Knots & Lashings
2 1/2 Hitches |
Clove Hitch |
Timber Hitch |
Sheet Bend |
Lark Head |
Square Lashing |
Diagonal Lashing |
Tripod Lashing |
Shear Lashing |
Round lashing |
Japanese Square |
boy scout lashings
Step by step:
To bind three poles together, for the construction of a tripod. To bind three poles together that contact at the same point in a structure.
The tripod lashing is a shear lashing that binds three poles together at the same point. The tripod lashing gets it name from the fact that its most common use is the construction of a tripod. The tripod lashing can be used just about any where in a structure that three poles cross each other at the same point and the same time in the sequence of construction. Tripod lashing takes two main forms; with racked wrapping turns (the rope is woven between the poles) and with plain wrapping turns (the rope is wrapped around the poles without weaving the rope between the poles). When the lashing is made with racking turns the rope contacts each pole around its entire circumference ; this contact makes the tripod lashing with racking turns the most secure form of tripod lashing: therefore tripod lashing with racking turns should be used when safety is important. However, for light structures where there would be no danger if the lashing slipped, the faster to tie tripod lashing with plain wrapping turns may be used.
Laying Out The Poles
For most tripod lashings, lay the pole side by side with the butt ends aligned. The alignment of the butts of the pole insures that the tripod legs are the desired length
The practice of laying the center pole in the opposite direction to the outside poles creates several problems. When the poles are laid in opposite directions the wrappings must be put on loosely so that when the center pole is rotated to its proper position the lashing is tightened around the poles. If the wrappings are put on too tight, the rope is stretched causing damage to the rope fibers, therefore weakening the lashing. On the other hand, if the rope is wrapped two loosely, the lashing will not tighten enough when the center pole is rotated and the lashing will be able to slip along the length of the pole. Either way, the rope to loose or the rope too tight, a dangerous situation is created.
Setting Up A Tripod
Set up the tripod by crossing the outside poles so that the cross point of the poles is under the center pole. Crossing the outside poles under the center pole causes part of the load that is placed on the tripod to be taken up by the wood to wood contact of the poles.
- Use to attach a rope to a pole, this knot provide a quick and secure result. It rarely jams, and can in fact suffer from the hitch unrolling under tension if the pole can turn. Often used to start and finish lashings.
- With practice, this can be easily tied with one hand - especially useful for sailors!
- Tip. If you are in a situation where the clove hitch may unroll, add a couple of half hitches with the running end to the standing end of the knot, turning it into a "Clove Hitch and Two Half Hitches"!
- Tip. When pioneering, use the Round turn and two half hitches to start and finish your lashings instead of the Clove Hitch. It won't unroll, and is easier to finish tying off. It just does not look so neat!