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The construction process of refractory plastics needs to be carried out in strict accordance with the design requirements. The following are the specific construction steps:
1. Construction preparation
Before starting construction, it is necessary to conduct a comprehensive inspection of the furnace steel structure, baselines, holes, and other parts. Construction can only be carried out after passing the inspection. The construction department should clean up debris in and around the furnace and transport air compressors, construction tools, scaffolding, etc. to the site. The air compressor must be connected to the power supply and tested to run normally.
Fire-resistant plastic blanks should be stored in a cool warehouse. Their plasticity should be checked before construction, and construction can only proceed if they meet the requirements. If the ambient temperature is lower than 10℃, cold protection measures need to be taken.
Close cooperation between various types of work is required during the construction process. Once construction begins, it must be carried out continuously without interruption. Cover the knotted surface with plastic sheeting to prevent dehydration if interruption is necessary.
2. Ramming construction
When pounding the refractory plastic furnace wall, the blanks must be laid out tightly and flat, and only one layer of blanks is allowed. Tamping construction generally uses a tamping machine, whose impact energy and impact frequency are slightly smaller. Because it contains more water than refractory ramming materials, it can also be tamped densely.
During ramming construction, the hammerhead should walk along the length of the furnace wall, and the hammerhead surface should overlap by about 1/4. After pounding the entire surface of the blank 2 to 3 times, the next layer of blank can be laid in staggered seams, and then continue pounding, and so on.
When encountering anchor bricks, pound the furnace wall plastic to the upper surface of the anchor bricks, dig out part of the material at the location where the bricks are installed, place the stamping mold, and drive it into the plastic. When the size of the anchor bricks is reached, The stamping mold is removed and the anchor bricks are installed. This allows the anchor bricks and the refractory plastic to be tightly engaged to prevent the spread of fire and the furnace wall from tilting inward or collapsing.
When holes are encountered, they need to be laid in layers and sections. During the construction process, the filling materials should be placed according to the designed expansion joint positions, and the surroundings should be carefully pounded and compacted.
When pounding the refractory plastic stove top, set up the template first, then pound it tightly, and so on.
3. Treatment of lining working surface
The treatment of the working surface of the refractory plastic lining mainly includes surface dressing, stripping, pricking the vent holes cutting expansion joints, etc. This work is best carried out simultaneously with the ramming construction process. If the surface becomes dry, it can be moistened with water spray before treatment.
When pounding refractory plastic furnace walls, there is generally no template, so the lining is thicker than the designed size, and the excess part must be cut off with a trimmer. This is surface trimming. The cut-out plastic, if not dry, can be used on the inside of the working layer.
The surface of the stovetop and holes will be smooth after the mold is removed, so use a wire brush to remove the hair to expose the internal pores to facilitate the removal of moisture.
On the surface of the refractory plastic lining, use a breathable needle, a φ4mm steel drill, to drill exhaust holes perpendicular to the working surface. The depth of the holes is about 1/3 of the thickness of the lining, and the center spacing of the holes is 150~250mm. Another function of this hole is to buffer the rapid expansion of the lining body and prevent cracks or peeling.
4. Quality inspection and acceptance
After the construction of refractory plastics is completed, quality inspection and acceptance are required. Inspection and acceptance should be attended to by personnel from design, construction, supervision, quality inspection, and other aspects. The acceptance content should include the following aspects:
1. Whether the construction complies with the requirements of the design and construction drawings, whether the structure is complete, and whether there are any defects such as cracks, fragmentation, and falling off.
2. Whether the construction is carried out according to the technological process, whether the material quality meets the requirements, and whether the construction tools meet the technical specifications.
3. Whether the construction site is clean and tidy, whether cold protection measures are in place, and whether safety production requirements are met.
4. Whether the ramming construction is dense, whether the anchor bricks are fastened, whether the holes are properly processed, whether the surface treatment is smooth and standardized, and whether the expansion joints and exhaust holes are standardized.
5. Whether the quality inspection results meet the requirements and whether all indicators are qualified.
6. Whether the construction records are complete, true, and accurate, and whether they are organized and archived as required.
After the above inspection and acceptance, if it is unqualified, it should be rectified in time and re-inspected until it is qualified.
To sum up, the construction process of refractory plastics includes construction preparation, ramming construction, processing of lining the working surface, quality inspection and acceptance, etc. During the construction process, construction must be carried out in strict accordance with the requirements of design, construction drawings, and technical specifications, and close cooperation with various types of work must be carried out to ensure construction quality and safe production. At the same time, the construction site should be clean and tidy, and cold protection measures should be in place to ensure construction quality and safe production.
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