Bolting Deck to Trailer

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Bolting Deck to Trailer

Postby greenchicken » Tue Dec 25, 2018 1:51 pm

The Deck is done and today I will bolt it to the trailer.

I want to be be removable if necessary...aka not a permanent mounting.

I was planning to use 3 bolt on each side, through the deck and through the holes already in the trailer frame.

Do you feel that is enough? I could add 2 more in front and back it recommended.
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Re: Bolting Deck to Trailer

Postby GTS225 » Tue Dec 25, 2018 6:14 pm

I think you should ad the extras. Even a pickup box is held on with 8 bolts, and that trailer will probably bounce around a bit more then the TV's backside.

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Re: Bolting Deck to Trailer

Postby noseoil » Wed Dec 26, 2018 8:11 am

Look at Nucor's fastener shear schedule (single shear application) for the size of the bolts you have & will use. A grade #2 1/4" bolt in single shear is 2100#, so 6 of them would be about 12000# of shear force to cut them off. Go to 5/16" bolts & it changes to 3400# each, or a combined total of 20,000# of force to shear the cabin from the frame.

6 bolts should be more than enough, even with 1/4" fasteners. I guess you could use a single 1/2" bolt in the middle & be perfectly safe, other than the trailer winding up a bit on turns. :thinking:
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Re: Bolting Deck to Trailer

Postby Tomterrific » Wed Dec 26, 2018 8:30 am

The minimum would be 4 bolts at each corner to keep the frame from racking. This effectively X's the square of the frame and triaglates it. I'll suggest bolts on each cross member also.

Tip: If you use carriage bolts, find a hardware store with fang washers and use those with the bolts. The washers will keep the bolt from turning when you attempt to remove the nut.

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Re: Bolting Deck to Trailer

Postby tony.latham » Wed Dec 26, 2018 10:34 am

noseoil wrote:Look at Nucor's fastener shear schedule (single shear application) for the size of the bolts you have & will use. A grade #2 1/4" bolt in single shear is 2100#, so 6 of them would be about 12000# of shear force to cut them off. Go to 5/16" bolts & it changes to 3400# each, or a combined total of 20,000# of force to shear the cabin from the frame.

6 bolts should be more than enough, even with 1/4" fasteners. I guess you could use a single 1/2" bolt in the middle & be perfectly safe, other than the trailer winding up a bit on turns. :thinking:


It's tough to argue against data like that.

:thumbsup:

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Re: Bolting Deck to Trailer

Postby aggie79 » Wed Dec 26, 2018 12:48 pm

tony.latham wrote:
noseoil wrote:Look at Nucor's fastener shear schedule (single shear application) for the size of the bolts you have & will use. A grade #2 1/4" bolt in single shear is 2100#, so 6 of them would be about 12000# of shear force to cut them off. Go to 5/16" bolts & it changes to 3400# each, or a combined total of 20,000# of force to shear the cabin from the frame.

6 bolts should be more than enough, even with 1/4" fasteners. I guess you could use a single 1/2" bolt in the middle & be perfectly safe, other than the trailer winding up a bit on turns. :thinking:


It's tough to argue against data like that.

:thumbsup:

Tony


Keep in mind that your draw bar is connected to the receiver with a single 5/8" diameter hitch pin for a 2" square receiver. For a 1-1/4" square receiver, the hitch pin diameter is 1/2".

Assuming the same steel characteristics, the shear force to shear a 5/8" hitch pin is approximately equivalent to 6 - 1/4" bolts or 4 - 5/16" bolts.

Not that it will ever come to this, but what are you designing to shear first - the draw bar separating from the receiver or the teardrop cabin from the teardrop trailer frame?
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Re: Bolting Deck to Trailer

Postby working on it » Wed Dec 26, 2018 8:03 pm

GTS225 wrote:I think you should add the extras. Even a pickup box is held on with 8 bolts, and that trailer will probably bounce around a bit more then the TV's backside.
I believe in overkill, when securing/fastening items. When I installed my two-layered (1/2" birch plywood + 1/4" luan plywood) as my deck on the 4x8 TTT, I went overboard with bolts/screws adhesives.

After gluing the the 4x8 birch ply to the tubular steel perimeter frame (and the interior crossmembers, too) with a 3/8" bead of PL Premium adhesive, it was bolted to the 11 gauge angle crossmembers (from the original 50"x 60" frame), using eight 3/8" carriage bolts, stainless fender washers, and nylock nuts. Then, after using TB2 to adhere the luan top sheet to the birch ply, I used thirty-eight #7-18 PBH Tek screws to secure the outer perimeter of deck to the tubular steel frame (also 11 gauge).

As far as shear strength goes, for the fasteners/adhesive (not counting the TB2), I came up with these figures, just for fun, but probably not accurate as to proper strain calculations (never got my engineering degree): possibly 95468 lbs of accumulated holding power, when added together.

A) 38" of PL Premium (in a 3/8" bead size- a full tube was consumed) used for the wood-frame primary set-up @ 590 psi tensile/shear strength (per inch?) equals 22420 lbs
holding power.
B) eight 3/8" grade 2 carriage bolts in single shear @4903.5 psi equals 39228 lbs holding power.
C) thirty-eight #7-18 PBH "Tek" screws thru 3/4" of plywood into 11 gauge steel @ 890 psi (single shear) equals 33820 lbs holding power.

Overkill for sure, but why take chances? I'm sure these are not cumulative in effect, but anyway it shows structural cohesion ample enough, for any forseeable travels.
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Re: Bolting Deck to Trailer

Postby 2bits » Fri Dec 28, 2018 10:03 am

I just used four carriage bolts and big washers underneath to spread the load on my 5x10. It's been cruising the USA for 10 years now.
Thomas

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Re: Bolting Deck to Trailer

Postby Sparksalot » Fri Dec 28, 2018 10:57 am

I went overkill, but literally had a bucket of bolts laying about. Rose has 13.
Holy cow, Rose is a teenager now! Done? Surely you jest. A teardrop is never "done".

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