NEWS
17
2022
-
10
Rust and corrosion protection requirements for communication towers
Author:
1. Anti-rust and anti-corrosion method
All component materials of the steel tower structure (except for the anchor bolts) need to be treated with anti-rust, and the hot-dip galvanizing method is generally adopted, which requires 30 years of corrosion resistance.
2. The thickness of the anti-rust and anti-corrosion layer requires that the thickness of the galvanized layer of the component should meet the following requirements:
(1) The thickness of the component is greater than or equal to 5mm, and the thickness of the galvanized layer must not be less than 86μm;
(2) For components with a thickness of less than 5mm, the thickness of the galvanized layer must not be less than 65μm.
3. Other requirements
The galvanized surface of the component should be practical and smooth, and burrs, tumors and excess lumps should not be allowed at the joint, and there should be no defects such as pickling and iron exposure. The zinc layer of galvanized zinc should be uniform and firmly bonded to the base metal, and not peeled or raised by hammering.
4. Anti-rust and anti-corrosion requirements of foundation bolts and soles of the feet
The bolts exposed to the top surface of the foundation should take anti-rust measures before the installation of the steel tower structure, and properly protect them to prevent the corrosion and damage of the bolts. The gap between the foot plate (flange) of the steel tower column and the foundation is densely packed by fine stone concrete after the installation of the steel tower. After debugging and testing, the foot plate and anchor bolt at the foot of the tower should be closed with low-strength grade concrete and the thickness of the protective layer should not be less than 50mm
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