(9) After the jacking of installation and disassembly, all connecting bolts shall be tightened according to the specified pre tightening force, the guide rollers of the jacking jacket shall be in good agreement with the tower body, the left and right control rods of the hydraulic system shall be in the middle position, and the power supply of the hydraulic jacking mechanism shall be cut off.
08 when multiple tower cranes cross work at the same construction site, a special scheme shall be prepared and anti-collision safety measures shall be taken.
If the fault cannot be eliminated in a short time, the jacking jacket shall be lowered to the original position and the connecting bolts shall be fastened in time.
Slewing jib and other operations are strictly prohibited.
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The following is the dangerous moment of tower crane collapse, which is shocking! Safety precautions for tower crane operation? 18 cartoons to help you 01 tower crane lifting driver, lifting signalman, rigger and other operators shall obtain the qualification certificate of special operation personnel, and it is strictly prohibited to work without certificate.
03 operators entering the site must wear safety helmets, protective shoes, safety belts and other protective articles.
Non operators are not allowed to board the operation console of the jacking jacket.
How dangerous is the tower crane accident? People who have not experienced it at the scene may not know.
If the wind force becomes larger or smaller intermittently during operation, the operation must be stopped immediately and the upper and lower tower bodies must be firmly connected.
(3) If the wind force is above level 4, jacking operation shall not be carried out.
(3) Check the hydraulic cylinder, oil tank, jacking jacket structure, guide wheel, hanging shoe and climbing claw of the jacking hydraulic system of the jack up tower crane, and deal with the problems in time.
(4) Check the power supply and power supply lines to ensure normal power supply.
A warning area shall be set up on the operation site, and irrelevant personnel are strictly prohibited to enter.
It is forbidden to use tower crane to carry personnel.
It is strictly prohibited to hang the lifted object in the air for a long time.
A person was trapped on the inclined beam of the tower below the break, holding the steel frame in both hands, and was unable to determine whether safety measures had been taken.
If there is any abnormality, check and adjust it in time.
A specially assigned person shall also measure the verticality change of the tower body with a theodolite and make records.
After the tower crane is lifted to the specified height, the tower body must be attached to the building before it can be lifted.
(2) The jacking operation must be operated under the command of a specially assigned person.
However, the attachment device must not be removed in advance, and can only be removed when it is lowered to the attachment section.
(10) After the lifting, the verticality of the tower crane shall be measured, and each limit device shall be rechecked and adjusted..
09 in case of emergency during operation, measures shall be taken to lower the lifted object to a safe place.
(7) The height of the free end of the tower crane shall meet the requirements of the instructions.
10 in case of strong wind with wind speed of 12m / s or above or severe weather such as heavy rain, snow and fog, the operation shall be stopped.
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04 special construction scheme shall be prepared before installation and disassembly of tower crane, which can be implemented only after approval.
The site pictures taken by netizens show that the broken position of the tower crane is higher than the nearby high-rise building, the boom of the tower crane has disappeared, and there are signs of breaking at the connection.
Official account: at noon on December 8, 2021, a tower crane falling accident occurred at a construction site in Gedian development area, Ezhou, Hubei.
One person is assigned to operate in the operation room and strictly obey the signal command.
06 tower crane shall not be installed and used if any of the following conditions are found before installation and during use: (1) there are visible cracks and serious corrosion on the structure; (2) Plastic deformation exists in the main stressed components; (3) The connector has serious wear and plastic deformation; (4) The steel wire rope meets the scrapping standard; (5) Incomplete or invalid safety devices.
(5) When removing the connecting bolt (PIN) between the rotary table and the standard section of the tower body, if it is difficult to install and remove the last bolt, the diagonal bolt shall be reinserted and other measures shall be taken.
(2) Check limit switches, protection devices, alarm and display recording devices, electrical protection, safety protection devices and facilities, and deal with problems in time.
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If any fault is found during jacking, the jacking must be stopped immediately for monitoring, and the jacking can be continued only after the fault is eliminated.
(8) The precautions for jacking during disassembly are the same as above.
(4) During jacking, the jib and balance arm must be balanced, and the rotating part must be braked.
11.
(6) During jacking, pay attention to the pressure change of the hydraulic system at any time.
Do not loosen bolts (pins) by rotating the jib.
Some netizens said that when they passed by, they saw the tower crane break and turn twice in the air.
The main inspection contents are as follows: (1) check all mechanisms, parts, structural welds, bolts, pins, hoists and wire ropes, hooks, lifting appliances, safety devices, electrical equipment and lines of tower cranes, and deal with problems in time.
The following safety precautions shall be paid attention to during jacking operation: (1) before jacking, check the connection of various components of the hydraulic jacking system, adjust the gap between the guide roller of the jacking jacket and the tower body, then loosen the cable, its length is slightly greater than the jacking height, and fasten the cable reel.
05 before operation, a comprehensive inspection shall be carried out to prevent any hidden dangers and ensure safe operation.
02 before the use of tower crane, safety technical disclosure shall be made to operators.
07 when the tower crane is used, no one is allowed to stay under the jib and lifting objects; When lifting objects, it is strictly prohibited to pass over personnel.
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3 people were killed and 1 injured.
