Three common construction methods of space frame bolt ball

The processing of space frame bolt balls is quite special. This kind of device is generally only used in the space frame structure and is not a popular device. Therefore, when constructing this device, it is necessary to formulate the model and style of the bolt ball according to the size and model of the space frame steel rod, and there are three ways to install the bolt ball. Let's take a look together.

1. Production of hollow steel balls and steel pipe rods

In order to ensure the installation and quality of the space frame and space frame bolt ball processing, all hollow steel ball nodes and steel pipe rods are processed in the factory. The steel balls are processed by fetal membranes, and the raw material is 45# steel. The edge is trimmed by a lathe, and the allowable tolerance for processing is: diameter deviation ±1mm, spherical ellipticity deviation <1mm. The allowable deviation of the length of the steel pipe rod is ±1mm, the end face of the rod must be perpendicular to the rod axis, and the allowable deviation is 0.5% R (R is the steel pipe radius), and the maximum bend of the steel pipe rod shall not be greater than 1/1000 of the rod length.

2. Installation of steel space frame

Based on and guided by computer simulation theory, a detailed assembly plan was formulated. According to the characteristics of the project structure and the layout of the construction site, set up a scaffolding work platform on the ground, lay wooden boards on the scaffold, and then assemble the space frame and space frame bolt balls on the scaffolding work platform. The assembly of the space frame is carried out by the aerial bulk method. construction. According to the actual situation of the space frame structure and the characteristics of left-right symmetry, in order to reduce the error accumulation of the space frame in the assembly project, the assembly of the overall space frame should start from the 8 axis and 9 axis of the starting unit, and the starting unit should be assembled first. The vertical and horizontal axis can be adjusted at any time, and the starting unit space frame frame can be unfolded from the center to both sides after it is deemed that the space frame frame of the starting unit is correct. During the assembling process, the rods are hoisted in place by the squeegee, and the assembling and bolting are carried out at the design position.

3. Assembling the starting unit

Directly assemble a single rod and a single node into a space frame, and the position of each node should be measured and checked during the assembling process. After the space frame frame of the starting unit is installed, the self-check is carried out immediately to ensure that the bolts at all nodes are fastened in place. Carry out positioning electric welding (welding 3 points at each support) to ensure that the space frame will not be displaced during the subsequent installation process. Then they are assembled in two directions with the starting unit as the center.