Articles

Rigging (9)

  1. A Good Rigger's Skill Set
  2. A Rigger's Values
  3. Becoming a Rigger
  4. Qualifications & Licensing
  5. Rigging Associations
  6. Salary Profile of a Rigger
  7. What a Rigger Does
  8. What a Successful Rigger Knows
  9. What is a Rigger?

Tips & Advice (7)

  1. House Movers Depend on Heavy Load Moving Equipment
  2. Keeping Up with Federal Regulations
  3. Keeping Your Small Rigging Business Afloat - Part 1
  4. Keeping Your Small Rigging Business Afloat - Part 2
  5. Specialized Insurance
  6. Successfully Completing a Rigger Job Application
  7. Tips for Choosing a Rigger

Trends (4)

  1. Becoming an API Qualified Rigger
  2. Helicopter Rigging & Lifts
  3. Market Opportunity? Bakken Formation
  4. Understanding Rigging Design Factors

Safety (10)

  1. Critical Lift
  2. Estimating the Capacity of Chains & Hooks
  3. Evaluating Your Load's Weight
  4. Lifting People Safely
  5. Non-Critical Lift
  6. Rigging in the Aftermath of a Natural Disaster
  7. The Dangers of Shock Forces
  8. The Problem of Moving a Load with 4 Skates
  9. Who Sets the Standards for Safety?
  10. Why Does a Rigger Need Insurance?

How it Works(13)

  1. Center of Gravity
  2. Chain Slings
  3. Gravity & Rigging
  4. Hand Signals
  5. How It Works: Mobile Cranes
  6. How It Works: Stationary Cranes
  7. Lift Planning
  8. Nylon for Slings
  9. Rotational Resistant Wire Rope
  10. Spreader Bars
  11. Synthetic Rope
  12. Understanding Hydraulic Cylinders Part 1 - Single & Double Acting
  13. Which Sling is Right for the Job?

Spreader Bars

What Are Spreader Bars?
Spreader bars, often called spreader beams or lifting beams, are horizontal structural members that are used to provide expanded versatility while hoisting loads.

Figure A below is a sketch of a typical spreader bar.

spreaderbarsa

How Are Spreader Bars Used?
Spreader bars are used in several different ways. The basic arrangement is that shown in Figure A. This allows for two attachment points on the load. This is safer than a single pick point because the stress is divided between the two hoisting ropes. By providing a direct upward hoist, often times this lifting arrangement avoids the need for an angled pull. An opposite configuration is that shown in Figure B which is simply the basic arrangement flipped vertically. Not commonly used, the Figure B arrangement might be appropriate in a situation where two cranes are being used to lift a common load.

spreaderbarsb

Figure C below shows a specialized spreader bar being used to lift an irregularly shaped load. Figure D shows a spreader bar being used to create multiple pick points for a load that might be extremely flexible. These examples illustrate the usefulness of spreader bars.

spreaderbarsc

spreaderbarsd

How Are Spreader Bars Fabricated?
Aside from the already mentioned steel beam sections, the horizontal beam itself can be fabricated from hollow structural shapes, or even from pipe. Figure E below shows these other cross sections.

spreaderbarse