What are the precautions for the use of rigging in lifting and hoisting projects?

1.Develop good hoisting habits and plan how to hang, lift and unload before lifting work.

2.Preparation: Determine the weight of the object to be lifted and its center of gravity, read the attached documents carefully, and mark the lifting point and weight data. Only after determining the center of gravity can the hook be hung in the appropriate position!

3.The crane operator is informed of the weight of the object being lifted.

4.The crane hook should be hung vertically above the center of gravity of the object to be lifted.

5.Lifting lifting objects should not only avoid damage to the lifting objects, but also prevent damage to the rigging itself. To avoid spinning or falling, the following conditions should be observed:

a) For a single-leg rigging, the lifting point should be located vertically above the center of gravity of the lifting object.

b) In the case of a two-legged rigging, the rigging points should be located on both sides of the lifting object and the lifting point should be above the center of gravity.

c) In the case of three-legged and four-legged rigging, the rigging point should be evenly located at the level of the center of gravity of the lifting object and above the center of gravity of the lifting object.

Attention must be paid to the lifting angle (located between the vertical line and the lifting legs): the larger the lifting angle, the smaller the lifting capacity. A lifting angle of more than 60 degrees is absolutely not allowed!

For those who use chain rigging).

1.The weight of the lifting object shall not exceed the limit working load of the spreader, and the spreader used should be visually inspected before use, and the limit working load of the spreader shall be checked according to the lifting load of the spreader, and it can be used only after meeting the requirements.

2.The spreader is not allowed to repair or rework (welding, heating, heat treatment, surface chemical treatment), if the above treatment is necessary, it should be sent back to the original manufacturer or under the guidance of the original manufacturer's experts.

3.When lifting heavy objects, it is strictly forbidden to stand under the heavy objects.

I don't know, it's not that professionals don't understand, I don't dare to talk nonsense.

1. It is strictly forbidden to overload it.

2. Unmarked slings are not allowed to be used after being confirmed.

3. The parts on the sling assembly parts are regularly inspected according to the requirements of the combined parts.

4. Do not use hammering to correct the distorted spreader.

5. Slings are forbidden to be thrown.

6. Do not pull or roll the weight under the sling.

7. The slings purchased outside must be products that are produced, inspected, certified and maintained by professional manufacturers in accordance with national standards. In the obvious place of the product, there must be a non-wear rated lifting capacity, production number, manufacturing date, manufacturer name and other marks. The user unit shall prepare safe use procedures and maintenance systems according to the characteristics of the instruction manual and the use environment.

Dear, hello, I am happy to answer for you, the safety requirements of the hoisting rope are.

1. Noun annotation: Spreader: Rigid fetching device for lifting and lifting operations (such as:

Hooks, C-hooks, oil drum tongs, etc.). Sling: When lifting items, tie and hook on the item with a flexible fetch device.

Such as: wire rope, wire rope rigging, synthetic fiber sling, man-made fiber sling, etc.) Spreader rated lifting capacity: The spreader is allowed to bear the maximum weight of the item when hanging vertically.

Ultimate Working Load of a Sling: Refers to the maximum weight that a single sling is allowed to bear when suspended vertically. Maximum safe working load for slings:

In addition to the vertical suspension use, there is an angle between the sling lifting point and the article, so that the sling force changes, and the maximum weight allowed to bear under a specific hanging mode is called the maximum safe working load of the sling. (Vertical hanging = 1;.)Knot sleeve hanging=; Parallel hanging = 2;45° angle hanging=; 90° angle hanging=; 120° angle crane = 1) Second, the general safety management regulations of spreaders and slings: 1. The purchase of spreaders and slings (1) must be a professional manufacturer.

According to the national standards for production and inspection, with certificate of compliance and maintenance, maintenance instructions. (2) The rated lifting weight, production number, manufacturing date and manufacturer name are marked in the obvious place of the product. 2. Load verification of spreader and sling The newly purchased spreader and sling should be put into use only after passing the test load and test method on the basis of no-load operation and test qualification.

1) Static load test: 1) The spreader takes the times of the rated lifting capacity 2) The sling takes the times of the limit working load of a single branch and a branch. 3) Test Method:

The test load gradually increased and was lifted to 100 200 mm above the ground. The suspension time shall not be less than 10 minutes. The test was repeated three times for visual inspection.

4) Judgment: If there is no crack or permanent deformation in the structure, and there is no abnormal loosening or damage at the joint, the static load test is qualified.

Precautions for operation:

1) The rolling method for loading and unloading mobile equipment used in soil construction, the thickness of the roller bar should be consistent, and the annual width should be 50cm longer than the width of the pallet row, and it is strictly forbidden to fill the roller bar with gloves. When loading and unloading the truck, the slope of the piping shall not be greater than 20 °, the erection of the raceway should be smooth and solid, the joints should be staggered, the speed of rolling should not be too fast, and the rope should be used if necessary.

2) In the process of installation, if problems are found, measures should be taken in time, and then continue to lift after treatment.

3) When hoisting large-scale tower equipment with a lever, a plurality of winches must be operated together, and the winch speed of each winch must be approximately the same, so as to ensure that the force of each lifting point on the tower body tends to be roughly uniform, so as to avoid the uneven force of the tower body and deformation.

4) when using the rotary method or the knockdown method to hoist the tower tank, the hinge wrist installed at the bottom of the tower body must have the ability to resist the horizontal thrust generated in the lifting process, the left and right slip ropes of the tower body must be firm in the lifting process, and when the tower body rotates in place at the height, it slowly falls into the foundation to avoid accidents and deformation.

5) When the equipment is installed on the frame or on the building, its strength and stability should meet the requirements of the installation conditions. After the equipment is installed and positioned, it should be connected and fastened or welded according to the requirements of the drawing, and the strength and stability required by the design can be decoupled only after it has been satisfied, otherwise it must be temporarily fixed.

Precautions before hoisting operations.

1. Check that the safety protection devices and indicating instruments should be complete.

2. Fuel, lubricating oil, hydraulic oil and cooling water should be added sufficiently.

3. Before starting the oil pump, let the engine run at low speed for a period of time.

4. Check the wire rope and connection parts should comply with the regulations.

5. Check whether the hydraulic pressure is normal.

6. Check the tire pressure and the connectors should not be loose.

7. Adjust the clear lead and the legs, be sure to lay the legs that are stretched out in the prescribed order, make the lifting in a water state, and adjust the body so that the inclination of the slewing bearing surface is not greater than 1 1000 (the level bubble is centered) when there is no load.

8. Fully check the ground conditions of the work site. The ground of the work site must have the moment conditions that can level the crane and fully withstand the outriggers.

9. Pay attention to whether the foundation is soft, if it is soft, you must pad the wooden board or soil block that can bear the legs.

10. The outriggers should not be close to the foundation according to the square lot.

The safe operation has:

1. The driver must operate according to the lifting performance of the tower crane he drives. Lifting heavy objects must comply with the provisions of this regulation.

2. When there is a failure, failure or inaccuracy in the operation of various safety protection devices on the plane, it must be stopped immediately for repair, and it is strictly forbidden to work with illness and repair and maintenance during operation.

3. The driver must operate in strict accordance with the command signal, flag and gesture under the command of the personnel wearing the command signal armband. Audio signals should be sent out before operation, and blind operation should not be made when the command signal is not clear. It has the right to refuse to carry out the command error or take the initiative to take preventive or corresponding emergency measures.

4. When the lifting weight, lifting height, luffing and other safety devices display or approach the critical alarm value, the driver must pay close attention and strictly prohibit forcible operation.

1.Purpose: This system applies to the production department.

2.In order to ensure safe construction, ensure the personal safety of employees and complete equipment, reasonable selection, correct operation, scientific maintenance of lifting ropes and spreaders, pay attention to safe use and strengthen safety work, this system is formulated.

3.When the warehouse is accepted, the certificate of conformity must be carefully checked.

1) Lifting wire ropes, slings, white and brown ropes, hooks, pressure hooks, rings, snap rings and other tools, the warehouse must carefully check the manufacturer's certificate of qualification before issuance, before it is allowed to be put into use.

2) No certificate or self-made lifting tools, must be in accordance with the relevant technical standards (provisions) for material inspection and load test, inspection and trial inspection of the absence of qualified inspection and grinding before being put into use.

4.The lifting spreader rented from outside the construction site must have a certificate of conformity before it can be put into use.

5.Strictly follow the safety regulations and use the crane correctly.

1) When using wire rope (white brown rope, sling), to prevent mechanical damage or corrosion, the wire rope (white brown rope, sling) and the edges and corners of the object contact start, take liner protection measures, in the use of wire rope to prevent contact with the welded iron conductor, so as not to affect the performance of the rope and the amount of planting.

Answers]: a, d

This question examines the requirements for the use of cranes and spreaders. When the wire rope is bypassed the pin or pulley of the same size, its strength should be reduced according to different bending conditions.

The wire rope loop (lifting belt) shall not be used in one of the following situations:

1) The end of the rope at the no-hanging sign is exposed and cannot be repaired.

2) The strands are loose or detached and cannot be repaired.

3) Defects such as broken wire, broken strands, wire extrusion, single-layer strand wire rope core extrusion, partial reduction of wire rope diameter, rope strand extrusion or twisting, kinking and so on. That's right.

4) No signage.

There are national standards for wire rope slings, wire rope slings inserted cable buckles GBT16271-2009 and wire rope slings ring rope GBT30587-2014.

Crane users need high-quality wire ropes, which should be wire ropes with long service life and highly stable and reliable quality. At present, the first time in the field of steel wire rope in the world to take prevention and control measures for fretting fatigue is the phosphate coated wire rope produced by patented technology, the rope wire is treated with manganese phosphating or zinc-manganese system, the wear resistance and corrosion resistance of the steel wire surface are comprehensively improved, and the fatigue life of the wire rope is greatly improved, and the fatigue life of the wire rope is three times that of the smooth wire rope with the same structure, and the comparison of the highest test value has reached an astonishing four times. It can be verified by fatigue test, if you have a fatigue testing machine to do your own comparative test, such test results are the most credible, the service life of the wire rope is proportional to the fatigue life, the fatigue life is long, the service life is extended in the same proportion, the use cost is lower, the stability is better, the phosphate coated wire rope is produced by patented technology, because the supply exceeds the demand is difficult to buy, you need to ask a few more wire rope manufacturers, please note that the purchase invoice must indicate the name of the wire rope, such as phosphate coated wire rope, In addition, patented products are generally sprayed with patent numbers on the outer packaging of wire ropes, and the warranty should have main technical indicators, such as the type of phosphate film and film weight (the size of the phosphate film, wear resistance, corrosion resistance, etc. have an important impact on the service life of the wire rope), for reference only.

Hanging beam fixtures are widely used in major ports and wharf hoisting sites, web links Hoisting is generally large objects with large tonnage, and it is easy to hoist safety hazards and construction personnel dangers if you don't pay attention to it in the hoisting process, so the safety factor of slings is a very important link.

What problems should be paid attention to in the use of hanging beam clamps?

The lifting or assembly of large goods is in place, due to the large tonnage of the workpiece, the complex shape, the high value, the cooperation of multiple people and other factors, which further increases the difficulty and risk factor of the operation.

The following matters should be paid attention to in the hanging beam fixture:

Observe the shape of the goods before operation, grasp the position of the center of gravity of the workpiece, and confirm the weight of the workpiece according to the drawing.

Correctly choose slings such as ropes, shackles, hooks, etc. When using wire rope, the tensile force of a single rope can be calculated according to the empirical formula of s (Newton) = 100·d2. Wherein: d is the diameter of the wire rope in millimeters.

There are rings or lugs specially designed for hoisting on the workpiece itself, which should be carefully inspected before operation and added to all the rings.

If the workpiece itself does not have a lifting eye, the position of the cable point should be selected correctly. And make the hook head of the crane align with the center of gravity position of the workpiece.

Note that the angle between the ropes should generally be less than 90 degrees.

The edges and corners of the workpiece through which the rope passes must be protected by corner protection.

Before lifting, there should be a test lifting process, and then continue to the next step after confirming that it is safe.