How to reserve the expansion seam of fire -resistant watering? This article will continue to discuss the last two methods of it.
04 Preferred to expand seam positions
When determining the expansion position, the reasonable arrangement of the vibration process should be considered together. The vibration of the castable insulation materials on the side of the gap should not affect castable of the pouring vibration and the initial hardening. The position of the expansion seam avoids the stress site, the furnace skeleton and the pores of the lining. In areas with complex shapes, such as corners, raised, etc., the expansion that is compatible with its surface should be set on the surface of the raised angle and the curvature radius. Set a “<” expansion seam.
The lining map should show the position and size of the expansion seam of the main part. If the working temperature of the pouring material exceeds 1200℃, it must be set with a expansion seam with a width of more than 3mm, and the ceramic fiber blanket is stuffed in it.
05 Settings of controlling seams
Because the shrinkage can cause cracking, the controlling seam is required at about 200mm in the convex corner, so that the contraction and open cracks can occur in the predetermined, safer parts. The setting of the control seam can be poured into paper, paraffin or thin wooden boards in the scheduled gap, and pouring combustible or lost materials under high temperature conditions. After these combustible materials are burned or lost, the control seam is left.
The controlling seam must be set in the middle of the adjacent nail, and the pink nails from both sides are roughly equal. Set on the continuous curved surface, the surface of the cone, and the tube, and the plane and curved surface that cannot control the risk of contraction should be set. Avoid settings in areas where the expansion seam cannot be set, such as setting the expansion seam in the small pouring surface and the convex angle.
When the work is lined with refractory watering, in order to avoid the water in the watering plate from the calcium silicate insulation board, which affects the intensity of the pouring materials, it should be applied to the part of the contact site of the calcium silicate insulation board and the pouring. Or waterproofing agent. Calcium silicate insulation board is more likely to be damaged. Be sure to hold it lightly when using it. During processing be careful to use steel saws, wooden saws, etc.
