Tower installation process and precautions
(1) When the iron tower is shipped from the factory, the manufacturer is required to provide the steel purchased:
1. Steel product quality certificate or test report.
2, the product certificate issued by the iron tower factory.
3. Weighing records weighed when each base tower is shipped from the factory. Check whether the actual weight is consistent with the design weight, so that the material of the tower material can be controlled according to the design requirements, avoiding the replacement of large tower materials with small tower materials and the replacement of thick tower materials with thin tower materials.
The design drawings can also be used to check the length, thickness and width of various towers such as main limbs, transverse webs, and inclined webs to verify whether they are consistent with the design. If necessary, the physical properties and chemical composition of the tower can also be tested to check whether the galvanizing quality and manganese steel and ordinary steel are used in the site.
4. Before the mass production of the iron tower, it is necessary to sample the production of a base in a ratio of 1:1 and pass the assembly and then mass production.
During the processing, the iron tower should be inspected for its welding quality and bolt holes. For example, before welding, the weld seam and the welding rod and the surface of the welding wire must be cleaned of oil, rust, etc. The surface of the weld should be smooth, wrinkle-free, intermittent and unfilled. The traps and weld metal should be fine and free of cracks and slag inclusions. After welding, the welding inspection must be carried out in accordance with national standards.
The weld inspection level is two grades, and the important welds are 20% ultrasonic flaw detection according to the secondary weld requirements. The weld length and height are all filled except for those already indicated in the figure. It can also check whether the surface of the galvanized layer is continuous and smooth, without burrs, nodules, sharp spots, residual zinc slag, etc. Whether the thickness and uniformity of the galvanized layer meet the design requirements; the number of bolt holes should reach Meet the requirements of design and specifications. Through the above inspections, to ensure that the quality of the tower meets the design requirements.
(2) Before the installation of the tower, all components shall be inspected one by one. The specifications, dimensions, quantity and appearance of the inspection components shall be consistent with the design. During the installation of the tower, the supervisors may inspect and inspect that the tower is in the process of transportation. No deformation, distortion, whether it is lost, whether it is missing, whether it is safe and civilized construction.
1. Construction process;
a, install the tower foot;
b, stand up mast;
c, lifting the main material;
d. Install the first main material and the auxiliary materials on the two sides;
e. Lifting two main materials on the adjacent sides;
f. Install two other sub-materials;
g, fluttering the mast (when the root is open, the mast must be raised);
h, lifting the diagonal main material;
i. After lifting the mast, lift it according to the above construction process;
j, platform installation;
k. The construction of the rafter is completed;
2, construction technology points: with built-in and pull wire mast lifting, the main material is hoisted by a single pole, the auxiliary material is based on the principle of the piece, the upper part can be lifted in pieces when the light is light, the lifting parts are lifted from the tower as the principle, the platform from the tower Lifting outside.
(3) After the installation of the tower is completed, the process can be checked by instruments. For example, use the theodolite to check the front of the tower, whether the vertical deviation of the side meets the requirements of the index (≤H/1500. H tower height, which is a very important indicator). Use a torque wrench to check whether the bolt tightening degree is met (m≤16, 70N/M; m>16,100N/M) Whether the bolt thread is exposed after fastening, whether the iron busbar and the feeder bridge are properly installed and in place. The construction specifications are as follows:
1. The squad leader organizes a safety meeting to learn safety regulations and safety measures for specific projects, so that everyone can truly realize the importance of safety from the ideological point of view, truly consciously abide by the company's safety management system, enhance safety awareness, and ensure safe production.
2. After entering the site, observe and familiarize the environment and terrain of the construction site, measure the root opening, diagonal and level of the foundation, and make a record.
3. Before starting work every day, the squad leader must explain the safety measures according to the topographical conditions of the site, confess the work tasks, clear the command signals, and check all the tools and tools.
4. After the materials enter the site, organize the unloading of the vehicles in time. It is strictly forbidden to turn the materials down arbitrarily. Pay attention to the protection of galvanizing when unloading the trucks, and stack them in order according to the specifications.
5, the mast connection must be straight, connecting bolts and double caps. When standing up, the division of labor must be clear and coordinated. When the mast is set to 70°, the winch should be stopped and the cable wind should be adjusted. The cable wind control must be undertaken by experienced personnel.
6. When lifting the first section of the member, the angle of the mast is not less than 45°. If the mast position cannot be satisfied, the weight of the lifting member should not exceed 1 ton. If necessary, consider using the pulley block and reinforcement. Rod.
7, lifting wire rope, cable wind ropes must be kept 80% new, or timely replacement.
8. The effective height of mast lifting must be within 3/5 of the total length indicated by 扒.
9. When the mast has no cable wind, the inclination should be strictly controlled within 5°. The mast foot must be fixed at the position where the main material will not slide. The diameter of the fixed steel sleeve should be <15mm.
10. The mast must be smashed with a new white brown rope of 16mm and the force per strand is even.
11. When starting to hoist, the chief commander of the ground and the commander of the aerial work must pay close attention to the force of the mast. After the mast is fully stressed, it can be lifted after confirming that there is no problem. The component must be balanced during the lifting process. Strictly guarded by the tower body, the high-altitude workers must stand in a safe position, not allowed to chat, joking, should always be vigilant, and then the components reach the installation height, and then in place.
12. After the first main material is installed, the two sides and the rear fork iron must be sealed first, and then the other main materials are hoisted by the ram. The hoisting rope must be hung on the base of the mast to reduce the lateral force of the mast. .
13. It is strictly forbidden to throw things down at high altitude. Tools and bolts must be placed in special tool bags. Rope must be used to transfer them up and down.
14. If there are small components, it is difficult to install at one time. It is strictly forbidden to suspend. The components must be placed down and straightened to prevent accidents from being caught and stepped on the lower tower. When a main component is missing, it is strictly prohibited to cross the installation.
15. It is strictly forbidden to carry out lifting and high-altitude operations in bad weather such as rain and snow, dense fog, icing on the tower, high temperature at noon or strong winds above six.
16. The commander of the aerial work should always supervise the safety of other high-altitude workers. Always check to remind everyone to use the seat belt correctly, take care of each other, help, and face the problem to be calm, take it seriously, and strictly prohibit the risky and ruthless, without reliable measures. It is better to stop working and ask the company leaders to handle it.
17. It is strictly forbidden to wear hard hats or idlers within the working radius of the iron tower within 15 meters. Try to reduce the double-layer operation. The ground workers should give active cooperation to the high-altitude workers, and the above signals will respond in time.
18. Every time you install 1~2 segments, you must measure the verticality and adjust it before loading it.
19. The cutter driver should always check and maintain the brake system and gear box of the winch. The signal command without the command powder should not be lifted or loosened. It is strictly forbidden to use the method of loose tail rope for loose grinding. When lifting, pay attention to whether the steering pulley will be disengaged or stuck, check whether the winch fixing is firm. If there is any problem, report it to the commander in time and reinforce it in time.
20. When the whole tower is installed, the verticality is adjusted to the best condition and the whole tower bolt is tightened before lifting the platform. After the whole tower is finished, the verticality is adjusted to the best condition. (1/2000)
21. Pay attention to safe use of electricity. It is strictly forbidden to connect electric welding power to lighting or elevator power supply. The site must have leakage protection device.
22. Always protect the construction site in a neat and orderly manner. Every day work must be completed and the site is clear, and all kinds of tools are in good condition.
23. If you find an accident seedling or a hidden danger, you should report it to the squad leader in time to discuss the countermeasures in a timely manner. Take effective measures to ensure safety, report to the company promptly in the event of an accident, and take effective measures to organize rescue and deal with the problem on the spot.
24. Obey the supervision and guidance of mobile companies, factory supervisors, and employees, respect their suggestions, and be patiently explain when disputes with our opinions. It is strictly forbidden to leave the site without any reason or for no reason.
25, must do a daily work diary, detailed records of some special cases of processing errors, work schedules and the scope of responsibility of high-altitude workers.
26. After the completion of the individual project, the squad leader must personally inspect the tower. The ground crew should promptly clean up the garbage around the tower and the residence, and settle all expenses. The owner, the construction unit and the factory will sign the approval on the construction form before they can appear.
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