ASME B30.11-2004 pdf download.Monorails and Underhung Cranes.
SECTION 11-1.3 GENERAL CONSTRUCTION 11-1.3.1 Crane Runways and Monorail Tracks (a) Crane runways, monorails, and supporting struc- tures shall be designed to withstand the loads and forces imposed by the cranes and carriers. (b) The structure shall be free from detrimental vibra- tions under normal operating conditions. (c) Track sections shall be installed with splices to ensure proper alignment of the surface and sides of the load-carrying flange. (d) Runway tracks shall be spaced to be compatible with the span and design of the crane. (e) Where curves are required, special design will be necessary. (f) Where change in elevation of the track is required, special design will be necessary. (g) Stops shall be provided at the ends of the carrier or crane travel to prevent the carrier or crane from inad- vertently coming off the track or contacting an obstruc- tion. Stops shall be provided at open ends of tracks, such as at interlocking crossovers, track spurs, track openers, and track switches. Stops shall resist impact forces of a fully loaded carrier or crane traveling at 50% of the rated full-load speed.
11-1.3.2 Track Supports (a) Crane runways or monorail tracks shall be fas- tened to a supporting structure. (b) All clamps, hanger rods, bolts, or other suspension fittings and supporting structures shall be designed to withstand the loads and forces imposed by the cranes or carriers. Hanger rods shall be installed plumb within the manufacturer’s tolerances. (c) Where multiple hanger rods are used at a suspen- sion point, consideration should be given to the unequal load induced in the rods. (d) Means shall be provided to restrain the track against damaging lateral and longitudinal movement. (e) Where the track is suspended from hanger rod assemblies, restraining means shall be provided to pre- vent the hanger rod nuts from backing off the hanger rods.
SECTION 11-1.4 TRACK SWITCHES, TRACK OPENERS, AND INTERLOCKS 11-1.4.1 Track Switches (a) All track switches shall be constructed and installed to maintain alignment with incoming and out- going tracks. Control chains or ropes for hand-operated track switches, push buttons for electrically operated track switches, and operator-controlled valves for pneu- matic or hydraulically operated track switches shall be located within reach of the operator. (b) Stops shall be provided as an integral part of the switch to protect the end of an incoming track when the switch track is not aligned with the incoming track. (c) Track switches should not be shifted with a carrier onthemovable track. Means shallbeprovided to prevent a carrier on the movable track from running off the movable track when it is not aligned with an outgo- ing track.ASME B30.11 pdf download.