 Previous Page 310.1/ 51A
|
Rigging
Hardware
Background Rigging hardware is the name given to the hardware needed to lift, move, or hold equipment. This hardware is essential and should be taken care of properly. You will need a working knowledge and vocabulary of this hardware.
Lashing wire Lashing wire is a piece of wire rope, usually 20 or 30 feet long, with the ends braided to prevent the wire from unraveling. Lashing wire is usually 3/8 or 1/2 inch in diameter. It is wrapped around an object to form handling gear when none is provided. The ends of the wire are secured together with wire rope clips. Wire rope clips, when installed correctly, have an efficiency rating of approximately 80 percent of the rope strength.
|
Click on image to enlarge. Rigging Hardware |
|
| Shackles Two types of shackles are commonly used in rigging: the anchor, or "bow," shackle and the chain, or "D," shackle. Each type of shackle is available with screw or round pins. Like most other rigging hardware, shackles are sized by the diameter of the steel in the bow section rather than the pin size. They should be made of forged alloy steel. Observe the following safety guidelines when using shackles.
|
Click on image to
enlarge. Two Types of Shackles
|
||
| NEVER replace the
shackle pin with a bolt; only the proper fitted pin should be used. Bolts are NOT intended
to take the bending that is normally applied to the pin. NEVER use a shackle if the distance between the eyes is greater than listed in the specification. All pins must be straight and all screw pins must be completely seated. Cotter pins must be used with all round pin shackles.
|
Click on image to
enlarge. Replace a Shackle Pin
|
||
| Shackles worn in
the crown or the pin by more than 10 percent of the original diameter should be destroyed.
|
Click
on image to enlarge. Shackle Worn Areas |
||
| NEVER allow a
shackle to be pulled at an angle because the capacity will be tremendously reduced.
Centralize whatever is being hoisted on the pin by suitable washers or spacers.
|
Click on image to
enlarge. Proper and Improper Shackle Angles
|
||
| Do NOT use screw
pin shackles if the pin can roll under load and unscrew. The shackle working loads table provides the rated safe working loads of shackles. Lifting pads The standard-size lifting pad has a capacity of 5,000 pounds, although lifting pads of other capacities are available. When lifting pads are installed, be sure to locate the pad so the long axis of the pad is parallel to the direction of the drift. Locate pads over stiffeners or supporting structures when possible. When this is not possible, additional supports must be installed. After the pad is installed, ensure that there is a continuous weld completely around the pad. When using an existing pad, be sure to check the pad weld for cracks, bending, or other damage. |
Click
on image to enlarge. Shackle Pin Rolling Under Load
|
||
Beam clamps  |
