Attachment 3 Bat Cupola.pdf

This is a technical specification document from the Colorado Inactive Mine Reclamation Program detailing the design and installation requirements for a bat cupola shaft grating system. The document specifies the construction of a shaft grate alternative featuring a bat cupola structure designed to accommodate bat populations while securing inactive mine shafts. The grating specifications include 1 1/4" x 3/16" bearing bars spaced at 1 3/16" on center with 1/4" round cross rods spaced at 4" on center, type WXA (19-4-53), with cross rods positioned on the inside of the grate frame. The cupola frame construction requires 2"x2"x 1/4" angle material, and the opening in the shaft grate must be framed with matching 2"x2"x 1/4" angle. The bat cupola shall extend a minimum of 24 inches above the shaft grating and be welded to the framed opening. The document includes side view and plan view technical drawings illustrating the proper assembly and positioning of all components relative to the 6" shaft grating.

No information regarding pricing, bidding timelines, contract terms, funding sources, or procurement procedures is contained within this technical specification document. This file functions solely as a design guide for contractors and engineers implementing shaft grating and bat cupola installations under Colorado's Inactive Mine Reclamation Program.