Jansen Hoist Crosshead ArrangementImproving the conventional arrangement to decrease operational exposure

Jerrid Matsalla, Project Engineer - TRLKyle Zielke, Project Engineer - BHP

Conventional Crosshead Arrangement

• Crosshead supported by the hoist rope and uses the winch ropes to help keep conveyances centered and guide it down the shaft.

• Provides head cover for the attached conveyance.

• Various conveyances for each task in the shaft such as personnel travel, concrete delivery, material movement, shaft inspection, etc.

– Each conveyance change requires removal off hoist hook before attaching new conveyance to hoist hook.

– Attached conveyance is only guided by crosshead and can rotate freely.

227 February 2020Jansen Crosshead Arrangement

Opportunity for reducing the exposure to shaft risks

• Due to the requirement for ground freeze during shaft sinking, ice buildup on the shaft walls is a constant risk

• Primary exposure to this ice is during shaft travel, shaft inspections and during scaling activities

• Lack of robust overhead coverage created a situation where inspection and scaling could only be done from an enclosed bucket reducing the effectiveness of work out of the bucket.

27 February 2020Jansen Crosshead Arrangement

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Current Jansen Crosshead ArrangementWhy the change

• Completion of the sinking scope and transition to the shaft lining scope created the need for a new galloway and new rope arrangement.

– Created the opportunity to change the conveyance configuration

• Lining scope includes the requirement for slinging large plate down the shaft that must be well controlled.

• Contractor joint venture was able to bring in industry best practice.

427 February 2020Jansen Crosshead Arrangement

Current Jansen Crosshead ArrangementWhat changed

• Crosshead still supported by the hoist rope and connected to the winch ropes as guides.

• Personnel bucket has fixed connection to hoist rope and will not be removed for the duration of the project

• Secondary conveyances can be attached directly underneath the personnel bucket eliminating the need to change conveyances as frequently and decreasing time required for changeover.

• Rotation of the conveyance can be prevented using lock arms.

• Additional rigging points under the personnel bucket provide multiple options for slinging equipment and gear.

527 February 2020Jansen Crosshead Arrangement

627 February 2020Jansen Crosshead Arrangement

Current Jansen Crosshead Arrangement

Changes affecting operational exposure of personnel

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• Rigid connection between buckets means the personnel bucket is always left on the hoist rope and all additional conveyances are designed to fit under it.

– Quicker availability of the cage in the event of an evacuation;

– Increased head cover during shaft inspections;– Eliminate hazard of repeated hooking and unhooking

of heavy master link and chain bridal from hoist hook.

• Rotation lock arms on crosshead which holds the personnel bucket and underslung equipment/gear.

• Multiple connection points for underslung pieces can reduce the chance of plate contacting a winch rope while lowering.

• Better overhead protection due to working under the personnel bucket instead of just the crosshead while in the shaft.

27 February 2020Jansen Crosshead Arrangement