The large furnace is a key part of the glass melting furnace, so the construction of refractory bricks in this part is particularly important. Care must be taken during construction. A construction plan should be formulated in advance and tools such as curved pallets and aluminum alloy rulers should be prepared. Before masonry construction, the installed mortar tires should be inspected to confirm that the supporting structure is stable and firm. The large mortar tires should be able to withstand the load of the bricks and construction workers when the mortar is laid. The arc surface of the mortar tires should be consistent and the arc top should be consistent. The level, as well as the curvature of the wooden formwork and the arch height should meet the requirements of the drawings, and the steel structure can only be laid after passing the inspection. At the same time, attention should be paid to fire prevention. The tire surface is paved with 2mm thick plywood to prevent leakage and facilitate wire laying.
When loading refractory bricks onto a large pile of refractory bricks, they must be placed on both sides at the same time and placed symmetrically to prevent the refractory bricks from tilting due to uneven stress; and the stacking height must not exceed 3 layers. The bricks should be pre-arranged before laying. It is required to pre-arrange and measure the actual size of the mud joints at both ends and the middle of each section of bricks; then calculate the mud joints of each ring according to the actual size of each section, and divide them into 5 rings and one section on the bricks. The sections are marked for easy inspection to ensure that the final locking bricks are laid properly; the expansion joints between each section of bricks are nailed to the bricks with long wooden strips for control; during masonry. The slope of the reafrctory bricks should be flat and the angle should be correct. Do not use the method of thickening the brick joints to level the bricks. Use thin steel plates to fill the bricks that are not close to the beams; the brick structure should be built with staggered joints, and the mud should be full and longitudinal. The joints should be drawn through the masonry lines, and the arc board should be used to check the curvature of the brick surface at any time, and the flatness of the brick surface should be checked with a long ruler; the brickwork structure should be built symmetrically from both sides of the brickwork to the center at the same time, and the small ends of the brickwork should not be missing It is strictly forbidden to turn the edges and corners upside down. The feet of each brick should match the tire. Each brick should be hammered tightly (it is strictly prohibited to use an iron hammer). Every 3-5 rows should be checked. , to prevent the upper and lower surfaces of the bricks from being misaligned; the depth of the locking bricks into the bricks is about 2/3-3/4 of the entire length of the bricks, and the depth of the locking bricks on the same section of the bricks should remain the same. When driving in the lock brick, use a large wooden hammer and leave the temperature measuring hole brick in an accurate position.
After the masonry is completed, the tie bars should be tightened promptly and all temporary fixings should be removed. Usually the height of the bricks away from the tread of the wooden mold is 0.15% of the span of the tread. The tie bars do not need to be too tight. According to experience, sometimes the tie bars are tightened until the tread is separated from the tread mold and the gap is 4-2mm. Before tightening the strip, a tightening plan should be formulated, personnel, equipment, and tools should be prepared, and experienced personnel should be assigned to provide unified command. The number of buckles to tighten each time, the interval, etc. should be arranged in advance and explained clearly. If the tie bars are too tight during the kiln baking, causing many defects such as skin peeling, corner defects, cracks and other defects on the inside of the bricks, the quality of the bricks will be affected and the defective bricks will need to be replaced. During the tightening process, the changes in the diameter should be observed at any time, and any abnormal situation should be dealt with in time. The tire mold can be vibrated only after the bricks have been separated from the tread and there is no change after 12 hours. Finally, check the construction quality of the large tiles. If the big and small heads are upside down, the tiles are damaged or cracked, or the head seams are too large, they should be replaced and rectified in time.
In actual construction, the phenomenon of large refractory bricks being drawn after baking in the kiln also occasionally occurs. The cause may be that the big and small ends of the bricks are upside down without being checked; or the mud joints are too large during the masonry; it may also b
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