Warehouse racking is how to design the principle

The technical key to the warehouse is the racking system, so its design basis is mainly reflected in the racking, warehouse racking force analysis and calculation is the focus of this technology. Its design basis mainly from the following aspects:

1, the force constant load: constant load refers to the shelf itself structure of the self-weight, connecting the C-beam and the weight of the frame, purlin, frame, roof panels, wall panels.　　

2, stressed live load: live load refers to the weight of the goods and pallets resting on the shelves, but also involves the roof of the snow (rain) load.　　

3, vertical impact load: refers to the impact load generated by the stacker crane to store the goods.　　

4, wind load: is the focus of the overall three-dimensional warehouse force calculation. Generally speaking, the overall three-dimensional warehouse investors are reasonable and effective use of space to start, so the overall height of the three-dimensional warehouse is high, the general height-to-width ratio: L (height) = 1.5 - 2W (width), so that the warehouse under the action of the wind load is an important indicator of safety. Calculation of the effect of wind load on the racking columns will generally be done through the steel structure force calculation software, and at the same time, system force simulation and theoretical calculations should be used for review.　　

5, seismic cracking: according to GBJ11-89 "Building Seismic Design Code", generally take the anti-seismic cracking defense level 7.　　

Shelving structure should be designed according to the most unfavorable combination of load effects listed above. In the design of the overall three-dimensional warehouse rack structure, pay particular attention to the following two most unfavorable combination of loads: wind loads play a role in the full library of the unloaded state of the force; horizontal seismic effect of the full library of the full load of the force. In addition, the distribution of goods in the warehouse should be given full consideration, that is, one side of the warehouse full load, the other side of the empty state, the warehouse foundation force analysis. Despite the existence of the warehouse goods distribution storage theory; Although in the warehouse instructions have been stipulated in the distribution of goods in the warehouse storage as uniform as possible, but in the design calculations we must consider the worst possible.　　

Shelf type selection is also a whole automatic warehouse is very critical issues. Shelf according to its structural type is divided into the whole welded shelves and assembled shelves. According to the standard, assembly type shelf column maximum vertical deviation should not be greater than the full height of 1/120, while the library rack integral shelf column vertical deviation should not be greater than the full height of 1/1000, the vertical absolute deviation value should not be greater than 10mm, so it can be seen that the processing and installation of integral shelves than the combination of shelves to a high degree of precision. Integral automatic warehouse shelving type selection depends mainly on the calculation of various loads, depending on the external dimensions of the warehouse. Due to the assembly type shelves in the installation and construction has a greater uncertainty, so in the overall warehouse design is often used in the overall welding shelves.　　

Integrated welded shelving column material selection also has a square tube, rectangular tube, channel steel and other materials, according to the characteristics and indicators of the profile itself, the choice of square tube is better. For higher warehouses, column selection of variable cross-section and wall thickness is also common performance.