The use of large-diameter galvanized steel pipes in construction, pipeline engineering, etc., has been widely acknowledged as the strength and corrosion resistance of such materials are very good. Nevertheless, due to the prevailing large diameter and considerable weight of the steel pipes, the hoisting way is regarded to be an unsafe and difficult task. The crucial points to ensure the smooth laying of large-diameter galvanized steel pipes are to scientifically and rightly use the hoisting methods.
1. Hoisting equipment to be used
The first of the tasks is to select appropriate equipment for the process of lifting large-diameter galvanized steel pipes. Some of the known lifting equipment are truck cranes, crawler cranes and tower cranes. Truck cranes are very flexible and appropriate to be used in situations where the site is quite airy and the work site needs to be changed repeatedly; crawler cranes can be used without a strict need of the ground in a lifting operation in mountainous regions thus having terrain that is rather difficult and also boast a good lifting capacity; tower cranes, on the other hand, are commonly seen in the construction of high-rise buildings and are the best choice for vertical and horizontal transportation in a limited area.
Among the factors to be taken into account in the selection of hoisting equipment are the weight, diameter, and lifting height of the steel pipe as well as the conditions of the construction site. As an example, a galvanized pipe with a length of 12m and a diameter of 1000mm might weigh a few tons. In such a case, a large crane that has the corresponding carrying capacity is demanded, for example, a truck crane or even a crawler crane with a carrying capacity of more than 50 tons if the crane is to be efficient and the steel pipe is to be safe.
2. Preparation before lifting
Before formal lifting, a comprehensive inspection of large-diameter galvanized steel pipes and lifting equipment should be carried out. Check whether there are defects such as cracks and deformation on the surface of the steel pipe to confirm that its quality meets the use requirements; check whether the mechanical properties, hydraulic system, brake device, etc. of the lifting equipment are normal to ensure that the equipment is in good operating condition. At the same time, prepare suitable lifting equipment, such as wire ropes, shackles, slings, etc.
The specifications of the wire rope should be determined according to the weight of the steel pipe and the lifting method. Generally, high-strength and flexible wire ropes should be selected, and the breaking tension of the wire rope should be greater than 5-6 times the weight of the steel pipe. The shackle should be adapted to the connection between the wire rope and the steel pipe to ensure a firm connection. If a sling is used, a flat sling with sufficient load-bearing capacity should be selected.
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3. Key points of lifting operation
When lifting, the hook should be lifted slowly to avoid shaking or impact caused by sudden force on the steel pipe. When the steel pipe is 20-30cm away from the ground, the lifting should be stopped to check whether the lifting device is firmly connected and whether the steel pipe is balanced. After confirmation, continue to lift.
During the lifting process, keep the steel pipe stable to avoid collision with surrounding objects. When the steel pipe is lifted to the top of the installation position, it should be slowly lowered and accurately aligned before installation. For steel pipes installed at high altitude, protective measures must be taken to prevent the steel pipe from falling.
4. Safety precautions
The lifting operation of large-diameter galvanized steel pipes is a high-risk operation, and safety issues cannot be ignored. Obvious warning signs should be set up at the construction site to prohibit unrelated personnel from entering the lifting area; lifting operators must be certified to work, strictly abide by safety operating procedures, and wear personal protective equipment such as safety helmets and safety belts.
During the lifting process, always pay attention to weather changes. When encountering severe weather such as strong winds, heavy rains, and thunder and lightning, the lifting operation should be stopped immediately. At the same time, it is necessary to regularly maintain and inspect the lifting equipment and lifting tools, timely discover and eliminate safety hazards.
Conclusion
The lifting of large-diameter galvanized steel pipes requires comprehensive consideration of equipment selection, preparation, operation points and safety issues. Only by strictly following the standard process can the lifting operation be completed safely and efficiently. We are a trustworthy steel manufacturer,provide steel pipe products of various specifications. If you need high-quality seamless steel pipes and welded steel pipes, please contact us!
