The reinforcement of ventilation duct can ensure the stability of internal static pressure in practical application. If the deflection of pipe wall is 1%, it is necessary to reinforce the ventilation duct. In the process of actual ventilation pipeline reinforcement, it is necessary to select the corresponding reinforcement method according to the pressure and size. The selection of reinforcement method plays a decisive role in the final service life of the ventilation pipeline. In general, the following methods can be used for reinforcement.

山東通風管道加工

Processing of ventilation pipe in Shandong Province

一、拉桿加固

1、 Tie rod reinforcement

在此過程中需要使用鋼彩、套管等材料展開加固，需要在500pa以下對其展開正壓加固。

In this process, steel color, casing and other materials need to be used for reinforcement, and the positive pressure reinforcement should be carried out under 500pa.

二、框架加固法

2、 Frame reinforcement method

該種加固方式可以使用輕鋼龍骨展開加固。

In this way, light steel keel can be used for expansion and reinforcement.

三、抱合加固法

3、 The method of locking reinforcement

其中使用的材料也是輕鋼龍骨，通常應用在較為特殊的管道加固中，其中主要包括在900彎管道、三通管以及悶頭管等。

The material used is light steel keel, which is usually used in special pipeline reinforcement, including 900 bend pipe, tee pipe and bulkhead pipe.

由此可以看出，在通風管道加固施工的過程中，需要根據管道的位置、實際使用情況等方面內容展開加固。除此之外，還可以采用防下垂加固法，這種方式主要對特殊管道展開加固，其中主要包括迂回管道以及變經管道等，避免通風管道在實際應用過程中出現位移以及下垂等情況。

It can be seen that in the process of ventilation pipeline reinforcement construction, the reinforcement should be carried out according to the location of the pipeline and the actual use. In addition to this kind of reinforcement method, it can also be used to prevent the pipeline from sagging.