How Does 600mm Full Displacement Piling Compare to Cfa in Terms of Soil Suitabil
详细信息
How does 600mm Full Displacement Piling compare to CFA in terms of soil suitability, torque demand, and load capacity?
Comparing a 600mm Full Displacement Pile (FDP) to a standard 600mm Continuous Flight Auger (CFA) pile comes down to a trade-off between higher rig power demand (FDP) and superior soil shaft performance with zero spoil (FDP) versus broader soil adaptability (CFA).
600mm FDP vs. 600mm CFA Direct Comparison
Feature / Metric
600mm Full Displacement Pile (FDP)
600mm Continuous Flight Auger (CFA)
Primary Mechanism
Horizontal soil compaction & displacement
Vertical cutting & soil excavation
Spoil Generation
Near zero (ideal for contaminated ground)
High (~0.28 m³ spoil per linear meter)
Torque Demand
Very High (typically 180-250+ kNm)
Moderate (typically 90-150 kNm)
Crowd Requirement
High winch crowd needed to force expander bulb
Low to moderate crowd (cutting action)
Unit Skin Friction ()
1.5x to 2.5x higher in granular soils
Standard (baseline calculated values)
Production Speed
Fast in suitable soils (no spoil handling)
Fast, but slowed by site spoil cleanup
Vibration / Noise
Low noise, low vibration
Low noise, low vibration
Technical Performance Breakdown
1. Soil Suitability
FDP (Displacement): Works best in loose-to-medium dense granular soils (sands, gravelly sands, silts) and soft-to-medium cohesive clays. As the tool penetrates, it pushes soil laterally, densifying the surrounding ground.
Unsuitable for: Dense to very dense sand layers, hard clays (SPT N > 30-35), cobbles/boulders, or rock strata. In these formations, the soil cannot be laterally compressed, leading to rig refusal or severe wear on the displacement bulb.
CFA (Replacement): Works across a broader soil spectrum, including soft to hard clays, loose to dense sands, and weak/weathered rock formations. Because the continuous flights cut and convey material up to the surface, it does not rely on soil compressibility.
2. Torque & Rig Demand
FDP: Driving a 600mm displacement body requires substantially higher torque and downward crowd force than a CFA stem of the same diameter. On a rig like the Soilmec SR-65 (max torque ~258 kNm), a 600mm FDP tool pushes the hydraulic rotary and winch systems near peak operational limits in medium-dense ground.
CFA: Requires significantly lower torque because material is excavated rather than compacted. A rig capable of running 600mm FDP can typically drive an 800mm to 1000mm CFA auger under similar ground conditions.
3. Load Capacity & Geotechnical Efficiency
FDP (Higher Capacity per Meter): Because FDP displaces soil laterally into the borehole wall, it increases the horizontal effective stress () and soil density immediately adjacent to the pile shaft. This results in significantly higher unit skin friction ( and factors) compared to non-displacement piles. A 600mm FDP can often match or exceed the axial load capacity of an 800mm CFA pile, allowing for shorter pile lengths or smaller shaft volumes.
CFA (Standard Capacity): Relies on standard shaft friction and end bearing. In loose granular soils, the auger's shearing action can cause minor stress relief along the borehole wall, resulting in lower unit shaft resistance than an FDP shaft in the same soil profile.
600MM FDP AUGER WITH CFA COUPLING XHD5 match soilmec sr65 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling xhd5 match soilmec sr65 drill rig for fdp pile
600mm fdp auger wtih soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for fdp pile
600mm soilmec fdp auger with soilmec cfa hexagonal joint xhd5 match soilmec sr60 for full displacement pile
A complete 600 mm FDP tool string for the SR-65 consists of five primary components:
1.
Sacrificial Pilot Bit & Concrete Outlet
Heavy-duty pilot bit with tungsten-carbide teeth (bullet teeth or flat chisels) for initial penetration.
Internal concrete discharge valve (knock-out cap or flap valve) that prevents soil ingress during drilling and opens under concrete pump pressure during extraction.
2.
Helical Starter Flights
Short section of aggressive auger flighting at the tip that cuts into the soil and directs material upward toward the expanding body.
3.
Displacement Body (Expander Bulb)
A heavy-walled, tapered steel mandrel engineered to a 600 mm outer diameter.
Compresses surrounding soil laterally into the borehole wall, increasing soil density and shaft friction while eliminating spoil disposal costs.
4.
Counter-Flights (Reverse Flighting)
Reversed-pitch auger flights located directly above the displacement bulb.
Forces any loose soil back down toward the bulb during rotation to ensure zero surface spoil accumulation.
5.
Smooth Shaft / Extension Pipe & Drive Coupling
Thick-walled smooth steel casing stems (e.g., Ø300 mm to Ø406 mm inner tube) that extend to the required drilling depth while minimizing rotational skin friction.
Top coupling fitted with a heavy-duty hexagonal drive connector or flange matching the SR-65 rotary sleeve connector.
Required SR-65 Rig Conversion Kits & Accessories
To run a 600 mm FDP setup on the SR-65, the rig requires specific continuous-flight and displacement packages:
CFA/DP Quick Change Conversion Kit: Allows rapid changeover from Large Diameter Piling (LDP/Kelly) to Continuous Flight/DP mode via Plug & Play rotary adapters.
Lower Mast Auger Guide: Dual-gate hydraulic auger guide fitted with 600 mm inserts to maintain verticality during initial penetration.
Concrete Swivel & Hose Kit: Top-mounted swivel assembly rated for high concrete pumping pressure during continuous extraction.
Fdp drilling string can produce according to your requirement for diameter length and coupling
Full Displacement piles are bored cast in situ
concrete piles constructed by advancing a
displacement boring tool into the ground with
a rotary drilling rig using both torque and
crowed force.
The technique is ideally suited for a wide
spectrum of soil condition ranging from
sandy gravel, sand, silt and clay to soft
organic soils, so long as the soil is displaceable.
The particular advantage of Full Displacement Pile is the relatively simple technology
where no temporary casings are used.
Mexico 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,canada/Vancouver /Calgary toronto /Ottawa 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,colombia Medellín,Cartagena,Barranquilla,Tunja 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,Vietnam/Phòng/Thành Chí Minh 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,New Zealand/Auckland Australia Adelaide/Melbourne/Sydney/Brisbane 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,thailand 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec,Malaysia /Singapore Indonesia/Jakarta/Pilipines Россия/ruusia 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,belize/Puerto Rico/Guatemala/San salvador/Honduras 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,Ecuador Peru lima ,callao/Bolivia Chile Santiago de Chile Argentina/Uruguay/Paraguay,Brasil/Guyana 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,usa ,america los Angeles/new york/California 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,South Africa Kazakhstan 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , spain Português germany italy ,greece romania serbia,france 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec africa 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,south korea 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , japan 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , taiwan , hong kong 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec uae 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec israel 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,serbia 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec Tianjin huachang xingye technology co ltdHow does 600mm Full Displacement Piling compare to CFA in terms of soil suitability, torque demand, and load capacity?
Comparing a 600mm Full Displacement Pile (FDP) to a standard 600mm Continuous Flight Auger (CFA) pile comes down to a trade-off between higher rig power demand (FDP) and superior soil shaft performance with zero spoil (FDP) versus broader soil adaptability (CFA).
600mm FDP vs. 600mm CFA Direct Comparison
Feature / Metric
600mm Full Displacement Pile (FDP)
600mm Continuous Flight Auger (CFA)
Primary Mechanism
Horizontal soil compaction & displacement
Vertical cutting & soil excavation
Spoil Generation
Near zero (ideal for contaminated ground)
High (~0.28 m³ spoil per linear meter)
Torque Demand
Very High (typically 180-250+ kNm)
Moderate (typically 90-150 kNm)
Crowd Requirement
High winch crowd needed to force expander bulb
Low to moderate crowd (cutting action)
Unit Skin Friction ()
1.5x to 2.5x higher in granular soils
Standard (baseline calculated values)
Production Speed
Fast in suitable soils (no spoil handling)
Fast, but slowed by site spoil cleanup
Vibration / Noise
Low noise, low vibration
Low noise, low vibration
Technical Performance Breakdown
1. Soil Suitability
FDP (Displacement): Works best in loose-to-medium dense granular soils (sands, gravelly sands, silts) and soft-to-medium cohesive clays. As the tool penetrates, it pushes soil laterally, densifying the surrounding ground.
Unsuitable for: Dense to very dense sand layers, hard clays (SPT N > 30-35), cobbles/boulders, or rock strata. In these formations, the soil cannot be laterally compressed, leading to rig refusal or severe wear on the displacement bulb.
CFA (Replacement): Works across a broader soil spectrum, including soft to hard clays, loose to dense sands, and weak/weathered rock formations. Because the continuous flights cut and convey material up to the surface, it does not rely on soil compressibility.
2. Torque & Rig Demand
FDP: Driving a 600mm displacement body requires substantially higher torque and downward crowd force than a CFA stem of the same diameter. On a rig like the Soilmec SR-65 (max torque ~258 kNm), a 600mm FDP tool pushes the hydraulic rotary and winch systems near peak operational limits in medium-dense ground.
CFA: Requires significantly lower torque because material is excavated rather than compacted. A rig capable of running 600mm FDP can typically drive an 800mm to 1000mm CFA auger under similar ground conditions.
3. Load Capacity & Geotechnical Efficiency
FDP (Higher Capacity per Meter): Because FDP displaces soil laterally into the borehole wall, it increases the horizontal effective stress () and soil density immediately adjacent to the pile shaft. This results in significantly higher unit skin friction ( and factors) compared to non-displacement piles. A 600mm FDP can often match or exceed the axial load capacity of an 800mm CFA pile, allowing for shorter pile lengths or smaller shaft volumes.
CFA (Standard Capacity): Relies on standard shaft friction and end bearing. In loose granular soils, the auger's shearing action can cause minor stress relief along the borehole wall, resulting in lower unit shaft resistance than an FDP shaft in the same soil profile.
600MM FDP AUGER WITH CFA COUPLING XHD5 match soilmec sr65 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling xhd5 match soilmec sr65 drill rig for fdp pile
600mm fdp auger wtih soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for fdp pile
600mm soilmec fdp auger with soilmec cfa hexagonal joint xhd5 match soilmec sr60 for full displacement pile
A complete 600 mm FDP tool string for the SR-65 consists of five primary components:
1.
Sacrificial Pilot Bit & Concrete Outlet
Heavy-duty pilot bit with tungsten-carbide teeth (bullet teeth or flat chisels) for initial penetration.
Internal concrete discharge valve (knock-out cap or flap valve) that prevents soil ingress during drilling and opens under concrete pump pressure during extraction.
2.
Helical Starter Flights
Short section of aggressive auger flighting at the tip that cuts into the soil and directs material upward toward the expanding body.
3.
Displacement Body (Expander Bulb)
A heavy-walled, tapered steel mandrel engineered to a 600 mm outer diameter.
Compresses surrounding soil laterally into the borehole wall, increasing soil density and shaft friction while eliminating spoil disposal costs.
4.
Counter-Flights (Reverse Flighting)
Reversed-pitch auger flights located directly above the displacement bulb.
Forces any loose soil back down toward the bulb during rotation to ensure zero surface spoil accumulation.
5.
Smooth Shaft / Extension Pipe & Drive Coupling
Thick-walled smooth steel casing stems (e.g., Ø300 mm to Ø406 mm inner tube) that extend to the required drilling depth while minimizing rotational skin friction.
Top coupling fitted with a heavy-duty hexagonal drive connector or flange matching the SR-65 rotary sleeve connector.
Required SR-65 Rig Conversion Kits & Accessories
To run a 600 mm FDP setup on the SR-65, the rig requires specific continuous-flight and displacement packages:
CFA/DP Quick Change Conversion Kit: Allows rapid changeover from Large Diameter Piling (LDP/Kelly) to Continuous Flight/DP mode via Plug & Play rotary adapters.
Lower Mast Auger Guide: Dual-gate hydraulic auger guide fitted with 600 mm inserts to maintain verticality during initial penetration.
Concrete Swivel & Hose Kit: Top-mounted swivel assembly rated for high concrete pumping pressure during continuous extraction.
Fdp drilling string can produce according to your requirement for diameter length and coupling
Full Displacement piles are bored cast in situ
concrete piles constructed by advancing a
displacement boring tool into the ground with
a rotary drilling rig using both torque and
crowed force.
The technique is ideally suited for a wide
spectrum of soil condition ranging from
sandy gravel, sand, silt and clay to soft
organic soils, so long as the soil is displaceable.
The particular advantage of Full Displacement Pile is the relatively simple technology
where no temporary casings are used.
Mexico 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,canada/Vancouver /Calgary toronto /Ottawa 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,colombia Medellín,Cartagena,Barranquilla,Tunja 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,Vietnam/Phòng/Thành Chí Minh 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,New Zealand/Auckland Australia Adelaide/Melbourne/Sydney/Brisbane 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,thailand 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec,Malaysia /Singapore Indonesia/Jakarta/Pilipines Россия/ruusia 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,belize/Puerto Rico/Guatemala/San salvador/Honduras 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,Ecuador Peru lima ,callao/Bolivia Chile Santiago de Chile Argentina/Uruguay/Paraguay,Brasil/Guyana 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,usa ,america los Angeles/new york/California 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,South Africa Kazakhstan 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , spain Português germany italy ,greece romania serbia,france 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec africa 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,south korea 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , japan 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , taiwan , hong kong 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec uae 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec israel 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,serbia 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec Tianjin huachang xingye technology co ltd
Comparing a 600mm Full Displacement Pile (FDP) to a standard 600mm Continuous Flight Auger (CFA) pile comes down to a trade-off between higher rig power demand (FDP) and superior soil shaft performance with zero spoil (FDP) versus broader soil adaptability (CFA).
600mm FDP vs. 600mm CFA Direct Comparison
Feature / Metric
600mm Full Displacement Pile (FDP)
600mm Continuous Flight Auger (CFA)
Primary Mechanism
Horizontal soil compaction & displacement
Vertical cutting & soil excavation
Spoil Generation
Near zero (ideal for contaminated ground)
High (~0.28 m³ spoil per linear meter)
Torque Demand
Very High (typically 180-250+ kNm)
Moderate (typically 90-150 kNm)
Crowd Requirement
High winch crowd needed to force expander bulb
Low to moderate crowd (cutting action)
Unit Skin Friction ()
1.5x to 2.5x higher in granular soils
Standard (baseline calculated values)
Production Speed
Fast in suitable soils (no spoil handling)
Fast, but slowed by site spoil cleanup
Vibration / Noise
Low noise, low vibration
Low noise, low vibration
Technical Performance Breakdown
1. Soil Suitability
FDP (Displacement): Works best in loose-to-medium dense granular soils (sands, gravelly sands, silts) and soft-to-medium cohesive clays. As the tool penetrates, it pushes soil laterally, densifying the surrounding ground.
Unsuitable for: Dense to very dense sand layers, hard clays (SPT N > 30-35), cobbles/boulders, or rock strata. In these formations, the soil cannot be laterally compressed, leading to rig refusal or severe wear on the displacement bulb.
CFA (Replacement): Works across a broader soil spectrum, including soft to hard clays, loose to dense sands, and weak/weathered rock formations. Because the continuous flights cut and convey material up to the surface, it does not rely on soil compressibility.
2. Torque & Rig Demand
FDP: Driving a 600mm displacement body requires substantially higher torque and downward crowd force than a CFA stem of the same diameter. On a rig like the Soilmec SR-65 (max torque ~258 kNm), a 600mm FDP tool pushes the hydraulic rotary and winch systems near peak operational limits in medium-dense ground.
CFA: Requires significantly lower torque because material is excavated rather than compacted. A rig capable of running 600mm FDP can typically drive an 800mm to 1000mm CFA auger under similar ground conditions.
3. Load Capacity & Geotechnical Efficiency
FDP (Higher Capacity per Meter): Because FDP displaces soil laterally into the borehole wall, it increases the horizontal effective stress () and soil density immediately adjacent to the pile shaft. This results in significantly higher unit skin friction ( and factors) compared to non-displacement piles. A 600mm FDP can often match or exceed the axial load capacity of an 800mm CFA pile, allowing for shorter pile lengths or smaller shaft volumes.
CFA (Standard Capacity): Relies on standard shaft friction and end bearing. In loose granular soils, the auger's shearing action can cause minor stress relief along the borehole wall, resulting in lower unit shaft resistance than an FDP shaft in the same soil profile.
600MM FDP AUGER WITH CFA COUPLING XHD5 match soilmec sr65 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling xhd5 match soilmec sr65 drill rig for fdp pile
600mm fdp auger wtih soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for fdp pile
600mm soilmec fdp auger with soilmec cfa hexagonal joint xhd5 match soilmec sr60 for full displacement pile
A complete 600 mm FDP tool string for the SR-65 consists of five primary components:
1.
Sacrificial Pilot Bit & Concrete Outlet
Heavy-duty pilot bit with tungsten-carbide teeth (bullet teeth or flat chisels) for initial penetration.
Internal concrete discharge valve (knock-out cap or flap valve) that prevents soil ingress during drilling and opens under concrete pump pressure during extraction.
2.
Helical Starter Flights
Short section of aggressive auger flighting at the tip that cuts into the soil and directs material upward toward the expanding body.
3.
Displacement Body (Expander Bulb)
A heavy-walled, tapered steel mandrel engineered to a 600 mm outer diameter.
Compresses surrounding soil laterally into the borehole wall, increasing soil density and shaft friction while eliminating spoil disposal costs.
4.
Counter-Flights (Reverse Flighting)
Reversed-pitch auger flights located directly above the displacement bulb.
Forces any loose soil back down toward the bulb during rotation to ensure zero surface spoil accumulation.
5.
Smooth Shaft / Extension Pipe & Drive Coupling
Thick-walled smooth steel casing stems (e.g., Ø300 mm to Ø406 mm inner tube) that extend to the required drilling depth while minimizing rotational skin friction.
Top coupling fitted with a heavy-duty hexagonal drive connector or flange matching the SR-65 rotary sleeve connector.
Required SR-65 Rig Conversion Kits & Accessories
To run a 600 mm FDP setup on the SR-65, the rig requires specific continuous-flight and displacement packages:
CFA/DP Quick Change Conversion Kit: Allows rapid changeover from Large Diameter Piling (LDP/Kelly) to Continuous Flight/DP mode via Plug & Play rotary adapters.
Lower Mast Auger Guide: Dual-gate hydraulic auger guide fitted with 600 mm inserts to maintain verticality during initial penetration.
Concrete Swivel & Hose Kit: Top-mounted swivel assembly rated for high concrete pumping pressure during continuous extraction.
Fdp drilling string can produce according to your requirement for diameter length and coupling
Full Displacement piles are bored cast in situ
concrete piles constructed by advancing a
displacement boring tool into the ground with
a rotary drilling rig using both torque and
crowed force.
The technique is ideally suited for a wide
spectrum of soil condition ranging from
sandy gravel, sand, silt and clay to soft
organic soils, so long as the soil is displaceable.
The particular advantage of Full Displacement Pile is the relatively simple technology
where no temporary casings are used.
Mexico 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,canada/Vancouver /Calgary toronto /Ottawa 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,colombia Medellín,Cartagena,Barranquilla,Tunja 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,Vietnam/Phòng/Thành Chí Minh 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,New Zealand/Auckland Australia Adelaide/Melbourne/Sydney/Brisbane 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,thailand 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec,Malaysia /Singapore Indonesia/Jakarta/Pilipines Россия/ruusia 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,belize/Puerto Rico/Guatemala/San salvador/Honduras 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,Ecuador Peru lima ,callao/Bolivia Chile Santiago de Chile Argentina/Uruguay/Paraguay,Brasil/Guyana 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,usa ,america los Angeles/new york/California 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,South Africa Kazakhstan 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , spain Português germany italy ,greece romania serbia,france 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec africa 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,south korea 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , japan 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec , taiwan , hong kong 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec uae 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec israel 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec ,serbia 600 FDP auger tools with soilmec cfa coupling xhd5 match soilmec Tianjin huachang xingye technology co ltdHow does 600mm Full Displacement Piling compare to CFA in terms of soil suitability, torque demand, and load capacity?
Comparing a 600mm Full Displacement Pile (FDP) to a standard 600mm Continuous Flight Auger (CFA) pile comes down to a trade-off between higher rig power demand (FDP) and superior soil shaft performance with zero spoil (FDP) versus broader soil adaptability (CFA).
600mm FDP vs. 600mm CFA Direct Comparison
Feature / Metric
600mm Full Displacement Pile (FDP)
600mm Continuous Flight Auger (CFA)
Primary Mechanism
Horizontal soil compaction & displacement
Vertical cutting & soil excavation
Spoil Generation
Near zero (ideal for contaminated ground)
High (~0.28 m³ spoil per linear meter)
Torque Demand
Very High (typically 180-250+ kNm)
Moderate (typically 90-150 kNm)
Crowd Requirement
High winch crowd needed to force expander bulb
Low to moderate crowd (cutting action)
Unit Skin Friction ()
1.5x to 2.5x higher in granular soils
Standard (baseline calculated values)
Production Speed
Fast in suitable soils (no spoil handling)
Fast, but slowed by site spoil cleanup
Vibration / Noise
Low noise, low vibration
Low noise, low vibration
Technical Performance Breakdown
1. Soil Suitability
FDP (Displacement): Works best in loose-to-medium dense granular soils (sands, gravelly sands, silts) and soft-to-medium cohesive clays. As the tool penetrates, it pushes soil laterally, densifying the surrounding ground.
Unsuitable for: Dense to very dense sand layers, hard clays (SPT N > 30-35), cobbles/boulders, or rock strata. In these formations, the soil cannot be laterally compressed, leading to rig refusal or severe wear on the displacement bulb.
CFA (Replacement): Works across a broader soil spectrum, including soft to hard clays, loose to dense sands, and weak/weathered rock formations. Because the continuous flights cut and convey material up to the surface, it does not rely on soil compressibility.
2. Torque & Rig Demand
FDP: Driving a 600mm displacement body requires substantially higher torque and downward crowd force than a CFA stem of the same diameter. On a rig like the Soilmec SR-65 (max torque ~258 kNm), a 600mm FDP tool pushes the hydraulic rotary and winch systems near peak operational limits in medium-dense ground.
CFA: Requires significantly lower torque because material is excavated rather than compacted. A rig capable of running 600mm FDP can typically drive an 800mm to 1000mm CFA auger under similar ground conditions.
3. Load Capacity & Geotechnical Efficiency
FDP (Higher Capacity per Meter): Because FDP displaces soil laterally into the borehole wall, it increases the horizontal effective stress () and soil density immediately adjacent to the pile shaft. This results in significantly higher unit skin friction ( and factors) compared to non-displacement piles. A 600mm FDP can often match or exceed the axial load capacity of an 800mm CFA pile, allowing for shorter pile lengths or smaller shaft volumes.
CFA (Standard Capacity): Relies on standard shaft friction and end bearing. In loose granular soils, the auger's shearing action can cause minor stress relief along the borehole wall, resulting in lower unit shaft resistance than an FDP shaft in the same soil profile.
600MM FDP AUGER WITH CFA COUPLING XHD5 match soilmec sr65 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling xhd5 match soilmec sr65 drill rig for fdp pile
600mm fdp auger wtih soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for full displacement pile
600MM full displacement pile auger with soilmec cfa coupling 25hd5 match soilmec sr75 drill rig for fdp pile
600mm soilmec fdp auger with soilmec cfa hexagonal joint xhd5 match soilmec sr60 for full displacement pile
A complete 600 mm FDP tool string for the SR-65 consists of five primary components:
1.
Sacrificial Pilot Bit & Concrete Outlet
Heavy-duty pilot bit with tungsten-carbide teeth (bullet teeth or flat chisels) for initial penetration.
Internal concrete discharge valve (knock-out cap or flap valve) that prevents soil ingress during drilling and opens under concrete pump pressure during extraction.
2.
Helical Starter Flights
Short section of aggressive auger flighting at the tip that cuts into the soil and directs material upward toward the expanding body.
3.
Displacement Body (Expander Bulb)
A heavy-walled, tapered steel mandrel engineered to a 600 mm outer diameter.
Compresses surrounding soil laterally into the borehole wall, increasing soil density and shaft friction while eliminating spoil disposal costs.
4.
Counter-Flights (Reverse Flighting)
Reversed-pitch auger flights located directly above the displacement bulb.
Forces any loose soil back down toward the bulb during rotation to ensure zero surface spoil accumulation.
5.
Smooth Shaft / Extension Pipe & Drive Coupling
Thick-walled smooth steel casing stems (e.g., Ø300 mm to Ø406 mm inner tube) that extend to the required drilling depth while minimizing rotational skin friction.
Top coupling fitted with a heavy-duty hexagonal drive connector or flange matching the SR-65 rotary sleeve connector.
Required SR-65 Rig Conversion Kits & Accessories
To run a 600 mm FDP setup on the SR-65, the rig requires specific continuous-flight and displacement packages:
CFA/DP Quick Change Conversion Kit: Allows rapid changeover from Large Diameter Piling (LDP/Kelly) to Continuous Flight/DP mode via Plug & Play rotary adapters.
Lower Mast Auger Guide: Dual-gate hydraulic auger guide fitted with 600 mm inserts to maintain verticality during initial penetration.
Concrete Swivel & Hose Kit: Top-mounted swivel assembly rated for high concrete pumping pressure during continuous extraction.
Fdp drilling string can produce according to your requirement for diameter length and coupling
Full Displacement piles are bored cast in situ
concrete piles constructed by advancing a
displacement boring tool into the ground with
a rotary drilling rig using both torque and
crowed force.
The technique is ideally suited for a wide
spectrum of soil condition ranging from
sandy gravel, sand, silt and clay to soft
organic soils, so long as the soil is displaceable.
The particular advantage of Full Displacement Pile is the relatively simple technology
where no temporary casings are used.
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