Space frame bolt ball construction and characteristics

 Nowadays, the rapid development of social construction, many large-scale engineering and construction process, will be applied to the bolt ball space frame, in many large shopping plazas, office buildings, and frozen warehouses in the beginning of the use of steel buildings, plant steel structure is divided into light steel structure plant and heavy steel structure plant, bolt ball space frame plays an important role. So, in the end, what are the benefits of bolted ball space frame? What are the characteristics of bolted ball space frame? Here we will come together to understand it:In the construction process of many large office buildings, bolted ball space frame is light weight, relatively strong plasticity, the use of high strength steel, manufacturing plant span, can be made into a larger span of the structure. Net frame commonly used node bolt ball node is rod and ball through the high * bolt connection to realize, the site is easy to install, can greatly shorten the construction period, but also can improve the construction efficiency.

In addition, the net frame commonly used nodes bolted ball node advantage is that has a complete set of parts standard drawing to guide the production, easy to factory processing, division of labor, the weight is relatively light, the steel used in good plasticity, the structure in the ordinary condition will not be occasionally overloaded or partially overloaded and suddenly fracture, and often can be made according to the needs of the actual project.

We will find that the characteristics of the bolt ball space frame is more obvious, plasticity, according to the actual engineering needs to make, manufacturing lightweight, high precision, and bolt ball space frame made of components transported to the site installation, high level of dismantling, installation rate is fast, therefore, the bolt ball space frame in the construction of many large-scale projects play an important role in the process. Here we explain the production process:

 1, bolt ball and steel pipe rod production

  In order to ensure the installation and quality of net frame and net frame bolt ball processing, all hollow steel ball nodes and steel pipe rods are centralized processing in the factory. The steel ball is processed by tire film, and the raw material is No.45 steel. Using lathe cutting edge, processing allowable tolerance: diameter deviation ± 1mm, ball ellipticity deviation <1mm. steel pipe rod length allowable deviation ± 1mm, rod end face and rod axis must be perpendicular to the allowable deviation of 0.5% R (R for the radius of the steel pipe), the maximum bending of the steel pipe rod shall not be greater than 1/1000 rod length.

 2、The installation of steel net frame

  ased on the computer simulation theory and guidance, a detailed assembly program was developed. According to the structural characteristics of the project and the layout of the construction site, scaffolding platforms are set up on the ground, planks are laid on the scaffolding, and then the space frame and space frame bolts are assembled on the scaffolding platforms, the space frame is assembled by the aerial bulk method of construction. According to the actual situation of the net frame structure and the symmetry of the left and right characteristics, in order to reduce the accumulation of errors in the net frame in the assembly project, the whole net frame should be assembled from the starting unit 8 axis, 9 axis between the beginning of the first assembly of the starting unit of the longitudinal and transversal axes, ready to correct the size of the starting unit of the net frame in the view of the start of the error can be unfolded from the center to the two sides. During the assembling process, the bars will be lifted into place by the bailing bar, and the assembling bolts will be connected at the designed position.

  3、Starting unit assembly

   Directly single rod, a single node assembled into a net frame, in the process of assembling each node position should be measured and double-checked. Starting unit of the net frame installation is completed, immediately carry out self-check to ensure that all the nodes at the bolt fastening in place. Positioning welding (each support welding 3 points), to ensure that the net frame in the back of the installation process does not produce displacement. Then the starting unit as the center of the two directions at the same time assembled.

 (1) Basic unit assemblyStarting unit other than the net frame using the air bulk method for assembly, the first assembly of small units, and then the total assembly of the net frame, assembly of the net frame according to the actual situation of a reasonable division into small units, and finally formed the whole net frame. Firstly, choose a top chord triangular cone, and use one top chord horizontal bar, three webs and one top chord ball to put together a unit cone that meets the design requirements. When assembling, all the bolts at the node ball of the unit cone should be screwed in place. After assembling this cone should be corrected, the diagonal error of the lower chord rectangle should not exceed 1mm, in line with the above provisions is qualified, you can proceed to the next step of construction.

 construction.