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The base of the tower crane is typically bolted to a large concrete pad that provides very crucial support. The base is connected to a tower or a mast and stabilizes the crane that is affixed to the inside of the structure of the building. Usually, this attachment point is to a concrete lift or to an elevator shaft.
The crane's mast is usually a triangulated lattice structure which measures 0.9m2 or 10 feet square. Connected to the very top of the mast is the slewing unit. The slewing unit is made of a gear and a motor which allows the crane to rotate.
Tower cranes are able to have a maximum unsupported height of eighty meters or two hundred sixty five feet. The tower crane's maximum lifting capacity is sixteen thousand six hundred forty two kg or thirty nine thousand six hundred ninety lbs. with counter weights of 20 tons. Furthermore, two limit switches are utilized in order to ensure the driver does not overload the crane. There is even one more safety feature called a load moment switch to make sure that the operator does not exceed the ton meter load rating. Lastly, the maximum reach of a tower crane is two hundred thirty feet or 70 meters.
Because of their extreme heights, there is a science involved to erecting a crane. The stationary structure would first need to be transported to the construction location by utilizing a large tractor-trailer rig setup. Next, a mobile crane is used so as to assemble the equipment part of the jib and the crane. These sections are then attached to the mast. The mobile crane then adds counterweights. Crawler cranes and forklifts could be some of the other industrial equipment that is utilized to erect a crane.
When the building is erected, mast extensions are added to the crane. This is how the crane's height could match the building's height. The crane crew uses 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 so as to balance the counterweight. Once complete, the slewing unit is able to detach from the top of the mast. In the top climber, hydraulic rams are utilized to adjust the slewing unit up an additional 6.1m or 20 feet. Then, the crane operator utilizes the crane to insert and bolt into position another mast part piece.
Utilizing a Standard Counterbalance Forklift
1 Perform a pre-shift inspection before operating the machine. Occupational Safety and Health Administration guidelines state that a pre-shift checklist must be carried out at the beginning of each work shift. Every different machinery along with its attachments has its own checklist listing emergency brakes, lights, brakes, steering, horn, controls and safety features.
2 Start up the equipment and check controls. First ensure your seatbelt is fastened and the seat is firmly in place and adjusted for your comfort. Look under the equipment after you move it for any indications of leaks. The operation of each type of forklift is different.
3 Don't forget differences in the basics of forklift operation compared to a standard vehicle. The forklift's rear end swing occurs due to the fact that the truck steers with its rear wheels. Forgetting this information is a main reasons for injuries and accidents to employees. The almost 90-degree turn from the front wheels should be done with great care. These top-heavy equipment have a high center of gravity even without a load. When moving or lifting a load this top-heaviness is exacerbated.
4 Keep forks near the floor when traveling. Use caution when approaching loads. Be sure the forks line up correctly with the pallet. Lift the load only as high as is necessary, tilting it back to help stabilize the equipment. Only drive backwards if the load is very big that it interferes with driver vision.
5 Before loading and unloading, check the wheels on trucks/trailers. When carrying a load, it is not advised to travel on slopes. The equipment can tip over on a slope. When driving on an incline is necessary, always drive up the incline and back down. The load must be kept on the uphill side of the truck.
6 The driver should be definitely in control all the time. The primary reason for operator injuries is tip-over. The driver must never try to jump out of the truck in case of a tip-over. The safest way is to lean away from the direction of fall while holding the steering wheel and bracing your feet.