RCD rigs
Reverse Circulation Drilling rigs
Reverse Circulation Drilling rigs(RCD) can be used for large variety of construction works.
RCD with drilling string is installed on the top of casing first.
The plenty of water and compressed air are supplied into the casing during RCD's drilling.
The cutted rocks lift up with water and air through the drill pipe
and it also referred to as airlifting system.
RCD method provide the best performance in :
- Mixed soil layer, inclined rock and hard rock
- Large diameter from 0.8m to 5m (2.6ft to 16.4ft)
- Super deep foundation up to 200m
- Inclined drilling for anchor pipe
RCD Applications at everywhere
-
Bridges -
Commercial building -
Sea terminal, Jetties -
Oil & Gas platforms -
Wind farms -
Dam rehabilitations -
Elevated metro stations -
Ventilation Shafts(ex. Metro)
- Mixed soil layer, inclined rock and hard rock
- Large diameter from 0.8m to 5m (2.6ft to 16.4ft)
- Super deep foundation up to 200m
- Inclined drilling for anchor pile
RCD Arrangment
RCD specfication
| Model | PTD150 | PTD200 | PTD250 | PTD300 | PTD350 |
|---|---|---|---|---|---|
| Max. Casing dia.(mm) | 1,500 | 2,000 | 2,500 | 3,000 | 3,500 |
| Max. Power swivel torque (kN.m) | 180 | 180 | 300 | 300 | 484 |
| Max. Drilling speed (rpm) | 26 | 26 | 26 | 20 | 19 |
| Max. Thrust force Up (kN) | 945 | 1,100 | 1,400 | 1,840 | 2,218 |
| Max. Thrust force Down (kN) | 645 | 680 | 820 | 1,130 | 1,463 |
| Stroke of Thrust cylinder (mm) | 3,500 | 3,500 | 3,500 | 3,500 | 3,500 |
| Normal size of drill rod pipe (NW) | 200 | 200/300 | 300 | 300 | 300 |
| Jib crane winch capacity (kN) | 10 | 10 | 10 | 10 | 10 |
| Unit weight of drilling rig (tons) | 17 | 22 | 31 | 36 | 55 |
| Unit weight of clamp (tons) | 3.5 | 4.2 | 5.1 | 8.1 | 10 |
| Hydraulic power pack (kW/ Hp) | 210 / 280 | 210 / 280 | 450 / 610 | 450 / 610 | 450 / 610 |
Power pack
| Model | SHP280 | SHP380 | SHP610 | SHP800 |
|---|---|---|---|---|
| Engine output | 210kw / 280HP | 285kw / 380HP | 450kw / 610HP | 585kw / 800HP |
| Normal rpm | 1800rpm | 1800rpm | 1800rpm | 1800rpm |
| Hydraulic pump | 201L/min x 2set | 324L/min x 2set | 360L/min x 2set | 504L/min x 2set |
| Max pressure(bar) | 320 | 320 | 320 | 320 |
| Dimension (WxLxH / mm) | 1900x4000x2300 | 2000x5500x2500 | 2100x6000x2600 | 2300x6500x3200 |
| Weight (ton) | 7.5 | 9.0 | 11.0 | 15.0 |
Drill string
Basic drill string
Basic drill string consists of the drill rod pile and stabilizer.
This string is the extension part that connect RCD swivel required length after rigid string.
One stabilizer is needed on every three drill rod pile.
Rigid drill string
Rigid drill string consists of the heavy pipe, drum stabilizer and drill bit.
These strings aim to sustains RCD torque and keep verticality.
A Rigid drill string is about 15~17m when they are all connected.
Stabilizer & Drill bit
Stabilizer
- Suction hole
- Air pipe
- Stabilizer guide
- Stabilizer bushing (rotating)
Drill rod pile stabilizer is installed in the middle of drilling string to prevent the pipe bending.
A stabilizer with guide works to keep verticality as well.
Drill bit
- Suction hole
- Roller cutter
- Saddle
- Drill bit body
The drilling bit is equipped with roller cutters rotating at the end of the drilling string to cut off rock.
It's special designed configuration of the roller cutters efficiently drains slurries very well.
Strong point
-
Minimizing crack Unlike a hammer, a RCD drills and cuts the rock layer smoothly with no crack.
-
Saving cost RCD machine is the best solution and economical method for rock socketing
-
Eco-friendly method RCD is low noise so there is little impact on the sea world and environment-friendly
-
Racker pile Racker pile is available if the project requires it, like anchor pile and sea port