Bore Pile Construction Data
PILE SIZE (CM.) |
CROSS SECTION
AREA(CM^2) |
PERIMETER
(CM.) |
DEPTH
(M.) |
SAFE LOAD
(TON) |
DIA.35 |
962 |
110 |
18-23. |
30-40 |
DIA.40 |
1452 |
135 |
18-23. |
40-50 |
DIA.50 |
1964 |
157 |
18-23. |
50-80 |
DIA.60 |
2827 |
188 |
18-23. |
60-90 |
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Dry Process
Bore Pile system by using a Tripod Rig based upon forming the bore by means of a percussion tool which will penetrate obstructions is presently deemed as one of the well known ways of forming bored piles in dry process and has been continuously used up till now.
Requirement:
I. Compressive Strength of Concrete for 28 days is 240 ksc(Cyln) : Minimum Cement content is 280 kg/m3
II. The minimum of distance between existing wall and the centre of bored piles is 60-80 cm.
Standard and Working Procedure
1) Bored Pile system is cast-in-situ process by boring the ground to be hole by using steel casings, screwed together in sections. These steel lining tubes are used to support unstable ground and exclude water from the bore. Where the bore has penetrated into clay it is often unnecessary to use lining tubes and the bore is advanced 'open hole'.
2) On reaching the depth necessary to develop the required bearing capacity of the pile, a stell reinforcement cage is placed centrally in the pile.
3) Self-Compacting concrete of high workability is then poured and at the same time the stell lining is steadily withdrawn.
4) The method ensures that all weaknesses in the stratum are adequately filled with concrete and cover to the steel reinforcement is maintained.
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