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Precautions for installation and acceptance of tower crane

Source: Time:2020-12-21 08:37:55 views:

Tower crane is one of the most important construction machinery in construction engineering. Due to its towering and upright structure, complex structure, difficult installation, special construction tasks, etc.,
Tower crane is one of the most important construction machinery in construction engineering. Due to its towering and upright structure, complex structure, difficult installation, special construction tasks, etc., the safety of tower cranes is particularly important. A little carelessness can easily cause group death. Vicious accident of mass injuries. In recent years, there have been several tower down accidents in Shenzhen. In particular, the Shenzhen Special Economic Zone has been under construction for more than 20 years. The safety problems caused by the quality of the tower crane itself are worrying, and illegal operations, blindly and reckless installation, jacking and jointing, use, and dismantling still occur from time to time. Therefore, strengthening the installation and acceptance management of tower cranes and preventing tower crane safety accidents is an important part of our daily safety management work. The installation and acceptance of the tower crane must be based on the "Building Tower Crane Safety Regulations" (GB5144-94), "Building Construction Safety Inspection Standards" (JGJ59-99) and the tower crane's own operating instructions, combined with the actual conditions of the construction unit. Circumstances, proceed in a strict, thorough, and orderly manner. The following will discuss the safety management of tower crane installation and acceptance and other related content in conjunction with the Shenzhen Construction Safety Supervision Regulations and the management methods of vertical transportation equipment. 1. Strictly implement the registration and filing system for tower cranes. Vertical transportation equipment such as tower cranes already owned or newly purchased by the construction unit shall be reported to the safety supervision department for registration as soon as possible. It is strictly forbidden to install and use tower cranes without production licenses, product certificates, shoddy manufacturing, and low quality at the construction site. Tower cranes without registration and filing shall not be used at the construction site. 2. Strictly implement the annual technical inspection and inspection system for tower cranes. Vertical transportation equipment such as tower cranes must be tested and inspected every year and after each new installation, which shall be carried out by a qualified unit. The unqualified tower crane must be shut down for rectification and re-tested before it can be reused. It is forbidden to operate the tower crane with faults or hidden dangers. Tower cranes that have been in service for more than ten years, are overhauled and delivered, and whose steel structure is damaged and repaired, must be approved for use only after they have passed the technical appraisal of relevant departments. 3. The assembly and disassembly operations of the tower crane must be carried out by a qualified team, and there must be a relatively fixed management organization and disassembly and assembly operations personnel. Special operations personnel engaged in disassembly and assembly operations and equipment operations must have an operation certificate and a safety post certificate. It is forbidden for teams without equipment dismantling and unlicensed personnel to engage in tower crane disassembly and equipment operation. During the installation operation, the relevant personnel should be informed about the safety technology first, and the command should be unified. Cooperative operation, illegal command, illegal operation, risky and brutal action are prohibited. 4. Before tower crane installation (including jacking and section) and disassembly, a scientific, detailed and feasible construction plan should be formulated according to the tower crane's own characteristics and site operating conditions, including: preparation basis, staffing, lifting machinery and cables Equipment, foundation and attached wall design (with plan and elevation), ground anchor and embedded parts setting, installation steps, jacking and jointing procedures, safety protection measures, etc., adding a crane during the jacking process if necessary The specific requirements for maintaining balance with the balance arm are reliable measures for prohibiting rotation operations. The construction plan can be strictly implemented after being approved by the relevant departments. 5. After the tower crane is installed, it must be commissioned and accepted on site before it can be put into use. The acceptance of the tower crane is carried out by the equipment department of the construction unit, the safety department, the assembly and disassembly team, and the engineering project. The inspection and acceptance shall be carried out in strict accordance with the contents of the acceptance form. At the same time, technical inspections, no-load tests, and load tests should be carried out to ensure the safe use of the tower crane. Strict acceptance must be carried out after each wall attachment, jacking and jointing, to ensure the reliability of the wall attachment and the verticality of the tower. 6. Establish a complete equipment management system, equipment repair and maintenance system, operation and maintenance registration and statistics system, and equipment scrap system. For tower cranes that have been put into construction operations, the pre-shift inspection, safe operation, regular and irregular maintenance, and special safety inspections of the tower crane shall be strictly carried out, and the maintenance work before the installation of the tower crane shall be carried out. In particular, the steel structure, The three major mechanisms of lifting, luffing and slewing and hydraulic lifting system, torque, weight limiter, steel wire rope, pulley, sling and other key and vital parts are inspected to ensure good tower crane performance, no faults, and no safety hazards Carry out construction work. 7. Implement the post responsibility system of "appointing personnel, locating aircraft, and locating posts" centered on the captain responsibility system, and the names of relevant post personnel must be indicated on the tower crane sign. Both the driver and the commander shall be specially trained to obtain an operation certificate and a safety post certificate to ensure that the signal is accurate and the command is in place when the tower crane is operating. Strictly implement the tower crane's safe technical operation regulations and the "ten no hanging" principle, and it is strictly forbidden to command and operate in violation of regulations. 8. The tower crane foundation and attached wall must be manufactured in strict accordance with the requirements of the instruction manual and installation plan. The tower crane foundation should meet the requirements of the tower crane's own foundation bearing capacity and anti-tipping moment, and have reliable drainage measures. After the tower crane exceeds a certain height, a wall attachment device must be installed. The device must be firm and reliable, install accurately, and meet the requirements of tower verticality. If the area or thickness of the foundation cannot meet the requirements due to special engineering, site restrictions, etc., technical measures should be strengthened, such as adding pile foundations or connecting with large-area caps of buildings, etc., and have foundation bearing capacity and Check calculation of anti-tipping moment; when installing the wall-attached device, the angle of the attached wall should not be too small or too large. When the rod exceeds the specified length, a design calculation sheet for the attached wall should be provided. 9. The torque limiter, weight limiter, ultra-high, luffing, rotation, and walking limiter of the tower crane are the most critical devices for the safe use of the tower crane. Each limiter and limiter must be complete, sensitive and reliable. During the acceptance of the tower crane, the above safety devices must be tested and qualified in strict accordance with the tower crane instruction manual, and specific quantitative acceptance content is required. For example, the torque limiter indicates the amplitude (m) and the lifting weight (t); the weight limiter indicates the limit weight (t) for heavy, medium and light gears; the limit distance of the ultra-high limiter (m), etc., an experience is accepted , No individual is allowed to change at will, if it needs to be changed, it must still be carried out in accordance with the acceptance procedure, and it must also be guaranteed to be within the technical performance range of the tower crane. Some units often only debug the torque limiter during acceptance, and even do not do any limiter limiter. In the acceptance result, they only fill in "sensitive and reliable" or "qualified", etc., which are not in compliance with the requirements and necessary Take photos and keep files during the acceptance process. 10. Tower crane hook safety device, hook pulley anti-drop rope device, hoist roll safety device, climbing ladder and guard ring, etc. must be complete and meet the requirements. The hook safety device is indispensable. If it is damaged, the original product must be purchased, and other accessories or self-made parts must not be substituted. The climbing ladder and the guard ring must be intact, firm, and tight, and the ones with small loops, deformation, corrosion, open welding, and unstable fixation should be resolutely rectified and repaired. 11. The tower crane is equipped with a special electric box, reasonably equipped with isolation switches and leakage protectors, and reliable lightning protection grounding. The grounding resistance and insulation resistance must meet the relevant requirements, and the cables must be intact and firmly fixed. The minimum horizontal distance between any part of the tower crane or the edge of the suspended object and the edge of the overhead line below 15kV shall not be less than 1.5m. When the distance is less than this distance, a protective frame shall be erected as required. When the operating radius of the tower crane passes over the overhead line There should be protective measures above the line. 12. When there are two or more tower cranes operating on the construction site or adjacent construction sites, and the operating radius of the tower cranes overlap, there must be reliable anti-collision safety technical measures. (1) The distance between any part of the walking tower crane (including hanging objects) is not less than 5m; for the fixed tower crane, the end of the low tower arm and the high tower body are not less than 2m, and the vertical distance between the high tower crane hook and the low tower is not less than 2m. Prevent interference and collision between the boom and balance arm of adjacent tower cranes and the tower body, tower cap, and tie rods. (2) Adopt organizational measures to stipulate the rotation and walking route of the tower crane, strictly clarify the tower crane command and driver, and supervise and execute it by specialized personnel. It is strictly forbidden for adjacent tower cranes to operate in opposite directions and cross operations in the same construction area to prevent lifting The entanglement of steel wire ropes. (3) Utilize technical means to shorten the boom, raise (lower) the tower body, set walking, rotation, and ultra-high limits, etc., to ensure collision safety. 13. The technical data and safety data of the tower crane on the construction site must be complete. (1) Tower crane production license, factory certificate, instruction manual, equipment files, operation and maintenance records, installation and dismantling plan, acceptance certificate, inspection and inspection report. (2) Qualification certificate of disassembly and assembly team, operation certificate and safety post certificate of equipment installation personnel, command personnel, operators and other special operations personnel. (3) The load-limiting signs, safety warning signs, operating procedures signs, acceptance cards, and person-to-machine signs are hung at the tower crane. The majority of employees must strictly control the installation and acceptance of tower cranes in accordance with relevant regulations and standards, implement various tasks, strictly control and standardize management, and form a system to prevent tower crane accidents and raise the level of safety production to a new level. .

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