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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6750
Experience:  Structural Engineer
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I want to support a boat lift 3,000 pound boat;. The lift

Customer Question

I want to support a boat lift for a 3,000 pound boat;. The lift will be 10FT out from the pier and existing structure.
How thick does my pipe or beam need to be to support the 3,000#boat going up and down?
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 year ago.

Hello. I can help

Expert:  StructuralEng replied 1 year ago.

Does the pipe need to cantilever out 10'?

Customer: replied 1 year ago.
I'm sorry I am not sure what you mean by cantilever.
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  StructuralEng replied 1 year ago.

I submitted the phone call offer

Customer: replied 1 year ago.
This is in addition to $18 already paid?
Expert:  StructuralEng replied 1 year ago.

Correct for the phone call

Customer: replied 1 year ago.
We can do it this way. What is cantilever?
Here is a drawing of existing and new section we want to add to existing.
Expert:  StructuralEng replied 1 year ago.

That is a cantilever.

Expert:  StructuralEng replied 1 year ago.

You can plan for a HSS 10x6x3/8

Customer: replied 1 year ago.
OK. Sorry, what is HSS?
What load can it hold?
Do I need a support running from mast to this beam? How much more will it hold if I put a little support?
Can you give me yr email so I can maybe hire you to draw it up and advise on welding, etc.
Customer: replied 1 year ago.
What size support member should I use?
Expert:  StructuralEng replied 1 year ago.

That is the the 10' outrigger arm. HSS is a hollow rectangular steel tube

Expert:  StructuralEng replied 1 year ago.

I would like to limit this to one question. If you want the entire thin designed, including connections and sketches, I can submit an additional service offer for you.

Customer: replied 1 year ago.
ok
Expert:  StructuralEng replied 1 year ago.

Do you want me to submit the offer or limit this to the outrigger size?

Customer: replied 1 year ago.
Submit yr offer
Expert:  StructuralEng replied 1 year ago.

Which components and connections do you need designed

Customer: replied 1 year ago.
Connection to mast (existing structure) and outrigger
Support from mast to outrigger and connections (does this reduce the outrigger size at all?)
What is the safety factor?
Can you advise a round pipe size and I-beam/H-beam size that are substitutes for the HSS tubing?
Expert:  StructuralEng replied 1 year ago.

Can you add another post? It looked like the outrigger could be supported as a cantilever off the mast only

Customer: replied 1 year ago.
I don't want to add another post, if I can help it
Customer: replied 1 year ago.
but, there will be two outriggers
Customer: replied 1 year ago.
on a flat plate hoist that winds the wire on a pipe
Expert:  StructuralEng replied 1 year ago.

What is the mast made of? I can drain the connection to the mast, but you will need to ensure the mast can resist the very large moment resulting from the outrigger load

Customer: replied 1 year ago.
Mast is steel piling.
There are eight pilings holding the roof and dock. There is a 6,500# ***** on a flat plate hoist.
Here is a sideview of the two outriggers.
Expert:  StructuralEng replied 1 year ago.

Thank you. I will submit the offer now.

Please recognize, I can't do anything about the existing structure and can only design the connection to it. You have to verify it can take the load

Customer: replied 1 year ago.
I assume this is in addition to $18 already paid?
Customer: replied 1 year ago.
You will advise what load will be placed on the existing structure, correct?
Expert:  StructuralEng replied 1 year ago.

Yes, it's in addition. The load will be the 6,300 pounds you specified, increased by a lifting dynamic factor of 33%

Customer: replied 1 year ago.
Must have the load of the mast evaluated also, to verify the system can handle the load. Tks for your help.
Expert:  StructuralEng replied 1 year ago.

I can't possibly do that without knowing what it is or how's it's supported

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