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PostPosted: Wed Feb 07, 2018 12:29 pm 
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Hey all,

After significant searching here and google I have come up blank so turning to you all for some advice.

I am attempting to build a cuboidal frame that will have a central beam sufficient to support 150kg from its centre. I dont have sufficient support overhead to support this weight, hence the frame. The dimensions are 2.4m tall and wide and 3m long.

My idea is to use 4"x4" uprights at each corner and horizontally to create the cuboid and at the centre point of the 3m beams as support for the beam to hang the bag on where I hope to use a 5"x4" thats runs across the width.

My question is with regard to joints and brackets/joist hangers. How do I join the 3 4x4 posts that will meet at each 90°corner and how do I join the 4x4 posts with the 5x4? Im intending to use joist hangers/brackets but unsure of configerations etc

Cheers
Aj


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PostPosted: Wed Feb 07, 2018 2:20 pm 
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heeelllooo and welcome aj3237 :welcome: :welcome: :welcome:
are we talking dead load or live load 150kg may be the dead load but iff you kick thump or jump on somthing it can triple or quadruple the load and put forces in different directions

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PostPosted: Wed Feb 07, 2018 3:01 pm 
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:welcomeuhm:
As BA says there's going to be some load on it if you do anything other than have it hanging there.
I'd want substantial steel brackets bolted through to support that sort of thing on a frame.
Decent timber too.
Try searching for "post and beam" bracket.
As with anything "special" though you may either have to make something or get it made up.


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PostPosted: Wed Feb 07, 2018 3:16 pm 
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Thanks for the replies.

It is going to be a live load. The punching and kicking is going to cause the bag to move. The bag at a dead hang weighs a little over 120kg I think but for safetys sake im calling 150kg but im not sure how to factor in the movement etc but it will significantly increase the load.

I have searched for post connectors etc but cant seem to find any one suitable and im wondering if it is possible to overlay a number of connectors?


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PostPosted: Wed Feb 07, 2018 5:37 pm 
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Are you a kidnapper? :lol:

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PostPosted: Wed Feb 07, 2018 8:40 pm 
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Because the load is dynamic I think it might be better to incorporate some form of open tenon or bridle joint where timbers meet and to secure them further using by means of coach bolts and Nyloc nuts which could be tightened periodically

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PostPosted: Fri Feb 09, 2018 8:48 am 
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I had considered a bridle joint although that will only work for two beams meeting, not the 4 that will be in the centre. I considered a bridle joint for the main bag support beam, heavily bracketed and joist hangers for the lateral connections? All reinforced of course


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PostPosted: Fri Feb 09, 2018 8:53 am 
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Mortise and tenon joints to connect the uprights to the base and head thus forming two side frames. Then through tenons with wedges attached to the heads of those frames to which the load is then attached. Makes it rigid but at the same time easy to dismantle and move.


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