First, the pedestal needs to be made, that is, the pedestal used to support the arch needs two pieces of iron sheets, and then three pedestal slots (the diameter of the circular steel member is larger than the supporting column) are welded on the iron sheets of the pedestal according to an equilateral triangle.

As a support column, three circular steel members with a diameter slightly smaller than the socket of the base are horizontal enough (two support columns need six circular steel members), and they are also welded with equilateral triangles. When welding, the length of steel bar as the welding point of three circular steel structures is1.70m.

Finally, three circular steel structure members with the same diameter as the base socket are selected to make arch members. Should three round bars be made into a certain arch in advance or welded with steel bars by using the principle of equilateral triangle? The arch distance is about 40CM.

Finally, six round steels with the same diameter as the base groove and the length of 10M ***6 are welded at both ends of the circular arch to connect with the supporting column.