The knowledge of lashing and lifting heavy objects by crane

Lifting heavy objects with cranes needs to keep the weights in balance. The binding and suspension of heavy objects is an important task. If the binding is not secure, it may cause the heavy objects to fall and cause production accidents. When an enterprise conducts crane training for its employees , it should explain the related knowledge of tying and hanging. The editor will explain the knowledge of tying and lifting heavy objects under the crane.

1. The choice of hanging points

The basic principles for selecting lifting points are:

(1) Calculate the weight of the suspended object

(2) Grasp the center of gravity of the suspended object

(3) Less bending of the wire rope

(4) Try to use the original lifting lugs (loops) of the equipment or components to be lifted.

2. Key points of bundling operation:

(1) Before tying objects or equipment, determine the appropriate lashing point according to the shape of the object or equipment and the position of its center of gravity. Under normal circumstances, the components or equipment are equipped with hoisting rings specifically for lifting. Unopened shipments It is also often indicated that the hanging point is easy to untie. Therefore, it is generally only used to lift lighter objects

(2) Combination knot. It is also a method of connecting two rope ends, which is easy to untie after use.

(3) Bolt knot. Bolt knots are divided into two types, one is the fixed end knot for the cable wind rope; the other is used for the loose flower knot, which can be loosened slowly after being stressed. When in use, the rope coils on the wooden piles should be arranged neatly without heavy pressure, and the loose end (that is, the live end) should be placed underneath, and it should also be prevented from slipping upward when loosened.

(4) Trapezoidal knots, used for lashing cables and wind ropes on masts.

(5) Double trapezoid knot. The mast is used for tying the cable wind rope.

(6) Figure 8 knot. Use hemp rope to lift small objects.

(7) Reverse knot. Hemp rope for lifting long vertical objects

(8) Board head knot. Hang up the footsteps temporarily in the high air for use.

(9) Pipa knot. It is often used to connect the rope with hanging objects and to fix a rope head.

(10) Hook knot. Used for the connection between the rope and the hook.

(11) Carry the stick knot. Used when two people are lifting objects.

(12) Tie the knot. When using a winch

3. Notes for binding:

(1) The rope should be selected according to the geometry and weight of the suspended object, and the angle between the two ropes should be as small as possible when tying and hanging.

(2) When using paired ropes, the length of the two ropes should be the same.

(3) The edges and corners where the rope is in contact with the suspended object should be padded with wood or rubber to prevent the rope from being frayed.

(4) When hoisting tall objects, there must be no rope at the tail (end) of the object to be hoisted to prevent the object from shaking in the air and damaging other facilities.

(5) When unloading, the location should be selected in advance, and the suspended objects should be leveled.

(6) In the lifting operation, the cable operator should cooperate well with the crane commander and the crane driver.

When using a crane to lift heavy objects, it is forbidden to pull diagonally . Make sure that the heavy objects are bound firmly, and it is forbidden to pass or stay under the crane hook.

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