Double under reamed piles

2020-02-17 01:37

INTRODUCTION Under reamed piles are made by C. B. R. I. ( Central Building Research Institute). They are made of R. C. C. In the bottom portion of the pile, enlarged portion is given which is called under reamed or bulb. If pile has one bulb, it is called single reamed, if the pile has two bulbs then it is called double reamed, and ifCalculate the quantity of concrete for the following. 2 Underreamed cast in situ pile of 300 mm dia. of 10. 00 m length. Calculate the quantity of concrete for the following. 2 Underreamed cast in situ pile of 300 mm dia. of 10. 00 m 2 under reamed pile means there are 2 Nos. of bulbs at particular spacing based on friction of soil. double under reamed piles

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Underreamed pile foundations are bored cast insitu concrete piles with one or more bulbs or underreams. The bulb is formed by enlarging the stem of the pile near the bottom in a double conical shape, as shown in Fig. 20. 30. Conventional piles (a and b), single under reamed pile (c) and double under reamed pile (d) Pile geometries Four different geometries were chosen for the investigation, namely conventional bored cast in situ pile of two different shaft diameter, under reamed pile with a single bulb and under reamed piledouble under reamed piles An underreamed pile is a pile of shallow depth (1 to 6 m) having one bulb a its lower end. If this bulb is taken or provided at a level lower than the critical depth of moisture movement in expansive solis, the foundation will be anchored to the ground and it would not move with the movement (i. e. swelling and shrinkage) of the soil.

Double under reamed piles free

In case of double or multiunderreamed piles, the centre to centre vertical spacing between two bulbs may vary from 1 to 1 times the underreamed diameter (D u). The length of underreamed piles varies from 3 to 8 meter and their centre to centre spacing should normally be not less than 2 times the underreamed diameter. double under reamed piles This is the case for all sorts of soils having 2. 5 m or more depth of famous black cotton soil. For such a soils the geotech engineers have got a solution in the form of a specially designed pile foundation called underreamed pile foundation. In case of double or multiunderreamed piles, the centre to centre vertical spacing between two bulbs may vary from 1 to 1 times the underreamed diameter (D u). The length of underreamed piles varies from 3 to 8 meter and their centre to centre spacing should normally be not less than 2 times the underreamed diameter. The ultimate load bearing capacities of the under reamed piles with angle of under reamed bulbs of 45 0 and zero are almost same. 3. Three or more under reamed bulbs are advantageous only when the spacing ratio (S ) is two or less, and when (S ) is greater than two, multiunder reamed piles do not have specific advantages. 4. The pile having two bulbs is known as double under reamed pile. 2. 12 Net Displacement Net movement of the pile top after the pile has been subjected to a test load and subsequently released. 2. 13 Routine (Check) Tests It is carried out on a working pile with a view to determining displacement corresponding to the allowable load.

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