Author: Bobbie Long

1.Safe standing position

In the hoisting operation, under the boom, under the hoist, the hoisted object lifting front area, guide pulley steel rope triangle, fast rope around, standing in the diagonal pull of the hook or guide pulley force direction, etc. are very dangerous, a and the occurrence of danger is extremely difficult to avoid. Therefore, the staff’s standing position is very important, not only their own attention at all times, but also need to remind each other, check the implementation, in case of unpredictable.

2. Correct cognitive sling safety factor

In the lifting operation, the staff does not have the correct cognition of the safety coefficient of the sling, and often takes the basis of using constantly, resulting in the overweight operation is always in a dangerous state.

3. Demolition operation must have foresight to encounter various factors

For example: the estimated weight of the object, the thoroughness of the cutting, the increased load of the demolition parts by extrusion, the forced lifting of the connection parts without inspection, etc.

4. Eliminate erroneous operation

Hoisting operation is not the same as many constructions, involving a large surface, often using different units and different types of cranes. Daily operating habits, performance, command signal differences and other factors are likely to trigger misoperation, so be especially careful.

5. To be lifted object tying must be firm

When aerial lifting and dismantling, the object to be lifted should be “locked” instead of “pocketed”; the sharp edges of the object to be lifted should be taken “pad” measures.

6. The drum wrapping rope is not tight

Large lifting demolition, crane or motorized winch drum winding steel rope arrangement is loose, resulting in a large load of fast rope strangulation into the rope bundle, resulting in fast rope violent shaking, very easy to destabilize, the result often appears to continue to work dangerously, stop and can not stop the embarrassing situation.

7.Temporary hanging nose welding is not firm

(1)Temporary hanging nose welding strength is not enough. Here the welding strength is not enough, is due to the welding of the parent material surface corrosion, the application of welding before the removal of rust spots is not complete, resulting in the appearance of the welded meat beautiful and rich, but the actual welded meat and the parent material is not fused together, the load increases or by the impact, it will occur fracture.

(2) hanging nose force direction single. In lifting or putting down long column-shaped objects, with the change of the angle of the object, the force direction of the hanging nose is also changing, and this situation is not enough consideration in the design and welding of the hanging nose, resulting in the defective hanging nose in lifting operations suddenly break (break). This kind of situation needs to weld the vertical plate on both sides of the nose in advance, and the size and thickness of the vertical plate is designed by the technical personnel.

(3) The welding material of the lifting nose does not match with the base material and informal welder welding.

8. Improper selection of lifting tools or lifting points

Set up lifting tools or with the help of pipeline, structure, etc. for lifting point lifting lack of theoretical calculation, relying on experience to estimate the lifting tools or pipeline, structure lifting load-bearing capacity is not enough or local load-bearing capacity is not enough, a destabilization, resulting in the overall collapse.

9. Pulley, rope selection is unreasonable

When setting up lifting tools, due to fast rope angle change and lead to pulley and tethered pulley rope force change of awareness is insufficient, guide pulley tonnage selection is too small, tethered pulley rope selection is too thin, force after overload caused by rope broken wheel fly.

10. No load sling accidentally hanging objects

There are a lot of accidents happen, lifting work has ended, when the hook with empty rope rigging running, free state of the sling hanging pull has been taken off the hook of the lifted object or other objects, operation of the driver or command staff such as the response is not timely, the instant accident will happen, and such accidents to the operator and crane with very bad consequences.

11. Lifting and hoisting construction plan and the actual operation of the disconnect

The main performance is incomplete content, lack of necessary data or construction methods and the actual operating conditions do not match, so that the construction plan becomes a shield to cope with the superior inspection, and does not play a role in guiding construction.

12. Air suspension for a long time without sealing safety insurance rope

Some equipment or components due to the installation process requirements, need to be suspended in the air first after fixed in place, and some suspended objects in the air stay longer, if there is no safety insurance rope, once by accidental vibration, impact or welding line and other injuries, will cause serious consequences of falling suspended objects.

13. Process handover is unclear or multi-unit construction process balance has loopholes

Such as some structures or platforms on a shift dismantled but off-duty handover is not clear, Zhang San built the shed can be on the people Wang Wu do not know, A unit cut off the platform beam and B unit continue to put heavy objects on the platform, resulting in temporary support overload. The result is that the problem occurred, still do not know what is going on.

14. Construction busy with progress confirmation is not enough

The crane station did not carry out the underground consultation; operation before the weight of the lifting object confirmation is not allowed and the surrounding environment of the high-voltage lines, running equipment, coal oxygen pipeline leakage points and other hidden dangers and the owner unit’s safety warning signs are not found in time and suffer big losses.

15. Use the sling with “fault”

Some people in order to save trouble, looking for a rope buckle on the use, do not know that this is someone else threw the scrap of the rope buckle, some have suffered internal injuries, some partial annealing, and some let the welding hit, and these problems and problems are not easy to check out; there are also greedy for cheap to buy informal manufacturers of pulleys, rings and other unqualified spreader, so that workers work in fear. In order to ensure construction safety, please don’t use the rope buckle thrown by others, cut off the damaged and scrapped rope buckle in time to prevent others from misuse; don’t buy the spreader produced by informal manufacturers.

16. Use sisal rope as safety rope

Because the bearing performance of hemp rope is far less than steel rope, and hemp rope in daily storage and use is very easy to suffer damage and reduce the tensile strength, so the use of hemp rope as a safety rope can not play a safe role, but make people produce psychological dependence caused by accidents.

17. Not set up warning area

Large lifting and aerial work under the dangerous area is not set up in time to pull the safety warning area and arrange the safety guardian, leading to other people do not know the situation into the dangerous area and accidents.

18. The crane long boom lifting heavy objects to “brake rod” is not well considered

When the crane long boom lifting heavy objects, due to the crane boom under the force of the “brake”, the rod head and the weight of the vertical line of gravity change, such as starting rod adjustment is not allowed, will cause the heavy lifting instant shift, such as operators do not take into account, did not take evasive measures (especially in the air), it may be an accident.

19. Two cars lifting and turning an item with the same load is not allowed to count the weight

As the center of gravity in the flip in the change, if the calculation is not allowed, especially easy to lead to one of the crane overload instability and problems, this aspect if the problem occurs not only threaten the safety of people, and mechanical economic losses are huge, history has a deep lesson, need to pay special attention to the construction and technical personnel.

20. Dangerous area operation without taking the necessary precautions

Such as working on the overhead crane beam, prior contact with the overhead crane driver to confirm insufficient or due to the overhead crane driver’s busy error of misoperation, because of the failure to take measures such as hanging warning flags, warning lights, set up car gear, resulting in the sudden appearance of the overhead crane, the construction staff to avoid the accident.

21. Insufficient consideration of climate impact

Open-air gantry crane and other lifting equipment not installed in the gantry crane did not take reliable sealing measures, the use of suspended tower crane hook did not rise to a safe position or anchor sealed in the lighter weight, a gust of wind may cause accidents, and sometimes a sudden gust of rain to short-circuit the power supply, want to lift the hook are too late. Therefore, it is very important to develop good construction work habits. Then again, windy days large lifting must be considered wind load on the crane impact factors, there is a danger or wind more than the safety regulations do not work.

In summary, the lifting operation involves the construction organization, operation design, program development, machine selection, personnel operation skills, construction experience, collaboration and mutual protection, multi-job cooperation, environmental characteristics and climatic factors, etc. Therefore, to do a good job in the lifting operation safety work, need from construction management to personnel operation and other aspects to pay great attention to, strictly according to science.

As lifting operators, in addition to the strict implementation of the relevant provisions, but also to study the operating techniques, timely summary of lessons learned, to improve the ability to prevent accidents, in specific operations, but also pay attention to the construction experience of each person, operating skills, knowledge of the different, the dangers of lifting operations and hidden dangers of judgment is also different, so the role of mutual cooperation and mutual protection in lifting operations is particularly important. Usually also strongly advocate more than a word, more than a hand, more than a suggestion activities. Critical moment, a word, a hand, a suggestion can often be timely to avoid an accident.

In the construction, truck crane construction machinery fuel consumption is a major item in the construction costs. To this end, the first should be based on the construction area in which the temperature selection of the freezing point than the low temperature in the region 3-5 ℃ lower fuel. Fuel saving measures for construction and transportation vehicles and engines should be taken as follows seven tips.

1, truck cranes try to reduce the weight of the vehicle

Therefore, the construction should be removed from the vehicle unnecessary additional equipment without affecting the quality of the project.

2, reduce driving resistance and acceleration resistance

Truck cranes in construction, if the speed is below 400km / h, air resistance can be ignored, but should be noted is the rolling resistance. When the vehicle is driving on uneven roads, because of its frequent jumps caused by the suspension and tire deformation increased, resulting in a large increase in rolling resistance, compared with the case of driving on good roads, fuel consumption increased by 30%-50%, therefore, must be repaired and well maintained construction right-of-way. At the same time, the impact of vehicle tire pressure on rolling resistance is also great. If the tire pressure is reduced on the hard road, the tire deformation is large, rolling resistance increases; if the tire pressure is reduced on the soft road, the tire and the ground contact area increases, the unit area pressure decreases, will make the rolling resistance decrease. Therefore, the construction should pay attention to the changes in road conditions, choose the right tire pressure to reduce fuel consumption. Vehicle transmission gear ratio has a great impact on fuel consumption, construction should try to choose a small transmission ratio of high-speed gear, which can save fuel.

3, improve the engine compression ratio to the standard value

This is also a viable technique, diesel engine compression ratio is generally between 16-22. Compression ratio increased, so that the temperature and pressure at the end of compression increased, which is conducive to the combustion of the mixture, expansion; so that the thermal efficiency of the engine improved, the effective power increased, fuel consumption reduced. Specific measures are: reduce the resistance of the air intake system. The filter should be cleaned and maintained in time to ensure that there is enough air to enter the cylinder in a timely manner. Keep the vehicle has good condition. For the cylinder pressure of the engine, the general diesel engine should be no less than 20% of the standard pressure of the original machine, and the gasoline engine is no less than 30%. For the pressure difference between the cylinders, the general requirements of diesel engines do not exceed 8%, gasoline engines do not exceed 10%. If the cylinder pressure does not reach the required standard, should be required to grind the valve, replace the piston ring, etc.. It should also be noted that the carbon in the combustion chamber will make the compression ratio has a tendency to automatically increase, too high compression ratio and carbon easy to make the cylinder burst combustion, resulting in increased fuel consumption, therefore, the removal of carbon is very necessary; In addition, the intake and exhaust valve clearance must be adjusted to the specified value, because the gap is too large, too small will cause an increase in fuel consumption.

4、School the engine oil supply advance angle

The oil supply advance angle is too large or too small can lead to increased fuel consumption of the engine, therefore, to make the engine have good performance, the oil supply advance angle must be calibrated.

5、Reduce the amount of oil consumption per unit load

Under the conditions allowed by the vehicle, the vehicle’s load is increased to the rated load, which can improve productivity and make the unit weight of fuel consumption significantly reduced.

6、Control the speed of the vehicle

In construction, the road is generally informal highway, even if the road. This situation should master the correct relationship between safety, fuel consumption and vehicle speed aspects. In order to take the T815 car semi-load for example, its fuel consumption and speed relationship is: 25-30km / h speed, less fuel consumption, that is, in construction, this speed that can ensure production efficiency and can do economic and reasonable.

7, the correct choice of truck crane lubricants

Selecting a good lubricant is a key factor in whether the engine of the truck crane can reduce power consumption and reduce fuel consumption. Skillful selection of truck crane lubricants, winter and summer should be selected with different specifications and grades of lubricants.

The global steel industry is witnessing significant growth, thanks to the strong demand for steel products and accessories in various industries. According to a recent report by Market Research Future, the global steel market is expected to grow at a CAGR of 3.9% during the forecast period 2021-2028.

The report cites the construction and automotive industries as the major drivers of the steel market. The demand for steel sheets and plates, bars and rods, pipes and tubes, wires, and forgings is expected to grow due to the rising construction activity in developing economies and the increase in automotive production.

The steel industry is also witnessing the development of innovative products and accessories, such as high-strength steel for lightweight construction and new coatings and finishes to enhance the durability and performance of steel products.

One of the major challenges facing the steel industry is the fluctuation of raw material prices, particularly iron ore and coal, which can significantly impact the cost of steel production. However, technological advancements and efficient manufacturing processes are helping to mitigate these challenges and improve the sustainability of the steel industry.

Leading players in the global steel industry include ArcelorMittal, Nippon Steel Corporation, POSCO, Baosteel Group, and Tata Steel. These companies are investing in research and development to develop new products and manufacturing processes, as well as expanding their production capacity to meet the growing demand for steel products and accessories.

In conclusion, the steel industry is witnessing significant growth amid strong demand for steel products and accessories in various industries. The development of innovative products and efficient manufacturing processes is helping to improve the sustainability and competitiveness of the industry. However, challenges such as fluctuating raw material prices continue to impact the industry, requiring ongoing efforts to develop solutions and improve efficiency.