In this video i have covered the topic of under reamed pile foundation. This pile type special feature is an enlarged portion are given at bottom or at midpoint which is known as under reamed or bulb. The centre to centre spacing for under reamed piles should not be less than the 2 times diameter of the pile. Code of practice for design and construction of pile foundations, part 3. If pile has one bulb, it is called single reamed, if the pile has two bulbs then it is called double reamed, and if.
Subsequently the portion pertaining to under reamed pile foundations was deleted and now covered in is 2911 part 3. Under reamed pile foundations are bored cast insitu concrete piles with one or more bulbs or under reams. After watching the video you will get to know all the terms and the value mentioned in the drawing. Influence of under reamed pile groups arrangement on tensile bearing capacity using fe method. Underreamed pile foundation have mechanically formed enlarged bases called bulbs which are one or more in nos at its lower ends and can be as much as 6 m in diameter and can be at a shallow depth of range 1 to 6 m depending on the critical depth of soil characteristics with that of moisture movement. Retaining walls are structures that help in maintaining the surface of the ground at different elevations on either side of the structure. In the bottom portion of the pile, enlarged portion is given which is called under reamed or bulb. The cost advantages of under reamed piles are due to the reduced pile shaft diameter, resulting in less concrete needed to replace the excavated material. What are the advantages and disadvantages of under reamed.
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