L68A1 Mast SectionAnalysis on the type selection of tower crane and tower crane in super high-rise building
1. The height of the super high-rise tower structure is high. If the traditional attached tower crane is used, more standard sections of the tower body should be equipped, and a large number of attached bars and corresponding anchors should be equipped. Therefore, the internal climbing tower crane should be used for the super high-rise building with a height of more than 200 meters. The tower crane can be used once to the top through the cyclic installation and removal of three sets of climbing devices attached to the core tube of the tower.
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2. Because of the increasing density of urban buildings, the traditional swing hoisting activities of the flat arm tower crane are largely limited by the interference of surrounding buildings. Therefore, in order to better ensure the safety of production and obtain the best benefits, the boom type tower crane is mostly used in the construction of super high-rise buildings.
3. In the super high-rise buildings, the steel-concrete composite structure is generally used. The larger the lifting capacity is, the larger the steel structure section is, and the corresponding construction progress is more guaranteed, but the corresponding cost is also higher. Therefore, the most reasonable range of lifting capacity of tower crane is to meet the lifting capacity of two to three layers of one lifting of large steel components (such as steel frame column). According to the lifting position, installation position and distance from the center of tower, determine whether the tower crane has the corresponding lifting capacity. When determining the tower crane scheme, there should be room. If the tower crane does not meet the lifting requirements, the tower type must be adjusted to meet the requirements.
In the super high-rise building without steel structure, the selection of tower crane's lifting capacity is relatively flexible, which may lead to the requirements of various heavy objects for tower crane capacity, such as large building components, large steel formwork with maximum weight, construction machines and tools, etc. Finally, the lifting capacity of main materials of the tower is counted, and whether the lifting times of tower crane can meet the requirements is comprehensively calculated.
4. Calculation of lifting times of tower crane
The hoisting times of the tower crane shall be calculated according to the theoretical hoisting times provided in the technical description of the selected tower crane. Generally, the theoretical hoisting times of the medium-sized tower crane are 80-120 times / unit shift, so the actual construction shall be reduced with the increase of the height. In the calculation of lifting times, according to the number of floors planned to be completed in each month of the tower, the physical quantity of vertical transportation that needs to be completed by the tower crane can be counted, the actual lifting times of each month can be calculated reasonably, and then the theoretical lifting times of each month can be calculated (according to the number of shifts arranged per day). When the theoretical lifting times are greater than the actual lifting times, the requirements can be met. When the lifting times are not met, corresponding measures shall be taken to arrange the lifting reasonably In addition, the working time of the tower crane is increased to improve the utilization rate of the tower crane (such as hoisting steel structure in the daytime, hoisting steel bars, formwork and other civil materials in the evening), which has met the schedule requirements. If necessary, the model of the tower crane can also be increased.
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