Block tunnel of small -size falling rocks and cut bamboo formula portal structure

The utility model discloses a block tunnel of small -size falling rocks and cut bamboo formula portal structure, including brim of a hat ring frame, stretch out the entrance to a cave cut bamboo secondary lining, cut bamboo secondary lining and set up between the brim of a hat ring frame and the entrance to a cave, the front end of cutting bamboo secondary lining is connected with brim of a hat ring frame and is set up, the rear end of cutting bamboo secondary lining is connected with the entrance to a cave and is set up, cuts bamboo secondary lining and upward follows its whole surface and laid cushion material layer, cushion material layer is the secondary lining 0 layer. The utility model discloses simple structure, through carrying out the improvement of structure to the portal, if bamboo secondary lining is cut in the setting to set up cushion material layer above that like the expandable polyethylene material layer, the impact of small -size falling rocks to cutting the bamboo lining cutting has effecti