Construction technology of general structure of space frame bolt ball

 1. Production of hollow steel balls and steel pipe rods

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

2. Installation of steel space frame

Based on and guided by the theory of computer simulation, a detailed assembling scheme is made. According to the characteristics of the engineering structure and the layout of the construction site, scaffolding work platform is set up on the ground, planks are laid on the scaffold, and then the scaffolding work platform is assembled with mesh and bolt balls. The assembly of the mesh frame is carried out by air bulk method. According to the actual situation of the grid structure and the characteristics of left and right symmetry, in order to reduce the error accumulation of the grid in the assembly project, the assembly of the overall grid should start from the 8 axis and 9 axis of the starting unit, the vertical and horizontal axis of the starting unit should be assembled, and the size should be corrected at any time, and the starting unit grid can be expanded from the center to both sides after it is considered that the starting unit is correct. In the assembly process, the rod is hoisted into place by the scraper, and the assembly bolt is connected in the design position.



3. Grouping of starting units

Directly assemble a single bar and a single node into a network frame, and the position of each node should be measured and checked during the assembly process. After the grid of the starting unit is installed, conduct a self-check immediately to ensure that the bolts at all nodes are fastened properly. Position welding (3 points welded at each support) is performed to ensure that the grid does not displace during subsequent installation. Then the center of the starting unit is assembled in two directions at the same time.

(1) Assembly of basic units

The grid frame other than the starting unit is assembled by air bulk method, and the small unit is assembled first, and then the total grid frame is assembled, and the grid frame is divided into small units reasonably according to the actual situation when assembling, and finally the entire grid frame is formed. First, select a top string trigonal cone, and use a top string horizontal rod, 3 belly rods and a top string ball to spell out a unit cone that meets the design requirements. When assembling, all bolts at the spot of the unit cone section should be screwed in place. After the completion of this cone should be corrected, the diagonal error of the lower string rectangle should not exceed 1mm, in line with the above provisions is qualified, can carry out the next step of construction.

评论

发表评论

此博客中的热门博文

The development status of the space frame structure

图片
The development status of the space frame structure space frame   structure has been developed greatly in the last 30 years, and has been widely used inside and outside. space frame   structure plan arrangement is flexible, space shape is beautiful, convenient for building shape processing and decoration, decoration, can adapt to different span, different plane shape, different support conditions, different functional needs of the building.   Especially in the roof structure of large and medium span, the space frame   structure shows its superiority and is used in large number of large sports buildings, public buildings, industrial buildings, and also widely used in the roof of some small buildings, such as gas stations, toll stations, large canopies. In recent years, with the wide application of electronic computers and the development of computing technology, the design efficiency of the space   frame structure has been greatly improved. The construction and installation of the space
阅读全文

Cooling method of steel building structure

图片
 Steel structure plant mainly refers to the main load-bearing components are composed of steel. Including steel columns, steel beams, steel structure foundation, steel roof truss (of course, the span of the factory is relatively large, basically now are steel structure roof truss), steel roof, pay attention to the wall of steel structure can also be maintained by brick wall. Due to the increase of China's steel production, many have begun to use steel structure plants, which can also be divided into light and heavy steel structure plants. Industrial and civil construction facilities made of steel are called steel structures. 1. Heat preservation and cooling: Steel structure plant insulation film can isolate most of the solar radiation and conduction heat, reduce the indoor greenhouse effect. Then the temperature of the plant is greatly reduced to improve the environment of the steel structure plant. The commonly used methods now have the following two choices: the steel structure
阅读全文

What is the truss welding method?

图片
  truss roof Most of the rods in joist structures are welded at the nodes. Before welding, the webs and chords need to be cut in advance according to the shape of the weld seam of each member to be welded, which requires cutting of the web ends and slotting of the chords. Since the joist structure is intersected by coherent line between the rods and rods, the shape of rod end section is complicated, so in the actual cutting process, two methods of mechanical automatic cutting process and manual cutting process are generally used.
阅读全文