Analysis of Production Problems in the Construction of Space Frame Steel Structure

Analysis of production problems in the construction of space frame steel structure: 　　
1. The production problem of the component 　　

The plate used in the door-type steel frame is very thin, and the thinnest can be up to 4 mm. The cutting method of multi-thin plates should be the first choice to cut with flame instead of flame cutting. Because cutting with flame will produce great wave deformation on the edge of the board. At present, most manufacturers of H-beam welding adopt automatic submerged arc welding or semi-automatic welding. If the control is not good, welding deformation should occur, causing the component to bend or twist.　

　
2. Column foot installation problem　　
(1) Problems with embedded parts (anchor bolts): the overall or layout is offset; the elevation is wrong; the threaded fasteners are not protected. Directly cause the bolt holes of the steel column bottom plate to be misaligned, resulting in insufficient thread length.　　Measures: The steel structure construction unit cooperates with the civil construction unit to complete the embedded parts work, before the concrete is poured. The relevant dimensions and firmness must be reviewed.　　
(2) The anchor bolt is not vertical: the level of the frame column base plate is poor, the anchor bolt is not vertical, and the horizontal error of the embedded anchor bolt after the foundation construction is too large. After installation, the pillars are not in a straight line, and they tend to sway from side to side, which makes the appearance of the house unsightly, brings errors to the installation of steel columns, and affects the structure of the structure, which does not meet the requirements of construction acceptance specifications.　　
Measures: The anchor bolt installation should insist on first leveling the bottom plate with the lower adjusting bolts, and then filling it with non-shrink mortar for secondary grouting. This method is used in foreign construction. Therefore, fixed anchor bolts such as steel bars or angle steel can be used during anchor construction. Weld into a cage shape, perfect the support, or take some other effective measures to avoid the anchor bolt shifting when the foundation concrete is poured.　　

(3) Anchor bolt connection problem phenomenon: the column anchor bolt is not tightened, and the backing plate is not welded to the bottom plate; part of the anchor bolt with 2 to 3 threaded buttons is not exposed.　　Measures: Welded anchor rods and nuts should be adopted; on the outside of chemical anchor bolts, fireproof coatings and heat insulation treatment should be thickened to prevent the anchoring performance from being affected in the event of fire; foundation settlement observation data should be supplemented.