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钢结构防火涂料施工工艺

发布时间:2015-8-27 11:05:30 浏览次数:1143
施工前准备

按照钢结构防火涂料施工方案的规定,防火涂料施工前应对基材表面按要求进行除锈、防锈处理,务求全面彻底,防火涂料施工前还对基材表面作尘土,油污等杂质清除,采用高压气体或用高压水枪进行表面除尘清理,待基材表面无水进行除尘、除杂物、油污等检查合格后方可施工防火涂料。

1.待涂表面的处理:在施工之前,应将支承构件表面处理干净(包括除锈、清除焊渣及其它污物);检查钢结构表面有无漏刷防锈底漆的现象,及时修补。

2.防火涂料的储存:经检验合格的涂料,应存放在干燥通风的仓库内。应将涂料摆放整齐,防止风吹雨淋、阳光暴晒,如结块变质的涂料,不得使用。

防火涂料的施工

1.采用喷涂方式。

2.涂装施工:钢结构防火涂料施工前应充分搅拌均匀后方可施工使用,施工第一遍后,表干后18-24h进行第二遍施工,以后各遍施工,涂层厚度应根据需求控制,直至达到规定厚度。每次施工时间间隔为18-24小时以上,施工环境温度为0-40℃。基材温度为5-45℃。空气相对湿度不大于90%,施工现场空气流通,风速不大于5m/S,室外作业或施工构件表面结露时不宜施工。

3、防火涂料喷涂:喷涂底层料,为提高涂料与钢梁基层的粘结强度,应在底层的浆料中添加少量的水性胶粘剂。涂层表面有明显的乳突、凹坑,应用抹刀修平。喷涂前应进行试喷并制作样板。通过试喷确定喷涂气压、喷距、喷枪移动速度等工艺的最优参数,并经监理用标准样板比对确认后,方可进行大面积喷涂。喷涂时,喷枪要垂直于被喷钢构件表面,喷距6-10毫米,保持在0.4-0.6MP,喷枪运行速度要保持稳定,不能在同一位置久留,避免造成涂料堆积和流淌。喷涂过程中,配料及往喷涂机内加料均要连续进行,不得停留。底层涂料表面干燥后(底层涂料施工24小时后),方可进行面层涂料的喷涂,对于明显凹凸不平处,应用抹刀进行抹平处理,以确保涂层表面均匀光洁。


Construction preparation

In accordance with relevant provisions of the steel structure construction scheme of fire retardant coating, before construction to deal with fire retardant coating substrate surface derusting, antirust processing, in accordance with requirements to thorough, before construction and fire retardant coating to the substrate surface dust, oil and other impurities removed, the use of high pressure gas or surface dust cleaning with water cannons, to base material surface without water, dust and debris, oil and other fire retardant coating inspection qualified rear can construction.

1. To be coated on the surface of the treatment: before construction, supporting member should be clean surface treatment (including cleaning, removal of welding slag, and other contaminants). Check whether there is any leakage brush anti-rust primer on steel structure surface phenomena, timely repair.

Of fire retardant coating 2. Storage: after the inspection coating, should be stored in dry and ventilated warehouse. Coating should be neat, prevent wind blowing rain, sun exposure, such as caking metamorphic coating, shall not be used.

Construction of fire retardant coating

1. With spray.

2. Coating construction: steel structure fire-retardant coating construction should fully stir well before the rear can use, construction for the first time, after 18 to 24 h after table dry construction for 2 times, each time after the construction, coating thickness should be based on demand control, until the required thickness. Every time the construction time interval for 18 to 24 hours, the construction environment temperature is 0 to 40 ℃. Substrate temperature for 5-45 ℃. Air relative humidity is not more than 90%, the air circulation to the construction site and the wind speed is not more than 5 m/S, outdoor work or construction component surface condensation when crossing construction.

3, fireproof paint coating: coating layer material, for improving the coating bond strength and steel base, should be in the bottom of the slurry to add a small amount of water-based adhesives. Coating surface has obvious mastoid, pits, application spatula ponder. Should be done before spraying test injection and production model. By spraying pressure, spraying distance, spray gun, spraying determined movement process of optimal parameters, such as, and confirmed by the supervision model than using a standard, can for extensive spraying. Spraying, the spray gun should be perpendicular to the surface being sprayed steel members, gush from 6 to 10 mm, keep in 0.4 0.6 MP, gun running speed to remain stable, can't stay in the same position, avoid to cause coating accumulation and flowing. Spraying process, ingredients and the sprayer are conducted to continuous feeding, must not stop. Underlying coating surface after drying (bottom coating construction after 24 hours), may the spraying of paint on the surface, for obvious uneven, application spatula smoothing processing, in order to ensure uniform coating surface smooth.



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