What does the rafter mean in fortune telling?

Raft is a kind of building wood. Rafters, also called rafters, are fixed on beams to support tiles.

The common roof structure of wooden houses consists of roof truss, bucket arch, purlin, rafters and hanging tiles.

Structure of barrel-penetrating wood

It is widely used in buildings in the south of China. Its basic components are columns and penetrations (also called penetrations). Doutong wood structure is a column along the depth direction of the building, and the stigma directly supports the purlin.

The main differences between it and the beam-lifting wood structure are as follows: ① The column head directly supports purlins, so it has higher bearing capacity than the beam-lifting wood structure and does not need to transfer loads through beams; (2) There are many landing columns with dense column spacing; (3) The columns in the single-seam building frame are connected into a whole through purlins that run through the columns.

The pillars of bucket wood structure gradually increase from front to back to the center (roof ridge) along the depth direction, forming an arc roof similar to beam wood structure. In the bucket-type wood structure, because the load borne by the column is much smaller than that of the beam-lifting structure, the diameter of the column is also reduced accordingly, which plays the role of small-diameter wood, which is not only economical in materials, but also lighter in posture.