JP7236614B2 - Fireproof structure - Google Patents

Description

The present invention relates to fire resistant structures.

Patent Literature 1 listed below discloses a soundproof and heat insulating floor material in which substrates are arranged on both sides of a core material and a lightweight fireproof and heat insulating material is arranged between the core materials.

JP-A-2004-92318

In the soundproof and heat-insulating floor of Patent Document 1, for example, when the floor is fanned by flames from below in the event of a fire, if the substrate burns down, there is a risk that the lightweight fireproof heat insulating material will come off.

SUMMARY OF THE INVENTION In view of the above facts, an object of the present invention is to provide a fire-resistant structure capable of maintaining fire-resistant performance even if the surface material burns down.

A fire-resistant structure according to claim 1 comprises a wooden structure, a plurality of joints fixed to the surface of the wooden structure at intervals, a fire-resistant material arranged between the joints, and the fire-resistant material. a retaining material that can be held between the connecting materials; and a surface material fixed to the surfaces of the connecting materials , wherein the retaining material is a mesh fixed to the wooden structure or the connecting material, and The refractory material is a wet refractory material that is hardened while enclosing the mesh .

In the fire-resistant structure of claim 1, the tethers are fixed to the surface of the wooden structure, and the refractory material is held between the tethers. Therefore, fireproof performance of the wooden structure can be ensured by the fireproof material, and structural strength can be ensured by the joint material. Furthermore, since the refractory material is held between the tethers by the holding material, even if the surface material burns down, it remains between the tethers and can maintain its fire resistance.

In one aspect of the refractory structure , the retaining material is a mesh fixed to the wooden structure or the rib material, and the refractory material is a wet refractory material hardened while enclosing the mesh.

In one aspect of the refractory structure, the refractory material is a wet refractory material, which is hardened while enclosing the mesh fixed to the wooden structure or the tether. The adhesion effect between the wet refractory material and the mesh secures the wet refractory material and the wooden structure or tether. For this reason, the wet refractory material is less likely to come off compared to the case where it is fixed using an adhesive, for example, and it is easy to maintain the fire resistance performance.

The fire-resistant structure of claim 2 is the fire-resistant structure of claim 1 , wherein the fire-resistant material is formed of a precast material.

In the fire-resistant structure of claim 2 , since the fire-resistant material is a precast material, dry construction can be performed on site. For this reason, the construction period can be shortened compared to the case where the refractory material is cast on site (wet construction).

According to the fire-resistant structure according to the present invention, fire-resistant performance can be maintained even if the surface material burns down.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the outline of the fireproof structure which concerns on embodiment of this invention. (A) is a detailed cross-sectional view showing a fireproof structure according to an embodiment of the present invention, and (B) is a view taken along line BB in (A). 1 is a cross-sectional view showing a construction procedure of a fire-resistant structure according to an embodiment of the present invention, where (A) shows a state in which a joint material is fixed to a wooden structure, and (B) shows a state in which a surface material is attached to the joint material; (C) shows the state in which the end member is temporarily fixed to the wooden structure, and (D) shows the state in which the end member is temporarily fixed to the wooden structure. FIG. 2A is a cross-sectional view showing a construction procedure of a fire-resistant structure according to an embodiment of the present invention, FIG. (B) shows a state in which the end member is removed, and (C) shows a state in which the irregularities formed at the end of the wooden structure are covered with a refractory material. (A) shows a state in which the uneven portion formed at the end of the wooden structure is covered with the surface material in the fireproof structure according to the embodiment of the present invention, and (B) shows the state between the uneven portion and the surface material. (C) shows a state in which the refractory material is placed, and (C) is a state in which the joint material is arranged between the refractory material that covers the uneven part without covering the uneven part with the surface material and the refractory material that covers the other part. is shown. (A) is a cross-sectional view showing a modification in which a screw is used as a retaining material in the fireproof structure according to the embodiment of the present invention, and (B) is a retaining material sandwiched and retained between the wooden structure and the connecting material. FIG. 10 is a cross-sectional view showing a modification, in which (C) is a cross-sectional view showing a modification in which the refractory material is formed of a precast wet gypsum material, and (D) is a cross-sectional view showing a modification in which the refractory material is formed of a precast wet gypsum material and the holding material is a screw. It is a cross-sectional view showing a modified example. (A) is a cross-sectional view showing a modification in which a fire-resistant layer and a surface layer are formed on both sides of a wooden structure in the fire-resistant structure according to the embodiment of the present invention, and (B) is a cross-sectional view to which the fire-resistant structure shown in FIG. 1 is applied. FIG. 4C is a sectional view showing a modification in which wooden structures are arranged back to back and the thickness of the wooden structures is changed, and (C) is a cross section showing a modification in which an air layer is formed between the wooden structures arranged back to back. It is a diagram.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the fireproof structure which concerns on this invention is described, referring drawings. Components shown using the same reference numerals in each drawing mean the same components. In addition, description may be abbreviate|omitted about the structure and code|symbol which overlap in each drawing. Moreover, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the purpose of the present invention.

<Fire-resistant structure>
The fire-resistant structure according to the embodiment of the present invention is a structure for fire-resistant coating of the wooden structure 10 shown in FIG. formed with.

The "burning margin layer" is a layer that is ignited by exposure to flames and carbonized after combustion. The burn margin layer suppresses heat transfer to the wooden structure 10 by being carbonized. Further, the "burn-stopping layer" is a layer that suppresses heat transfer to the wooden structure 10 by absorbing heat from the refractory material forming this layer. Thereby, the temperature rise of the wooden structure 10 is suppressed.

1 and FIGS. 7A, 7B, and 7C, which will be described later, show an outline of the configuration of the fire-resistant structure according to the embodiment of the present invention, and the detailed configuration of the members forming the fire-resistant layer 20. The illustration of the end structure of the wooden structure 10 is omitted.

(woody structure)
A wooden structure 10 (hereinafter referred to as structure 10) is a building structural material formed using CLT (Cross-Laminated-Timber), and can be used as wall materials, floor materials, columns, beams, and the like.

In the following description, unless otherwise specified, the structure 10 will be described as a plate-like wall material. (including structures other than the main structural parts such as raised floors, small beams, attached pillars, etc.). In addition to CLT, the material for forming the wooden structure may be LVL, laminated lumber, wood molded material (particle board, MDF, etc.), or the like.

As shown in FIGS. 2A and 2B, an uneven portion 12 is formed on the end face of the structure 10 . The concave-convex portion 12 is formed by alternately arranging convex portions 12A projecting outward in the in-plane direction of the structure 10 and concave portions 12B recessing inward in the in-plane direction of the structural body 10 along the end face. there is

The structures 10 adjacent to each other are connected by engaging the concave and convex portions 12 of each. That is, by engaging the convex portion 12A of one structural body 10 with the concave portion 12B of the other structural body 10, stress (shear stress and compressive stress) can be transmitted between the structural bodies 10. FIG. The uneven portions 12 may or may not be joined to each other using an adhesive, screws, or the like.

(Fire resistant layer)
The refractory layer 20 includes a tether 22 , refractory materials 24 and 26 and a retaining material 28 .

The connecting members 22 are long wooden members fixed to the surface of the structure 10 at predetermined intervals. The connecting material 22 is fixed to the structure 10 using screws or the like, for example.

The refractory materials 24 and 26 are refractory materials that are filled between the joints 22 and cover the structure 10 . As a material for forming the fireproof materials 24 and 26, it is preferable to select a material having a heat capacity greater than at least wood.

As an example, the refractory material 24 is formed using a gypsum board, and the refractory material 26 is formed using a wet gypsum material having a higher moisture content than the gypsum board. The wet gypsum material is made into an unhardened fresh mortar by kneading powder whose main raw material is gypsum with water, and hardens over time. As the wet gypsum material, for example, a self-leveling material that adjusts the unevenness of the floor can be used.

A plurality of refractory materials 24 are laminated over the uneven portion 12 of the structure 10 and cover both ends of the structures 10 adjacent to each other. The refractory material 24 is disposed between the outermost refractory materials 26 fixed to the structures 10 adjacent to each other and formed substantially flush with the surface of the surface material 30 . Also, the refractory material 24 is arranged in contact with the refractory material 26 .

The refractory material 26 is a refractory material that covers portions of the structure 10 other than the ends. The refractory material 26 is arranged between the tethers 22 fixed to the same structure 10 and formed substantially flush with the surface of the tethers 22 . The fireproof material 26 is also arranged outside the joint material 22 . That is, the refractory material 26 is also arranged outside the connecting material 22 fixed to the endmost side of the structure 10 , and the refractory material 26 is arranged in contact with the refractory material 24 .

Retainer 28 is a steel mesh secured to both adjacent tethers 22 . Moreover, the holding material 28 is enclosed in the fireproof material 26 and holds the fireproof material 26 between the joint materials 22 . In other words, the refractory material 26 is held between the tethers 22 by adhering to the holding material 28 fixed to the tethers 22 .

(Surface layer)
The surface material 30 is made of a wooden material and covers the surface of the fireproof layer 20 . More specifically, the surfaces of the connecting material 22 and the fireproof material 26 in the fireproof layer 20 are covered. As described above, the surface material 30 is positioned adjacent to the refractory material 24 and the surface of the surface material 30 is substantially flush with the surface of the refractory material 24 .

<Construction method>
A fire-resistant structure according to an embodiment of the present invention is constructed by the following procedure.

First, as shown in FIG. 3A, the connecting material 22 is fixed to the structure 10 using screws or the like. At this time, the holding material 28 is bridged over each of the adjacent connecting materials 22, and the ends of the holding material 28 are fixed to the connecting material 22 using a tucker or the like. The holding material 28 is preferably fixed so as to be spaced apart from the back surface of the connecting material 22 (the surface on the structure 10 side). Thereby, when the connecting material 22 is fixed to the structure 10 , a gap is formed between the holding material 28 and the structure 10 .

Note that the holding material 28 may be fixed to the connecting material 22 after the connecting material 22 is fixed to the structure 10 . By doing so, the workability of the connecting material 22 is improved. Further, in this specification, when a fixing method is described as "a screw or the like", it includes a fixing method using a nail or an adhesive.

Next, as shown in FIG. 3(B), the surface material 30 is fixed to the connecting material 22 using screws or the like, and as shown in FIG. 3(C), the end member 22A is temporarily fixed to the structure 10. . 22 A of end members are temporarily fixed to the structure 10 in the state which pinched|interposed the holding material 28. As shown in FIG. Furthermore, as shown in FIG. 3(D), the end of the holding member 28 is folded back and temporarily fixed to the end member 22A. The surface material 30 may be applied after the end member 22A.

Next, as shown in FIG. 4(A), the respective uneven portions 12 of the two structures 10 are engaged to connect the structures 10 together, and the space between the surface material 30 and the structure 10 is not covered with the surface material 30 . Hardened refractory material 26 is placed. When placing the uncured refractory material 26, the refractory material 26 is placed between the holding material 28 and the surface material 30 and between the holding material 28 and the structure 10 so that the refractory material 26 and the holding material 28 are easily entwined. It is preferable to place them approximately evenly between them.

Since the holding material 28 is made of steel mesh, the refractory material 26 is cast into either one of the spaces (between the holding material 28 and the surface material 30 or between the holding material 28 and the structure 10). can flow to the other. However, depending on the wire diameter and strength of the steel mesh, there is a possibility that the holding member 28 will be unevenly arranged due to the flow pressure. For this reason, it is preferable to cast in both spaces.

After hardening the refractory material 26, the end member 22A is removed as shown in FIG. 4(B). After that, as shown in FIG. 4(C), the refractory material 24 is fixed to the structure 10 . The refractory material 24 is fixed to the structure 10 with the holding material 28 sandwiched therebetween. Also, the refractory material 24 is arranged in contact with the refractory material 26 . Through the above steps, the fireproof structure according to the embodiment of the present invention is constructed.

<Action/effect>
In the fireproof structure according to the embodiment of the present invention, as shown in FIG. 2(A), long joint members 22 are fixed to the surface of the structure 10, and fireproof members 24 and 26 are arranged between the joint members 22. held. Therefore, the fireproof performance of the structure 10 can be ensured by the fireproof materials 24 and 26, and the structural strength can be ensured by the joint material 22. As shown in FIG.

Also, the structure 10 is covered with a refractory material 24 and a refractory material 26 . For this reason, fire resistance performance can be ensured for the wooden structure 10 .

Furthermore, the refractory material 24 is arranged across the surface of the uneven portion 12 to cover the end portion of the wooden structure 10 . As a result, the fire resistance of the joints of the structure 10 is less likely to deteriorate.

In this embodiment, the connecting material 22 is a wooden member, but from the viewpoint of ensuring strength, it may be formed of a steel material such as a C-shaped channel. Alternatively, it may be formed of a stud material formed of light iron.

Also, the refractory material 26 is held between the connecting materials 22 by the holding material 28 . Therefore, even if the surface material 30 burns down, it stays between the joint materials 22 and can maintain fire resistance.

Further, the refractory material 26 is a wet gypsum material, which is hardened while enclosing a retaining material 28 formed of steel mesh. This holding material 28 is fixed to the connecting material 22 . Therefore, the refractory material 26 and the binding material 22 are fixed by the adhesion effect of the wet gypsum material and the steel mesh.

As a result, compared with the case where the fireproof material 26 is fixed to the structure 10 using an adhesive or the like, the fireproof material 26 is less likely to come off, and the fireproof performance can be easily maintained.

Moreover, in the fireproof structure according to the embodiment of the present invention, as shown in FIGS. ing. Thereby, stress can be transmitted between the structures 10 .

In addition, in the fireproof structure according to the present embodiment, the fireproof material 24 and the fireproof material 26 arranged outside the connecting material 22 are in contact with each other. Therefore, compared to the configuration in which the connecting material 22 is arranged between the refractory material 24 and the refractory material 26, the installation width of the refractory material is increased. Furthermore, when the refractory material 24 is exposed to flames, the refractory material 26, which has a higher moisture content than the refractory material 24, absorbs heat, thereby suppressing the temperature rise at the joint. Thereby, the fire resistance performance in the joint of the structure 10 can be improved.

In the above embodiment, the surface material 30 and the fireproof material 24 are arranged adjacent to each other, and the surface material 30 is not arranged in front of the uneven portion 12, but the embodiment of the present invention is not limited to this. For example, as shown in FIG. 5A, the surface material 30 may be arranged in front of the uneven portion 12 . At this time, it is preferable to form uneven portions 32 at the ends of the surface materials 30 to connect the surface materials 30 to each other.

By forming the surface material 30 in this manner, a closed space can be formed between the uneven portion 12 and the surface material 30 . As a result, as shown in FIG. 5B, the refractory material 26 of the wet material having a higher water content than the dry material can be applied to the end of the structure 10 .

If the refractory material covering the ends of the structure 10 is a wet refractory material 26, the refractory material 26 and the adjacent refractory material 24 are arranged in contact with each other, as shown in FIG. 5(C). It doesn't have to be. That is, the connecting material 22 may be arranged between the refractory material 26 and the refractory material 24 . At this time, when the refractory material 26 covering the end portion of the structure 10 is formed, a formwork 26S or the like may be arranged as appropriate.

Further, in the present embodiment, as shown in FIG. 2A, the holding material 28 is made of steel mesh and fixed to the connecting material 22, but the embodiment of the present invention is not limited to this. For example, like a holding member 40 shown in FIG. 6A, the holding member may be formed of a screw or an anchor bolt, and the screw head or bolt head may be embedded in the refractory material 26 .

Alternatively, as in a holding member 42 shown in FIG. 6B, the holding member may be sandwiched between the binding member 22 and the structure 10 instead of directly fixed to the binding member 22 .

Further, in the present embodiment, the refractory material 26 is a cast-in-place wet gypsum material, but the embodiment of the present invention is not limited to this. For example, a precast wet gypsum material may be used, such as the refractory material 50 shown in FIG. 6(C).

When molding the precast wet gypsum material, a steel mesh retainer 28 is placed in the mold. Moreover, the holding material 28 is arranged so that both ends protrude from the wet gypsum material. The refractory material 50 is removed from the mold after hardening and carried to the site. Then, the joint material 22 is fixed to the structure 10 by sandwiching both ends of the holding material 28 between the joint material 22 and the structure 10 at the site.

In addition, the precast wet gypsum material does not have to be pre-arranged with a retaining material. For example, like the refractory material 52 shown in FIG. 6(D), the refractory material can be arranged and held between the connecting materials 22 even if screws 46 as the holding material are driven from the surface and fixed to the structure 10 . can be done.

Thus, if the refractory material is a precast material, dry construction can be performed on site. For this reason, the construction period can be shortened compared to the wet construction of the refractory material on site.

In addition, it is not always necessary to use a wet gypsum material as the wet refractory material. For example, a lime-based material, cement, mortar, or the like may be used instead of the gypsum material.

Moreover, in this embodiment, as shown in FIG. 1, the fire-resistant layer 20 and the surface material 30 are arranged on one side of the structure 10, but the embodiment of the present invention is not limited to this. For example, the fire-resistant layer 20 and the surface material 30 may be arranged on both sides of the structure 10 as shown in FIG. 7(A).

Note that the thickness of the structure 10 can be appropriately changed as shown in FIGS. 7(A) and 7(B). In other words, the required thickness should be secured according to the intended use (walls, floors, beams, columns) and the required structural strength.

Furthermore, as shown in FIG. 7C, the structures 10 having the fireproof layer 20 and the surface material 30 arranged on one side thereof may be arranged facing each other and spaced apart to secure a space between the structures 10. . This space can be used as a sound insulation layer, a heat insulation layer, a facility piping space, and the like. When used as a sound insulation layer or heat insulation layer, materials such as rock wool, glass wool, and urethane foam may be filled.

Moreover, although the uneven portion 12 is formed on the end surface of the structure 10 in the present embodiment, the embodiment of the present invention is not limited to this. For example, the end faces of the structures 10 may be formed flat without forming such uneven portions 12, and the structures 10 may be fixed together using spline plates, screws, or the like. Alternatively, they may simply be mated and not fixed to each other. The refractory material can be held on the surface of the structure 10 by using the holding material 28 or the like regardless of the configuration of the ends of the structure 10 . Thus, the present invention can be implemented in various modes.

10 Wooden structure 22 Tie material 26 Refractory material (wet refractory material)
28 holding material (mesh)
30 surface material

Claims (2)

a wooden structure;
a plurality of joints fixed to the surface of the wooden structure at intervals;
a refractory material disposed between the tethers;
a holding material capable of holding the refractory material between the connecting materials;
a surface material fixed to the surface of the connecting material;
with
The retaining material is a mesh fixed to the wooden structure or the connecting material,
The refractory material is a wet refractory material cured with the mesh enclosed,
Fire resistant construction. 2. The refractory structure of claim 1 , wherein said refractory material is formed of precast material.

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