L48A1 Mast Section the safety operation rules of the lower tower crane: machinery, personnel, environment, operation and other requirements
(1) The bearing capacity of the foundation soil of the tower crane must be strictly in accordance with the original use regulations or meet the requirements: 8-12T / ㎡ for medium-sized tower and 12-16t / ㎡ for heavy-duty tower.
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(2) The track foundation or concrete foundation of the tower crane must pass the design checking calculation, and can be used only after passing the acceptance. Side slopes and drainage facilities shall be built around the foundation, and a certain safety distance shall be kept from the foundation pit.
(3) The disassembly and assembly of tower crane must be carried out by a professional team with the disassembly and assembly qualification certificate issued by the construction administrative department, and technical and safety personnel shall be present for supervision during the disassembly and assembly.
(4) The disassembly and assembly personnel shall wear safety protection articles, fasten the safety belt when working at heights, and be familiar with and carefully implement the disassembly and assembly process and operation procedures.
(5) After the installation of the tower crane, the technical inspection and adjustment of the whole machine shall be carried out, and the crane can be delivered for use only after passing the inspection in stages and the whole machine. Under no load condition, the perpendicularity deviation between the tower body and the ground shall not exceed 4 / 1000. The electric motor and hydraulic device of tower crane shall be in accordance with the relevant regulations on electric motor and hydraulic device.
(6) When the wind force reaches level 4 or above, lifting, installation and dismantling operations are not allowed. Before jacking, check the connection of all components of the hydraulic jacking system. It is forbidden to rotate the boom and other operations during jacking.
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(7) In case of severe weather such as gale above level 6 or heavy rain, snow, fog, etc., the tower crane operation in the open air shall be stopped. After the rain and snow or in the rain and snow, the operation shall be carried out after the trial hoisting and the brake is confirmed to be sensitive and reliable.
(8) The metal structure of tower crane, track and metal shell of all electrical equipment shall have reliable grounding device, the grounding resistance shall not be greater than 4 Ω, and lightning protection device shall be set.
(9) The arrangement, mutual spacing and wall attachment distance of each attachment device shall be in accordance with the regulations of the original factory, and the self-made brace shall be provided with design calculation sheet.
(10) Tower crane shall not be operated near overhead transmission line. If it is limited to site conditions, safety protection measures must be taken when it must be operated beside the line. The safe distance between tower crane and overhead transmission line shall meet the requirements.
(11) Before operation, it is necessary to have a comprehensive understanding of the surrounding environment, driving roads, overhead power lines, buildings, component weight and distribution of the work site.
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