Protective isolation device for civil engineering construction

The utility model relates to the technical field of civil engineering, in particular to a protective isolation device for civil engineering construction. Comprising a placing frame, two rotating columns are fixedly installed on the inner wall of the placing frame, a main sleeve frame is rotatably connected to the surfaces of the rotating columns, a first-stage sleeve frame is slidably connected to the inner wall of the main sleeve frame, a second-stage sleeve frame is slidably connected to the inner wall of the first-stage sleeve frame, and an auxiliary sleeve frame is slidably connected to the inner wall of the second-stage sleeve frame; limiting strips are fixedly installed on the surfaces of the first-stage sleeve frame, the second-stage sleeve frame and the auxiliary sleeve frame, and an inserting ring is fixedly installed on the surface of the main sleeve frame. According to the protection and isolation device for civil engineering construction, a main sleeve frame, a first-stage sleeve frame, a second-s