The request for a square tube structure shall comply with the following rules:

1. The vertical distance and degree of vertical pole of single and double row square pipes shall not be greater than 2.1m, and the horizontal distance of vertical pole shall not be greater than 1.6m.

2. The wall connecting pieces (or wall connecting rods) shall be used at regular distance to stop the connection with the building structure, and shall not be removed during the use of square pipes.

3. Cross bridging shall be set along the outer side of the square pipe, and shall be erected and removed simultaneously with the square pipe.

4. When the height of double row fastener type square steel pipe exceeds 24m, transverse diagonal bracing shall be set.

5. The degree frame must be set at the upper part of the top portal, the setting layer of wall connecting parts and the setting place of the protective shed of the portal type square steel tube.

6. The square bamboo tube shall be equipped with a top strut, which shall be tied with the upright to tightly top the horizontal bar

7. When the erection height exceeds 40m and there is wind vortex, wall connecting measures against wind vortex overturning shall be set.

8. The scaffold board must be paved fully and stably according to the width of the square tube. The gap between the scaffold board and the wall should not be more than 200 mm. The protective layer must be set below the scaffold board of the operation layer.

9. Protective railings and toe boards shall be set outside the operation layer according to rules.

10. The square pipe shall be blocked with dense mesh safety vertical network according to the rules.

The square tube can be corroded in incorrect application. After the square tube is corroded, it usually shows that the wall of the square tube becomes thinner, showing some pits and pitting. Detection method of square tube after corrosion:

The basic principle of magnetic flux leakage method is based on the high permeability of ferromagnetic data. The magnetic permeability at the corrosion defect of the square tube is much smaller than that of the square tube. The square tube is magnetized under the effect of an external magnetic field. When there is no defect in the square tube, the magnetic lines of force mostly pass through the steel tube, and the magnetic lines are evenly scattered at this time; When there are defects in the square tube, the magnetic line of force will bend, and a part of the magnetic line of force will leak out of the surface of the steel tube. The existence of defects can be judged by detecting the leakage flux escaping from the surface of the magnetized square tube.

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