11 24 24-022_PSN_As-Builts_Tractel_Stamped_Calcs.pdf

This document is a comprehensive engineering design and calculation package for davit equipment (boom-suspended window-washing systems) prepared for the Denver Veterans Affairs facility by Tractel Ltd.'s Swingstage Division. The project, numbered 11-8C40, was completed on July 15, 2013, for client Kiewit-Turner Joint Venture in Aurora, Colorado, and includes 49 sheets of technical specifications, calculations, and design details.

The package specifies design and mechanical properties for window-washing equipment with a suspension load of 1.25 kips and an 8-foot 6-inch boom reach. Material specifications include steel conforming to CAN/CSA G40.21 standard (Type 44W and 50W grades) and aluminium conforming to ANSI/AWS D1.2-97 standard. Key components detailed include: a standard flush portable davit base with pedestal support (HSS 8 5/8" O.D. x 3/16" wall), an 8-inch SCH40 aluminum mast pipe (6061-T6 material), davit arm support frame with multiple mounting bolts (7/8" through 1.25" diameters), safety tie-back anchors rated for 5,000 lbs per OSHA requirements, and a TirSmart support line system. The design incorporates a safety factor of 4 against failure for window-washing equipment. Engineering calculations demonstrate compliance across bearing strength, shear capacity, bending stress, weld sizing, and bolt load checks for all structural elements. Tie-back anchors are designed for fall arrest equipment rated at 5,000 lbs with pedestal tubes manufactured from HSS 4.0" O.D. x 0.25" wall (50W material) and 4.5" O.D. x 0.315" wall tubing for the TirSmart post system.