The core barrels should go through the full height of the building. The width of the core barrels should not be less than 1/12 of the total height of the tube. When the tube structure is equipped with corner tubes, shear walls or members that enhance the overall rigidity of the structure, the width of the core barrels can be appropriately reduced.

The core barrels should have good integrity and meet the following requirements: the wall limbs should be arranged evenly and symmetrically; holes should not be opened near the corners of the tube body, when it is unavoidable, the distance between the inner wall of the tube corner and the opening should not be less than 500mm and the opening The cross-sectional thickness of the wall; the cross-sectional thickness of the outer wall of the core barrels should not be less than 1/20 and 200mm of the storey height. The bottom reinforcement of the first and second anti-seismic design should not be less than 1/16 and 200mm of the storey height, and it can be added if necessary Buttresses or buttresses.

When meeting the bearing capacity requirements and the axial compression ratio limit (only for seismic design), the inner wall of the core barrels can be appropriately thinned, but it should not be less than 160mm; the horizontal and vertical reinforcement of the tube wall should not be less than two rows In seismic design, the connecting beams of the core barrels should be provided with cross concealed bracing, horizontal joints or reducing the aspect ratio of the beam section to improve the ductility of the connecting beams.