The embodiment of the utility model discloses frame girder, be provided with two at least safety rope links on frame girder's the horizontal gird, two at least safety rope links are used for two fixed protection ropes, two protection ropes are used for the lock joint safety rope, wherein, each end at the both ends of horizontal gird sets up at least one safety rope link, so that it is fixed on the horizontal gird two protection ropes are followed the one end of horizontal gird extends to the other end. Constructor shifts up the measured time at frame girder's horizontal gird from this, can be with the safety rope lock joint on extending two protection ropes of whole horizontal gird for constructor shifts up the measured time at frame girder's horizontal gird also can obtain the protection that the safety belt provided, has improved work safety nature.