Space is fallen grade truss physique and is constructed integrative davit structure of dark abdomen in formula plane, a grade truss is fallen in the space that relates to the building trade does not have the high connection technology field that varies of supporting. Should hang the structure and include that the pole is sewed to dark abdomen formula rectangle post, level, the pole is sewed in the slant, the last lower extreme of two dark abdomen formula rectangle posts is all sewed the pole through the level and is connected, and two levels are sewed and are connected with the slant between the pole and sew the pole, and the both ends that the pole is sewed in the slant link to each other with the inboard of two dark abdomen formula rectangle posts respectively. The utility model discloses link up direct, transition body volume and space occupy for a short time, have both reduced the input of resource, have also saved the engineering space, it is succinct that the davit structure group becomes the form, and the construction strong operability has guaranteed effectively that the space of hoist and mount and welding is opened wide, has simplified not have and supported a construction process who falls grade fracture and link up, can be to the atress characteristics of falling grade position, and when guaranteeing that vertical bearing links up, the continuous sectional rigidity of vertical section, the practicality is strong.