Girder steel joins externally cage

The utility model relates to a girder steel joins externally cage, include: the external cage body that supplies the people to stand, including the installation face, with the installation facial features right leading flank and be connected left surface and the right flank between installation and leading flank, supply the external cage body of drawknot to hang a pair of connecting rod of locating the girder steel, a pair of connecting rod transversely is fixed in the top of installation face, and a pair of card that supplies the card to hold steel flange board holds the piece, and a pair of card is held the piece and can be dismantled through a pair of connecting piece and connect in a pair of connecting rod. The utility model discloses installation and dismantlement that the girder steel can the conveniently joins externally the cage body to it is different to have solved invar roof beam section size, the poor difficult problem of girder steel joins externally cage week transsexual, the influence that prod