Case Study: Replacement guide rope into modified vent shaft with limited access

Requirements: Develop a plan to safely remove existing rope and install new guide rope.  The work was to be performed at an egress shaft which had been modified to act as a primary downcast ventshaft for the mine site.

A detailed procedure was developed in co-operation with site and contractor personnel.  The procedure was prepared to limit exposures and mitigate risks presented by restricted work spaces and limited communications. 

Engineering drawing packages were prepared for rigging fixtures to be installed in the headframe for rope handling.  The fixtures were installed within existing structural constraints created by fan shrouding in the headframe and the limited access to the shaft.

Existing winch equipment was evaluated and tested.  New rope anchors were designed and installed to allow maximum removal of the rope from the drum during moves.

On-site support was provided for all critical phases of the project including development, design, fixture installation and removal and installation of the rope.

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Case Study: Replacement of a roller element bearing on the main shaft of a large double drum hoist

Requirements: The bearing inboard of a direct-drive motor on the main shaft of a large hoisting plant experienced premature failure.  A plan was required to remove the large roller element bearing while minimizing downtime on the only production hoist at the mine site. 

A detailed procedure was developed to safely replace the bearing while minimizing interruptions to the operation of the mine site.  The procedure detailed removal of the large 1,000 hp direct drive AC motor stator and rotor as well as lifting the drum assembly to allow removal of the bearing from the housing.

Detailed drawing packages were prepared for fixturing and rigging to lift the motor rotor and hoist drum assembly.  Specialized hydraulic tooling was specified to evenly raise the hoist assembly.  Procedures provided detailed listings of all rigging equipment and specialty tools as well as target values for re-installation of the bearing and other hoist mechanicals. 24-hour on site support was provided during the removal to support heavy lifts and ensure the return of the hoist to safe operating conditions prior to resuming normal operations.

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