A-Frame

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

• ukscouting.org.uk
• You-tube

The A-Frame is similar to the A-trestle shown here.

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