In steel structure, JM usually refers to the connection module in construction drawing. Connecting modules occupy a vital position in the whole steel structure, they play the role of connecting and fixing steel members, so that the whole steel structure can stably support the weight and resist external forces such as wind pressure and earthquake. Therefore, in the design and construction of steel structures, the selection and installation of connection modules need to be carefully considered.

JM can also refer to the angle code in steel structure, usually made into L-shape or C-shape, to reinforce the connection points and support points of the structure. Angle codes in steel structures are very common in fixing and supporting steel members, which can effectively improve the strength and stability of structures. At the same time, the selection and installation location of angle code also need to be evaluated and designed according to the specific situation.

In addition to connecting modules and corner codes, JM can also refer to managers in steel structures. These personnel usually have rich experience in steel structure construction and management and can provide important support and guarantee for the whole steel structure construction process. They usually need to have the ability of teamwork and project management experience to ensure the smooth construction and safe operation of steel structures.