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Author Topic: Any architectual engineers out there?  (Read 278 times)

Offline Modas

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Any architectual engineers out there?
« on: October 28, 2004, 09:17:18 AM »
Hi guys -

I'm curious if there are any archies out there...

I want to put an overhead hoist in my shop, but I want to hang the hoist/track from my rafters.  However, I have no idea what type of load they can handle.

If I drew up a design for what the rafters look like and how I want to attach the overhead hoist, would it be a big deal to determine the load limit?  I don't plan on going over 1300 lbs...

I'm sure you AE's have programs that do that....  Any help is appreciated....
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Offline gunnss

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Any architectual engineers out there?
« Reply #1 on: October 28, 2004, 12:10:53 PM »
<--- not an enginer, But we did somthing similar in our Pump house at my FAA facility, and the hoist and rail need supports proportional to your projected load.  If your ceiling joists are 2x6 or less I seriously doubt that you can SAFLY lift any real load.  However you can do what we finally did, put a rail in and mount the hoist on the rail.  Of course some kind of support for the rail is essential.  ours was an "A" frame constructed of the same Rail at each end of the rail.  Also you need to make provision for the power supply to the hoist.  SOOO give us some details.... and the real Engeniers might be able to help you.

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Offline Maniac

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Re: Any architectual engineers out there?
« Reply #2 on: October 28, 2004, 12:14:18 PM »
Quote
Originally posted by Modas
Hi guys -

I'm curious if there are any archies out there...

I want to put an overhead hoist in my shop, but I want to hang the hoist/track from my rafters.  However, I have no idea what type of load they can handle.

If I drew up a design for what the rafters look like and how I want to attach the overhead hoist, would it be a big deal to determine the load limit?  I don't plan on going over 1300 lbs...

I'm sure you AE's have programs that do that....  Any help is appreciated....


Superglue will do it.
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Offline john9001

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Any architectual engineers out there?
« Reply #3 on: October 28, 2004, 01:04:21 PM »
what are you going to lift? if it's a engine and tranny you can use a wheeled hydraulic crane (cherry picker), for bigger stuff get a wheeled a-frame with a chain hoist, the wheels give you more flexibility in movement.
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Offline Modas

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« Reply #4 on: October 28, 2004, 01:09:26 PM »
I've given up on the hoist/rafter idea.  After additional research, I don't think my roof system will hold any significant weight without safety issues.

I think I'm going to fabricate an a-frame/i-beam system.  Safer, and probably in the end easier.

I was planning on lifing all the various parts that I take off my restroation project and lifting them into my loft.  Probably the heaviest component will be the rear end
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Offline DREDIOCK

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« Reply #5 on: October 28, 2004, 02:18:19 PM »
Quote
Originally posted by Modas
I've given up on the hoist/rafter idea.  After additional research, I don't think my roof system will hold any significant weight without safety issues.

I think I'm going to fabricate an a-frame/i-beam system.  Safer, and probably in the end easier.

I was planning on lifing all the various parts that I take off my restroation project and lifting them into my loft.  Probably the heaviest component will be the rear end


Not an engineer but by putting them up in your loft wont you still be putting the same amount of strain on the rafters?
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Offline Waffle

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Any architectual engineers out there?
« Reply #6 on: October 28, 2004, 02:35:04 PM »
I fly PA systems and could give you an eyeball if you have a pic of the construction / materials. Is it steel or wood? what size?, ect...


http://www.atm-fly-ware.com/flyhome.html
(look for acesssories at bottom)

You'll need some of this stuff if you're doing any significant lifting -

a few smaller shackles and some of the fiber rope are good for lifting "odd" shaped items, as well as ones that you don't want to get damaged, ie paint damage, ect...

You can pick up a one ton chain hoist fairly cheap - operated by hand. If you decide to go really crazy, you can get a motorized chain hoist.
« Last Edit: October 28, 2004, 02:42:04 PM by Waffle »
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Offline Modas

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« Reply #7 on: October 28, 2004, 03:15:19 PM »
Quote
Originally posted by DREDIOCK
Not an engineer but by putting them up in your loft wont you still be putting the same amount of strain on the rafters?


No, the loft is actually supported by the walls/foundation.  I built the loft using 14" engineering joists.

Harbor Freight has a 1 ton gantry crane for about 550.  Not sure I can even manufacture one for that price...  That is probably the route I'm gonna go.  Gotta love harbor freight :D
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Offline RTStuka

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« Reply #8 on: October 28, 2004, 03:25:52 PM »
Your biggest issue is going to be how much weight you are lifting up, Rafters and Trusses are not designed to hold loads hanging from them, but they usually hold quite a bit of weight. There are alot of programs for the computer that will design them for you but again it will be focusing on forces other than what you will be putting on them. The material used also makes a difference because they react differently too stress which im sure you already know.
I would say your best bet is too go too your local lumber yard, tell them you would like to get specs on some rafters, when they ask what weight you will be applying just use the weight you will be lifting. Then when they give you an idea of what you need just go a bit bigger and beef it up.
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Offline lasersailor184

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« Reply #9 on: October 28, 2004, 06:13:13 PM »
I just happen to be studying Architectural Engineering at penn state...


But we haven't gotten that far yet...



But through what I've done in construction, my question is not "What type of beam?" but what will you be attaching this beam to?  A chain is only as strong as it's weakest link.  You can put a 5k dollar metal beam up, but if it's ontop of rotted wood it's not going to help.  (that's not a joke either, i've seen it happen).
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Offline RTStuka

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« Reply #10 on: October 28, 2004, 07:26:52 PM »
Quote
Originally posted by lasersailor184
I just happen to be studying Architectural Engineering at penn state...



One of my professorswhere I went to college for Architectural Engineering graduated from the Architecture program at Penn State.
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Offline DREDIOCK

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« Reply #11 on: October 28, 2004, 08:10:49 PM »
Quote
Originally posted by lasersailor184
I just happen to be studying Architectural Engineering at penn state...

 


A word to the wise. when you design your first office building.

ALL FLAT ROOFS LEAK

I have yet to see an office building with a flat roof that didnt leak And I cant for the life of me figure out why they keep designing them that way other then to keep other people in buisness fixing them. over and over and over again
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Offline lasersailor184

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« Reply #12 on: October 28, 2004, 08:27:40 PM »
Don't confuse Architects and Architectural Engineers.

Architects make something that looks good

AE's make something that looks good and can physically exist in this realm.
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Offline Torque

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« Reply #13 on: October 28, 2004, 08:44:16 PM »
Things you should mention,

The longest and shortest spans of which you have to work from.

Heck, if it's a small garage with a simple gable roof you can just beef up the gable ends and throw in a laminated beam from front to back.

Those 14" sleeper joists over a 12' span are springy as all hell, i dunno how they pass codes, but they do.
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Offline Lizking

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« Reply #14 on: October 28, 2004, 08:54:49 PM »
Flat roofs don't leak, so long as they are built in areas where it doesn't rain.
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