Your browser does not support JavaScript! General: The lifting triangle has the same function as a short beam or a spreader. We use cookies on our website to optimize your user experience. DESIGN OF ADJUSTABLE SPREADER LIFTING BEAM of Standard Profile "HEB Series" Geometry of Lifting at the each end of the HOLLOW PIPE Spreader Beam, Solved using the equations of Static Equillibrium (A) STRENGTH DESIGN - Design for FLEXURAL Bending Stress **** Selecting the Section initially based on this **** (B) STIFFNESS DESIGN - Design for DEFLECTION (C) DESIGN OF ATTACHMENTS - (a) … The beam was designed to deal with compression, not bending. For top angles between 90°-120° working load limit shall be reduced by 30%. To draw this triangle, I drew side A first at a length of 5, and then drew out sides B and C from each end of side A until they met. A spreader, also known as a spread beam as shown in figure 5 can be considered a strut in pure compression and the line of action of the top of the sling and the load suspension point coincide at the neutral axis at the end of the spreader. The main issue is often interpretation and how people have been trained or come to hear about this type of equipment. This article aims to bridge the gap and give a detailed explanation, that is accessible to all. Now in the full diagram (figure 3), we can see that the force represented by the horizontal orange arrow is resisted by the same force created at the other end of the load. A simple one or two line answer that gives a definition but doesn’t explain how or why, or a more complex explanation that can be difficult to understand if you don’t have an in-depth engineering knowledge. As a specilist manufacture of below the hook lifting equipment based in the UK, Britlift offer a huge variety of lifting beam, lifting frame, spreader beam and spreader frame options and services. Univac® | As some of you may have guessed, in this example the broom is the spreader beam. Small Length with Bale Top Shorter length, triangle beam with a bale-style top is ideal for balancing and lifting smaller loads. In figure 4, side A is representative of the vertical force (vertical orange arrow in figure 2), side B is representative of the horizontal force (horizontal orange arrow in figure 2) and side C is representative of the angled force in the sling (blue arrow in figure 2). Terminology is the number one cause of confusion in regards to the differences between these beams. A lifting frame like that diagrammatically represented in figure 6 is in effect a combination of four spreaders. Whilst removable lifting accessories can be used for separate lifting applications, it’s good practice to keep them together as if forming an integral part of the lifting beam. Although this answers the question, there is still more information that the triangle can give us. Please include any images or drawings of the intended lifting operation to assist us in providing you with a accurate solution. Any beam where the load being lifted mainly puts a compressive stress in the beam will be referred to as a spreader beam. When the beam is only loaded at either end, and the top connection points are directly above the bottom ones, we have a spreader beam. Why Caldwell | Rockford, IL 61109 | So we know the force in the sling is more than 5 tonnes, but is it more than 6.5 tonnes (the capacity of the shackle and sling mentioned in the question)? They are the horizontal and vertical components of the blue arrow and the stronger the pull on the sling, the larger both of these forces will get. Container lifting beams are also known simply as bulk container beams by others in the industry such as Caldwell lifting beams and Grainger. Please check the Privacy Policy, Unique Group Signs Global Agreement with Britlift, How Centre of Gravity Affects a Lift (In Simple Terms! Unless the orange arrows (forces passing into the load) are resisted, the load will move in that direction. See all SAFETY HARNESSES AND FALL PROTECTIONS. The requirements of the individual sections of those code apply whether these items are readily removable from the beam or not. Should the pull in the sling be sufficient, the vertical force will equal the opposing force created by gravity and the mass of the load – and the load will be lifted into the air. Caldwell introduces our short span lifting beams! © We have seen a number of manufacturers in different industries that do not always use best practices or equipment for their lifting operations, and most of the time it is a lack of knowledge only rather than the cutting of corners. While I commend the above article it would shock me to think any one involved in lifting did not have a full understanding of the forces involved prior to lifting. The LEEA definition is that the term ‘Lifting Beam’ normally refers to a beam which is suspended by a single central point and supports a load via two or more connection points – the beam is loaded in bending. I have expressed his question as the problem below and included a diagram to make things clearer: Question: Load A has a central centre of gravity and weighs 10 tonnes. Toll Free: 800-628-4263 | Fax: 815-229-5686 | The balance of these forces is crucial to the stability of the load when it is in the air. In my next article, I will show some photographic evidence of recent examples of misuse and discuss what steps can be taken to help avoid such incidents.