JPH0227037A - Fire protecting joint structure - Google Patents

Abstract

PURPOSE:To improve fire protecting performance by providing a fire protecting material on the surface of the surface material of a joint including a recessed part provided in the interior part of a side end of a facing material in the structure of the joint where the facing materials butts with each other with a space disposed on the surface of the surface material of the joint. CONSTITUTION:In the structure of a joint C where facing materials 10, 10 butt with each other with a space disposed on the surface of the surface material 20 of the joint, a fire protecting material 30 is provided on the surface of the surface material 20 of the joint including a recessed part 11 disposed in the interior part of the side end of the facing material 10. The facing material 10 is composed of a fire protecting material such as asbestos cement slate, asbestos cement calcium silicate board, ALC board. The fire protecting material 30 is composed of foaming asbestos member, rock wool felt, slate, ceramic fiber felt, fire protecting putty, fire protecting cement and the like. Thereby, flame or heat of high temperature due to the fire is not directly operated on the surface material 20 of the joint, so that a fire protecting performance in the joint C can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a fire prevention joint structure, and relates to a fire prevention structure that improves the fire resistance of so-called joint portions, which are joints between exterior materials on the exterior walls of various buildings. It is related to.

[Conventional technology]

Some houses have an exterior wall structure covered with panel-shaped exterior materials made of asbestos slate, ALC boards, etc. In order to improve the fire retardancy of such panel-structured exterior walls, it goes without saying that the fire retardancy of the exterior material itself must be increased, but it is also necessary to consider the fire retardancy of the joints that form the joints between the exterior materials. There is. For example, fire prevention structures such as joint parts and external walls are certified as fire prevention structures (exterior wall fire protection structure 2nd class heating test product - JIS^1).
301 compliant).

Fig. 4 shows an example of a conventional fire joint structure, in which the exterior materials 1, 1 are placed on the joint material 2, such as studs or rims, with a gap C between them. They are laid so that they butt up against each other. This gap between the external devices ill, the so-called joint C
In this case, the joint base material 2 made of combustible wood, etc., such as the studs mentioned above, will be exposed, so even if the exterior material 1 itself is made of fireproof material, in the event of a fire, the joint material 2 of the joint C portion mentioned above will be exposed. There is a problem that the fire spreads from underground material 2.

Therefore, in the joint structure shown in the figure, 2 to 3 times of fireproofing material 3 such as foamed asbestos material (trade name: Litoflex, manufactured by Nichias Co., Ltd.) cut to match the joint width is placed in the joint C.
After compressing and inserting a sheet to cover the exposed part of the joint material 2,
This fireproof material 3 is filled with a sealant 4 for imparting waterproof properties, etc.
It is designed to prevent the spread of fire.

[Problem to be solved by the invention]

However, in the conventional fire prevention joint structure as described above, there is a problem in that during an actual fire or when a fire protection test is conducted, fire spreads from the joint base material 2 and sufficient fire protection cannot be achieved. This is because, as shown in FIG. 5, when a fire approaches the outer surface of the exterior material 1, the sealant 4 in the joints C is burned and lost, and the exterior material 1 warps and contracts due to high heat. In this case, a gap is created between the fireproofing material 3, which was blocking the joint C and preventing the spread of fire to the joint base material 2, and the exterior materials 1.1 on both sides. The high heat and flames of the fire gradually penetrated the surface of the joint base material 2 exposed through the gap between the fire protection material 3 and the exterior material 10, causing the fire to spread.

Therefore, the conventional fireproof joint structure cannot be said to be a sufficient fireproof structure, and there is a demand for a fireproof joint structure with more reliable fireproofing properties in order to withstand fires and the like over a long period of time.

Therefore, the object of this invention is to solve the problems of the conventional fire joint structure as described above, and to provide a fire joint structure that does not reduce its fire resistance even if the exterior material warps or shrinks. .

[Means to solve the problem]

To solve the above problems, the present invention has a recessed part provided at the inner part of the side end of both side facing materials in the joint part where the exterior materials abut each other at intervals on the joint base material. A fireproofing material is provided on the surface of the subsurface material.

[For production]

The fireproofing material installed on the surface of the joint material covers the recessed part of the exterior material and is wider than the joint width, so in the event of a fire, the exterior material may warp or contract, causing the joint width to expand. In addition, the area below the joint can be sufficiently covered with fireproofing material to prevent the surface of the joint material from being exposed, and it is possible to reliably prevent fire from spreading to the joint material. .

〔Example〕

Next, while referring to the drawings showing embodiments of the present invention,
This will be explained in detail below.

Figure 1 shows an example of a fire joint structure.
A joint base material 20 is arranged on the back surface of the exterior material 10 at the joint C portion where the 0.10 butts meet with a gap between them. As the exterior +A10, various fire-retardant materials used in normal building construction, such as asbestos slate, asbestos cement calcium silicate board, and ALC (autoclaved lightweight cellular concrete) board, are used. Underground material 2
0 is a base structure such as studs, columns, rims, beams, etc. when the above-mentioned exterior material 10 is joined and fixed in various buildings, and the material for the joint base material 20 is general housing, etc. Most of them are made of wood, but they may also be made of synthetic wood.

Step-shaped recessed portions 11.11 are provided at the inner depths of the side ends of the exterior members 10.1'O on both sides. Therefore, the width between both recessed portions 11.11 is formed to be considerably wider than the width between the upper side ends of the exterior material 1010, that is, the joint width. Specifically, the width between the recesses 11.11 is set to be wider than the joint width when the exterior material 10 contracts or expands in the event of a fire. The height of the recessed portion 11 is set to such an extent that a fireproofing material, which will be described later, is buried therein with a sufficient thickness.

A fireproofing material 30 is buried in the surface of the joint base material 20 including the recessed portion 11. In addition to the above-mentioned foamed asbestos, the fireproof material 30 may be a fireproof composition made of rock wool felt, slate, ceramic fire felt, fireproof putty, fireproof cement, or a composition containing various inorganic powder particles. A solid fire-prevention material used in normal building construction is cut or formed according to the shape of the recessed part 11, and this is used as the joint base material 20 including the recessed part 11.
In addition to being embedded in the surface of the joint material 20, the fire prevention material 30 may be formed by applying or filling the surface of the joint base material 20 with a fluid fire prevention material such as fire prevention paint.

A sealant 40 is filled on top of the fireproofing material 30. This sealant 40 covers the surface of the joint C to improve waterproofness, etc., and various sealant materials such as silicone caulking materials (sealants) used in normal joint structures can be used, but in particular , waterproof and H
A flammable material is preferred; for example, a 11 fA paint may be used.

Various flame-retardant paints can be used as the fire-retardant paint 30, and if a foaming fire-retardant paint is used, the foamable fire-retardant paint will foam and expand due to the high heat during a fire.
The fireproofing material 3 expands to the gap between the entire inner part of the recessed part 11 and the exterior material 10 or to the joint C part above the recessed part 11
0, and the excellent heat insulating effect of the foam layer reliably prevents the spread of fire to the joint material 20, further enhancing fire protection.

As the foamable fireproofing paint, various foamable fireproofing paints that are used in ordinary building construction can be used. This disclosure discloses an example of a foamable fireproof paint suitable for use in such fireproof joint structures. The composition of this foaming fireproofing paint is carbonized expansion agents such as dipentaerythritol and penquerythritol, dehydration catalysts such as inorganic phosphates, titanium white, carbon black, talc, calcium carbonate, halide, mica, kaolin, and silica sand powder. and emulsion-type color vehicles such as acrylic resin emulsion, vinyl acetate emulsion, rubber latex, etc., and the paint viscosity is 1.
The culm degree was adjusted to 04 to 10 scps.

When using a fluid foaming paint etc. as the fireproofing material 30, the concave portion 1 is coated by ordinary brushing or spraying.
Although it is possible to apply the paint within the same area, for example, if it is automatically fed using the pressure-feed tantameter method, work efficiency is high, there is less paint scattering to the surrounding area, and a thick paint film can be formed. This is a preferable method from the viewpoint of improving fire protection.

FIG. 2 explains the fire prevention effect of the fire prevention joint structure described above. As in the case of the conventional structure described above, the exterior material 10 contracts or warps due to the high heat and flames of a fire, and the joint C The joint width becomes wider, and the sealant 40 covering the surface of the joint C burns and disappears because it is relatively susceptible to heat. And if it is a conventional fireproof structure,
Fire spreads to the joint base material 20 through the gap created between the fire protection material 30 and the exterior material 10, but in the case of this invention, the fire is buried even wider than the widened joint width to the inside of the recessed part 11. The fire prevention material 30 that is installed prevents the joint base material 20 from being directly exposed, so a fire can
The spread of fire to the joint base material 20 can be reliably prevented.

In the above embodiment, the shape of the recessed part 11 provided in the exterior material 10 may be a trapezoidal step shape, an arcuate shape, in addition to the right angle step shape shown in the figure, if a space wider than the joint width can be formed on the surface of the joint preparation material 20. It can be implemented in any other shape.

For example, FIG. 3 shows a case where a triangular recessed part 11 is provided by cutting off diagonally at the back of the side end of the exterior material 10. Such a triangular recessed portion 11 is easy to process, and there is no fear that the strength and performance of the exterior material 10 will deteriorate due to the formation of the recessed portion 11. In this case, fireproofing material 30
It is preferable to use the above-mentioned foamable fireproofing paint as the material. That is, in the case of the triangular recessed part 11, when the exterior material 10 contracts, there is a slight gap in the diagonal direction between the fireproofing material 30 and the inner wall of the recessed part 11. Therefore, in the event of a fire, it is possible to prevent flames and heat from directly transmitting to the joint base material 20 from the direction perpendicular to the joint C, but there is a possibility that a certain amount of flame and heat may be transmitted to the joint base material 20 through the diagonal gap. Gender remains. However, when a foamable paint is used as the fireproofing material 30, the foamable paint expands when heated, and the diagonal gap can be completely closed, and more reliable fireproofing properties can be achieved. be.

In addition to forming the fireproofing material 30 on the surface of the joint base material 20 including the recessed part 11 of the sheathing material 10, the fireproofing material 30 is further formed on the first layer of fireproofing material 30 between the upper side ends of the sheathing U10, 10. A second N upper firestop (not shown) may also be provided.

As the material for this upper fireproofing material, various fireproofing materials similar to the above-described 1N buried fireproofing material 30 can be freely used. The upper fireproofing material is the exterior material 10 in the event of a fire, such as the fireproofing material 30 mentioned above.
Although the effect of not creating a gap between the two cannot be achieved,
By covering the fireproofing material 30, the thickness of the entire fireproofing material can be increased, and the heat insulation effect and flame blocking effect can be further improved. Furthermore, even if the thickness of the fireproofing material 30 is reduced, sufficient fireproofing properties can be exhibited, so processing of the recessed part 11 in the exterior material 10 and embedding of the fireproofing material 30 in the recessed part 11 are facilitated. This improves the construction efficiency of the entire fire joint structure. Furthermore, by using different materials for the first layer fireproofing material 30 and the second layer upper fireproofing material, it is possible to provide properties that cannot be achieved with a single material.

Among the above fire prevention joint structures, the structure of the 2N upper fire prevention material, sealant 40, etc. other than the 1N fire prevention material 30 buried in the surface of the joint base material 20 is in addition to the above-described embodiments. It is also possible to change part or all of these structures to various structures similar to normal joint structures, or to delete them if unnecessary.

The above-described fire joint structure according to the present invention can be freely applied to joint parts of exterior surfaces of various buildings, such as external walls, ceilings, roofs, and floors of ordinary houses, where fire prevention properties are required. It is possible. Depending on the location where the fireproof joint structure is constructed, suitable materials are used for the exterior material 10, etc., and a heat insulating layer or base layer is laminated on the back side of the exterior material 10, or a decorative material is applied to the surface. It is possible to combine various types of architectural structures that are used in normal building construction, such as installing a

〔Effect of the invention〕

According to the above-described fireproof joint structure of the present invention, the surface of the joint base material is provided with a fireproof material that is wider than the joint width that spreads due to a fire and covers the inside of the recessed part of the exterior material. This can reliably prevent flames and high heat caused by a fire from directly applying to the ground material. Therefore, it is possible to completely eliminate the problem of conventional joint structures where fire spreads from the joint area to the sub-joint material, resulting in a decrease in fire resistance, and it is possible to significantly improve the fire resistance of the joint structure. It becomes possible to improve the fire resistance of the entire building structure.

In addition, since the fireproof material is buried in the recess formed at the bottom of the side edge of the exterior material, the thickness of the joint structure increases and the construction of the joint base material and exterior material becomes easier. There are no problems such as difficulty in recessing of the exterior material and structures other than fireproof materials.
It can be implemented freely in the same way as normal architectural structures. Therefore, the entire construction work is not complicated, and the fireproof joint structure of the present invention can be applied to construction of joints in any construction structure.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment according to the present invention, Fig. 2 is a cross-sectional view of the used state, Fig. 3 is a cross-sectional view of another embodiment, Fig. 4 is a cross-sectional view of a conventional example, and Fig. FIG. 3 is a sectional view of the device in use. 10... Exterior material 11... Recessed part 20... Joint base material 30... Fire prevention material 40... Sealant C
...Section agent Patent attorney Takehiko Matsumoto No. 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. At the joint part where the exterior materials butt against each other at intervals on the surface of the joint base material, a recessed part is provided at the back of the side edge of the exterior material on both sides, and the surface of the joint base material including the recessed part is provided with fire protection. A fireproof joint structure characterized by the provision of timber.