The utility model relates to a serial communication port, , including pressing from both sides core pattern flue frame construction and interior brace bar structure, two -layer glass steel top layer inside and outside clamp core pattern flue frame construction includes is equipped with double -layered core formula hoop grid -shaped reinforced rib through the adhesion coating between the two -layer glass steel top layer, interior brace bar structure comprises the interior vaulting pole that forms netted grid -shaped structure through the assembly welding, it has the pipe all to weld on the clamp core formula hoop grid -shaped reinforced rib, and the pipe is worn out inner sheet glass steel top layer and is connected with interior vaulting pole tip welding. The beneficial effects of the utility model are that: what adopt is the combined material structure that corrosion resistance pressed from both sides core pattern flue frame construction and interior brace bar structure constitution. The shortcoming that glass steel bomb nature modulus is low, rigidity is poor can effectively be solved to this kind of structure, simultaneously can reinforced glass steel flue bulk strength and rigidity, under same bearing capacity, the dead weight that can alleviate the structure greatly, the dispersible rectangular flue atress of interior vaulting pole prevents that internal stay rod end portion from damaging glass steel wallboard because of the thermal expansion.