Before the construction of the electric furnace bottom dry ramming mass, attention should be paid to clean up the permanent layer residue, dust, iron wire, plastic cloth and other foreign objects. Calculate the knot size, the actual knot thickness is equal to the required knot thickness multiplied by 1.09, and a sufficient amount of ramming mass should be prepared according to the construction furnace slope and furnace bottom size.
After receiving the material, check whether the ramming mass has debris. If it is damp, the debris should be cleaned up. The damp material should not be used, and the knotting equipment such as rammers, pneumatic picks, etc. should be prepared.
The specific construction steps can refer to the following scheme:
1. After shoveling the material flat with a shovel, step on it firmly with your foot to remove the air, insert the steel drill into the material and shake it repeatedly, and then use your foot to keep it solid. The construction thickness of each layer of the ramming mass is 150~ 200mm is appropriate, and then use a knotting tool to ram it 3 times in a spiral shape from the periphery to the center.
2. The method to check the quality of knotting is usually to put a round steel with a diameter of 5mm on the ramming layer and press it down with a pressure of 10kg, and its depth does not exceed 30mm.
3. Steel brazing can be inserted forcefully during site construction, and its depth should not exceed 30mm. The method of knotting the furnace slope is the same as that of the furnace bottom. First, use your feet firmly, and then use the knotting device to ramming. The maximum angle between the furnace slope and the furnace bottom does not exceed 40. Prevent rolling or collapse due to the furnace slope is too large.