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外墙外保温看法中的四大根本误区解读
来源: 日期:2019-01-03 发布人:admin

外墙外保温看法中的四大根本误区解读

Interpretation of Four Fundamental Misunderstandings in Outer Wall External Thermal Insulation

一、外墙外保温抗裂机理:柔韧变形量逐层突变、逐层释放应力?

Firstly, the anti-cracking mechanism of exterior insulation of exterior wall: flexible deion changes abruptly layer by layer and releases stress layer by layer?

从实际上讲,将外墙外保温体系各结构层剖开而分立,并将其各局部置于同一实验环境中,树立一个一致的柔韧变形量的权衡目标,应该说,“逐层突变、逐层释放应力”的抗裂机理是可以说得通的。但是,从目前普通使用的外墙外保温零碎而言,这一前提是不成立的。一是外墙外保温各结构层作爲修建物的复合零碎,是有内外层次的全体,不能够剖开而分立,也不能够在同等环境下承受外力冲击或自然界的各种应力变化;其次是作爲零碎的组成资料,其设置变形目标也是不分歧的,如保温层的弹性模量、抹面砂浆的压折比、柔性腻子的柔韧变形量等。既然是不分歧的,也就缺乏同一比拟的根底。因此,目前有的教科书将一抗裂机理普遍宣讲,实爲一种概念模型,细心琢磨起来是站不住脚的。

In fact, the crack resistance mechanism of "layer by layer mutation, layer by layer release stress" can be said to be feasible by dividing the structural layers of external wall thermal insulation system and putting each part of it in the same experimental environment and setting up a consistent trade-off goal of flexibility deion. However, as far as the exterior insulation of exterior wall is fragmentary, this premise is not valid. Firstly, as the composite fragments of buildings, each structural layer of external wall thermal insulation can not be split and separated, nor can it withstand the impact of external forces or various stress changes in nature under the same environment; secondly, as the fragmentary constituent data, its deion objectives are not divergent, such as the elastic modulus of thermal insulation layer, the compression-flexibility ratio of plastering mortar, and softness. Flexible deion of sex putty, etc. Since there are no differences, there is no basis for the same analogy. Therefore, the current textbooks generally preach the anti-cracking mechanism, which is actually a conceptual model, and careful consideration is untenable.

二、外墙外保温零碎结构的最好选择:无空腔?

Second, the best choice of exterior insulation fragmentary structure: no cavity?

外墙外保温体系应优先选用无空腔零碎,以为无空腔零碎相比拟于有空腔零碎而言,其抗风压尤其抗负风压才能强,平安牢靠性更高,似乎已到达了一个共识,现实上不尽然。

External wall insulation system should give priority to non-cavity fragmentation. It is believed that the anti-wind pressure, especially the negative wind pressure, is stronger and safer than that with cavity fragmentation. It seems that a consensus has been reached, but it is not the same in reality.

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三、外墙外保温主材选择的首位要素:导热系数低?

Third, the first factor for selecting the main material of external wall thermal insulation: low thermal conductivity?

由于外墙外保温零碎技术的门槛不高,在规范制定和政策引导上往往将零碎组成资料以及零碎自身别离且存在滞后景象,国际局部设计人员关于外保温技术还没有很好地看法和掌握,关于外保温的一些做法还存在模糊的概念,往往以为选择导热系数低的外保温主材,就是好的外墙外保温零碎,招致设计和施工脱节,加上局部企业的错误引导,也使外墙外保温技术五花八门、良莠不齐。

Because of the low threshold of the fragmentary technology of exterior wall thermal insulation, fragmentary composition data and fragments are often separated and lagged behind in the formulation of standards and policy guidance. International local designers have not yet had a good view and mastery of the technology of exterior thermal insulation, and some practices of exterior thermal insulation still have vague concepts, often assuming that the main material of exterior thermal insulation with low thermal conductivity should be selected. That is, good external wall insulation is fragmentary, which leads to design and construction disconnection, and incorrect guidance of some enterprises, which also makes the external wall insulation technology varied and uneven.

普通地说,外保温外表采用聚合物公用砂浆及柔性腻子等,其防水成绩都能失掉处理;但在透汽成绩上,学术界、使用界争议很大,一个比拟典型的说法就是,XPS板、聚氨酯等资料不透汽,不合适作爲外保温主材,现实上已施行工程也鲜有成功案例。

Generally speaking, the waterproofing performance of exterior insulation can be lost if polymer mortar and flexible putty are used for exterior insulation. However, there is a great controversy in the academic circles and the use circles on the performance of steam permeability. A typical analogy is that the data of XPS board and polyurethane are not vapor permeable, and they are not suitable as the main material of exterior insulation. In reality, there are few successful cases in the project.

四、外墙外保温功用:波动主体墙?

4. External wall thermal insulation function: fluctuating main wall?

在工程理论中,经常听到这样的话语“构造缺乏外墙保温补”,也常常呈现构造不验收或许验收不合格,就间接做外墙外保温的景象,构造工程隐患较大;而间接做外保温时,从经济效果思索,又经常不按标准要求先对构造找平纠偏,给外保温质量也带来了诸多平安隐患,真是“里面溜溜光,外面一包糠”,质量令人堪虑。

In engineering theory, we often hear such words as "structure lacks external wall insulation supplement", and often present the situation that the structure does not accept or fail to pass the acceptance test, so it indirectly does external wall insulation, and the hidden danger of the construction project is bigger. When indirectly doing external insulation, we often think about the economic effect and rectify the structure according to the standard requirements first, which also brings a lot of flatness to the quality of external insulation. The hidden danger is "slipping away inside, a bag of chaff outside", the quality is worrying.

所谓外墙外保温,是指在垂直外墙的表面面上建造保温层。笔者以为,外保温层的功用,仅限于添加外墙保温效能以及由此带来的相关要求,而不应指望这层保温结构对主体墙的波动性起到作用;主体墙,即外保温层的基底,必需满足修建物力学波动性的要求,能接受垂直荷载、风荷载,并能禁受撞击而可以平安运用,还应能使覆于其外表的保温层和装修层得以牢结实定。

The so-called external wall thermal insulation refers to the construction of thermal insulation layer on the surface of vertical external wall. In my opinion, the function of external thermal insulation layer is limited to adding external wall thermal insulation efficiency and related requirements, and should not expect this thermal insulation structure to play a role in the fluctuation of the main wall; the main wall, that is, the base of the external thermal insulation layer, must meet the requirements of the fluctuation of building mechanics, can accept vertical load, wind load, and can be used safely against impact. It should be able to make the insulation and decoration layers on its surface firm.

综上所述有山东广日建材有限公司提供,想了解更多A1级防火保温材料知识,欢迎关注我们的网站.谢谢支持!

In summary, all the above-mentioned materials provided by Shandong Guangri Building Materials Co., Ltd. would like to know more about A1 class fire and thermal insulation materials. Welcome to our website. . Thank you for your support!


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