The surface treatment of Shield segment bolts is very important. The main reasons can be summarized as follows:
Improvement of corrosion resistance:
Shield segment bolts are installed in underground environments and often face challenges from moisture, water and even corrosive chemicals. Without proper surface treatment, bolts are highly susceptible to corrosion and rust, resulting in reduced mechanical properties and tensile strength.
Through surface treatment methods such as hot-dip galvanizing and Dacromet, a protective layer can be formed on the surface of the bolt to effectively isolate moisture and corrosive substances, thereby improving the corrosion resistance of the bolt.
Extended service life:
Corrosion and rust will quickly destroy the surface of the bolt, further eroding its internal structure, and shortening the service life of the bolt. Good surface treatment can significantly slow down this process and ensure that the bolts maintain stable performance during tunnel construction and operation.
For example, hot-dip galvanized bolts can last decades longer than untreated bolts, depending on the environment and maintenance.
Ensure tunnel safety:
Shield segment bolts are an important part of tunnel lining, and the stability of their performance is directly related to the safety of the tunnel. If the bolts fail due to corrosion, it may cause the segment connections to loosen and even cause serious accidents such as tunnel collapse.
Therefore, improving the corrosion resistance and service life of bolts through surface treatment is one of the key measures to ensure tunnel safety.
Improvement of construction efficiency:
Good surface treatment can also reduce the maintenance needs of bolts during installation and use, reducing repair and replacement costs due to bolt failure. This not only saves manpower and material resources, but also improves the overall efficiency of tunnel construction.
In summary, the surface treatment of Shield segment bolts plays a vital role in improving the corrosion resistance of the bolts, extending their service life, ensuring tunnel safety and improving construction efficiency. Therefore, in the construction of shield tunnels, the surface treatment of bolts must be paid attention to and strengthened.
