地铁隧道电缆桥架防火涂料的喷涂工艺主要包括以下几个步骤：

The spraying process of fireproof coating for subway tunnel cable tray mainly includes the following steps:

施工准备：

Construction preparation:

清理电缆桥架表面的浮尘、油污等杂质，确保表面清洁。

Clean the surface of the cable tray of floating dust, oil stains and other impurities to ensure surface cleanliness.

对表面非常光滑的桥架进行打毛处理，以增强防火涂料的黏结力。

To enhance the adhesion of the fireproof coating, the bridge with a particularly smooth surface should be roughened.

涂料配制：

Coating preparation:

将水和涂料按照一定比例（如0.75∶1的质量比）混合，用搅拌机搅拌均匀，使涂料成稠浆状。

Mix water and paint in a certain ratio (such as a mass ratio of 0.75:1), stir evenly with a mixer, and make the paint into a thick paste.

若涂料稍稠，可用适量自来水进行稀释，以方便喷涂。

If the coating is slightly thick, it can be diluted with an appropriate amount of tap water for easy spraying.

喷涂施工：

Spray coating construction:

在喷涂前先用搅拌好的料浆在桥架上做间距一定的横向条状厚度标志，作为涂层厚度的参照物。

Before spraying, use the mixed slurry to make horizontal strip thickness marks with a certain spacing on the bridge as a reference for coating thickness.

使用斗式喷涂器配0.4-0.6Mpa的空气压力进行喷涂，涂料须搅拌均匀。

Use a bucket sprayer with an air pressure of 0.4-0.6Mpa for spraying, and the coating must be stirred evenly.

注意喷涂涂料的******遍涂层厚度，一般在1mm左右。

Pay attention to the thickness of the ****** coating for spraying paint, which is generally around 1mm.

施工时从桥架的腰部向顶部（从下至上）进行施工，每次喷涂约5mm厚。

During construction, the construction should be carried out from the waist to the top of the bridge (from bottom to top), with a spraying thickness of about 5mm each time.

待******遍涂层干透后，再继续喷涂第二遍，如此循环，直至达到设计厚度。

After the ***** coating is completely dry, continue spraying a second coat and repeat this process until the design thickness is reached.

涂层修整：

Coating repair:

由于喷涂形成的涂层不够光滑，一般在朂后一次喷涂后，要立即用料浆进行手工补填找平、修整抹光，使涂层表面平整光滑，并确保涂层达到设计厚度。

Due to the insufficient smoothness of the coating formed by spraying, it is generally necessary to immediately manually fill, level, and smooth the surface of the coating with slurry after the last spraying, ensuring that the coating reaches the design thickness.

涂层养护：

Coating maintenance:

涂层养护期一般为28天，养护条件与普通混凝土基本相同。

The coating curing period is generally 28 days, and the curing conditions are basically the same as ordinary concrete.

在养护过程中如果发现涂层有损伤，应及时修补。

If any damage is found to the coating during the maintenance process, it should be repaired in a timely manner.

需要注意的是，不同工程对防火涂料的性能和涂层厚度有不同的要求，南昌桥架厂家施工时应根据具体的设计要求进行操作。

It should be noted that different projects have different requirements for the performance and coating thickness of fireproof coatings. Nanchang bridge manufacturers should operate according to specific design requirements during construction.