Middle and upper manhole cover body structure of building structure

The utility model relates to a middle and upper manhole cover body structure of building structure, one side of manhole is fixed with the structure cylinder on the room body, the structure cylinder isa cylindrical structure, annular groove structure has been seted up to the keep (shenglvehao)at a certain distance away on two sections upper and lower cylinders of this cylindrical structure, the circumference body integrated into one piece's of cylinder flange is provided with and constructs at annular groove structure's two upper and lower the edge protrusion in vertical orientation, be provided with counter bore down along structure cylinder axial direction on the cylinder of structure cylinder, the hole site that should sink is close to the one side at edge in the structure cylinder, thelast port of lower counter bore and annular groove structure's lower groove face parallel and level, and the opening has been offered near one side of structure cylinder to the counter bore down, theelastomer install sink dow