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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.

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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

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Bored Pile Procedure

1. Set up the location of Bored Pile

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Bored Pile Procedure

We use Total Station instrument to survey each pile point.

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2. Insert casing

 casing must be stand vertical

( by checking verticality of casing when insert casing )

Bored Pile Procedure
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Bored Pile Procedure

 use Vibrodriver or Vibrohamer to insert casing

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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

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Bored Pile Procedure

4. Removing slime

when finish drilling , we use Mechanical pump equipment to remove slime .

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Bored Pile Procedure

5. KODEN Test

KODEN 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

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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.

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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.

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Bored Pile Procedure

6. Insert of steel cage

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Bored Pile Procedure

7. Insert Tremie

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Bored Pile Procedure

Type of tremie pipe :

we have 3 types of tremie : 1m, 2m and 3m Length

1m Length

2m Length

3m Length

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Bored Pile Procedure

How to insert tremie pipe :

Use mobile crane to hang the hopper

Then connect each tremie pipe

After that put it into the bored pile hole

until bottom

When we pour concrete, we have to bury

the tremie pipe into concrete as below :

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Bored Pile Procedure

8. Pouring the concrete

Quality of Concrete :

 Max. size of Aggregate : 2.5cm

 Workability : 55cm ( Flow )

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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

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Bored Pile Procedure

9. Remove casing