256HC Mast SectionThe depth of tower crane foundation must be determined according to geological conditions
The depth of the tower crane foundation must be determined according to the geological conditions. Because tower crane as a large construction machinery, as the foundation of tower crane, not only has the requirements of bearing capacity, but also the requirements of anti overturning and stability. Therefore, the buried depth of the foundation must be determined according to the geological conditions. For the tower crane foundation, the standard drawings are generally used for specific construction, and the minimum height design content is required on the standard drawings, which should be the most basic requirements that must be met.
256HC Mast Section：
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As for how to determine the top elevation, the ± 0.000 arrival of the building can be used as the first reference. In this way, it is convenient to install the additional safety system of the tower crane to ensure the safety of the tower crane. Technical specification for pile foundation jgj94-2008, which is the latest, has just participated in an expert demonstration meeting, and a construction unit is still quoting JGJ94-94 in the specification description. It should be noted that the specific owner of the building should look at the testing specification himself, please look at JGJ106-2003, in fact, the static load test is mainly to test the bearing capacity of the pile
The loading and unloading mode of the test shall meet the following requirements:
1. The loading shall be carried out in different levels, and the loading shall be carried out in the same amount step by step; the grading load shall be 1 / 10 of the maximum load or the estimated ultimate bearing capacity, and the first level can be twice of the grading load.
2. The unloading shall be carried out in different levels. The unloading amount of each level shall be 2 times of the rated load when loading, and the unloading shall be carried out in equal amount step by step.
3. During loading and unloading, the load shall be transmitted uniformly, continuously and without impact, and the change range of each level of load in the maintenance process shall not exceed 10% of the increase and decrease of this level.
256HC Mast Section：
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