1200mm hydraulic casing extractor with electricity motor power pack used for pull out od1200mm double wall casing during secant pile foundation work
1200mm hydraulic casing puller used for pull out double wall casing in cased bored pile foundation work
Casing extractor hydraulic type od1200mm used for pull out 1200mm double wall casing in secant pile foundation work
1180mm hydraulic casing extractor used for pull out od1180/1100mm double wall casing pile
1200mm Hydraulic Casing Extractor with 1000mm Reduction Insert Used for Pull out Od1200mm Double Wall Casing During Secant Pile Foundation Work
1000mm hydraulic casing extractor with 880mm reduction insert used for pull out od1000/id920mm double wall casing during secant pile foundation work 880mm hydraulic casing extractor used for pull out od880/id800mm double wall casing during secant pile foundation work 1500mm hydraulic casing extractor with 1200mm reduction insert used for pull out od1500/id1400mm double wall casing during secant pile foundation work  1600mm hydraulic casing extractor  used for pull out od1600/id1520mm double wall casing during secant pile foundation work 1800mm hydraulic casing extractor  used for pull out od1800/id1700mm double wall casing during secant pile foundation work 2000mm hydraulic casing extractor  used for pull out od1800/id1700mm double wall casing during secant pile foundation work
Tianjin huachang xingye technology co ltd  can produce 400-3000mm casing extractor , can add different size reduction insert suit to different casing pipe , our hydraulic casing extractor can use different hydraulic power pack Diesel engine power and electricity motor power pack. They are hydraulic clamping machines to pull out casing pile pipe or similar pipe. Pull out casing pile pipe or similar pipe. They may be coupled to the base pile machine by means of telescopic boom or they can work alone with its own hydraulic power pack

B1200 CASING EXTRACTOR  DRAWING
 
NAME
UNIT
PARAMETER
REMARK

LIFT CYLINDER QUANTITY
PC
4
 

CYLINDER MAX STROKE
mm
1000
 

HOLD CYLINDER QUANTITY
PC
1
 

MAX HOLDER FORCE
t
150
 

MAX CASING DIAMETER
mm
1200
 

RATED LIFT FORCE
t
400
BELOW 30MPa

WEIGHT
kg
6100
 

OUT SIZE(L×W×H)
m
3x2.2x2M
TRANSPORT SIZE

Specification of diesel engine power pack
MODEL
       specification
note

POWER
QSB3.9-C80
CHINA STANDARD  4 emissions

Engine power kW
75
 

big pump discharge l/min
150
 

Small pump discharge L/min
45
 

Working pressure:MPa
25
 

Hydraulic oil capacity L
900
 

Hydraulic oil number
YB-N46
 

oversize(l×W×H)(mm)
3000×2000×1700
 

WEIGHT  (kg)
2000
 

hydraulic casing extractor (often referred to as a casing jack or casing puller) is a specialized piece of heavy equipment used to retrieve temporary steel casings from the ground. While drilling rigs have their own pull-back force, they often lack the massive power required to overcome the skin friction of deep or large-diameter casings, especially in dense or "seizing" soils.
1. How It Works
The extractor acts as an auxiliary lifting unit. It consists of a heavy-duty frame, high-pressure hydraulic cylinders, and a clamping mechanism.
Clamping: The unit is positioned over the casing. Hydraulic jaws or a clamping ring "bite" onto the top of the steel casing.
Lifting (Jacking): Large hydraulic cylinders push against the ground (or a base plate) to lift the casing upward. This provides significantly more force (often hundreds of metric tons) than a standard crane or drilling rig.
Sequential Extraction: The casing is lifted in increments (strokes). Once the cylinders reach full extension, the clamp is released, the cylinders retract, and the process repeats until the friction is reduced enough for the drilling rig to take over.


2. Types of Extraction Equipment
Depending on the project requirements and the diameter of the casing, different configurations are used:
Type
Best For
Mechanism

Hydraulic Casing Jack
Recovery of stuck casings or very deep piles.
Pure vertical lifting force via 2 or 4 cylinders.

Casing Oscillator
Simultaneous drilling and extraction.
Rotates the casing back and forth (oscillates) while pushing/pulling.

Vibratory Hammer
Sand or non-cohesive soils.
Uses high-frequency vibration to "liquefy" the soil contact and reduce friction.

3. Key Technical Specifications
When evaluating a hydraulic extractor, the following parameters are critical:
Lifting Force: Usually measured in kilonewtons (kN) or tons. Common units range from 2,000 kN to over 10,000 kN (approx. 200 to 1,000 tons).
Stroke Length: The distance the cylinders can move in one cycle (typically 400mm to 1,000mm).
Clamping Force: The pressure applied to the casing to prevent slippage during the lift.
Maximum Diameter: The largest casing size the unit can accommodate (e.g., 2,000mm, 2,500mm, or 3,000mm).

4. When is an Extractor Necessary?
High Skin Friction: In stiff clays or dense sands where the surface area of the casing creates resistance beyond the rig's capacity.
Extended "Set" Time: If concrete pouring takes longer than expected, the casing can become "bound" to the surrounding soil as it settles.
Obstructions: If a casing becomes deformed or wedged against boulders or old foundations.
Deep Bored Piles: For piles exceeding 50–60 meters where the total weight and friction of the casing string are immense.
5. Operational Considerations
Base Stability: The ground around the borehole must be reinforced or use large spreader plates. Because the extractor pushes down on the soil to pull the casing up, poor ground stability can lead to the extractor sinking or the borehole collapsing.
Synchronization: It is vital to ensure the cylinders extend at the same rate to avoid tilting the casing, which can cause it to jam or damage the steel joints.