2902 COLBY AVE 2021-11-02 - Laserfiche WebLink

Bella Elevator LLC 10000 North Galena Road RELLA Peoria,IL 61615 ELEVATOR Phone(309)689-8090 Fax(309)689-8091 October 2,2019 LULA FLOOR AND WALL LOADS EXPLANATION(Ref Skotdahl Job) The"net vertical load from the elevator system" is the static load composed of the gravity weights of all the components along with the capacity. This 3760 lb. load would be acting at the locations of the various centers of gravity of the components. In the case of the LULA, most of the static load is concentrated at the location of the hydraulic ram itself as that is where the load path of the cab, sling, and passenger load itself is directed. Relative to concentrated loads at specific locations, in a safety set condition you would have a high impact load at each area directly underneath each T-rail.The safety set force is the total force acting on both rails when the safeties would set, for example in a broken rope scenario. The safety-set impact loads include the rail safety set force along with the T-rail gravity weight to give a total floor load at an impact condition. Assuming equal load sharing between each T-rail, there would be approximately 4800 lb. of vertical impact loading at each T-rail which would transfer down to the bottom floor plate directly underneath each T-rail,for a total safety set vertical loading of 9600 lb. If buffer springs are required and utilized, there can be impact loads associated with buffer spring contact at the respective locations of the springs-approximately 3300 lb. at each 3-spring buffer plate, for a total vertical impact of 6600 lb. The Typical Rail Backing layout shows the plan view of where all of these load locations are positioned. In the lower right of the Typical Rail Backing layout, the image of the T-rail provides the values of the horizontal forces acting at the individual roller locations at each T-rail.The 498#load is the load at each roller location and its direction is either towards the backer wall or away from the backer wall. Since our car platform is a cantilever design, each of the two upper rollers is normally applying a 498 lb load on each respective T-rail acting away from the backer wall. Each of the two lower rollers is normally applying a 498 lb load on each respective T-rail acting towards the backer wall. These loads would be moving up and down the wall just as the elevator itself is doing the same. The reference vertical roller spacing is 92.06". Relative to the backer wall, usually the worst case for deflection is when the upper or lower rollers pass the midpoint of the span between supports. Note that the code requires a maximum wall deflection of only 1/8"from this static loading. Note also in a dynamic loading situation from a safety set condition, these 498 lb horizontal loads would increase by approximately 2.5 times, although the code maximum deflection criterion of 1/8" is not applicable in this dynamic loading. The 191 lb load acts perpendicular to the previous loads. This load represents the load on the upper and lower guides which would come from off center loading of the platform. Depending upon which direction the off center loading is taking place the load could be to the left or to the right. However if the top guide is loaded to the right, then the bottom guide will be loaded to the left, and vice versa, so that all the loading is balanced. Richard Reysen Engineering Department Bella Elevator riA R1