There is no pressure on the whole beam, and the roof is directly made, and 160 cm is directly picked

Since there is no pressure on the whole beam, the length of the "whole beam (excluding the part of the cantilever beam)" needs to be at least 2 3 times the length of the cantilever beam, and the main reinforcement of the beam and the load-bearing wall also need to be reliably connected in the structure. Otherwise, there is a potential safety hazard at the end of the cantilever beam when bearing load.

In order to balance the torque, a counterweight is also added to the symmetrical interior. Actually, it's not empty on the outside or inside, so it's no problem.