The surface of the formwork is uneven The common place occurs in the circular column formwork around the wall bolt, the reason is the wall bolt plastic casing is too long, plate surface compression after the formwork force is too large, resulting in sag, or the plastic casing is too short, by the nut through the wall bolt extrusion, resulting in the plate surface convex.Another kind of plate surface not phenomenon often occurs in the middle of keel, the main reason foot plate surface stiffness is not enough, deformation occurs after force repair method is: lay the large formwork, the board up, with the grindstone machine will be the board of mortar and demoulding agent polished clean.The protruding part of the plate surface can be flattened by sledgehammer or after baking by gas welding.Go through the sag in the hole of the wall cock, put the basket screw between the plate surface and the longitudinal keel, tighten the nut, push the plate surface back to the original position.After leveling, weld a flat or Angle steel on both sides of the bolt hole to strengthen the rigidity of the plate surface of the circular column formwork.
For the uneven due to the poor stiffness of the surface, the surface should be replaced.Welding crackIt often occurs between the plate and the transverse keel and the surrounding keel.When opening welding occurs at the joint of the plate surface, the mortar in the gap shall be cleaned up, and then baked and smashed with the gas welding side. The whole plate surface shall be filled with welding seam, and then polished with the grinding wheel.When starting welding around the circular column formwork, first clean up the mortar ash, then use the card to clamp the plate surface and the border for repair welding.And the above two problems, is also a common circular column steel formwork, especially used in steel formwork, in fact, not only because the steel formwork is heavy weight, price high, shortcomings and so on can't cutting shape, especially the above problems, this is why circular column wooden formwork will replace circular column steel formwork as the main cause of emerging circular column formwork.
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