Pre-assembly method: paperback, vertical assembly method, mold assembly method.
(1) the paperback
The paperback method is easy to operate and does not require stable reinforcement measures. No scaffolding is required; Most of the welds are flat welds, which is easy to operate and requires no skilled welders. The quality of the welds is easy to guarantee. It is convenient and accurate to correct and arch.
It is suitable for assembling steel structures with smaller span and greater relative stiffness of components, such as steel columns within 18m in length, skylight frames within 6m in span and steel roof trusses within 21m in span.
(2) vertical assembly method
Vertical assembly method can be more than one assembly; The block covers a small area; No need to lay or set up special assembling operation platform or sleepers, saving materials and working hours; Save turning process, quality is easy to ensure, do not add special for block turning over, reverse transport, in place, stacked lifting equipment, shorten the construction period; The welded joint of the assembled joint or joint of the block can be welded symmetrically on both sides, which can prevent the side bending of the whole block caused by the welding deformation of the prefabricated joint or steel member.
But a certain number of stents should be set; Block alignment, arch is difficult; There are many welding vertical joints in the connection joints of steel members and prefabricated members, which increases the difficulty of welding operation.
(3) use the mold assembly method
Mold refers to the geometric shape or contour of the workpiece model (internal mold or external mold). It has many advantages such as good product quality and high production efficiency. For the plate structure and section steel structure in batches, molds shall be considered for ploughing and assembling.
The assembly mold of truss structure is usually made by connecting two points to a straight line.
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