Multi-trade rack mock-up in Coquitlam

On February 22 and 29, members from the DCDH PMO, Graham, HDR and subcontractor representatives attended an in-person mock-up review of a typical multi-trade rack in Coquitlam to provide feedback and discuss the pre-fabrication design.

A multi-trade rack (MTR) is a steel frame structure that contains elements such as ductwork, water lines, heating pipes, sprinkler lines, valves, VAV boxes, steel studs and drywall, electrical components and anything else that is located in the ceiling of a corridor.

Part of the project strategy is to pre-fabricate large components of the new Dawson Creek & District Hospital using MTRs. There will be approximately 90 in the new facility varying in size between 16’ to 24’ long.

While in production, three MTRs will be built per week. Fabrication is done based on an established sequence of activities so as to facilitate assembly-line like production to maximize completion output.

Once they are fabricated, the MTRs will undergo inspection and testing and then be shrink wrapped and shipped to Dawson Creek starting as early as July.

Once the MTRs arrive on-site, they’ll be lifted up with the tower crane, rolled onto the floor into position, inspected again, hoisted up into the ceiling space, and then bolted to the underside of the suspended slab. Once they are installed, the two-foot gap between each one will be in-filled, inclusive of all the mechanical and electrical services and drywall.

Pre-fabricating the MTRs off-site allows for them to be completed while work is still underway on the concrete superstructure as opposed to waiting until that work is complete. This method is also quicker, more cost effective, improves quality control, and is safer as it prevents workers having to work at heights.

Note: Image is from another project showing the MTR being lifted by the crane