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What is a un-factored load and a factored load?
Oh honey, let me break it down for you. A un-factored load is like a wild horse running free, it's the load acting on a structure without any safety factors applied. Now, a factored load is when we slap on those safety factors to account for uncertainties and make sure that structure can handle whatever life throws at it. So, in a nutshell, un-factored load is the raw deal, while factored load is the safety-net version.
How a Tower Crane is dismantled?
Very tall tower cranes use the self-jacking section of the mast to remove one mast section at a time. Once the main boom is near ground, a conventional crane removes the main boom and counter weights in sequence. Small tower cranes are removed without using the self jacking section by a conventional crane. In rare cases, stiff leg derricks and evenhelicopters can be used.I think to dismantle the tower crane should do these works as follows:1, under normal conditions, will be lifting Gan parallel to the building facades, removal of tower structure using the standard bottle top section, so that gradually the small drop tower, down procedures top-up procedures for the opposite. Until the tower fell to the initial installation height,then with crane tower crane to install according to the order of removal of the opposite.2, in the unusual circumstances, such as the tower fell to the initial installation of a high degree of obstructions can not let the boom down when the order of installation, can be used cranes, lifting arm in the air will be divided into 2 ~ 3 removed but there must be a reliable security measures.3, shaft independent drop tower method. France to adapt to the independent drop tower tower crane installed in the concave on the inside corner of the construction location, due to boom can not continue to decline in the tower on the roof, when lifting arm can be fitted with hinged Department - Auxiliary lifting equipment This would allow the tower continues to fall as well as removal of attached devices so on. Tower in the process of falling down all the parts removed from the auxiliary lifting equipment transported to the ground, until reduced to the initial installation height, in accordance with crane installed in reverse order followed by demolition.The information are from jinan "huiyou"construction hosit company, http://www.towercraneofchina.com/xwzx4.asp?code=wz0000000000022this web has more information , you can go to have a look!
What is an importance factor?
An importance factor is a classification in building design. It is part of the required building code which assigns all buildings a structural occupancy category. This is an extra safety adjustment used to increase the calculated load on a structure based on its occupancy and accounts for the degree of hazard to human life and damage to property.
What is the formula for calculating the Bearing Capacity?
Bearing capacity of soil= Load carried by soil / unit Area Definition : The safly retained capacity by soil is termed as SBC(Safe Bearing Capacity) of soil. While you design a footing , it is the main factor to consider . To calculate the area of footing Area of footing = load/ SBC
What is tensile load?
Think of a tensile load as a "pulling" force. A tensile load is the only type of load that can be taken by a rope, for instance.
Which simple machine is used in lifting a load with crane?
A crane utilizes a combination of simple machines, but the primary one involved in lifting a load is the pulley. The pulley system allows the crane to lift heavy loads with relatively less effort by applying force over a distance.
What is the largest weight of the load that is safe to lift regardless of the angle of the crane's arm?
The largest weight of a load that is safe to lift regardless of the angle of the crane's arm is typically determined by the crane's maximum lifting capacity, which is specified by the manufacturer and should not be exceeded for safety reasons. It is important to always refer to the crane's load charts and operating manual to ensure safe lifting operations.
What is hoist operation?
Lifting and lowering of load on crane is called hoisting operation.
What is a hoist operation?
Lifting and lowering of load on crane is called hoisting operation.
How does the counter weight works in cranes?
The counterweight in cranes works by balancing the load being lifted to prevent the crane from tipping over. It is positioned on the opposite side of the load and its weight creates a counterbalance, ensuring stability and safety during lifting operations. By adjusting the amount of counterweight, operators can fine-tune the crane's balance for different loads.
What is a load radius indicator?
A load radius indicator is a safety device used primarily in cranes and lifting equipment to measure the distance from the center of the crane's rotation to the load being lifted. It helps operators determine the maximum allowable load capacity based on the radius, ensuring safe lifting operations. By providing real-time feedback, it aids in preventing overload situations, thereby enhancing safety during material handling.
Safe lifting of a load by a crane having ensured that the crane has been correctly selected and positioned for the job?
The safe lifting load of any crane that has been properly installed and maintained is determined by the engineering spec. a Crane is designed from the beginning to lift a load by transferring that load through the supporting structure to the ground or/ to the floating vessels structure in the case of a floating crane. All cranes are required to be marked for max capacity, and if it is not marked, get the serial number and contact the manufacture. If no information is available a certified PE must calculate the load limit.
What do you mean by partial safety factor?
The factor of safety for loads is known as partial safety factor. Partial safety factor=Design load/Characteristicload
Safe working loads of engine cranes depends on what factor.?
Safe working loads of engine cranes depend on factors such as the design of the crane, the materials used in its construction, and the lifting capacity of the crane's hydraulic system. It is important to adhere to the manufacturer's guidelines and recommendations for safe working loads to prevent accidents and damage to the equipment.
What is the safe working load for a 3000 ton crane?
The safe working load (SWL) for a 3000-ton crane can vary based on several factors, including the crane's design, configuration, and the conditions under which it is operated. Generally, cranes are rated with a safety factor that typically ranges from 5:1 to 10:1, depending on industry standards and regulations. Therefore, for a 3000-ton crane, the SWL would likely be lower than its maximum capacity, determined by the manufacturer’s specifications and safety guidelines. Always consult the crane's load chart and operational manuals for precise SWL information.
What is the rigging signal used to lift a load vertically?
The rigging signal used to lift a load vertically is usually a whistle or a radio communication system. These signals are important for coordinating the lifting operation and ensuring safety by communicating instructions clearly between the crane operator and the riggers.
What is the purpose of using a jib on a crane?
A jib on a crane extends the reach of the crane, allowing it to lift and maneuver loads beyond the base of the crane. It improves the crane's versatility by enabling it to access tight spaces and work around obstacles. Additionally, the jib can help distribute the load more evenly, enhancing stability and safety during lifting operations. Overall, it increases the operational efficiency of the crane in various construction and industrial applications.
