Laserfiche WebLink
Round 1 Bowling and Amusement 12/09/2024 Paradigm Design <br />Main Place Mall Expansion Grand Rapids, MI <br />Santa Ana, California <br />Project #2309147GR <br />2.4 RESTRAINED ELASTOMERIC ISOLATION MOUNTS <br />A.Restrained Elastomeric Isolation Mounts: <br />1.Description: All-directional isolator with seismic restraints containing two separate and <br />opposing elastomeric elements that prevent central threaded element and attachment <br />hardware from contacting the housing during normal operation. <br />a.Housing: Cast-ductile iron or welded steel. <br />b.Elastomeric Material: Molded, oil-resistant rubber, neoprene, or other elastomeric <br />material. <br />2.5 OPEN-SPRING ISOLATORS <br />A.Freestanding, Laterally Stable, Open-Spring Isolators: <br />1.Outside Spring Diameter: Not less than 80 percent of the compressed height of the spring <br />at rated load. <br />2.Minimum Additional Travel: 50 percent of the required deflection at rated load. <br />3.Lateral Stiffness: More than 80 percent of rated vertical stiffness. <br />4.Overload Capacity: Support 200 percent of rated load, fully compressed, without <br />deformation or failure. <br />5.Baseplates: Factory-drilled steel plate for bolting to structure with an elastomeric isolator <br />pad attached to the underside. Baseplates shall limit floor load to 500 psig. <br />6.Top Plate and Adjustment Bolt: Threaded top plate with adjustment bolt and cap screw to <br />fasten and level equipment. <br />2.6 HOUSED-SPRING ISOLATORS <br />A.Freestanding, Laterally Stable, Open-Spring Isolators in Two-Part Telescoping Housing: <br />1.Outside Spring Diameter: Not less than 80 percent of the compressed height of the spring <br />at rated load. <br />2.Minimum Additional Travel: 50 percent of the required deflection at rated load. <br />3.Lateral Stiffness: More than 80 percent of rated vertical stiffness. <br />4.Overload Capacity: Support 200 percent of rated load, fully compressed, without <br />deformation or failure. <br />5.Two-Part Telescoping Housing: A steel top and bottom frame separated by an <br />elastomeric material and enclosing the spring isolators. <br />a.Drilled base housing for bolting to structure with an elastomeric isolator pad <br />attached to the underside. Bases shall limit floor load to 500 psig. <br />2.7 RESTRAINED-SPRING ISOLATORS <br />A.Freestanding, Laterally Stable, Open-Spring Isolators with Vertical-Limit Stop Restraint: <br />1.Housing: Steel housing with vertical-limit stops to prevent spring extension due to weight <br />being removed.