decreasing the noise and disruptions in adjacent buildings.
What is contiguous piling construction?
Contiguous piling is a way of creating a retaining wall by inserting a row of augured piles that almost touch one another. The most common ways of inserting an augured pile are either: to bore a hole with continuous steel sections, which can then be removed and the hole filled with concrete, or.
What is a Combiwall?
Combi-walls are piling walls that are comprised of high modulus structural components interspaced by lighter sheet piles. The high modulus components – known as king piles – can be tubular, box, bearing or other types of fabricated piles.
What are the different types of construction techniques for contiguous bore piles?
There are three most commonly used construction techniques for Contiguous bore piles: Continuous flight auger (CFA) piling is the technique in which piles are drilled and concreted in a single continuous operation hence allowing much quicker installation times than simply bored piles.
What is a contiguous pile?
Contiguous piles are suitable in adjoining properties, these piles restricts ground movements on the backfill side. The pile is formed by first drilling into the ground with a CFA.
What are the different types of bored pile walls?
Shah H.J., Reinforced Concrete Vol.1 (Elementary Reinforced Concrete), Charotar Book House, Anand, Gujarat, India, 2005. There are three different bored pile wall options: contiguous piles, secant piles and tangent piles.
How do you make a bored pile?
Concrete is poured into the borehole to form the bored pile. Wooden pegs are used to mark out the center position of each bored pile. The gap between two bored piles is typically between 100 to 200 millimetres. 01 . Position of Bored Pile