MORDEN MINE SHORING

ISL was retained to provide structural design review for a shoring plan utilizing timber and conventional steel shipping containers.

Client: City of Nanaimo

Location: Nanaimo, BC

Project Type: Structural РBuildings

ISL’s Role: Subconsultant

About This Project

The Morden Mine Tipple is in Morden Colliery Historic Provincial Park, Nanaimo, BC. The tipple is a concrete structure and was built in 1913 by the Pacific Coal Company. The Tipple is all that remains of the Morden Coal Mine and at present this concrete structure is fenced off to the public. Repairs were proposed to the structure to extend its lifespan and mitigate the risk of collapse.

For any repairs to be undertaken it was recommended that specific portions of the structure are shored. The shoring scheme was intended to reduce the risk of catastrophic collapsing of the global structure should an isolated member fail prior to or during the course of repair work.

ISL was retained to provide structural design review for a shoring plan utilizing timber and conventional steel shipping containers.

The concrete structure is in a deteriorated state due to exposure to the elements and multiple years of freeze-thaw cycles. The structure is an unknown reinforcement and concrete mix design. The structure was modeled in 3D to rationalize and quantify alternate load paths should a member fail. The containers and timber were suitable shoring due to their high structural capacity, large size, and relatively low cost. 

A large portion of the head frame columns/beams and multiple columns beneath the hopper and tipples showed major deterioration and many column bases displayed deterioration. There was a general concern for the stability of the structure for public and worker safety. A hybrid system of shoring and worker access constructed from timber cribbing, container modules and cable tensioned anchors guyed to ground anchors ensured worker safety.

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