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Technical Composition of a Casing Extractor (Pipe Pulling Machine)
Time: 2025-02-15
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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.




II. Field Applications of a Casing Extractor

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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