The invention provides a back bolt type stone
curtain wall connecting piece. The connecting piece comprises a support plate fixed with a
keel of a
curtain wall, hanging parts and a back bolt, whereina
curtain wall stone material is fixed at the hanging parts through the back bolt, and the hanging parts are suspended on the support plate through end parts; vertical cylindrical parts are arranged on a
bearing surface of the support plate, notches allowing the cylindrical parts to penetrate through are correspondingly formed in the end parts of the hanging parts, and after the end parts of the hanging parts are pushed to the
bearing surface, the cylindrical parts relatively enter the notches and are clamped at the bent
tail ends of the notches along with the notches; telescopic limiting parts are also arranged at the end parts of the hanging parts and used for limiting the cylindrical parts in the
tail ends of the notches, so that fixation is realized. According to the technical scheme,replacement is convenient, the requirement for
glue line width of the stone material is low, and the connecting piece is applicable to most
engineering conditions; besides, the horizontal
load force borne by the stone material does not completely depend on the width of a
lap joint eave of the hanging part and also depends on meshing of bolts and the notches, the probability of outward slipping ofthe bolts is further prevented through telescopic pin rolls after resilience, and the safety is improved.