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 BG - 40 BG - 28 BG - 28 SD - 515 weight : 96tons drilling depth : 39m diameter : 2.5m weight : 91tons SD - 515 drilling depth : 36m diameter : 2.5m Bored Pile Procedure 4. Removing slime when finish drilling , we use Mechanical pump equipment to remove slime . 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 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 : 2m Length 1m Length 3m Length we have 3 types of tremie : 1m, 2m and 3m Length Bored Pile Procedure How to insert tremie pipe : 1. 2. 3. 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 : 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 ) 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 Strength of mix ( Target Strength ) 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 Pile 1. Set up location of Bored Pile Cycle time of each step ( hour) 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 Total Cycle Time 1.5 18.8 Thank You for Your Attention!