1200mm hydraulic casing puller used for pull out double wall casing in cased bored pile foundation work

1200mm hydraulic casing extractor with Europe tier5 diesel engine power pack for secant pile foundation work 1200mm hydraulic casing extractor used for pull out 1200mm double wall casing during cased bored pile foundation work 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 1.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 1.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.