1. High-altitude assembly method
The steel mesh frame is installed by the high-altitude assembly method, which is to first assemble the assembly bracket at the design position, and then use the crane to hang the net frame components (or blocks) to the design position in the air, and assemble on the bracket. This method sometimes does not require large-scale lifting equipment, but the amount of assembled brackets is large, and high-altitude operations are more. Therefore, for high-strength bolt-connected steel mesh racks made of section steel or steel pipe mesh racks with bolted ball joints, some steel mesh racks are currently being constructed using this method.
Second, the overall installation method
The overall installation method is to first assemble the grid on the ground into a whole, and then use the lifting equipment to lift the whole to the design position to fix it. This construction method does not require tall assembly brackets, few high-altitude operations, easy to ensure the welding quality, but the heavy lifting equipment required, the technology is more complicated. At one time, this method was more concerned with the steel grids of ball nodes (especially those with more members such as three-way grids). According to the different equipment used, the overall installation method is divided into multi-machine lifting method, pull rod lifting method, jack lifting method and jack jacking method.
3. High-altitude slip method
In recent years, the truss roof construction has been gradually increased by the high-altitude parallel sliding method. It is especially suitable for projects such as theaters and auditoriums. In this construction method, the net rack is mostly assembled with an assembly platform on the roof of the front hall of the building (it can also be assembled on the stands of the audience hall for assembly). After the assembly of the first assembly unit (or the first section) is completed, That is, it will fall onto the sliding track and slide forward with a traction device for a certain distance. Next, assemble the second unit (or second section) on the assembly platform, and slide forward together with the first assembly unit (or first section) after assembly. The entire grid is assembled and slipped into place.