Attachment 4 Drawing 4.pdf

This file is an architectural elevation drawing showing the exterior view of a skybridge and tower structure. The drawing depicts detailed technical specifications for a bridge connecting building sections, with particular focus on safety features including rail systems and anchorage points that appear to be related to window washing infrastructure. The drawing is labeled as "Elevations, Exterior" for the Portland Bridge project and was prepared by Skidmore, Owings & Merrill Zimmer Gunsul Frasca Partnership.

The drawing includes specific structural elements such as steel frames, glazing panels, and safety cables, with precise measurements and connection points marked throughout. Based on the federal contract opportunity details, this drawing specifically relates to the test rail anchors that need to be rated for 5000 lbs load capacity for window washing operations via bosun chair along both sides of the skybridge. Drawing number 100B, sheet B-4 provides the technical basis for contractors to understand the structural context where the rail anchor system will be installed.