PCI releases safety advisory alert on erecting ramp double tees

摘要

In April 2014, while erecting a parking garage project, a double tee measuring 60 ft long × 12 ft wide and weighing approximately 60,000 lb slid off spot bearing haunches projecting from a litewall and fell from the third elevated ramp area to the ground below. This action caused two identical double tees located directly below it to also displace, resulting in all three double tees falling to the ground below. Two additional adjacent double tees, one on the second elevated level and the other on the first elevated level, were also damaged beyond repair. Following are the recommendations: When erecting double tees on a parking garage ramp from high ramp end to low ramp end where the low end does not have a secured double tee down-ramp adjacent to it, additional care must be taken to prevent the sloping tee from sliding off its bearings during construction. This applies not only to spot corbels on spandrels or walls, but also to continuous ledges.