A-Frame
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An A-frame is a basic structure designed to bear a load in a lightweight structure. The triangular shape gives good stability and structural strength.
Method
The basic A-frame is:
- Two poles or staves of equal length form the A-frame legs,
- Arranged as an acute angle,
- Too close and it is less stable, too wide and you don't get the height.
- Tied at the apex with a square lashing, like an uppercase letter 'A'.
- This could also be a shear lashing - that is then pulled open.
- A square lashing is used to attach the cross beam to each leg to make a stable structure.
Tips & tricks
- Make sure the two uprights are about the same length and ideally the same thickness.
- Put the thinner end of the pole at the apex (top) of the A-Frame.
- A good robust A-frame needs TIGHT square lashings.
Some pictures from other websites
Used in these pioneering projects
- Roman Ballista
- Single-A-frame-bridge
- Monkey bridge
- Camp table (can also be built with a tripod)
- Camp gadget - wash basin
- Camel - great for building patrol cooperation
- Sedan chair
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