A. The thickness of the excellent layer is 100mm, and then it is flattened. Use the vibrating fork to fork from the outer circumference to the inner fork 3-4 times, which takes 5-10 minutes. Pay attention to the principles of order, cross, and uniformity. Then use a circular flat hammer to vibrate from the center to the outer circumference in a spiral form 2 times, which takes 3-6 minutes. The flat hammer requires the second hammer to press 1/3 of the excellent hammer and does not miss the hammer. After tamping, use a fork to scrape the surface loose by 5-10mm to facilitate the interlocking of layers and prevent delamination.
b From the second floor to the bottom of the furnace, repeat the above operation.
c Use a spirit level and a wooden board to level the bottom of the furnace.