L68B2 Mast SectionThe depth of Tower Crane Foundation must be determined according to geological conditions
the depth of tower crane foundation must be determined according to geological conditions. Because the tower crane as a large-scale construction machinery, as the Tower Crane Foundation, not only the bearing capacity requirements, but also anti-overturning and stability requirements. Therefore, the depth of the foundation must be determined according to the geological conditions.
L68B2 Mast Section
http://www.towercranesupply.com/product/l68b2-mast-section-for-tower-crane-masts
For the Tower Crane Foundation generally used with the supporting standard drawings to carry out specific construction, the standard drawings have requirements of the minimum height design content, these should be met the most basic requirements. As to how the top elevation should be determined, the + 0.000 of the building can be used as the preferred 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. Pile Foundation technical specification JGJ94-2008, this is the latest, just participated in an expert demonstration, a construction unit still quoted JGJ94-94 in the specification, this should be noted, the specific building owner himself to see the test specification, please the building owner to see JGJ106-2003, in fact, the static load test is mainly to test the bearing capacity of piles, and the loading and unloading methods of the test should conform to the following stipulations: 1 loading should be carried out in stages, and the loading should be carried out in equal quantities step by step; the grading load should be 1/10 of the maximum load or the estimated ultimate bearing capacity; The first stage can be twice the step load. 2 unloading should be carried out in stages, each stage unloading capacity is 2 times of the stage loading, and the unloading capacity is equal to each stage. Loading and unloading shall be carried uniformly, continuously and without impact, and the variation range of each stage load in the maintenance process shall not exceed the increment or decrement of that stage? 10% . 4.3.5 the slow sustained load method should be used in the vertical compressive static load test to provide the basis for design. The test steps of the slow-speed maintenance load method should be in accordance with the following stipulations: 1 the settlement of the pile top shall be measured at the 5th, 15th, 30th, 45th and 60th minutes after each load is applied, and the settlement shall be measured every 30th minutes thereafter. (2) the relative stability criterion of pile settlement: the settlement of pile top is less than 0.1 mm within one hour, and appears two times in succession (from the 30th minute after each stage load, calculated from the settlement observation value of three times or more every 30th minute) . When the settlement rate of pile top reaches the relatively stable standard, the next load is applied. 4 During unloading, the settlement of pile top should be measured at 5,15,30 and 60 minutes, and after unloading to zero, the residual settlement of pile top should be measured at 3 hours, at 5,15,30 minutes, and every 30 minutes thereafter. Slow maintenance load method is generally the detection unit will speed up, depending on where you are from, in the control of the general bearing capacity is described by the amount of settlement
