Installation technology of super span space frame dome

At present, the development of large-span space frame structure is relatively fast, mainly because it has good integrity, higher safety, steel saving, good seismic performance, light weight of space frame structure, uniform texture, good ductility, good overall stability, and better seismic performance compared with the traditional plane structure.

High altitude bulk method is commonly used to install the bolt-ball joint space frame. This construction method, the process is simple, easy to master, does not need large lifting equipment, the site conditions and installation personnel are not high, so has been adopted by most space frame installation projects.

The installation process

1、components enter the inspection of a ground component assembly, a unit installation, a platform beam installation, a scaffold construction platform installation, other main beam and secondary beam installation, a platform diagonal support reinforcement, a curved beam installation, a unit piece installation, a dome structure installation, welding, grinding, paint repair, inspection and submission.

2、Welding sequence and key points Section 1: welding of integral positioning welding to reinforce a column and embedded parts — welding of main pipe and steel beam — welding of primary and secondary pipes. Section two: integral positioning welding reinforcement of a column and column welding – main pipe and steel beam welding – primary and secondary pipe welding. Section three: integral positioning welding reinforcement of a column to the column welding – pipe and steel beam welding – primary and secondary pipe welding. (1) Cleaning: cleaning rust, oil, water and so on before welding. Prevent gas generation in the welding process, resulting in weld porosity. (2) Welding preheating: when the temperature is less than 0°C, it needs preheating, the preheating temperature is 5O°C ~ 7O°C. Before welding, preheating should be carried out evenly within the range of 100 on both sides of the weld pass. The measurement of preheating temperature should be carried out 50m away from the weld pass.

3、Paint repair steel components in the process of lifting in the inevitable collision of the surface of the paint off or scratch and welding, need to brush the paint, paint off or scratch surface after removing oil can be painted; Welding joint with electric wire brush for rust removal, remove welding slag and dirt around the welding joint, paint repair. Paint Factory spray paint for components.

4、 supporting wheel carrier unload large span steel space frame dome composite reticulated shell adopts “ground, block or block hoisting, high-altitude docking” manner when installation, the main truss, ring truss and the dome of the below set up enough strength and stiffness of the supporting jig, in order to ensure the stability of steel structure installation process in high altitude and the safety of the construction process.