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C.F.A.
CONTINUOUS FLIGHT AUGER PILES
G r o u n d E n g i n e e r i n g E q u i p m e n t
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C.F.A.
CONTINUOUS FLIGHT AUGER PILES
The CFA piles - drilled by continuous flight auger system - combine the advantages of the driven piles with the versality
of the bored piles.
The drilling method allows to excavate in a wide variety of soils, dry or water-logged, loose or cohesive , and also to
penetrate through low capacity, soft rock formations such as loamy clays, limestones and sandstone, etc.
No shocks or vibrations are induced when the system is performed; in addition the equipment is fully sound - proofed,
as per law requirements, making CF A the most convenient piling method for construction in town centres.
The execution of the pile with almost of the soil allows to work close to the existing structures. Besides, no bentonite mud
is needed for the excavation, which means that provision and space for the side plant are reduced, there is no danger of
bentonite contamination and, consequently, all problems connected to the disposal of the excavated materials are simplified.
The reduced volume of soil brought up to surface by the flight auger means less amount of excavated material which
has to be trasported to the disposal point.
The range of diameters from 40 to 140 cm and depths up to 33 m, allows to overcome problems connected
to the project and execution of the pilings.
Soilmec experience gained in approximately 30 years in the execution of CFA pile, enables to operate the system even
in difficult grounds, thanks to the use of different teeth and augers.
Drilling method
Drilling is performed by an helicoidal steel plate welded to a central hollow stem which is provided at the lower part with
teeth to help penetration through the ground. A disposable cap, fitted as plug at the end of the stem, prevents entering
of the soil when the auger string is driven down. The ground is partially pressed sideways by the auger penetration, which
results in a compaction of the soil all around the shaft.
The equipment generally consists of a flanged or tubolar type leader - depending length on pile depth - and of a crawler
unit on which the leader is mounted.
Alternatively, the auger system is operated by self-erecting fully hydraulic rigs type R-Series and CM-Series that SOILMEC
has especially designed for the CFA pile.
Main Equipment
Model
max nominal
max nominal
max nominal
nominal
max operating
diameter
depth
torque
drilling speed
max engine power extraction force
weight
mm
m
kNm
rpm
kW
kN
t
CM-50
CM-70
CM-700
CM-120
CM-1200
R-210
A
R-312/200
R-416
A
R-516 HD
R-620
R-625
R-725
R-825
R-930
A
R-1240
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Casting of the pile
The concrete is cast through the auger hollow stem by means of a proper concrete pump.
The pump is connected through a hose (4” to 6” diam.) to a feed swivel fitted on the rotary head. When the required
depth is reached, concrete is pumped through the string stem and the auger is lifted; the concrete gradually fills the voids
left by the auger which is then extracted without being rotated or, just slowly, in the same driving direction.
The integrity of the pile is assured by a constant control of the pressure on the concrete column by means of proper
transducers fitted on the equipment.
RING
CONSTRUCTION STAGES
RING
RING
RING
Concrete casting
and auger extraction
Casting
completion
Steel cage
insertion
Augering
RING
Continuous Flight Auger
AUGER
CENTRAL STEM
SOILMEC
MODEL
Diameter
(mm)
Outer diam.
(mm)
Inner passage
(mm)
RING
HD 4
350
¸
800
140
100
BOTTOM RING
HD 5
450
¸
1000
160
125
D
Concrete
The concrete used for the CFA pile is generally prepared with aggregates of fine round gravel (max size 15 mm) and sand
ranging from 0.4 to 0.5 mm in size. The cement contents vary from 350 to 450 kg/m 3 with water/cement ratio equal to
0.45 approximately. The slump should be mantained between 190 and 210 mm. Occasionally the use of fluidizing additives
may be suggested.
Reinforcement
The method of construction of the CFA pile requires the cage to be inserted when casting is completed.
SPIRAL
Main Equipment
Pile
diameter
mm.
Suggested cage
Spiral
Diam. of
ring bar
Cage dimension
d1 (mm)
Number of bars
Diam. (mm)
Diam. of bar (mm)
Pitch (mm)
d2 (mm)
400
6
18
8
20
ø 14
200
150
D
450
6
18
8
20
ø 14
250
200
RING
500
6
18
8
20
ø 14
300
250
600
6
18
8
20
ø 16
400
350
700
6
20
8
20
ø 16
500
450
d1
800
8
20
8
20
ø 16
600
550
BOTTOM RING
900
8
24
10
20
ø 20
700
650
1000
10
24
10
20
ø 20
800
750
1200
12
24
10
20
ø 20
1000
950
d2
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C.F.A.
CM-50
CONTINUOUS FLIGHT AUGER PILES
On the basis of the experience gained with the series CM-45, 46 and 48 the new rig CM-50 represent the last development
of the equipment series with continuous auger.
The equipment, which is assembled on a Soilmec base, has been designed in order to perform:
- Continuous flight auger piles
- D.T.H.
The features qualifying the new CM-50 series are:
- completely self-erecting system
- modern instrumentation
- reliability and safety at the job site
- quick installation
- extendible tracks
- easy manoeuvrability
- low transport costs
- high production
OPTIONAL
- Track shoes 700 mm or 900 mm wide.
- Grids for the cab front protection.
- Air conditioning or heating system for the cab.
- Two-axle electronic inclinometer in the cab.
- Electronic power pack for the control of the extraction pull; it is provided with visual and sound alarms in case of fortuitous
overloading.
- Side ladder on mast complete with parachute.
- 4'' or 5'' concrete pipework on the mast, supplied with insulation, upon request, in case of tropical climates.
- Auger cleaner.
- Power take off for the VTH-1 vibrator to carry out the cage driving.
DRILLING PERFORMANCES
Max. pile depth
Max. pile depth w. auger cleaner
Max. pile diameter
m
19 (+ 6 extension)
m
17,5 (+ 6 extension)
mm
900
Max. extraction force
kN
510
UNDERCARRIAGE
Overall length
Track shoe width
Overall width (opened tracks)
Overall width (closed tracks)
Ground pressure
mm
mm
4660
700
4000
2500
900
mm
4200
mm
2900
0.05
0.07
MPa
DIESEL ENGINE
Make / Model
Cummins QSB5.9C
kW (HP)
153 (205) @ 2200 rpm
Max. power
HIDRAULIC PUMPS
Theoretical delivery
Working pressure
lt/min
320
300
35
250
23
160
23
50
1
2
3
4
bar
MAIN WINCH
Max. nominal pull
kN
102
Nominal rope speed
m/min
70
Rope diam.
mm
19
SERVICE WINCH
Max. nominal pull
kN
37
1 st layer nominal rope speed
m/min
37
Rope diam.
mm
16
ROTARY TABLE
Max. torque
VARIABLE MOTOR WITH AXIAL PISTONS
kNm
rpm
kN
86 @ 11,2 rpm
41
510
Max drilling speed
Max. nominal extraction pull
DIMENSIONS AND WEIGHT
Transport width (with 700 mm shoes)
Transport height
Operating weight
mm
2500 (2900 with 900 mm shoes)
mm
ton
3190
39
Transport weight
ton
33,5
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C.F.A.
CM-50
CONTINUOUS FLIGHT AUGER PILES
øMAX 90 0
500
3410
2767
7249
Transport Condition - Standard version
16363
2917
4664
3405
8782
15218
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