The utility model belongs to the technical field of tunnel preliminary bracing construction, concretely relates to steel bow member jacking strutting arrangement of tunnel hunch portion. The utility model discloses a hydraulic jack evenly is equipped with 3 supporting slanting pole around the support of hydraulic jack's bottom, linked firmly 1 vertical connecting rod at hydraulic jack's top, and the connecting rod top has linked firmly a width adjustable U type groove. The utility model discloses a steel bow member of tunnel hunch portion is installed and is provided convenient, if the flower steel encircles (grid steelframe), I -steel shaped steel etc. When installing, only needs put I -steel or grid steelframe on it, can automatic jacking to the height that needs, conveniently assemble, overcome that the tradition leans on that the manual work is shouldered, intensity of labour greatly, the big defect of danger, practiced thrift the manpower, the security has improved, U type groove is adjustable width simultaneously, and the grid steelframe jacking of convenient different model I -steel, different specifications is supported.