L48A1 Mast Section 1764/5000 Analysis of the selection of tower crane type and tower crane type in Super high-rise buildings
Super high-rise buildings, tower crane is still the first choice for lifting equipment. In construction, it is very important to choose the right model. The following is an analysis of the selection of the tower crane and the selection of the tower crane model.
1, the height of the Super high-rise tower structure is high. For example, using a traditional attachment tower crane, it needs to be equipped with more tower body standard joints, and a large number of attachment rods and corresponding anchorages. Therefore, super-high-rise buildings over 200 meters should adopt an inner-climbing tower crane, and they should be installed and dismantled through three sets of climbing devices attached to the core cylinder of the tower to achieve a one-time use of the tower crane.
2, and due to the increasing density of urban buildings, the traditional flat arm tower crane swing lifting activities are largely limited by the interference of the surrounding buildings. Therefore, in order to better ensure the safe production and obtain the best benefits, most of the high-rise building tower construction is the use of movable arm tower crane.
3, Super high-rise buildings are generally steel-concrete hybrid structures, the greater the weight, the larger the steel structure segment, the corresponding more can guarantee the construction progress, but the higher the corresponding cost. Therefore, the most reasonable range for lifting the weight of a tower is to meet the lifting capacity of two to three layers of large steel components(such as frame steel pillars). According to the location of the lifting, the location of the installation, and the distance from the center of the tower, it should be determined whether the tower crane has the corresponding lifting capacity. There should be room for determining the tower lifting scheme. The tower lifting does not meet the lifting requirements. The tower type must be adjusted to meet it.
In super-high-rise buildings without steel structure, the lifting weight selection of towers is relatively flexible. There may be requirements for the lifting capacity of towers for various weights, such as large building components, large steel models of maximum weight, construction tools, etc.. Finally, the lifting capacity of the main materials of the tower is counted. Whether comprehensive calculation tower lifting can meet the requirements.
4, tower lifting calculation
The lifting time of the tower crane should be calculated according to the theoretical lifting time provided in the technical description of the selected tower crane. Generally, the theoretical lifting time of the medium-sized tower crane is 80 to 120 times. Only in the actual construction will it be reduced accordingly with the increase of height. The number of floors that can be completed according to the monthly plan of the tower can be calculated according to the number of floors to be completed. The physical amount of vertical transportation that needs to be completed by the tower crane is calculated. The actual number of hoisting times per month is calculated reasonably, and the theoretical hoisting times of the tower hoist per month are
calculated(according to the daily row). Number) When the theoretical lifting time is greater than the actual need to use the lifting time to meet the requirements, when it is not satisfied, appropriate measures should be taken to reasonably arrange the lifting time, increase the working time of the tower lifting, and improve the utilization rate of the tower lifting(such as hanging steel structure during the day). In the evening, hoisting reinforced steel, templates and other civil materials), has met the progress requirements, if necessary, can also increase the tower hanging model.
