Key points of maintenance work of tower crane whic

Key points of maintenance work for tower cranes that are out of service in winter

each subsidiary 1 has been focusing on the in-depth research and development of special metal materials in their respective fields, so that in winter, the weather in northern China turns cold, and most of its areas will snow and ice. The tower crane (hereinafter referred to as tower crane) on the construction site also stopped. With the difference of regional latitude, it will be shut down for about months. It is of great significance to do a good job in the maintenance of the tower crane that stops work for the winter: it can keep the tower crane in good condition, extend the service life of the tower crane, and eliminate or reduce the unsafe factors in the work next year

at a construction site in front of Jinzhou station, the tower crane was shut down due to the project suspension, and there was almost no maintenance on the site. After a few years, the tower crane was rusted and the whole machine was scrapped. There are also some tower cranes. After the shutdown, the maintenance work is not done well, which affects the work of the tower crane in the coming year and increases the maintenance cost. At the same time, it will also bring some unsafe hidden dangers

in recent years, with the construction of low-rise residential buildings in small and medium-sized towns, the consumption of qt20 tower crane has increased rapidly. However, most of the construction teams with qt20 tower cranes are small, and they are not perfect in the management, use, maintenance and other aspects of tower cranes, and the personnel experience is relatively poor. We now make some suggestions on the maintenance of qt20 tower crane after shutdown. For the reference of the driver, maintenance and management personnel of the tower crane

1. Several main aspects of tower crane maintenance after shutdown

anti collapse tower

in winter, the temperature in the north is low and the wind is strong, which will have a negative impact on the stability of the tower crane in non working conditions. This should be done well in the following aspects

(1) reinforce the base, and there should be enough weight blocks on the base, which should be firmly fixed. For the tower crane that can run along the guide rail, check the stability of the guide rail, the equality between the guide rails, the condition of the two rails on the same horizontal plane, and the anchoring device should be reliable

(2) overhaul the tower dry slewing mechanism to ensure its flexible rotation, sufficient lubrication between the rotating parts of the slewing mechanism, reliable connection between each other and flexible rotation

(3) the lifting trolley should be located at the appropriate range of the jib in the residential area, which should be conducive to the balance of the tower crane jib balance arm, and the hook should be lifted close to the maximum lifting height

1.2 protective cover of electrical equipment

during the safety inspection, we found that the protective cover of some electrical facilities on the tower crane. After being removed in the maintenance work, the impact strength can be calculated. At that time, the production task was heavy and the time was urgent. After the electrical facilities were repaired, the cover was not installed at that time, and was thrown aside. If it took a long time or was lost, or it was used for other purposes, or it was damaged so that it could not be installed, it would not be installed. In this case, it is necessary to make the next installation cover to avoid electrical damage. As for the weight of the protective cover, it has little impact on the balance of the tower crane. It is important to strengthen the protective cover, and there is no need to make it according to the original design

1.3 rust prevention

for tower cranes that have been shut down for months, rust prevention is an important work. In recent years, the proportion of acid rain in the sky is increasing, which will also have a negative impact on the tower crane. Before the shutdown and maintenance of the tower crane, the surface paint film of the whole machine should be comprehensively checked

(1) for the damaged part of the paint film on the metal structure, Qingxin should clean the surface of the component and apply antirust paint and decorative paint film to protect the metal surface from corrosion after rain and snow

(2) in the movable part of the tower crane, such as the hinge between the jib and the tower, the connecting pin shaft between the sling and the crane, all guide wheels, trolley wheels, etc., rust prevention work should be done carefully. We have talked about this topic with many drivers and maintenance personnel who drive various types of tower cranes. We believe that after shutdown, the level of these parts is very important. 4. Use -10 or -20 diesel oil first, and brush these parts with a brush to remove impurities, moisture, rust spots, etc. that can lead to rust. Because -10 or -20 diesel oil is more permeable than engine oil, it can penetrate into the loaded spliced parts to produce oil film on the metal surface. Because of its low freezing point, it can resist low temperature

(3) apply a layer of grease after cleaning and lubricating with diesel oil. Calcium base grease or lithium base grease should be applied, because these two greases have good mechanical stability, adhesion and water resistance, and the freezing point can also reach -20 degrees. Do not use sodium base grease, because this kind of grease is heat-resistant and water-resistant, and the effect will be worse. When applying grease, the coating should not be too thick, and the application method should also take into account the convenience of removing these greases before re using in the next year

the above is the method. More importantly, management requires a rigorous and scientific management system

2 strengthen the formulation and implementation of maintenance system

(1) maintenance work should be carried out immediately after the tower crane is shut down, and a specially assigned person should be responsible for distinguishing the project, key maintenance parts, and working procedures. The span of each dustpan is 1 mile (about 1.6 kilometers) and system, etc

(2) regular inspection and maintenance system. At least 3 inspections shall be carried out during the shutdown months. Carefully make inspection records and timely remedy the damaged maintenance measures. Repair again

(3) maintenance under special circumstances. For example, after snowfall and rainfall, relevant personnel should be organized immediately for maintenance and inspection. In the inspection work, due to the cold weather and high-altitude operation, it is necessary to formulate safety measures and wear all kinds of labor protection articles