With the rapid development of economy, lifting operations in the economic construction of the brother areas are increasingly frequent and ordinary. In response to this trend, some lifting equipment and rigging manufacturing enterprises to seize the market, improve the lifting equipment and lifting of the performance and technical content, have research and development of different specifications of the new lifting equipment and rigging, lifting some goods have formed annotation and series.
The lifting sling, rigging and common end parts, some of what kind of method.
In 1, according to industry practices, we have used for lifting the lifting operation of rigid fetching device called the spreader, such as: hook, grab, clamp, chuck, such as special spreader;
In 2, to tie the workpiece flexible tool called the rigging, such as: wire rope, chain, synthetic fiber lifting belt;
In 3, end parts are commonly used the rings, shackle, rope card.
Drop weight lifting accident, is one of the important combat injuries, including a weight scattered caused two injuries. A variety of reasons caused the fall of improper use of heavy sling, binding is not strong, hooking and unhooking, chuck suddenly switched off, the lifting of the rule application, to improve the equipment itself and the operation process of security and reliability, improves the work efficiency will play a great role. At the same time, the lifting operation process and characteristics of the decision and the lifting operation is a highly dangerous special operations. Because of working personnel in the use of the sling inspection is not standard and improper use, often leading to accidents, this case also can be too numerous to enumerate. So to speak: a lifting sling is small, but important, we should not regard as unimportant.
On the hoisting accident statistics and analysis show that, because of the workpiece on the hanging position of choice is incorrect, the lifting of the selection, improper use of hoisting accident occupy a large proportion, especially the lifting of some large parts, due to division of cable hook staff itself technology quality is low or not responsible a strong, often leading to accident, and cause great economic losses. If a unit linked to personnel in the use of 2φ43.5mm wire rope double pocket lifting 3 stacked volume of about 72 tons of steel, because the diameter of the rope choose too small overload hoisting, and the edges without lining protection, when the plate up to about 2.5 meters in height, in the corner of wire rope fracture, causing leaf fall. As another example, some units linked in from the flatbed truck unloading a 45 tons of heavy workpieces, due to illegal operation ( the workpiece itself set of 4 rings, hanging only using one of 3 ), after the lifting workpiece offset falling, impact force of the wire rope snapped, causing the workpiece to fall. Therefore, in the lifting of the use and management, cannot be careless and let down.
How to safely use the sling?
One, to determine the operational plan
Lifting operation is a highly technical and dangerous, requiring many people cooperate each other, coordinated, unified command of the special types of work. So the operations personnel to undergo a rigorous training, and certificates. Before start of work must also be on the work site environment, heavy lifting line, the workpiece weight and center of gravity, rigging selection, equipped with lifting equipment whether satisfy the need, through analysis and calculation, correct formulate lifting scheme.
Two, the correct use of sling:
1, the user should be familiar with the various types of slings and the end parts of the performance, use pay attention to item, scrapping standard.
In 2, the sling and hoisted the shape of workpiece features and specific requirements to adapt, in does not have the conditions of use cases, never to use.
In 3, before the operation, deal with rigging and accessories for inspection, confirmed intact, can be used.
In 4, hanging, the right choice of cable; before ascension shall confirm whether the firm, bundle.
5, spreader and accessories can not exceed its rated capacity, slings shall not exceed the corresponding hanging under the maximum working load.
6, work should prevent damage rigging and accessories, if necessary at the edges and corners should be added at the corner protection.
7, sling in the period should adhere to regular inspections, conditional, the large tonnage and the important products of the sling and end fittings should conduct inspection.
Three, seize the large pieces of lifting method
For large workpiece lifting or assembly in place, as the workpiece with large tonnage, complicated, expensive, many people with other factors, to further improve the operation difficulty and danger coefficient, therefore, the sling when large workpieces, should grasp and capture the following methods:
In 1, before the operation to observe the workpiece contour situation, grasp the workpiece position of center of gravity, and on the basis of drawings to confirm the weight of the workpiece.
In 2, right choice, shackle, a rope hook sling. Selection of steel wire rope, single rope bearing force, according to the S ( Newton ) =100 ·D2 empirical formula. Among them: D for steel wire rope diameter, unit mm.
In 3, on the workpiece itself is designed for hoisting and design rings or lug, before operation should be carefully examined, and should be in all the rings on the caucasus.
In 4, the workpiece itself without the rings, the right choice of cable point position. And make the crane hook head alignment workpiece position of center of gravity.
In 5, pay attention to the angle between the general rope should be less than 90 degrees.
In 6, a rope through workpiece corner, corner protection must be added.
In 7, there must be tried before lifting sling procedure, confirmation and then continue to the next step of work.
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