A casing extractor is a specialized hydraulic equipment used in geotechnical and foundation engineering for the vertical extraction of steel casings, temporary sleeves, and embedded pipes after drilling operations. Its primary components are as follows:
I.
Component | Technical Description |
Main Frame Structure | Rigid steel frame providing axial alignment and structural integrity during extraction. |
Hydraulic Power Unit (HPU) | Diesel- or electric-powered system supplying high-pressure oil to drive hydraulic actuators. |
High-Force Hydraulic Cylinder | Generates linear pulling force for vertical casing extraction, typically rated for high-tonnage output. |
Hydraulic Clamping System | Self-locking or servo-controlled jaw mechanism to securely grip casings of various diameters. |
Vertical Guide Assembly | Ensures coaxial pipe movement, minimizes eccentric loads, and maintains operational safety. |
Centralized Control Console / Remote Operation Unit | Enables precise control of pulling speed, force, and clamping status; supports remote and manual operation modes. |
Casing extractors are widely deployed in civil infrastructure, energy development, and deep foundation works. Key applications include:
Application | Industry Use Case |
Post-Drilling Casing Retrieval | Extraction of temporary casings used in DTH drilling, CFA piling, and rotary drilling after completion of anchoring, grouting, or pile formation. |
Foundation Reinforcement Projects | Removal of jet grouting sleeves or temporary steel liners after soil stabilization or underpinning. |
Decommissioning of Underground Utilities | Pull-out of deformed, corroded, or redundant pipelines (e.g., water mains, conduits, sleeve pipes) from existing infrastructure. |
Pile and Caisson Construction | Extraction of conductor casings and protective tubes after concrete placement or well sinking. |
Obstruction Removal in Rescue/Remedial Operations | Application in emergency works to extract jammed or misaligned steel members from confined or obstructed boreholes. |
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