JPH0122814Y2 - - Google Patents

Description

[Detailed description of the invention] This invention mainly relates to the improvement of fireproof partition walls provided in steel frame high-rise buildings.

Conventionally, as shown in Fig. 4, the above-mentioned fireproof partition wall has been made by attaching a flat lath 2 to the inside of a lightweight steel stud 1, and applying water to the lath surface by adding an inorganic binder to inorganic fibers. Wet-sprayed fireproof partition walls are often used, in which a fireproof layer is formed by spraying a fireproof coating material prepared by kneading.

The fireproof partition wall with the above structure has excellent structural strength because lightweight steel is used for the studs, but there are problems with fire resistance when one side of the partition wall is heated due to a fire, etc. There is.

That is, when the fireproof partition wall is heated from one side, the heat is transferred to the lightweight steel frame that is the stud by conduction from the heated surface;
This can be caused by radiation from the heating surface or by convection within the hollow part of the wall, but in structures where the lightweight steel frames that are the studs are exposed inside the hollow part, they are directly affected by the heat transfer mentioned above. As a result, the temperature of lightweight steel frames tends to rise, which causes a corresponding decrease in fire resistance.To compensate for this, the sprayed layer of fireproof coating material is thickened.

This invention solves the above-mentioned problems by covering the surfaces of the lightweight steel frames, which are studs, with a fire-resistant coating in the structure of the fire-resistant partition wall.

This invention will be specifically explained below based on drawings showing an example of its implementation.

In FIGS. 1 and 2, 1 is a stud of a lightweight steel frame, 2 is a flat lath, and 3 is a fireproof layer of a fireproof coating material, and the surface of the lightweight steel frame that is the stud 1 is coated with the same fireproof coating material. A sprayed fireproof layer 4 made of a fireproof coating material is formed integrally with the sprayed fireproof layer 3 on the surface of the lath.

The fire-resistant layer on the surface of the lightweight steel frame, which is the stud, can be formed by, for example, spraying a fire-resistant coating onto the lightweight steel frame after attaching the flat lath 2 to one side, or applying a fire-resistant coating to the lightweight steel frame before attaching the flat lath to both sides. It can be easily formed by spraying.

As described above, according to the structure of the fireproof partition wall in which the fireproof layer 4 of the fireproof covering material is formed on the lightweight steel frames that are the studs, unlike a plate material having fine air bubbles such as a gypsum board, the fireproof layer 4 contains relatively large air bubbles that are included during the spraying process, so the heat transfer mentioned above is further alleviated, which is effective in suppressing the temperature rise of the lightweight steel frame, and therefore the fire resistance of the fire resistance layer 3. The required wall thickness can be reduced.

The graph in FIG. 3 shows the results of a fire resistance test conducted on the fireproof partition wall of the above embodiment and the conventional fireproof partition wall of FIG. 4.

In this fire resistance test, the partition wall is heated from one side and the temperature of the back side of the steel frame and wall material is measured.The temperature of the heated surface is shown as a standard heating curve. The fire-resistant performance curve of the fire-resistant partition wall (the thickness of the fire-resistant layer on the lath is 20 mm), B is the fire-resistant performance curve of the conventional fire-resistant partition wall (the thickness of the fire-resistant layer on the lath is 25 mm), and C is the fire-resistant partition wall of the above example ( The fire resistance performance curves of the fire resistance layer (thickness 20 mm) on the lath are shown. Moreover, the M line indicates the temperature limit of the stud portion.

As shown in the fire resistance test result graph above, for conventional fire resistant partition walls, the fire resistant layer thickness of A is 20
In the case of mm, the limit temperature is 400℃ (average value) with 2 hours of fire resistance.
However, in order to pass the test, a thickness of 25 mm was required as shown in (b).
As shown in C, it was confirmed that the fireproof partition wall of the above example passed the test with a fireproof layer thickness of 20 mm.

In addition, the fireproof layer 4 on the surface of the lightweight steel frame that is the stud
As with the fireproof layer 3 on the lath surface, it can be easily formed by simply spraying the same fireproof coating material, so the construction period is almost the same compared to conventional fireproof partition walls, and the required time is Construction costs can also be kept to a minimum.

As mentioned above, according to this invention, lightweight steel frames are used as studs, laths are pasted on both sides of the studs,
In a fireproof partition wall in which a sprayed fireproof layer of a fireproof coating material is formed on the lath surface, a sprayed fireproof layer of the same fireproof coating material as the fireproof coating material on the lath surface is formed on the surface of the lightweight steel frame that is the stud. Therefore, the fireproof layer of the lightweight steel frame that is the stud and the fireproof layer of the lath surface can be formed in a series of spraying steps using the same fireproof coating material, making the construction extremely simple and quick. Furthermore, since the fireproof layer of the lightweight steel frame that is the stud is formed of the same fireproof coating material as the fireproof layer on the lath surface, it has the effect of preventing it from falling off or peeling off. This has a remarkable effect in alleviating the temperature rise of the lightweight steel frames that serve as the studs, thereby making it possible to reduce the thickness of the fireproof covering wall required for fireproof performance.

[Brief explanation of drawings]

Figure 1 is a cutaway perspective view of the main parts of a fireproof partition wall showing an embodiment of this invention, Figure 2 is a cross-sectional view, and Figure 3 is a cross-sectional view.
The figure is a graph showing a fire-resistant performance curve, and FIG. 4 is a cross-sectional view of a conventional fire-resistant partition wall. 1... Stud, 2... Flat lath, 3... Lath fireproof layer, 4... Stud fireproof layer.

Claims (1)

[Scope of utility model registration request] In a fireproof partition wall made of lightweight steel frames as studs, laths pasted on both sides, and a fireproof layer of sprayed fireproof coating material formed on the surface of the laths, the surface of the lightweight steel frames serving as the studs is coated with the same fireproof coating material as the fireproof coating material. A fire-resistant partition wall characterized in that a spray-on fire-resistant layer made of a fire-resistant coating is formed integrally with the spray-on fire-resistant layer on the lath surface.