DISAVANTAGES OF PRE-BORED SYSTEM Slow productivity. High Risk for Pile ECC problem. Bored-Hole may collapse -Double Handling of
Work. Involve 2 different type of machinery-Cost Issue Not environmental friendly construction method
– The underneath soil and sand which is not necessary also need to be extracted from the ground.
Muddy construction site and the unnecessary earth need to be dump away from site.
ADVANTAGES OF BORED JACK SYSTEM
Site will be more tidy & clean. No collapse Bored Hole Issue . Low Risk of Pile ECC problem. Environmental friendly Method. Faster Construction Method as the boring
system only active when necessary. Cost Saving System.
Upper truss
Crowed cylinder
Adjusting cylinder
Lower truss
Main machine
Crane
Feeding Motor gear
Rotary head
DrillingRod andauger
Operation cabin
ITEM date
Drilling diameter Range ≤ Φ380mm
Drilling speed
Drilling head rotary speed 20—25r/min
Max drilling speed 3.5m/min
Drilling depth Max 45m
Feed motor gear Max torque 12000N.m
Rotary Drilling head Max torque 40000N.m
• Main Parameters
ITEM DATE
One set Main Jack in cylinder
Jack in force ( pressure 25Mpa) 307.5 tf
Max jack in speed (pressure <14 MPa) 7.0 m/min
Min jack in speed (pressure over 25 MPa) 2.2 m/min
One set main jack in cylinders& one setauxiliary cylinder
Jack in force ( pressure 25Mpa) 615 tf
Max jack in speed (pressure <14 MPa) 2.2m/min
Min jack in speed (pressure over 25 MPa) 1.3m/min
One set main jack in cylinders& Two sets
auxiliary cylinder
Jack in force ( pressure 25Mpa) 860 tf
Max jack in speed (pressure <14 MPa) 1.2m/min
Min jack in speed (pressure over 25 MPa) 0.8m/min
3.Jack in the first 12m spun pile until the pile not able to penetrate through the sand compacted sand layer.
4. Lift the 12m long auger
5- 12m long auger put into
the hole of first spun pile
6- Lifting the second 12m long auger and
the second spun pile together in position
7- Connect the second 12m long auger
with the first 12m long auger, the clamping
the pile and jack in the second pile. Connecting
the first and second pile at the available
position by welding
8- Lifting the third 12m long pile and
auger together.
9- Jack in the third pile, same
operation as step 7.
10- Connection 4m long drilling rod and 9 m
Long auger, then put into the fourth 12m pile.
11- Jack in the fourth pile ,same operation
As step 7, when the first pile reach the
density sand can not get through, move the
Upper truss, connect the rotary head and
the drilling rod, then start drilling the sand.
12- Drilling and jack in operation alternately.
Finally the pile reach the design request depth.