Stone curtain wall hidden drainage pipe structure based on BIM

A stone curtain wall hidden drainage pipe structure based on BIM is arranged in a curtain wall light steel keel, the outer side of the curtain wall light steel keel takes a curtain wall granite plate as a veneer, the inner side of the curtain wall light steel keel takes a silicic acid cover plate as a veneer, and the curtain wall light steel keel comprises a vertical square tube main keel and an angle steel secondary keel arranged on the vertical square tube main keel; the space between every two adjacent vertical square tube main keels is filled with heat preservation rock wool, galvanized steel plates are laid on the two sides of the heat preservation rock wool, the curtain wall granite plates are connected with the angle steel auxiliary keels through stone hanging pieces, drainage pipe limiting grooves are reserved in the heat preservation rock wool on the outer side, and the galvanized steel plates meet the fracture surfaces of drainage pipes to form drainage pipe installation channels. The drain pipe is