bored pile
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Bored Pile Procedure
Content
Bored Pile Procedure : 1. Set up the Location of Bored Pile
2. Insert Casing
3. Drilling
4. Removing Slime
5. KODEN-Test
6. Insert of Steel Cage
7. Insert Tremie Pipe
8. Pouring the Concrete
9. Removing Casing
Cycle Time of a Bored Pile
Bored Pile Procedure
1. Set up the location of Bored Pile
Bored Pile Procedure
We use Total Station instrument to survey each pile point.
Bored Pile Procedure
2. Insert casing casing must be stand vertical ( by checking verticality of casing when insert casing )
Bored Pile Procedure
use Vibrodriver or Vibrohamer to insert casing
Bored Pile Procedure
3. Drilling Drilling Machine : weight : 130tons BG - 40 drilling depth :
49m diameter : 3m
weight : 96tons BG - 28 drilling depth :
39m diameter : 2.5m
weight : 91tons SD - 515 drilling depth :
36m diameter : 2.5m
BG - 40
BG - 28
SD - 515
Bored Pile Procedure
4. Removing slimewhen finish drilling , we use Mechanical pump equipment to remove slime .
Bored Pile Procedure
5. KODEN TestKODEN test utilizes the principle of ultrasonic wave travel from
sensor to the wall of drilled hole and reflect to the sensor through the bentonite slurry. Equipment
KODEN equipment consists of two parts, recorder unit and winch unit .
Recorder Unit Winch Unit
Bored Pile Procedure
Recorder unit controls the operation and record the test result. On the other hand, winch unit lowers the probe (sensor) down the hole for ultrasonic reflection . Testing Procedure
1. Remove any obstacle around the hole area in order that the test equipment can access to the hole .
2. Place the winch unit over the top of drilled hole or on the steel casing. Position the sensor (probe) at the center of the hole .
3. Lower the sensor into bentonite slurry. Hold the sensor at depth approximately 1 to 1.5m .
4. Restore the sensor to the starting position and perform the test.
Bored Pile Procedure
Test Result Test results are presented in graphical plot and show characteristics below :
1. Profile along two perpendicular axes.
2. Average verticality of the hole.
3. Location or depth where abnormality Occurs such as reduction in diameter,or collapsed wall of the hole.
4. Depth of drilled hole.
Bored Pile Procedure
6. Insert of steel cage
Bored Pile Procedure
7. Insert Tremie
Bored Pile Procedure
Type of tremie pipe :
we have 3 types of tremie : 1m, 2m and 3m Length
3m L
eng
th
1m L
eng
th
2m L
eng
th
Bored Pile Procedure
How to insert tremie pipe :
1. Use mobile crane to hang the hopper 2. Then connect each tremie pipe3. After that put it into the bored pile hole
until bottom
When we pour concrete, we have to burythe tremie pipe into concrete as below :
Diameter of Bored Pile
Buried Length of Tremie
Ø1000 3 to 3.5m
Ø1800 2 to 2.5m
Bored Pile Procedure
8. Pouring the concrete
Quality of Concrete : Max. size of Aggregate : 2.5cm Workability : 55cm ( Flow )
Bored Pile Procedure
Strength of concrete : ► Design strength : fck =300kg/cm² ( 28day’s cure concrete ) ► Strength of mix ( Target Strength ) : according to the Standard
Specifications of Concrete ( Korea Concrete Institute )
Strength of mix ( Target Strength )
So, for Actual Concrete Strength : 400kg/cm²
Material Strength
Calculation of fck ( Mpa )Strength of mix
( Mpa )
Target Strength 21 > fck fck + 7
( Standard specifications of concrete )
21 ≤ fck ≤ 35
fck + 8.5
( Korea Concrete Institute )
fck > 35 fck + 10
fck 300kg/cm² = 29.42 Mpa
Strength of mix
29.42 Mpa + 8.5 Mpa = 37.92 Mpa = 389 kg/cm²
Apply : 400 kg/cm²
Bored Pile Procedure
9. Remove casing
Cycle Time of a Bored Pile
Step of Bored PileCycle time of each
step( hour)
1. Set up location of Bored Pile
0.3
2. Inserting Casing 2
3. Drilling 8
4. Removing slime 1
5. KODEN Test 1
6. Inserting Steel Cage 2
7. Inserting Tremie Pipe 1
8. Pouring the concrete 2
9. Remove casing 1.5
Total Cycle Time 18.8
Thank You for Your Attention!
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