On-site drilling piles

1. Method overview

The reverse circulation drill method is a method in which a special roller bit is installed at the end of the drill rod to crush the rock by rotating it 360 degrees, and the crushed excavated soil is discharged through the drill rod pipe, and the discharged circulating water is circulated back into the excavation hole through the sedimentation tank.

2. Method characteristics

1) It is advantageous for deep pile construction, and casing is inserted up to the soil layer and the rock layer is constructed with a bit.

2) It is used for bridge foundations, large building foundations, and overpass foundations, and is constructed in parallel with the top-down method. 3) A method to cope with the demand for large bearing capacity due to the trend of larger structures

4) Suitable for urban construction with low vibration and low noise

5) Construction possible up to 1,000mm to 3,000mm casing diameter by only replacing some parts (cramps, stabilizer eyes, drill bits)

6) Excellent durability due to special drill bit installation.

3. Construction method and order

1) Installation of forced dry sand laying device

2) Installation of sand transport drainage pipe

3) Operation of air injection and drainage motor

4) 1st laying (laying thickness that can be entered by personnel)

5) Extension or reduction of drainage pipe

6) 2nd laying (laying thickness that can be entered by wetland guides and clamshells)

7) Equipment movement and continuous execution of 1) to 6) work