Methods
Cribbing structures are often categorized by shape. Different shapes of cribbing structures are chosen depending on the area available and the point being cribbed to.
A box crib is the simplest, most stable and most common method of cribbing. It is constructed by arranging sets (2 or more) of matched blocks in a regular log-cabin style to form a rising square or rectangular frame. The more blocks on each level, the greater the number of support points and therefore the greater the strength of the crib tower.
A triangle or A' crib is similar to the box crib, except it resembles a triangular prism instead of rectangular.
A parallelogram crib resembles a diamond prism.
A 'tilted tower crib is a box crib in which pairs of shims are used to change the direction of the rising structure, resulting in a curve. Curving a crib must be done in moderation and is only advisable for structures at sharp angles to the ground.
Read more about this topic: Box Crib
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