Five requirements for temporary fulcrum for space frame installation

      1. During the installation of the steel space frame, the requirements for the temporary fulcrum are very high. The fulcrum and the elevation of the fulcrum should be arranged before installation. The temporary fulcrum should make the grid support uniform force and the force of the space frame members should be consistent. Pay attention to the stability of the foundation (scaffolding) of the temporary fulcrum, and pay attention to prevent the fulcrum from sinking.

2. the support of the temporary fulcrum is very good to use a jack, so that it can be adjusted gradually during the installation process. Note that the adjustment of the temporary fulcrum should not be the adjustment of a certain point, but also consider the uniform force of the surrounding space frame. Sometimes this local adjustment will deform and bend individual rods. 

3. When disassembling the temporary fulcrum, it should be noted that several groups of fulcrums should be lowered synchronously. During the descending process, the descending range should not be too large, it should be gradually divided into sections and stepped down proportionally, or with equal steps of no more than 100mm method to remove the support point.

4. When installing and welding the welded spherical space frame, the deformation of welding shrinkage should be considered, especially the overall hoisting space frame and strip space frame. After installation on the ground, the welding deformation and shrinkage value should be mastered before welding. Because when the steel space frame is welded, the welding points (heating surface) are all on the upper side of the plane space frame, so it is very easy to deform the structure due to unidirectional heating.

The general deformation law is that after the space frame is welded, the four peripheral supports will gradually tilt up freely. If the deformation is large, the arching degree of the original plan will be offset. If arching is not considered, the welding will produce a large deflection value, which will affect the quality requirements for acceptance. Therefore, one-way heating deformation factors should be taken into consideration when constructing the welded ball space frame.

5. Pay attention to the force of the support after the space frame is installed. Some supports are allowed to be welded, some should be free ends, and some need to be limited, so the construction of the space frame supports should  strictly follow the design requirements.