US Patent 8985888 Joint type prefab assembly

A modular connector and modular bolt can be adapted to connect first and second prefabricated building components together. The modular connector can include a recess having a multistage notch structure that can be coupled with protrusions of a modular bolt. The chamber can also include a moveable butting element that is operably coupled with the multistage notch structure, where the moveable butting element can be adapted to move further into the chamber when the modular bolt is received by the multistage recess structure such that a relative position of the second prefabricated building component is adjustable with respect to the first prefabricated building component.