Openable floor hole protection device

The utility model discloses an openable floor hole protection device which comprises a lining cylinder extending into the end of a floor hole, a neck bush is sleeved outside the lining cylinder, the circumferential outer wall of the neck bush is matched with the inner wall of the corresponding position of the floor hole, and the lining cylinder and the neck bush are fixedly connected to a supporting template at the position of the floor hole through bolts. The end, located outside the floor opening, of the lining cylinder is connected with a tunnel portal in a pivoted mode. According to the utility model, the aims of preventing the deformation of the tunnel portal, improving the safety of constructors, adapting to floor holes with different inner diameters and improving the adaptation capability are fulfilled. The utility model is suitable for the technical field of floor hole construction. 本实用新型公开了一种可开启式楼面洞口防护装置，包括伸入楼面洞口端部处的内衬筒，于所述内衬筒外套装有内衬套，所述内衬套的周向外壁适配于楼面洞口相对应处的内壁，且内衬筒和内衬套经螺栓固连于楼面洞口处的支护模板上，于所述内衬筒位于楼面洞口以外的一