JP5317785B2 - Fire spread prevention structure in outer heat insulation structure - Google Patents

Description

  The present invention relates to a fire spread prevention structure in an outer heat insulating structure.

  As described in Patent Document 1, an outer heat insulating structure in which a heat insulating material made of synthetic resin foam is installed on an outer wall surface of a building frame and the surface thereof is covered with a nonflammable surface material or mortar It is popular. In order to cover the entire building with a heat insulating material without any gaps, the air conditioning efficiency is increased, and there is an effect of protecting the building from the outside air.

  As an outer heat insulating structure, it has also been proposed to use an outer heat insulating precast plate. Patent Document 2 discloses an outer wall molding as an outer heat insulating precast plate capable of preventing the spread of heat insulating material in an adjacent outer heat insulating precast plate in the event of a fire. An outer heat-insulating precast plate is described, which is composed of a plate, a foam-type heat insulating material, and an inner wall molded plate, and is provided with a refractory material such as a Keisan calcium plate on the upper end surface of the foam-type heat insulating material.

  In a conventional outer heat insulating structure, a heat insulating material made of a synthetic resin foam subjected to a high fire resistance treatment is often used as a heat insulating material layer. However, when a fire occurs in a building, carbonization and dissolution may occur if the heat insulating material is a thermosetting resin such as urethane resin or phenol resin. In addition, when the heat insulating material is a thermoplastic resin, it may be dissolved and reduced. When such volume reduction occurs, a space is formed in the heat insulating material layer, and there is a fear that hot air may spread from the lower floor to the upper floor due to the chimney effect, which is a problem to be solved.

  In the outer heat insulating precast plate described in Patent Document 2, the fireproof material is disposed on the upper end surface of the foam heat insulating material, thereby preventing the expansion of the foam heat insulating material on the upper heat insulating precast plate. doing.

JP 2002-364095 A JP 2004-162471 A

  In the conventional heat insulation structure of the above-described known form, special measures are taken against the spread of hot air due to the chimney effect caused by the volume reduction of the heat insulating material made of synthetic resin foam that may occur in the event of a fire. Not. In the outer heat insulating precast plate described in Patent Document 2, the fire spread prevention effect is achieved by disposing a refractory material on the upper end surface of the foam heat insulating material. However, if the foam insulation is reduced by heat and lost, etc., the position of the refractory material located on it becomes unstable, and there is a risk that a hot air passage will be formed by falling. is there.

  The present invention has been made in view of the above circumstances, and in the outer heat insulating structure, even when the heat insulating material made of synthetic resin foam is reduced by heat and lost, etc., the upper and lower heat insulating materials Non-combustible refractory material placed between the two floors prevents inadvertent falling, thereby effectively preventing hot air from spreading from the lower floor to the upper floor due to the chimney effect. It is an object of the present invention to disclose a fire spread prevention structure.

  The fire spread prevention structure in the outer heat insulating structure according to the present invention includes at least a structure in which a back surface mortar layer, a heat insulating material layer, a surface mortar layer, and a finishing material are laminated in this order on the outer surface of a building frame. It is a fire spread prevention structure in the structure, wherein the foamed resin heat insulating material layer is composed of a heat insulating material made of synthetic resin foam arranged in a plurality of stages in the vertical direction, and is positioned at the lower part of each stage or any stage At least the upper end surface and both side surfaces near the upper end surface are covered with a mesh-like inorganic material, and an incombustible refractory material is placed between the lower heat insulating material and the upper heat insulating material. It is characterized by having at least the configuration described above.

  In the outer heat insulating structure according to the present invention, the mesh-like inorganic material disposed so as to cover at least the upper end surface and both side surfaces in the vicinity of the upper end surface of the heat insulating material positioned at the lower side has the back surface mortar layer and the surface mortar. Even if the heat insulation material is reduced in volume or disappears in the event of a fire, the mesh-like inorganic material can remain in its original position, so that it is placed on it. Incombustible refractory material can also maintain its original position. That is, even if the lower heat insulating material disappears, the incombustible refractory material does not fall. Therefore, a new hot air passage is not formed, and it is possible to reliably prevent the hot air from spreading from the lower floor to the upper floor due to the chimney effect.

  In the present invention, an inorganic heat insulating material such as glass wool, rock wool, calcium carbonate, or the like can be used as the noncombustible refractory material. If there is a large gap between the upper and lower heat insulating materials, a heat flow path may be formed and heat insulation breakage may occur, so it is not necessary to provide a wide joint from the structure of the building. However, it is desirable to use a fire-resistant foam material that is usually in the form of a tape but foams by heat to form a highly heat-insulating material layer in the event of a fire. An example of such a fireproof foam is Fibrok (registered trademark: Sekisui Chemical Co., Ltd.).

  Depending on the building, for the purpose of improving earthquake resistance, it may be required to provide a wide joint part in a part of the outer heat insulating structure. In that case, it is desirable to use a non-combustible refractory material having a large volume such as rock wool. At that time, in order to further stabilize the position of the incombustible refractory material, in the horizontal joints, the heat insulation located between the lower heat-insulating material and the incombustible refractory material and between the incombustible refractory material and the upper order. It becomes a preferable aspect to set it as the structure by which the end surface mortar layer is provided between materials.

  In addition, the horizontal joint has been described so far, but also in the vertical joint, at least the side end surface of the heat insulating material and both side surfaces in the vicinity of the side end surface are covered with a mesh-like inorganic material, and the left and right heat insulating materials are adjacent to each other. It becomes a preferable aspect to arrange | position the said nonflammable refractory material between. Furthermore, it becomes a more preferable aspect to provide an end face mortar layer between the heat insulating material located on the left side and the non-combustible refractory material and between the non-combustible refractory material and the heat insulating material located on the right side. By setting it as such an aspect, the fire spread of a horizontal direction can also be prevented effectively.

In the present invention, the heat insulating material constituting the heat insulating material layer is preferably a synthetic resin-based foam, and examples of the resin material include polystyrene-based resins, polyethylene-based resins, polyurethane-based resins, and the like. What is necessary is just to determine the expansion ratio in the case of using a resin foam suitably according to the heat insulation performance required. More preferably, it is a foamed polystyrene product having a density of 10 to 40 kg / m ³ .

  In the present invention, the back surface mortar layer is for the purpose of ensuring adhesion between the outer surface of the building frame of a building that is, for example, a concrete wall and the heat insulating material, and affixing the heat insulating material flatly. Adhesive resin mortar is used. The back surface mortar layer is preferably provided on the entire surface between the outer surface of the building frame and the heat insulating material, but may be partially provided if the object can be achieved.

  In the present invention, the surface mortar layer is for protecting the outer surface of the heat insulating material and ensuring stable attachment of the finishing material. As the mortar to be used, for example, an acrylic resin is mixed with cement. Resin mortar. In addition, an admixture for cement mortar such as vinyl acetate resin and cellulose resin can be used.

In the present invention, the mesh-like inorganic material is made by weaving or knitting one or more kinds selected from glass fiber, carbon fiber, alumina fiber, silica fiber, polytyranocarbosilane fiber, carbosilane fiber, etc. And a sheet or band-like body. It is preferable to use an alkali-resistant fiber for the fiber itself because the mesh-like inorganic material is not affected by the alkali component of the mortar. There is no particular limitation on the opening size of the mesh-like inorganic material, but it is preferably a size through which the aggregate used for the mortar to be used can pass, specifically, the density is about 100 to 200 g / m ³ , It is preferable that the opening size is about several mm in length and width, more specifically about 5 to 10 mm.

  In the present invention, examples of the finishing material include natural stones and tiles constructed using an adhesive mortar or an adhesive. Further, a water-based paint or cement, or a water-based paint containing one or several kinds of inorganic aggregates / pigments such as crushed stone may be applied. Preferred water-based paints include acrylic resin emulsions, polyurethane emulsions, and epoxy emulsions.

  In the present invention, a mesh-like product made of the same material as the mesh-like inorganic material described above may be embedded in the surface mortar layer. Thereby, stabilization of a heat insulating material layer and generation | occurrence | production of a crack in a surface mortar layer can be suppressed. Further, the above-described mesh-like inorganic material may be extended so as to cover the entire surface side of the heat insulating material. Moreover, it is also possible to affix a separate mesh-like material to the end surface contact surface between the heat insulating material and the heat insulating material, thereby preventing the mortar layer from cracking on the contact surface.

  ADVANTAGE OF THE INVENTION According to this invention, the fire spread prevention structure in the outer heat insulation structure which can prevent reliably that a hot wind spreads by a chimney effect from a lower floor to an upper floor at the time of a fire is obtained.

Sectional drawing for demonstrating one Embodiment of the fire spread prevention structure in the outer heat insulation structure by this invention. The perspective view for demonstrating the form of the heavy end surface vicinity of the heat insulating material located in the low rank in the fire spread prevention structure in the outer heat insulation structure shown in FIG. Sectional drawing for demonstrating other embodiment of the fire spread prevention structure in the outer heat insulation structure by this invention. Sectional drawing for demonstrating other embodiment of the fire spread prevention structure in the outer heat insulation structure by this invention.

Hereinafter, embodiments of a fire spread prevention structure in an outer heat insulating structure according to the present invention will be described with reference to the drawings.
The outer heat insulating structure A1 shown in FIG. 1 includes, for example, a concrete wall 1 which is a building frame, and a heat insulating material layer 2 formed on the outer surface thereof. The heat insulating material layer 2 is configured by arranging a plurality of heat insulating materials 3 made of synthetic resin foam in multiple stages. A back surface mortar layer 4 is applied to the outer surface of the concrete wall 1, and the heat insulating material layer 2 is formed so as to face the back surface mortar layer 4. Some of the heat insulating materials 3 constituting the heat insulating material layer 2 are fixed to the concrete wall 1 by screws 5. A surface mortar layer 6 is also formed on the surface side of the heat insulating material layer 2, and an appropriate finishing material 7 is attached using the surface mortar layer 6.

  In the outer heat insulating structure A1, as shown in FIG. 2, in the heat insulating material 3 arranged in multiple stages in the vertical direction, the heat insulating material 3a positioned at the lower level in each step or any one of the steps has an upper end surface 31 and The mesh-like inorganic material 8 is attached so as to cover both side surfaces 32, 32 near the upper end surface 31. And the nonflammable refractory material 9 is arrange | positioned so that it may get on the mesh-shaped inorganic material 8 which covers there on the upper end surface 31 of the heat insulating material 3a. In this example, the mesh-like inorganic material 8 uses a woven fabric of glass fiber, and the incombustible refractory material 9 uses a sheet-like refractory foam material.

  Then, as shown in FIG. 1, an upper heat insulating material 3b is disposed on the lower heat insulating material 3a so as to sandwich the incombustible refractory material 9 therebetween.

  In construction, the back surface mortar is applied to the back surface of the heat insulating material 3, and the mortar surface of the heat insulating material 3 is attached to the outer surface of the concrete wall 1 while the mortar is uncured. Or a back surface mortar is apply | coated to the outer surface of the concrete wall 1, and the heat insulating material 3 is attached to a mortar surface, while the mortar is uncured. When the heat insulating material 3 is the above-mentioned heat insulating material 3a, the back surface of the heat insulating material 3a and the outer surface of the concrete wall 1 are press-contacted via the mortar surface, so that the mesh shape is located on one side surface 32 of the heat insulating material 3a. The inorganic material 8 is embedded in the mortar and is integrated with the back surface mortar layer 4 by curing the mortar.

  After affixing the heat insulating material 3, the surface mortar layer 6 is formed. At that time, the applied mortar enters the mesh-like inorganic material 8 located on the other side surface 32 of the heat insulating material 3a. And the mesh-shaped inorganic material 8 located in the other side surface 32 of the heat insulating material 3a is integrated with the surface mortar layer 6 by hardening of mortar.

  In addition, the heat insulating material 3a provided with the above-mentioned mesh-like inorganic material 8 can also be employ | adopted in each step | level of the heat insulating material 3 arrange | positioned in multiple stages in the up-down direction as mentioned above. Moreover, you may make it employ | adopt the heat insulating material 3a provided with the mesh-shaped inorganic material 8 only in the low-order heat insulating material 3 in the step part located in the boundary of the 1st floor and the 2nd floor.

  Moreover, you may make it use the heat insulating material 3a provided with the mesh-form inorganic material 8 manufactured beforehand in the factory etc. in construction, and according to the condition of a construction site, it is mesh-like on the upper end surface of the heat insulating material 3 at a construction site. The inorganic material 8 may be pasted.

  In the outer heat insulating structure having the above configuration, even when the heat insulating material in the lower heat insulating material 3a is reduced or disappeared due to high heat such as a fire, the mesh-like inorganic material 8 attached thereto has both sides thereof. Since the back surface mortar layer 4 and the front surface mortar layer 6 are integrated with each other, the original position can be maintained without falling downward. On the other hand, the incombustible refractory material 9 which is a sheet-like refractory foam material disposed on the mesh-like inorganic material 8 is expanded by expansion by heat, and a heat insulating material layer is formed in a gap between the upper heat insulating material 3b. Form. Thereby, the heat from below is prevented from being transmitted to the upper heat insulating material 3b, and the upper heat insulating material 3b can be prevented from being reduced in volume or lost. That is, in the fire spread prevention structure in the outer heat insulating structure, it is possible to avoid the occurrence of the chimney effect due to the volume reduction or disappearance of the heat insulating material made of synthetic resin foam. For example, hot air is generated by the chimney effect from the lower floor to the upper floor. It can be surely prevented from spreading.

  In the outer heat insulating structure A2 of the embodiment shown in FIG. 3, the mesh-like material 10 made of the same material as the mesh-like inorganic material 8 is arranged on the entire surface on the surface side of the heat insulating material layer 2, and this is a surface mortar. It is different from the outer heat insulating structure A1 shown in FIGS. 1 and 2 in that it is embedded in the layer 6. Other configurations are the same, and are denoted by the same reference numerals. In this aspect, stabilization of the heat insulating material layer 2 and generation of cracks in the surface mortar layer 6 can be effectively suppressed. Although not shown, in the outer heat insulating structure A1 shown in FIGS. 1 and 2, the mesh-like inorganic material 8 disposed on the upper end surface of the heat insulating material 3a is extended so as to cover the entire surface side of the heat insulating material 3a. It may be. Further, a mesh-like object may be separately attached to the end surface contact surface between each heat insulating material 3 and the heat insulating material 3 to prevent the surface mortar layer 6 from cracking on the contact surface.

  Although not shown, a mesh-like inorganic material similar to the mesh-like inorganic material 8 arranged on the upper end surface of the lower heat insulating material 3a may be attached to the lower end surface of the upper heat insulating material 3b and the vicinity thereof. Thereby, even when volume reduction occurs in the upper heat insulating material 3b, it is possible to prevent the non-combustible refractory material 9 from moving.

  FIG. 4 shows still another embodiment of the fire spread prevention structure in the outer heat insulating structure according to the present invention. This outer heat insulating structure A3 is an example in the case where it is required to provide a wide joint portion 20 in a part of the outer heat insulating structure for the purpose of improving earthquake resistance. Here, as the incombustible refractory material, a non-combustible refractory material 21 having a large volume such as rock wool is used. In order to stabilize the position of the incombustible refractory material 21, an end face mortar layer 22a is provided between the lower heat insulating material 3a and the incombustible refractory material 21, and the incombustible refractory material 21 and the upper insulating material 2b. The end face mortar layer 22b is also formed between them. Further, a sealing material 23 is embedded in the joint portion 20.

  In this outer heat insulating structure A3, although the nonflammable refractory material 21 having a large volume such as rock wool is arranged on the wide joint portion 20, the nonflammable refractory material 21 is formed by the end face mortar layers 22a and 22b from above and below. By being clamped, the movement of the non-combustible refractory material 21 can be reliably prevented when the volume of the heat insulating material is reduced.

  In addition, in the fire spread prevention structure in the outer heat insulation structure according to the present invention, the fire spread prevention structure may be formed only by the outer heat insulation structure A1 or A2, and the fire spread prevention structure may be formed by only the outer heat insulation structure A3. Moreover, it is good also as a fire spread prevention structure by combining outer heat insulation structure A1 or A2 and outer heat insulation structure A3. Which one is adopted is appropriately determined depending on the circumstances of the construction site.

A1, A2, A3 ... outer heat insulation structure (fire spread prevention structure),
1 ... Concrete wall that is the building body
2 ... heat insulation layer,
3… Insulation material,
31 ... upper end surface of the heat insulating material,
32 ... the side of the insulation,
3a: Lower insulation material,
3b ... upper thermal insulation,
4 ... Back side mortar layer,
6 ... surface mortar layer,
7 ... Finishing material,
8 ... Mesh-like inorganic material,
9 ... Incombustible refractory material,
10 ... mesh,
20 ... Wide joints,
21 ... Incombustible fireproof material,
22a, 22b ... end face mortar layers,
23 ... Sealing material.

Claims (2)

A fire spread prevention structure in an outer heat insulating structure comprising at least a configuration in which a back surface mortar layer, a heat insulating material layer, a surface mortar layer, and a finishing material are laminated in this order on the outer surface of the building frame,
The foamed resin heat insulating material layer is composed of a heat insulating material made of a synthetic resin foam arranged in a plurality of stages in the vertical direction, and at least the upper end surface and the upper surface of the heat insulating material located in the lower part of each stage or any one of the stages. both sides of the end face neighborhood is covered with mesh-like inorganic material, and at least have a configuration that incombustible refractory material is disposed between the heat insulating material located in the lower position and the heat insulating material located in the upper, A part of the structure includes an end face mortar layer provided between the lower heat insulating material and the incombustible refractory material and between the incombustible refractory material and the upper heat insulating material. Fire spread prevention structure in the outer heat insulation structure.   2. The fire spread prevention structure in an outer heat insulating structure according to claim 1, wherein the incombustible refractory material is a refractory foam material.

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