JP6719188B2 - Structural member - Google Patents

Description

The present invention relates to a fireproof wood structural member.

In recent years, wood-based structural members having fire resistance have been used as members such as columns and beams constituting a building. For example, Patent Document 1 has a surface layer made of wood, a flame-retardant drug injection layer provided inside the surface layer, and an untreated layer provided inside the flame-retardant drug injection layer. Disclosed is a fire-resistant laminated material.

When such a fire-resistant wooden structural member is provided with a through hole for passing equipment pipes and ducts, etc., untreated as a load supporting part due to the flame and heat entering from this through hole during a fire. There is concern that the temperature of the layer reaches the combustion temperature, the untreated layer burns, and the fire resistance of the structural member decreases.

JP, 2008-31743, A

In consideration of such a fact, an object of the present invention is to reduce deterioration of fire resistance of a wooden structural member due to the provision of through holes.

A first aspect of the invention is a wood member having a load support portion and a fireproof coating portion provided around the load support portion, a through hole penetrating the load support portion, and an inner peripheral surface of the through hole. A refractory layer covering the shape-retaining member formed along the inner peripheral surface of the refractory layer, and arranged along the inner peripheral surface or the outer peripheral surface of the shape-retaining member to improve the fire resistance of the refractory layer. And a fireproof reinforcing layer.

In the invention of the first aspect, in the event of a fire, the entry of flames and heat that have entered the through holes into the load support portion is suppressed by the fire resistant layer whose fire resistance is improved by the fire resistant reinforcing layer, and the temperature rise of the load support portion. Can be reduced and the load supporting portion can be stopped without burning. That is, it is possible to reduce deterioration of fire resistance of the wooden structural member due to the provision of the through hole.

According to a second aspect of the invention, in the structural member according to the first aspect, the fire resistant reinforcing layer is formed of a heat-foamable fire resistant sheet provided inside the fire resistant layer.

According to the second aspect of the invention, at the time of fire, the fire-resistant reinforcing layer formed of the heat-foamable fire-resistant sheet is heated and foams, and the volume of the fire-resistant reinforcing layer increases. Thereby, the fire resistance of the fireproof layer can be improved by the fireproof reinforcing layer having a high heat insulating property. Further, at the time of fire, the fireproof reinforcing layer formed by the heat-foamable fireproof sheet is heated and foams, and spreads in the through hole. This suppresses the entry of flames and heat into the through holes.

The invention of a third aspect is the structural member according to the first or second aspect, wherein the refractory layer is formed of a gypsum board arranged so as to cover the inner peripheral surface of the through hole.
A fourth aspect of the invention is the structural member according to any one of the first to third aspects, wherein the both end portions in the axial direction of the through hole are arranged so as to cover the end faces of the fire resistant layer and the shape retaining member. In addition, plate members each having a hole portion communicating with the through hole are provided, and the fire resistant reinforcing layer is arranged in the hole portion of the plate member along the inner peripheral surface.

In the invention of the third aspect, the fire resistant layer can be formed by the gypsum board having excellent fire resistance.

Since the present invention has the above-described configuration, it is possible to reduce deterioration of fire resistance of the wooden structural member due to the provision of the through hole.

It is a front sectional view showing a beam concerning an embodiment of the present invention. It is a front sectional view showing a beam concerning an embodiment of the present invention. FIG. 3 is a sectional view taken along line AA of FIG. 2. It is a perspective view showing a fireproof member concerning an embodiment of the present invention. It is a perspective view which shows the construction method of the beam which concerns on embodiment of this invention. It is a perspective view which shows the construction method of the beam which concerns on embodiment of this invention. It is a perspective view which shows the construction method of the beam which concerns on embodiment of this invention. It is a perspective view which shows the construction method of the beam which concerns on embodiment of this invention. It is a side view showing the situation where the fire-resistant reinforcement layer concerning the embodiment of the present invention foamed. It is a front sectional view showing a beam concerning a reference example . FIG. 11 is a sectional view taken along line BB of FIG. 10. It is a front sectional view showing a variation of a beam concerning an embodiment of the present invention. It is a side view showing the situation where the fire-resistant reinforcement layer concerning the embodiment of the present invention foamed.

An embodiment of the present invention will be described with reference to the drawings. First, the structural member of the embodiment of the present invention will be described.

As shown in FIG. 3, which is a front sectional view of FIG. 1, a front sectional view of FIG. 2, and an AA sectional view of FIG. 2, a beam 10 as a structural member includes a beam main body 12 as a wooden member and a load. A through hole 16 formed of a circular hole that penetrates the wooden beam core material 14 as a load supporting portion that supports the, a fire resistant layer 20 provided so as to cover an inner peripheral surface 18 of the through hole 16, and an inside of the fire resistant layer 20. And a fireproof reinforcement layer 22 which is provided on the fireproof layer 20 to improve the fireproofness of the fireproof layer 20. FIG. 1 shows a cross section of the beam 10 in a portion where the through hole 16 is not formed, and FIG. 2 shows a cross section of the beam 10 in a portion where the through hole 16 is formed.

The beam main body 12 includes a beam core material 14, and a fireproof coating portion 24 provided around the beam core material 14 by surrounding the side surface and the lower surface of the beam core material 14. The fireproof coating portion 24 surrounds the side surface and the lower surface of the beam core material 14 and is provided around the beam core material 14, and the flameproof coating layer 24 surrounds the side surface and the lower surface of the flameproof layer 26. And a wood burn-up layer 28 provided around the. The flame-retardant layer 26 is a layer having a heat absorption property.

The beam core material 14 supports a floor slab 30 made of reinforced concrete, and the floor slab 30 covers the burn margin layer 28, the unburnt layer 26, and the upper surface of the beam core material 14.

The flame-retardant layer 26 is a plate member 32 formed of wood (hereinafter referred to as "general wood") used for general wooden construction such as Yonematsu, Karamatsu, Japanese cypress, cedar, and Asunaro, and a plate formed of mortar. It is formed by alternately arranging the mortar bars 34 in the shape of a circle.

As shown in FIG. 2, the fireproof reinforcing layer 22 is formed into a cylindrical shape by holding the heat-foamable fireproof sheet on the inner peripheral surface of the shape-retaining member 36 made of a hard vinyl chloride pipe provided inside the through hole 16. Has been formed. The heat-foamable refractory sheet may be wound around the inner peripheral surface of the shape-retaining member 36 once, or may be wound a plurality of times and overlapped. The heat-foamable refractory sheet is a sheet material which has a large volume when heat is applied and a high heat insulating property is obtained, whereby the fireproof effect is exhibited. The inner peripheral surface of the shape-retaining member 36, the heat-foamable fireproof sheet, and the heat-foamable fireproof sheets are attached to each other with an adhesive or an adhesive. That is, the fireproof reinforcement layer 22 is formed by the heat-foamable fireproof sheet provided inside the fireproof layer 20.

The refractory layer 20 is formed of hardened mortar into a cylindrical shape, is disposed between the inner peripheral surface 18 of the through hole 16 and the outer peripheral surface of the shape retaining member 36, and is provided on the beam core material 14. There is. The refractory layer 20 and the shape retaining member 36 are arranged inside the flame-retardant layer 26.

The beam main body 12 has a through hole 38 formed of a circular hole penetrating the burn-in margin layer 28, the burn-stop layer 26, and the beam core material 14, and the inner peripheral surface of the fireproof reinforcing layer 22 is the inner peripheral surface of the through hole 38. Has become part of the plane. Further, the fireproof layer 20, the shape retaining member 36, and the fireproof reinforcing layer 22 are provided around the through hole 38. The through holes 38 are provided for arrangement through equipment pipes such as sprinkler pipes and ducts.

As shown in FIGS. 2 and 3, a plate-like member 40 made of mortar and thinner than the mortar bar 34 is provided in the small hole of the through hole 16 so as to cover the end faces of the fire-resistant layer 20 and the shape-retaining member 36. ing. The plate member 40 constitutes a part of the flame-retardant layer 26. Further, a through hole 42 as a hole is formed in the plate member 40, and a fire resistant reinforcing layer 44 having the same configuration as the fire resistant reinforcing layer 22 is provided on the inner peripheral surface of the through hole 42. It is provided so as to cover the end face of 22.

Next, an example of a procedure for constructing the beam 10 will be described. First, as shown in the perspective view of FIG. 4, the refractory member 50 is manufactured. The fire-resistant member 50 includes the fire-resistant layer 20, a shape-retaining member 36 provided on the inner peripheral surface of the fire-resistant layer 20, and a fire-resistant reinforcing layer 22 provided on the inner peripheral surface of the shape-retaining member 36. ing. The fire-resistant member 50 can be manufactured, for example, by attaching the fire-resistant reinforcing layer 22 to the inner peripheral surface of the shape-retaining member 36 and driving mortar on the outer periphery of the shape-retaining member 36 to form the fire-resistant layer 20.

Next, as shown in the perspective view of FIG. 5, the refractory member 50 is inserted into the through hole 16 formed in the beam core material 14 and attached in the through hole 16.

Next, as shown in the perspective view of FIG. 6, the mortar bar 34 is attached to the outer peripheral surface (side surface and lower surface) of the beam core member 14 by a fixing member such as a wood screw (not shown).

Next, as shown in the perspective view of FIG. 7, a flame-retardant fireproof sealant (not shown) is provided on the end face of the fireproof member 50, and the hollow portion of the shape retaining member 36 and the plate member 40 are formed. The plate member 40 is arranged on the outer peripheral surface (side surface) of the beam core material 14 so as to communicate with the through hole 42.

Next, as shown in the perspective view of FIG. 8, the outer peripheral portion of the plate member 40 is fixed to the beam core member 14 by a fixing member 56 such as a wood screw. In this state, the gap between the end surface of the fireproof member 50 and the inner surface 54 of the plate member 40 is completely closed by the fireproof sealing material.

In this way, the plate member 40 is made thinner than the mortar bar 34, and the space between the end surface of the fire resistant member 50 and the inner surface 54 of the plate member 40 is covered with the fire resistant sealing material, so that the flame that has entered the through hole 38. Heat and heat are prevented from entering the beam core material 14 through the gap between the end surface of the refractory member 50 and the inner surface 54 of the plate member 40, and the outer surface of the mortar bar 34 and the outer surface of the plate member 40 are flush with each other. Can be

Next, the plate member 32 and the burn margin layer 28 are attached to the wall surface 58 where the mortar bar 34 and the plate member 40 are provided on the side surface of the beam core material 14 shown in FIG. As a result, the plate members 32 and the mortar bars 34 are alternately arranged to form the burn-stop layer 26, and the burn-up layer 28 is arranged outside the burn-stop layer 26 to configure the beam 10.

Next, the operation and effect of the structural member of the embodiment of the present invention will be described.

In the beam 10 of the present embodiment, as shown in FIGS. 1 and 2, when a fire occurs, the flame ignites the burn-in layer 28, and the burn-in layer 28 burns. Then, the burned stock layer 28 is carbonized. Therefore, heat transfer from the outside of the burn-in margin layer 28 to the beam core material 14 is suppressed by the carbonized burn-in margin layer 28. Further, the flame-stop layer 26 suppresses the entry of flames and heat from the outside of the burn-up layer 28 into the beam core material 14.

With these, the temperature rise of the beam core material 14 at the time of a fire and after the fire can be suppressed, and the beam core material 14 can be stopped without burning.

Further, in the beam 10 of the present embodiment, as shown in FIG. 2, in the event of a fire, the flame and heat entering the through hole 38 (through hole 16) are prevented from entering the beam core material 14 by the fire resistant reinforcement layer 22. The refractory layer 20 having improved properties suppresses the temperature rise of the beam core material 14 so that the beam core material 14 can be stopped without burning. That is, it is possible to reduce the deterioration of the fire resistance of the wooden beam 10 due to the provision of the through holes 38 (through holes 16).

Further, in the beam 10 of the present embodiment, as shown in FIG. 2, the fire-resistant reinforcing layer 22 formed of the heat-foamable fire-resistant sheet is heated and foams during a fire, and the volume of the fire-resistant reinforcing layer 22 increases. Thereby, the fire resistance of the fire resistant layer 20 can be improved by the fire resistant reinforcing layer 22 having high heat insulation.

Further, at the time of fire, the fireproof reinforcing layer 22 formed of the heat-foamable fireproof sheet is heated and foams, and spreads in the through hole 38 (through hole 16). This suppresses the entry of flames and heat into the through holes 38 (through holes 16). Further, when the fire does not occur, since the fireproof reinforcing layer 22 is in a thin state, it is possible to secure a large opening in the through hole 38, and at the time of fire, the fireproof reinforcing layer 22 foams and exhibits a high heat insulating property. can do.

In the beam 10, since the fireproof reinforcing layer 22 is provided inside the shape maintaining member 36, the foaming of the fireproof reinforcing layer 22 is performed without being obstructed by the shape maintaining member 36, whereby the fireproof reinforcing layer 22 is formed. It can be inflated greatly at an early timing. For example, as shown in the side view of FIG. 9, the fireproof reinforcement layer 22 can be inflated so as to close all of the through holes 38 in the event of a fire.

Further, in the beam 10 of the present embodiment, as shown in FIG. 2, by providing the heat-foamable fireproof sheet on the inner peripheral surface of the shape retaining member 36 to form the fireproof reinforcement layer 22, the through hole 38 (through hole The fireproof reinforcing layer 22 corresponding to various sizes and shapes of 16) can be formed. For example, since the fireproof reinforcement layer 22 corresponding to the through holes 38 having a diameter of about 200 mm can be formed, it is possible to arrange not only equipment pipes such as sprinkler pipes but also equipment pipes such as ducts through the through holes 38.

Further, by forming a plurality of heat-foamable fireproof sheets to form the fireproof reinforcement layer 22, it is possible to form the fireproof reinforcement layer 22 of various thicknesses, and to obtain the fireproof reinforcement layer 22 having necessary fire resistance. Can be formed.

Further, the refractory layer 20 can be formed in various sizes and shapes in accordance with the size of the through hole 38 (through hole 16) by being formed of mortar.

The embodiments of the present invention have been described above.

In the present embodiment, as shown in FIGS. 1 and 2, the burn margin layer 28 and the beam core 14 are made of wood, but the burn margin layer 28 and the beam core 14 are made of wood. Just do it. For example, the burn-up layer 28 and the beam core material 14 may be formed of general wood, or the general wood is processed into a plate-like or prismatic single material, and a plurality of the single materials are assembled and integrated. You may form by.

Further, in the present embodiment, an example in which the flame-retardant layer 26 is a layer having a heat absorbing property is shown, but the flame-retardant layer 26 may be a layer capable of suppressing the entry of flame and heat and exhibiting a flame-retardant effect. Good. For example, the flame-retardant layer 26 may be a layer having flame retardancy or a layer capable of absorbing heat.

Examples of the flame-retardant layer include a flame-retardant agent injection layer obtained by injecting a flame-retardant agent into wood to make it incombustible. The flame-retardant drug injecting layer can be made to have heat absorption. The layer capable of absorbing heat may be formed of a material having a larger heat capacity than general wood, a material having a higher heat insulation property than general wood, or a material having a higher thermal inertia than general wood. You may form in combination with general wood. In addition, a flame-retardant layer is formed by combining a layer having flame retardancy and a layer capable of absorbing heat (for example, alternately disposing layers having flame retardancy and layers capable of absorbing heat). 26 may be formed.

Examples of the material having a larger heat capacity than general wood include mortar, stone material, glass, fiber-reinforced cement, inorganic materials such as gypsum, and various metal materials. Materials having higher heat insulation than general wood include calcium silicate board, rock wool, glass wool and the like. Materials having higher thermal inertia than general wood include woods such as serra ganbatu, jara, and bongosi.

Further, in the present embodiment, as shown in FIGS. 1 and 2, the beam main body 12 as a wooden member is configured to have a beam core material 14 as a load supporting portion, an end-of-burn layer 26, and a burning margin layer 28. However, the wood member only needs to have a load supporting portion and a fireproof covering portion provided around the load supporting portion, and the wooden member may have two layers or four layers. It may be a member having a structure of more than one layer. Further, the fireproof coating portion may be one that can stop the load supporting portion without burning in the event of a fire.

For example, the wooden member may be a member having a two-layer structure including only a load supporting portion and a non-burning layer provided around the load supporting portion. Further, the wooden member may be a member having a two-layer structure configured to include only a load supporting portion and a burn-up margin layer provided around the load supporting portion. In this case, if the thickness (for example, about 40 mm) of the combustion allowance layer capable of exhibiting the combustion stop effect can be secured, the load supporting portion and the combustion allowance layer may be formed of different materials or the same material. May be. That is, the wooden member may be made of one piece of wood, and the surface layer of this wooden member may be used as the burnable layer. Further, for example, the wooden member may be a member including a load supporting portion and a gypsum board provided around the load supporting portion, or the load supporting portion and the load supporting portion. It may be a member configured by including a gypsum board provided around the gypsum board and a thermally foamable material provided around the gypsum board. The heat-foamable material is a material which has a large volume when heat is applied and a high heat insulating property is obtained, whereby a flame-stopping effect is exhibited. Further, for example, a finishing material such as a decorative plywood or a decorative board may be provided around these wooden members.

Further, in the present embodiment, as shown in FIG. 2, an example in which the refractory layer 20 is made of mortar has been shown, but the refractory layer 20 may be made of a material that will stop burning for a predetermined time. The refractory layer 20 is preferably formed of a flame-retardant material. For example, the refractory layer 20 may be formed of the above-mentioned materials that enable the formation of the flame-retardant layer 26. If the refractory layer 20 is a layer having a heat absorbing property, the heat stop effect can be improved by absorbing the heat that has entered the through holes 38 (through holes 16).

Further, for example, the fireproof layer 20 may be made of fireproof paint. That is, the refractory layer 20 may be formed by applying a refractory paint to the inner peripheral surface 18 of the through hole 16 formed in the beam core material 14. Further, the refractory layer 20 may be formed of fiber reinforced mortar (mortar reinforced by mixing synthetic resin, steel fiber, etc.).

Further, for example, the refractory layer 20 may be formed of a gypsum board, such as the beam 62 as a reference example shown in the front sectional view of FIG. 10 and the BB sectional view of FIG. In this example, the through hole 16 is a square hole having a square opening, and the fireproof layer 20 is formed by a gypsum board arranged so as to cover the inner peripheral surface of the through hole 16. A fireproof reinforcing layer 22 is provided on the inner peripheral surface of the fireproof layer 20.

In this way, if the fire resistant layer 20 is formed of a gypsum board, the fire resistant layer 20 can be formed of a gypsum board having excellent fire resistance .

Furthermore, by changing the size and shape of the gypsum board, it is possible to form a fire resistant layer corresponding to the hole size and shape of various through holes. Further, by changing the thickness of the gypsum board or arranging the gypsum boards in a stacked manner, it is possible to form fireproof layers of various thicknesses.

Further, the gypsum boards may be provided so as to overlap with each other, and the gypsum board arranged on the outer side may be the fire resistant layer and the gypsum board arranged on the inner side may be the fire resistant reinforcing layer. Furthermore, a thick gypsum board may be used, and the outer gypsum board portion may be the fire-resistant layer and the inner gypsum board portion may be the fire-resistant reinforcement layer.

Further, in the present embodiment, as shown in FIG. 2, an example in which the fire-resistant reinforcing layer 22 is formed of a heat-foamable fire-resistant sheet has been shown, but the fire-resistant reinforcing layer 22 may improve the fire resistance of the fire-resistant layer 20. Anything can be used. The fireproof reinforcement layer 22 is preferably made of a flame retardant material. For example, the fireproof reinforcement layer 22 can be formed of the above-mentioned materials that enable the formation of the flameproof layer 26. When the fireproof reinforcement layer 22 is a layer having heat absorption property, the heat resistance of the fireproof layer 20 can be improved by absorbing the heat that has entered the through holes 38 (through holes 16).

Further, for example, the fireproof reinforcing layer 22 may be a heat-foamable fireproof paint or a fireproof paint. That is, the fire-resistant reinforcing layer 22 may be formed by applying a heat-foaming fire-resistant paint or a fire-resistant paint to the inner peripheral surface of the fire-resistant layer 20. Further, the fireproof reinforcing layer 22 may be formed of fiber reinforced mortar (mortar reinforced by mixing synthetic resin or steel fiber).

Further, in the present embodiment, as shown in FIG. 2, an example in which the shape-retaining member 36 is a hard vinyl chloride pipe is shown, but the shape-retaining member 36 holds the heat-foamable fireproof sheet and holds the fireproof reinforcement layer 22. What is necessary is just to be able to form. For example, the shape retaining member 36 may be a cylindrical member formed of a paper void, a steel pipe, mortar, or gypsum. The shape retaining member 36 is preferably made of a material having both curability and flame retardancy.

Further, in the present embodiment, an example in which the shape retaining member 36 is provided on the inner peripheral surface of the fire resistant layer 20 and the fire resistant reinforcing layer 22 is provided on the inner peripheral surface of the shape retaining member 36 has been shown. The fireproof reinforcing layer 22 may be provided on the outer peripheral surface of the shape retaining member 36 like the beam 64 as the structural member shown in FIG.

In this case, the fireproof reinforcing layer 22 is formed in a cylindrical shape by holding the heat-foamable fireproof sheet on the outer peripheral surface of the shape holding member 36. The heat-foamable refractory sheet may be wound around the outer peripheral surface of the shape-retaining member 36 once, or may be wound a plurality of times and a plurality of layers may be stacked. The outer peripheral surface of the shape maintaining member 36, the heat-foamable fireproof sheet, and the heat-foamable fireproof sheets are attached to each other with an adhesive or an adhesive. The shape-retaining member 36 is made of a material that burns in the event of a fire (for example, a void material).

A waterproof aluminum foil sheet may be provided on the outer peripheral surface of the fireproof reinforcing layer 22. By doing so, when the refractory layer 20 is formed by filling the mortar between the inner peripheral surface of the through hole 16 and the outer peripheral surface of the fire resistant reinforcing layer 22, the moisture during the filling of the mortar is 22 can be prevented from penetrating into the heat-foamable refractory sheet.

In the beam 64 of FIG. 12, after the shape-retaining member 36 is burnt out in the event of a fire, the fireproof reinforcing layer 22 formed of the heat-foamable fireproof sheet is heated and foams, and the volume of the fireproof reinforcing layer 22 increases. Alternatively, when the shape-retaining member 36 is burnt out in the event of a fire, the fire-resistant reinforcing layer 22 formed by the heat-foamable fire-resistant sheet is heated and foams, pierces the shape-retaining member 36, and the volume of the fire-resistant reinforcing layer 22. Will grow. For example, as shown in the side view of FIG. 13, the fireproof reinforcement layer 22 can be inflated so as to close the through hole 38 at the time of fire. As a result, the fire resistance of the fire resistant layer 20 can be improved by the fire resistant reinforcing layer 22 having a high heat insulating property.

Furthermore, in the present embodiment, as shown in FIGS. 2 and 3, the through holes 16 and 38 are circular holes, but the present embodiment can be applied to through holes having other shapes such as square holes. Forms can be applied.

Further, in the present embodiment, as shown in FIGS. 1 and 2, the flame-retardant layer 26 is arranged so as to surround the side surface and the lower surface of the beam core material 14, and the burn-up layer 28 and the side surface of the flame-retardant layer 26. Although the example in which it is arranged so as to surround the lower surface is shown, the flame-stop layer 26 may be arranged so as to surround the entire outer periphery of the beam core material 14, and the burn-off layer 28 is defined as the outer periphery of the beam core material 14. You may arrange|position so that the perimeter of the flame-retardant layer 26 arrange|positioned so that all may be enclosed may be enclosed.

Furthermore, in the present embodiment, an example in which the structural member is the beam 10 is shown, but the structural member of the present embodiment can be applied to beams, walls, structural members other than beams and walls.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the scope of the present invention.

10, 62, 64 beams (structural members)
12 Beam body (wooden member)
14 Beam core (load support)
16 Through Hole 20 Fireproof Layer 22 Fireproof Reinforcing Layer 24 Fireproof Cover
42 Through hole (hole)

Claims (3)

A wood member having a load supporting portion and a fireproof coating portion provided around the load supporting portion,
A through hole penetrating the load supporting portion,
A refractory layer covering the inner peripheral surface of the through hole,
A shape-retaining member formed along the inner peripheral surface of the refractory layer,
Arranged along the inner peripheral surface of the shape-retaining member, a fireproof reinforcing layer for improving the fire resistance of the fireproof layer,
Have a,
Plate-like members are provided at both axial ends of the through-hole, respectively, so as to cover the end face of the refractory layer and the end face of the shape-retaining member, and in which hole portions communicating with the through-hole are formed. ,
A structural member in which the fireproof reinforcing layer is arranged along the inner peripheral surface in the hole of the plate-shaped member. The structural member according to claim 1, wherein the fireproof reinforcement layer is formed by a heat-foamable fireproof sheet provided inside the fireproof layer. The structural member according to claim 1 or 2, wherein the refractory layer is formed by a gypsum board arranged so as to cover an inner peripheral surface of the through hole.

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