There are several kinds of grafting techniques for threaded 18 vertical reinforcement.

1, no thread, only hot rolled ribbed bar;

2. Joint mode: vertical reinforcement of shear wall, mechanical connection, electroslag pressure welding, binding and overlapping; Frame column, mechanical connection, electroslag pressure welding, the diameter of 18 is too large to be bound and overlapped;

3. Joint position: See11kloc-0/-1/the left figure on the 70th face for the vertical reinforcement of shear wall and the reinforcement at the bottom of seismic grade I and II. Other parts can be spliced at the same elevation, as shown in the upper right corner of face11-170th. For frame columns, the joint area should not be located in the node and stirrup encryption area. Joint area percentage ≤50%.