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Spokes
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Posted: Sat Jun 14th, 2008 01:43 am |
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Escalator Calculation? Is this a code question? Where can we find more info on this? I realize it's only one question but it would be good to know. I would assume it's a simple calculation.
Thanks
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AbracaPocus
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Posted: Sat Jun 14th, 2008 03:27 am |
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| Read the chapters on vertical transportation in MEEB.
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Spokes
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Posted: Sat Jun 14th, 2008 05:23 am |
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| Perfect...got the book today. Thanks AbracaPocus
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Spokes
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Posted: Sat Jun 14th, 2008 05:40 am |
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Another link:
http://www.areforum.org/forums/view_topic.php?id=25148&forum_id=4&highlight=vertical+transportation
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archidg
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Posted: Tue Jun 17th, 2008 12:27 am |
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That attached pdf is great, thank you!
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mrdcon
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| Joined: | Sat Nov 19th, 2005 |
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Posted: Tue Jun 17th, 2008 01:51 am |
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Spokes wrote: Escalator Calculation? Is this a code question? Where can we find more info on this? I realize it's only one question but it would be good to know. I would assume it's a simple calculation.
Thanks
I had that question and guessed it. I study the MEEB chapter on vertical transprotation and don't remember anything in MEEB that would have helped me with that escalator question....... if it's the same one question.
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LibraLogic
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Posted: Tue Jun 17th, 2008 12:44 pm |
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| Any chance you could clarify the basis of the question? What area of "ESCALATORS" would one focus to prepare?
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mrdcon
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Posted: Tue Jun 17th, 2008 02:34 pm |
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| It had to do with the dimensions and angle of the escalator in relationship to landings and approaches to the escalator.
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LibraLogic
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Posted: Tue Jun 17th, 2008 02:44 pm |
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Ahh....thanks. Here I am memorizing speeds/wait times/ allowable occupant loads per width....etc. Of course angles were something skipped.
Thanks again.
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mrdcon
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Posted: Tue Jun 17th, 2008 02:53 pm |
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Let me say that in my case I didn't see anything that dealt with the issues that you listed, however, that's not to say they wouldn't show up. You never know what NCARB is going to throw at you.... 
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LibraLogic
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Posted: Tue Jun 17th, 2008 02:58 pm |
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Modern escalators are usually inclined at 30°, limited in rise to about 60 feet (18 m), with floor-to-floor rise of about 12 feet (3.5 m). They are electrically powered, driven by chain and sprocket, and held in the proper plane by two tracks. As the treads approach the landing, they pass through a comb device; a deflection switch is actuated to cut off power if an object becomes jammed between the tread and the comb.
Escalators move at a rate of up to 120 feet (36 m) per minute; larger types have a capacity of 6,000 passengers per hour. If a chain breaks, the release of tension stops the escalator. A safety switch also halts the device if a handrail is broken or comes loose or if a side panel is deflected.
Moving ramps or sidewalks, sometimes called travelators, are specialized forms of escalators developed to carry people and materials horizontally or along slight inclines. Ramps may have either solid or jointed treads or a continuous belt. Ramps can move at any angle of up to 15°; beyond this incline the slope becomes too steep and escalators are favoured.
From Brittanica Online.
Last edited on Tue Jun 17th, 2008 02:58 pm by LibraLogic
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mrdcon
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Posted: Tue Jun 17th, 2008 04:17 pm |
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WOW! Sounds like all you need to know on escalators! 
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Far Galaxy
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Posted: Tue Jun 17th, 2008 04:48 pm |
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adding:
7'min clearance underneath the escalators.
3 widths: 24", 32" and 40".
Threads are to be 16"wide, risers are to be 8" high.
Speed is from 90 to 125fpm. 100fpm is standard.
like that huh....
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BlewBe
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| Joined: | Tue Jul 31st, 2007 |
| Location: | ARC******, LEED AP, Kansas USA |
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Posted: Tue Jun 17th, 2008 09:24 pm |
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I dont know what the "calculation" question is for escalators ( I havent taken ME yet), but Ching illustrates the dimensional requirements of an escalator well on page 9.17.
Something interesting noted in Ching: the required total length of an escalator is 7'-6" (bottom landing) + 1.732 x Rise (length) + 8'-0" (top landing).
There isnt much that you can "calculate" for a stair or escalator, so I'm assuming that it must be something relating to tread length, riser height, total opening required. etc.
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