What is double under reamed pile?
Double or multiple bulbs under reamed pile: In this type of pile foundation, two or more bulbs are present in the pile stem. The soil trapped between the bulbs acts as a part of the pile increasing the effective thickness of the pile.
What is meant by single under reamed pile?
A pile having one bulb is called single under reamed pile. In its closed position, the under reamer fits inside the straight section of a pile shaft and can be expanded at the base of the pile to produce the enlarged base.
What is under reamed?
Definition of Under-Reamed Pile A cast-in-situ concrete pile with an enlarged bulb at bottom made by either cutting or scooping out soil or by any other suitable process is called Under-Reamed Pile. Under-Reamed Piles are also called bored cast-in-situ concrete piles.
For which depth of foundation under reamed pile is used?
M-15 or M-20 concrete with respective minimum cement content of 350 or 400 kg/m3 may be used. ADVERTISEMENTS: 2. The minimum length of under-ream piles, in deep deposits of expansive soils, should be 3.5 m below the ground level.
What is cast in-situ pile?
Driven cast in-situ (DCIS) piles are constructed by driving a closed-ended hollow steel or concrete casing into the ground and then filling it with concrete.
What is friction pile?
Friction piles are a type of underground piling system used to create a strong foundation for large, heavy structures such as stadiums, bridges and roads that could not otherwise be supported by the topsoil.
What is cast in situ pile?
What is bucket length in under reamed pile?
Contexts in source publication In the models applied in this research all stem diameters are 0.5 m, maximum depth of piles are 6.2 m, single under-reamed bulb is located at the end of the pile stem and the maximum diameter of bulb is 1.4 m, the bucket length is 0.7 m. …
Why under reamed piles are used?
Provision of under reamed bulbs has the advantage of increasing the bearing and uplift capacities. It also provides better anchorage at greater depths. These piles are efficiently used in machine foundations, over bridges, electrical transmission tower foundation sand water tanks.
What is Bucket length of under reamed pile?
In the models applied in this research all stem diameters are 0.5 m, maximum depth of piles are 6.2 m, single under-reamed bulb is located at the end of the pile stem and the maximum diameter of bulb is 1.4 m, the bucket length is 0.7 m. …
Which instrument is used in construction of under reamed pile foundation?
The hole or bore for under reamed pile is done by using a spiral auger.
What is Raymond pile?
Raymond Pile: A pile made by driving a thin steel shell into the ground with a tapered mandrel and filling it with concrete.
What is cohesion pile?
Cohesion Piles process of driving the pile into the ground, the soil becomes moulded and, as a result loses some of its strength. Therefore the pile is not able to transfer the exact amount of load which it is intended to immediately after it has been driven.
What is a floating pile?
Floating piles are uniform diameter slender columns; however, under reamed piles are columns with one or more bulbs at specified locations along their depths that are typically constructed using reinforced concrete.
What is caisson pile?
Bored Piles, also known as drilled shafts, cast-in-place piles or caissons, are constructed by drilling and excavating a slender, cylindrical hole and backfilling it with reinforcing steel and concrete.
What is the application of Underreamed pile?
Uses of Under-Reamed Piles Under-Reamed Piles are commonly used during various soil types, including such sandy soils, clay soils as well as expansive soils. Under-Reamed Piles are supposed to be taken to that depth due to the following factors.
What is the meaning of Under reamed pile?
Definition of Under-Reamed Pile Under reamed piles are bored cast-in-situ concrete piles having one or more number of bulbs formed by enlarging the pile stem. These piles are best suited in soils where considerable ground movements occur due to seasonal variations, filled-up grounds, or in soft soil strata. Uses of Under-Reamed Piles
What is the difference between Under reamed and bearing piles?
Under-Reamed Piles are often referred to as bored cast-in-situ concrete piles. A pile built mostly in the field to transfer the load of the foundation to the soil by resistance produced as in its tip along the top, or even both, is referred to as bearing piles.
What are the different types of Under reamed piles?
Depending upon the number of such bulging bulbs present, under reamed piles can be classified as single, double, and multi under reamed piles. The load-bearing capacity increases as the number of bulbs increased.
Which machine is used for the installment of Under reamed pile?
The machine used for the installment of under reamed pile is lightweight and two of its important parts are A spiral auger is a device used in construction works. It consists of a sharp twisting blade and is used for boring purposes.