5.5　Assembling

5.5.1　Quality acceptance of the welded H-shaped steel shall comply with the requirements in current national standard GB 50205 Code for Acceptance of Construction Quality of Steel Structures.

5.5.2　The furnace top cross beam of the upper steel structure shall not downwarp.The allowable deviation of camber of the furnace top cross beam for which arch is required by design shall be±L/5000，and that of camber of furnace top cross beam for which arch isn't required by design shall be 0-L/2000，thereof L is the span of the furnace top cross beam.This item shall be taken as a dominant item to be accepted before the furnace construction.

Sample size:100%.

Check method:Measuring with taut wire and steel ruler.

5.5.3　There shall be more than 50% of closely fit surface between the steel casing and the column.

Sample size:10% of all contact surfaces，and at least 5 pieces.

Check method:Measuring with 0.3mm filler gauge，with the filling area smaller than 30% and the edge gap not larger than 1mm.