132HC Mast Section Checking calculation of tower crane foundation, construction technology and type selected
Model definition of tower crane
132HC Mast Section：
http://www.towercranesupply.com/product/132hc-mast-section-liebherr-tower-crane
For example, QTZ40 (4208) QTZ - self elevating tower crane 40 - Nominal lifting moment is 400kN · m 42 - arm length 42m 08 - lifting capacity at arm end 42m is 0.8t, tower crane model power QTZ80 (6012) 50, tc6013 49.4 is as high as 60-12, construction elevator power (kw)
Tower crane installation technology
Attached and disassembled foundation geological exploration report: in the foundation pit, the foundation silty clay of tower crane is 140kpa, and the other tower crane is clay 160. I am engaged in the investigation. The soil gravity provided in the investigation report generally refers to the natural gravity γ, not the saturated gravity γ sat, nor the dry gravity γ D, nor the floating gravity γ '. You should go to the manual of this tower crane. There are calculation formulas and construction requirements. Each tower crane has different foundation, different geological conditions and different foundation.
Checking calculation of tower crane foundation
The checking calculation of tower crane foundation is divided into two parts, to meet the requirements of overturning moment and ground pressure stress. The factory manual of tower crane has the values of overturning moment and ground endurance of tower crane. 1g / cm3 = 1000kg / m3 the size and depth of tower crane foundation shall be determined according to the specific in-situ stress value of tower crane foundation. It needs to be determined through conversion. Generally speaking, there are detailed instructions on the stress requirements of the foundation of the tower crane, the size of the foundation pit and the size of the foundation of the tower crane in the instructions of the tower crane, and the foundation fabrication drawings are attached. You can look for them. The distance between the tower crane and the building: the normal value is 4-6m, and the minimum value cannot be less than 2 times the width of the standard section, which is not only difficult to install and remove, but also the angle between the supporting wall of the tower crane and the standard section of the tower body is too small, which will affect the stability of the tower body. In the plane layout, a clear height difference of at least 2m shall be considered between the jibs (including luffing trolley and hook) of 2 tower cranes.
What type of tower crane is used?
132HC Mast Section：
http://www.towercranesupply.com/product/132hc-mast-section-liebherr-tower-crane
Calculation basis? The calculation basis is 1: the maximum weight to be lifted 2: the radius of the tower crane 3: the tower crane with short construction period and high efficiency is selected 4: the plane shape of the building, the plane position of the distribution of main hoisting materials and many other factors. The determination of the position of the tower crane foundation should meet the following conditions: first, the convenience of installation and disassembly; second, the maximum use efficiency; third, the avoidance Interference between high voltage line and multi tower operation; finally, consider that the attachment device can meet the requirements of the operation manual as much as possible. Plain concrete: 2.4 tons per cubic meter; reinforced concrete: 2.5 tons per cubic meter. Does the overturning moment given in the instructions of the tower crane include the safety factor? Is the tower crane foundation designed to multiply by 1.4 times the safety factor? Generally, the overturning moment given in the instruction manual of tower crane includes the safety factor, so it is better to make it directly according to the basic scheme in the instruction manual.
132HC Mast Section：
http://www.towercranesupply.com/product/132hc-mast-section-liebherr-tower-crane
