For the sake of people's safety and health, the renovation of tunnel fireproof coating projects is always carried out. However, there are basically two reasons for the renovation of tunnel fireproof coating projects: firstly, the old and aging of the original coating; The second is the need for updates. How should we proceed specifically?

Renovation process of tunnel fireproof coating project:

The main difference between the renovation of tunnel fireproof coating engineering and the construction of new base layer lies in the removal of old coating and the treatment of base layer. The selection and construction of fireproof coating are basically the same.

1. Removal of old coating film 

The removal of old coatings requires understanding the degree of aging of the old coatings and the compatibility of the new coatings. For severely aged coatings, they can be soaked in water, rinsed, and removed with a putty knife. The coating surface formed by solvent based fireproof coating is dense and needs to be removed by mechanical methods such as wire brush or electric grinding wheel.

 For projects where the coating has not aged and only needs to be refurbished for renewal, the main consideration is the compatibility between the new and old coatings. Good compatibility only requires cleaning the surface and applying the coating after drying. If the compatibility is poor and the original fireproof coating is prone to peeling and falling off during the re coating process, the old coating should be completely removed according to the above method.

In general, the same polymer film-forming material has good compatibility. The coating formed by solvent based fireproof coating is easy to cover with solvent based fireproof coating, while the situation of water-soluble fireproof coating is more complex. If necessary, a small area trial coating can be carried out on the old coating.

2. Grassroots treatment

Generally speaking, the treatment of old grassroots mainly focuses on strengthening the solidity, strengthening the solidity of the cracked parts according to the degree of cracking, and repairing the cracked parts according to the degree of cracking.

3. Application of fireproof coating

 During the construction of tunnel fireproof coating, the construction plan provided by the manufacturer should be followed to ensure the construction quality, and the coating thickness should meet the design requirements; The fireproof coating should not have any omissions, delamination, hollowing or other defects; Design requirements that meet national standards.

Tunnel fires can easily trap people and make rescue and evacuation difficult. Therefore, it is necessary to use fire-resistant materials for fire protection to buy time for rescue and evacuation. After the tunnel fireproof coating is applied to the tunnel, it has the function of fire prevention and flame retardancy, which can slow down the collapse of the tunnel structure and the spread of fire, providing valuable time for people to evacuate and rescue. Liaoning Tunnel Fireproof Coating