Rigging 110101e Flashcards
A right lay rope has:
STRANDS twisted to the RIGHT , YARNS twisted to the LEFT.
The strongest synthetic fibre rope is:
Nylon
Safe working load is the:
breaking strength divided by the safety factor.
The type of knot or bend used for tying two ropes of different diameters together is the:
Sheet bend
A knot in a rope:
decreases the rope strength by 50%.
How is a fist grip clip different than a wire rope clip?
The fist grip clip has two identical components.
Why is a thimble used in an eye on a wire rope sling?
The thimble helps prevent premature wear of the slings eye.
How many wire rope clips are recommended to be applied to a 1” diameter wire rope to make an eye in the rope.
4
How is the lifting capacity of a synthetic fibre round sling identified?
by a colour-coded, non-loadbearing cover placed over the sling
When are shoulderless eyebolts used?
for vertical hoists only
The type of chain hoist most suitable for a horizontal pull is the:
Come-along
When two blocks are connected by rope, they become a machine, commonly known as a
Block and Tackle System
Why must a crane be set up as level as possible?
so the lifting capacity of the crane is not affected
What is used to increase a crane’s stability?
outriggers
A crane is capable of the heaviest lifts when its boom is very near to horizontal.
False
_____ is the bringing together of various lifting devices to raise or lower materials or equipment
Rigging
_____ ropes can be made from manila, sisal, coton or coir
Natural Fibre
Safety use and storage of rope:
Avoid overloading by following a safety factor of
5:1 or 10:1
_____ knot is used for hoisting safety lines and for hitching around posts and rings because it is easy to tie and untie
Bowline
_____ knot is used for tying two rope ends that are of equal diameter
Figure of Eight
_____ knot is used to shorten up excessively long ropes that may pose a tripping hazard if left alone.
Sheepshank
_____ are hardware components that are used to fasten loads to hoisting equipment for purpose of safety moving loads
Slings
_____ are made from carbon steel or stainless steel laid around an independent wire rope core.
Wire Rope Slings
Slings should not be used at angles less than
60 degrees
When a lift is required that involves a high probability of damage to building, equipment, or personnel if the rigging components were to fail, the safety factor must be increased to
10:1
_____ are used to lift loads in a straight-line vertical position.
Chain Hoists
_____ also known as Griphoist is a hand operated cable which that uses a draw vice design and permits unlimited wire rope travel
Tirfor winch
_____ is used to change the direction of pull on a wire rope.
Snatch Block
Crane and Hoist Signals:
One arm is waved back and forth perpendicular to signalman’s body.
Stop
Crane and Hoist Signals:
Both arms should be swept out from the body at shoulder height.
Emergency Stop
Crane and Hoist Signals:
The crook between the thumb and forefingers of each hand should be interlocked of the signaler.
Dog everything (stop all movements)
