290HC Mast SectionSafety use of tower crane and inspection of four limit and two safety devices
Generally, the working temperature of tower crane is - 20 ℃ ~ + 40 ℃, and the working wind speed is not more than grade 6. Tower crane drivers and riggers must be trained and have a special machine license to operate the tower crane. Safe operation of tower crane must be "five good" and "ten no lifting". The five good points are: good concentration of ideas; good contact between the upper and the lower; good machine inspection; tight lifting; good command.
290HC Mast Section：
http://www.towercranesupply.com/product/290hc-mast-section-liebherr-tower-crane
Ten no hoisting means: (1) no hoisting is allowed when someone stays or walks under the boom and the lifted heavy objects; (2) no hoisting is allowed when there is no command or the signal is unclear; (3) long and thin multi objects such as steel bars, section steel and pipes must be tied up, and no hoisting is allowed when the single head is "one kilogram" or the binding is not firm; (4) porous floor, ash hopper and hand push are not allowed No hoisting is allowed when the dumper is not hoisted by four points; (5) safe and reliable block clamps must be used to hoist the blocks, brick cages must be used to hoist the blocks, and the blocks and embedded parts must be stacked in order, and the sporadic objects such as wooden bricks and embedded parts must be stacked with containers, and the blocks shall not be hoisted if they are not stacked properly; (6) no hoisting is allowed when people stand on the suspended objects such as floor slabs and girders; (7) slab columns, well point pipes, etc. buried in the ground, as well as adhesion and adhesion Objects shall not be lifted; (8) for multi machine operation, the distance between lifting objects shall not be less than 3m, and for multi machine operation on the same track, lifting is not allowed without safety measures; (9) lifting is not allowed in case of strong wind above level 6; (10) lifting is not allowed in case of inclined load or load exceeding the allowable mechanical load.
The four limit and two safety devices of tower crane must be complete, sensitive and reliable. In case of any abnormal noise during the operation of tower crane, stop the crane immediately and put it into operation after maintenance. Check the wear and lubrication of the wire rope frequently, and replace it immediately if it does not meet the requirements. Before each operation, the switch contact of each safety device shall be tested with no-load and in the correct position. Check the verticality of the tower body regularly < 3 / 1000. When the tower crane is not working, release the brake device of the slewing mechanism, and lift the hook to the boom. It is strictly forbidden to hang heavy objects on the hook. The walking tower crane must loosen the rail clamp. In the use of tower crane, the proportion of accidents caused by safety equipment failure, operation error, especially overload is very high. It should be emphasized here that the so-called "operational errors" are not all unintentional or unintentional. Many of them are man-made and should be done even when knowing that accidents may occur. In addition, some tower crane users will cut off the moment limiter before the tower crane is bought and put into use. Safety and benefit can't be opposed, let alone shorten the construction period and improve benefit at the cost of losing safety.
290HC Mast Section：
http://www.towercranesupply.com/product/290hc-mast-section-liebherr-tower-crane
