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Tower cranes are able to have a maximum unsupported height of 80m or 265 feet. The maximum lifting capacity of a tower crane is sixteen thousand six hundred forty two kg or 39,690 pounds with counter weights of 20 tons. Moreover, two limit switches are used to be able to ensure the operator does not overload the crane. There is also another safety feature known as a load moment switch to ensure that the operator does not exceed the ton meter load rating. Finally, the maximum reach of a tower crane is seventy meters or 230 feet.
There is definitely a science involved with erecting a tower crane, especially due to their extreme heights. First, the stationary structure has to be transported to the construction site by using a huge tractor-trailer rig setup. After that, a mobile crane is used so as to assemble the equipment portion of the jib and the crane. These parts are then connected to the mast. The mobile crane then adds counterweights. Crawler cranes and forklifts may be some of the other industrial machinery which is used to erect a crane.
When the building is erected, mast extensions are added to the crane. This is how the crane's height can match the building's height. The crane crew utilizes what is called a climbing frame or a top climber that fits between the top of the mast and the slewing unit. A weight is hung on the jib by the work crew in order to balance the counterweight. When complete, the slewing unit can detach from the top of the mast. In the top climber, hydraulic rams are used to adjust the slewing unit up an additional 6.1m or 20 feet. Next, the operator of the crane utilizes the crane to insert and bolt into position another mast part piece.
A "loaded container" by description is a container other than in the tare or empty condition, in reference to container handling. Unless otherwise confirmed, containers should be treated as loaded. In order to maintain safety, when securing or handling containers, environmental conditions like wind need to be considered. The term loaded refers to the container's maximum gross weigh rating. To be able to ensure that the centre of gravity is kept as central and low as possible, the cargo should be distributed all around the container.
Having an evenly distributed load it is advantageous to avoid lack of vehicle stability, and excessive tilting, so as to maintain safety. An even cargo helps to avoid unacceptable vehicle axle loading, and unacceptable load concentrations.
The eccentricity of the center of gravity varies, with the distribution of load in the container. It is extremely important that the designers of handling equipment and containers consider in the engineering process. For instance, when sixty percent of the load by mass is distributed in 50% of the container length measured from one end of the machine, the eccentricity corresponds to 5 percent.
Make certain that the container is free to be handled and care has to be taken to make certain it is safely attached to the container, so as to make certain that the machine utilized is perfect for the cargo. Specific attention mus be paid to the possibility of the container tilting due to the eccentricity of the center of gravity. When raising any container whose centre of gravity is mobile or eccentric, like for instance a tank container, a bulk container or a container with a liquid bulk bag or a thermal container with a refrigerating unit, either clip on or integral, or any container with a hanging cargo, extreme care should be taken when lifting these.
