[RIGGER’S CORNER]
BULL RIGGING: WHAT IS THAT?
BY RICHARD MARCOTTE, INSTRUCTOR & CONSULTANT, ITI
What in the world is Bull Rigging? Tose of us not familiar with the term might be picturing grabbing a hold of a rigging configuration by the shackle and hanging on for an eight second ride. As fun as that sounds, it is not Bull Rigging. In short, Bull Rigging is the term used to describe a method or system of rigging commonly used where a crane (mobile/ overhead) cannot gain access. Bull Rigging is often referred to as drifting, “tarzaning,” or just simply hand rigging. It is often used in concert with other rigging activities such as transferring a load from a structure to a crane hook or vice-versa.
Te equipment most likely used in Bull Rigging include: • Chain Falls
• Come-a-longs or Lever Hoists • Rollers/Casters/Skates • Jacks (mechanical or hydraulic) • Winches • Rigging Blocks
Te planning and application of using chain hoists and other similar devices to drift loads (moving horizontally while being suspended), skidding/skating loads (pulling a load horizontally on rollers or other equipment), or building a winch and block system to aid with either, takes great skill and careful considerations regarding the forces that we create when building rigging systems. Okay, so exactly what does it take to be a Bull Rigger? To start, an excellent knowledge base of equipment uses and applications, along with a pre-use inspection is a must! In addition, an understanding of the theory behind these unique load handling challenges make for an effective, and most importantly, a skilled Bull Rigger. Te theoretical understanding should focus on these six points:
1. Load weight estimation.
2. Discovering the center of gravity (C/G) and its effect on the load.
3. Finding load weight distribution and identify the share of the weight.
80 NOVEMBER–DECEMBER 2017 WIRE ROPE EXCHANGE
4. Understanding tension when working with angles as well as level or off level pick points and respect the influences it has not only upon the rigging but also the supporting structure.
5. Determining the force required to pull a load up an incline plan or hold a load back when lowering.
6. Calculating mechanical advantage as well as associated block loading and frictional gain in a multi-part winch/ block system. To build your skills as a Bull Rigger, visit
http://www.iti. com/bull-rigging-with-chain-hoists to learn more and register for upcoming open enrollment courses. If you have further questions, please direct them to
info@iti.com. y
Since 1986, ITI has specialized in crane, rigging, and lift planning training. Learn more at
iti.com.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84
