Tower crane-tower crane-construction hoist tower crane-Jinan Hengsheng Construction Machinery Co., Ltd
2020-08-22 10:30

Summary of safety education and safety inspection points of


Accidents caused by improper operation and use of tower crane occur from time to time, and the consequences are often shocking. In this paper, 16 safety control points of tower crane operation are summarized according to "technical specification for safety of use of construction machinery" (jgj33-2012).


1. The track foundation and concrete foundation of tower crane must be checked by design and can only be used after passing the acceptance; slope and drainage facilities should be built around the foundation, and a certain safety distance should be kept from the foundation pit.
2. The disassembly and assembly of tower crane must be equipped with the following personnel: project leader, safety director and mechanical management personnel with safety production assessment certificate; special operation operators such as construction hoisting machinery installation and disassembly workers, lifting drivers, lifting signal workers, rope drivers and other special operation operators with construction special operation operation operation qualification certificate.
3. The disassembly and assembly personnel shall wear safety protection articles, fasten the safety belt when working at heights, be familiar with and seriously implement the disassembly process and operation procedures.

4. Before lifting, check the connection of various components of the hydraulic jacking system. It is strictly forbidden to rotate the boom and other operations during lifting.塔式起重机安全教育、安全检查要点汇总

5. After the tower crane is installed, the overall technical inspection and adjustment shall be carried out, and the tower crane can be delivered for use after passing the inspection in stages and the whole machine. In the case of no load, the vertical deviation between tower body and ground shall not exceed 4 / 1000.
6. The metal structure, track and the reliable shell of all electrical equipment of tower crane shall be provided with reliable grounding device, the grounding resistance shall not be greater than 4 Ω, and lightning protection device shall be set up.
7. Before operation, it is necessary to have a comprehensive understanding of the surrounding environment, driving roads, overhead power lines, buildings and the weight and distribution of components. During the operation of tower crane, there shall be no obstacles within the lifting, landing and turning radius of tower crane boom, and the safety distance from overhead transmission line shall meet the requirements.
8. The commander and operator of tower crane must be on duty with certificate. During operation, the signal of the commander shall be strictly followed. If the signal is not clear or wrong, the operator shall refuse to carry out the signal.
9. Before slewing, luffing, walking and hook lifting of tower crane, the operator shall check whether the power supply voltage reaches 380V, and the variation range shall not exceed + 20V / - 10V. Before power transmission, the start-up control switch shall be at the zero position and shall sound for indication.
10. The safety protection devices of tower crane, such as boom luffing limiter, travel limiter, moment limiter, hook height limiter and various travel limit switches, must be safe, complete, sensitive and reliable, and shall not be adjusted or removed at will. It is strictly forbidden to replace the operating mechanism with a limit device.
11. Tower crane machinery shall not overload and lift objects of unknown quality.
12. In case of sudden power failure, all controllers shall be turned to zero immediately, power switch shall be disconnected, and measures shall be taken to safely lower the weight to the ground. It is strictly forbidden to hang the heavy object in the air for a long time after lifting.
13. When lifting heavy objects, the binding should be stable and firm. It is not allowed to hang or stack scattered objects on the heavy objects. Sporadic materials and articles must be firmly bound with cage or steel wire rope before lifting. It is strictly forbidden to use tower crane for cable-stayed, inclined hoisting and lifting heavy objects buried underground or condensed on the ground.
14. In case of gale of level 6 or above or severe weather such as heavy rain, heavy snow and fog, the open-air operation of tower crane shall be stopped. When working after rain and snow or in rain and snow, trial hoisting shall be carried out first, and the operation can be carried out after confirming that the brake is sensitive and reliable.
15. When the lifting load reaches 90% or more of the rated lifting capacity of the tower crane, the weight shall be lifted no more than 20cm from the ground, and then the following items shall be inspected: the stability of the crane, the reliability of the brake, the stability of the heavy object, and the firmness of the binding. The lifting can be continued only after the safety is confirmed.
16. The lifting and falling speed of heavy objects should be uniform, and sudden braking is strictly prohibited. The left and right rotation movement should be stable, and the reverse movement is not allowed before the rotation is stable. It is forbidden to drop freely with load for non gravity descending tower crane.
Safety inspection of tower crane:
According to the standard for safety inspection of building construction jgj59, the safety inspection and evaluation of tower crane (tower crane) shall comply with the provisions of the current national standard safety regulations for tower crane (gb5144) and the current industry standard technical specification for installation, use and disassembly of tower crane in construction (jgj196).

Tower crane inspection scoring table:


The inspection and evaluation guarantee items of tower crane shall include: load limiting device, travel limit device, protection device, hook, pulley, drum and wire rope, multi tower operation, installation and disassembly, acceptance and use. General items shall include: attachment, foundation and track, structural facilities, electrical safety.

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