L46A1 Mast Section Common problems and preventive measures in the operation of tower crane foundation and attached wall
1. Common problems
L46A1 Mast Section：
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① the foundation ground endurance does not meet the requirements of the tower crane regulations, and blind construction without piling or pouring pile measures results in large foundation settlement after the installation of the tower crane, and the perpendicularity inclination exceeds the specifications, resulting in accidents.
② the accident occurs due to the shortage of foundation reinforcement or the uncompacted concrete pouring and the insufficient concrete strength during the maintenance period, and the installation of tower crane.
③ due to the needs of the engineering structure, the distance of the attached wall of the tower crane does not meet the requirements of the factory operation manual, and the attached rod is too long. In the process of operation, there is no special scheme and calculation, or the attached rod is made of inferior materials whose quality does not meet the national standards. During the welding operation, the failure, false welding and undercut of the weld lead to the tearing of the weld or the fracture of the member.
2. Preventive measures and methods
L46A1 Mast Section：
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The foundation shall be made in strict accordance with the instructions, and the ground endurance shall meet the basic requirements. The foundation reinforcement shall be strictly in accordance with the requirements of the specification and shall not be increased or decreased at will. When pouring, the concrete grade shall not be lower than C35. After pouring, water storage and maintenance shall be done for pressure test block (7d and 28d groups), settlement observation point shall be done, and the whole machine shall be installed when the strength of pressure test concrete reaches more than 95%. The tower crane shall be observed and recorded regularly after installation. The stress of overlong attached wall shall be checked and calculated by the manufacturer's design or unit's technical engineer and submitted to the superior competent department for approval, and shall be made of qualified raw materials. In the process of welding, professional welders with certificates shall be assigned for operation, and welding shall be carried out in strict accordance with the requirements of wall attached scheme.
In addition to the above-mentioned mechanical construction and operation requirements, through long-term construction time, we also make the following suggestions from the aspect of human management:
Organize a professional team with high professional quality, strong technical force and rich operation experience to be proficient in the whole process of disassembly and assembly machinery, and master the professional technology of this type of work.
< 2 >. The on-site commander in chief shall have a strong sense of responsibility, a high sense of safety, know the professional technology of electromechanical integration, understand the structural principle, performance and use method of tower crane, be familiar with the disassembly and assembly process, master the hoisting technology, and have certain on-site command, organization ability and emergency response ability to deal with emergencies.
< 3 >. The professional team must be composed of the person in charge with the title of engineer or above, mechanical and electrical engineers or mechanical and electrical technicians and relevant professionals, equipped with certified machine operators, installers, repairers, electricians and auxiliary workers, and issued with qualification certificates after training by relevant departments. All operators shall work with certificates.
< 4 >. Strictly implement the scheme approval and safety technical disclosure before tower crane installation and disassembly.
< 5 >. Relevant departments and on-site safety management personnel shall adhere to the supervision and inspection during the disassembly and assembly of tower crane.
In a word, tower crane is an important large-scale mechanical equipment in the construction site. Good use of it is the fundamental premise and guarantee for its maximum function and safe operation. All construction units must be people-oriented, sustainable development, strengthen the management of tower crane disassembly and assembly, ensure the real implementation of safety production, and resolutely put an end to the occurrence of major malignant accidents of tower crane. In order to eliminate all hidden dangers in the process of dismantling and using tower crane, we must solve them in a safe, effective and reliable way without carelessness, which is the responsibility of the vast number of equipment managers and operators.
L46A1 Mast Section：
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