1.During the construction of the main structure, according to the position of the design drawings, the holes for the ventilation flue are reserved, and the size of the holes should be 50-80mm larger than the outer dimensions of the components. The steel bars in the reserved holes should also be reserved at the same time.
2.Before installation, according to the size of the ventilation flue, hang the vertical line from the top hole to ensure the verticality of the flue during installation.
3.When installing the first floor, first use 1:2 cement mortar to level the ground. After the first section of the pipe seat is grouted, pour C20 concrete with a height of about 40cm in the pipe; after the concrete is finally set, the upper ventilation flue is installed.
4.First, the lower mouth of the connecting piece should be slurried at the mouth of the lower flue baffle, and its four sides should also be sealed with the slurries. The ventilation flue shall be treated as a layered support. Construction method: After the upper and lower pipes are aligned with the slurry, the interface of the upper and lower ventilation flues is generally located at the floor. Therefore, Ф12 steel bars are welded at the pre-embedded steel plates at the root of the pipes and welded with the reserved steel bars in the holes, and are supported on the base of the floor.