1.施工困难带来的质量隐患

1. quality problems caused by construction difficulties

这类材料在实际施工时，对环境的要求和人员的操作水平要求较高，施工时要求温度以5～30℃为宜，低于5°C或高于30℃时要经过厂家现场技术员调整配合比后才能施工。夏秋季时间，大部分施工时环境温度都在30℃上下波动，并且温差较大，需要经常调整配合比。尤其在雨水较多、湿度较大的南方地区，同时在高达180～240m高的烟囱上，施工难度极大。

This kind of material in the actual construction, the demands on the environment and the operating personnel require a higher level, the construction for the temperature to 5 ~ 30 degrees should be lower than 5 DEG C or higher than 30 DEG C after the manufacturers site technician ratio adjustment to construction. During the summer and autumn, most of the construction environment temperature fluctuates at 30 degrees centigrade, and the temperature difference is great, so it is necessary to adjust the mix ratio regularly. Especially in the southern area with more rain and humidity, it is difficult to construct the chimney which is as high as 180 ~ 240m.

施工过程中也极易受温差应力影响，尤其是在炎热的夏季，白天、晚上的温差会较大，白天上午与下午的温差也较大，这样在上午太阳晒到半边烟囱筒体，下午晒到另外半边，这样筒体的受热程度就不一样，温差引起的胀缩就不一致，这就要求在不同季节施工时，工人要控制好温差，这难度是可想而知的。

In the process of construction is easily affected by temperature stress influence, especially in the hot summer, day and night temperature will be greater, the day temperature difference between morning and afternoon is large, so in the morning sun to half of the chimney body, the afternoon sun to the other half, so that the cylinder heating degree is not the same. The temperature difference caused by expansion and contraction is not consistent, this requires construction workers in different seasons, to control the temperature, it is difficult as can be imagined.

2.高载荷风险

2. high load risk

虽然该类材料的密度较小（比重约0.6～1.0)，但总体用量较大，而厂家要求施工后的厚度约为8～10cm，这样折算下来每平方米材料的用量约50kg，如果烟囱基础不好，尤其是旧烟囱改造时，强度远远达不到要求。假设对一个防腐面积达近万平方米的烟囱防腐工程而言，采用耐酸胶泥方案在现有烟囱内壁将增加约480t载荷（而当烟囱通湿烟气后充分吸水时，烟囱所增加的负荷远远超过480t的载荷）。施工中需将如此重的物料通过施工吊笼逐级输送至180～240m高，势必增加施工中的安全风险。因为电厂旧烟囱一般为传统单筒式烟®，钢筋混凝土筒壁与排烟筒未脱开，砖砌排烟筒分段支承牛腿并荷载分段传给钢筋混凝土筒壁，内衬耐火砖或陶土砖，这种基面其附加承载能力有限，禁止采用荷载较大的防腐材料，只能采用轻质且不吸水的防腐材料。另外即使强度可以满足要求，但在施工中，设备的载荷能力也是一个关键的安全要素，有待于进一步考虑核对。而一般老电厂在加装FGD后，场地较紧，运输道路和烟囱底部通道狭窄，大量物料输送将带来工期延误风险。

Although the low density of the material (the proportion of about 0.6 to 1), but the overall amount is larger, and the requirements of manufacturers after the construction of the thickness is about 8 ~ 10cm, so down conversion material per square meter the amount of about 50kg, if the foundation is not good, especially the transformation of the old chimney, strength far not up to request. Assumption on the chimney anticorrosive engineering an anti-corrosion area of nearly 10000 square meters, the acid proof mortar scheme in existing chimney wall will increase about 480t load (when the chimney through wet flue gas after fully absorbing water, increase the chimney load than 480t load). During construction, such heavy materials should be transported to 180 - 240m high gradually through construction suspension cage, which is bound to increase the safety risk during construction. Because the plant is generally the traditional old chimney smoke single tube, reinforced concrete tube wall and the exhaust tube is not disengaged from the brick chimney section and subsection to the support bracket load of reinforced concrete cylinder wall, lined with refractory brick or clay brick, the base of the additional bearing capacity is limited, prohibiting the use of anti-corrosion material load is very large, only the anti-corrosion material is light and water. In addition, even if the strength can meet the requirements, but in the construction, the equipment load capacity is also a key safety factor, need to be further considered. But after the old power plant is installed with FGD, the site is tight, the transportation road and chimney bottom channel is narrow, a large amount of material transportation will bring the delay risk of construction period.