JP2022020967A - Building and building construction method - Google Patents

Abstract

To shorten a construction period without forming a fire resistive covering directly on a steel beam.SOLUTION: A building has steel beams (beams 24), wooden wall materials 32 vertically arranged on the steel beams, wall fire resistive layers 34 covering the surfaces of the wall materials 32, a plurality of small beams 42, and a ceiling fire resistive layer 46 which covers the whole lower surfaces of the plurality of small beams 42, and is arranged in a state of abutted on the wall resistive layer 34; and includes a ceiling unit 40 fixed to the steel beam, wooden floor materials 52 erected above the plurality of small beams 42, and a floor fire resistive layer 54 which covers the upper surface of the floor material 52 and is arranged in a state of abutted on the wall fire resistive layer 34 or in a state where the wall fire resistive layer 34 is abutted thereon.SELECTED DRAWING: Figure 1

Description

The present invention relates to a building and a building construction method.

The following Patent Document 1 shows a building in which the side surface of a steel beam is coated with a fireproof coating material.

JP-A-2019-65685

Generally, the steel beam is attached with wall materials at the top and bottom, and small beams are attached to the sides. Therefore, when the steel beam is covered with the fireproof coating material as in the building of Patent Document 1, the fit of the fireproof coating may be complicated at the portion where the fireproof coating interferes with the wall material, the beam, or the like. be. In this case, it takes time and effort to form the refractory coating.

In consideration of the above facts, an object of the present invention is to shorten the construction period without directly forming a fireproof coating on the steel frame beam.

The building according to claim 1 includes a steel beam, wooden wall materials arranged above and below the steel beam, a wall fireproof layer covering the surface of the wall material, a plurality of beams, and the plurality of small beams. It has a ceiling fire-resistant layer that covers the entire lower surface of the beam and is arranged so as to be abutted against the wall fire-resistant layer, and is above the ceiling unit fixed to the steel beam and the plurality of beams. It is provided with an erected wooden floor material and a floor fire-resistant layer that covers the upper surface of the floor material and is arranged in a state of being abutted against the wall fire-resistant layer or a state in which the wall fire-resistant layer is abutted. ing.

In the building according to claim 1, the steel beam is arranged in the area surrounded by the wall refractory layer, the ceiling refractory layer, and the floor refractory layer.

Specifically, the surface of the wooden wall material arranged above and below the steel beam is covered with the wall refractory layer. The ceiling refractory layer is arranged in a state of being abutted against the wall refractory layer. Further, the wall refractory layer is arranged in a state of being abutted against the floor refractory layer, or the floor refractory layer is arranged in a state of being abutted against the wall refractory layer. The ceiling fireproof layer covers the entire lower surface of the plurality of beams, and the floor fireproof layer covers the upper surface of the floor material erected above the beams.

As a result, in addition to the wall material, the beam and the floor material, the steel frame beam is arranged in the area surrounded by the wall fire resistant layer, the ceiling fire resistant layer and the floor fire resistant layer. Therefore, the steel beam is fireproof coated without directly spraying or wrapping the fireproof layer on the steel beam. Therefore, the construction period for forming the refractory coating can be shortened.

The building construction method according to claim 2 includes a step of joining a wooden wall material whose surface is covered with a wall fireproof layer to the lower surface of a steel beam, and a step of erection of the wall material on a lower floor skeleton. A step of fixing a ceiling unit having a plurality of beams and a ceiling fire-resistant layer covering the entire lower surface of the plurality of beams to the steel beam, and abutting the ceiling fire-resistant layer against the wall fire-resistant layer, and the small beam. The step of joining a wooden floor material whose upper surface is covered with a floor fire resistant layer to the beam, and the wall material of the upper floor are joined to the upper surface of the steel beam, and the wall fire resistant layer and the floor fire resistant layer are abutted against each other. It has a process.

In the building construction method according to claim 2, the steel beam is arranged in the area surrounded by the wall refractory layer, the ceiling refractory layer, and the floor refractory layer.

Specifically, the surface of the wooden wall material joined above and below the steel beam is covered with a wall refractory layer. A ceiling refractory layer and a floor refractory layer are abutted against the wall refractory layer. The ceiling fireproof layer covers the entire lower surface of the plurality of beams joined to the steel beam, and the floor fireproof layer covers the upper surface of the floor material erected above the beam.

As a result, in addition to the wall material, the beam and the floor material, the steel frame beam is arranged in the area surrounded by the wall fire resistant layer, the ceiling fire resistant layer and the floor fire resistant layer. Therefore, the steel beam is fireproof coated without directly spraying or wrapping the fireproof layer on the steel beam. Therefore, the construction period for forming the refractory coating can be shortened.

In addition, by unitizing steel beams and wall materials, girders and ceiling fireproof layers, and flooring materials and floor fireproof layers, and assembling them together in units, the construction period is compared with the construction method in which each member is assembled in sequence. It can be shortened.

The building construction method according to claim 3 is the building construction method according to claim 2, wherein the steel beam and the wall material are joined at a factory and carried to the site.

In the building construction method of claim 3, it is not necessary to perform the joining work of the steel beam and the wall material on site. Therefore, on-site work can be reduced and the construction period can be shortened.

The building construction method according to claim 4 is the building construction method according to claim 2 or 3, wherein the wall material is erected on the lower skeleton in a state where the steel beam is joined to the steel column. The building.

In the building construction method according to claim 4, the steel column, the steel beam, and the wall material are erected on the lower skeleton in an integrated state. Therefore, the start-up time of processing can be shortened as compared with the case where steel columns, wall materials and steel beams are sequentially constructed on the lower skeleton. As a result, the construction period can be shortened.

According to the present invention, the construction period can be shortened without directly forming a refractory coating on the steel frame beam.

It is a vertical sectional view which showed the structure around the steel frame beam in the building which concerns on embodiment of this invention. (A) is a perspective view showing a wall unit in a building according to an embodiment of the present invention, (B) is a perspective view showing a floor unit, and (C) is a perspective view showing a ceiling unit. .. (A) is a front view which shows the fixing member of the wall unit in the building which concerns on embodiment of this invention, and (B) is a side view. (A) is an elevation view showing a state in which a wall unit is assembled in the building construction method according to the embodiment of the present invention, and (B) is an elevation view showing a state in which the wall unit is erected on a lower floor skeleton. Is. (A) is an elevation view showing a state in which the ceiling unit is fixed to the wall unit in the building construction method according to the embodiment of the present invention, and (B) is an elevation view showing a state in which the floor unit is fixed to the ceiling unit. Is. (A) is a perspective view showing an example in which two beams are joined to the wall unit according to the embodiment of the present invention, and (B) is a continuous arrangement of wall units by abutting end faces of the wall body against each other. It is an elevation view which shows an example. (A) is a perspective view showing an example in which columns are joined to both sides of a wall unit according to an embodiment of the present invention, and (B) is an elevation view showing an example in which columns are arranged between wall bodies. It is a perspective view which shows the example which joined the pillar to one side of the wall unit which concerns on embodiment of this invention. It is a vertical sectional view which shows the modification which put the ceiling unit formed by using the wooden beam on the beam in the building which concerns on embodiment of this invention. It is a perspective view which showed the ceiling unit and the floor unit formed by using the wooden beam. It is a vertical cross-sectional view which shows the example which the floor refractory layer is opposed to the wall refractory layer 34 in the building which concerns on embodiment of this invention.

Hereinafter, the building and the building construction method according to the embodiment of the present invention will be described with reference to the drawings. The components shown by the same reference numerals in the drawings mean that they are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of components may exist. In addition, explanations may be omitted for overlapping configurations and reference numerals in the drawings. The present invention is not limited to the following embodiments, and can be carried out with appropriate modifications such as omitting or replacing the configuration within the scope of the object of the present invention.

[building]
As shown in FIG. 1, the building according to the embodiment of the present invention includes a wall unit 12 and a horizontal unit 14.

<Wall unit>
The wall unit 12 is a unit along the vertical direction. The wall unit 12 is a wall body fixed below the beam 24 via a beam 24 joined to a column 22 (see FIG. 7A), a fixing member 26 fixed above and below the beam 24, and a fixing member 26. It is a general term for members configured by including 30. In this embodiment, the wall unit 12 does not include the pillar 22.

It should be noted that "vertical" does not have to be a direction strictly along the vertical direction, and may have an inclination of about a construction error. Similarly, "horizontal" does not have to be a direction strictly along the horizontal direction, and may have a water gradient or a gradient of about a construction error.

(Beam)
The beam 24 in the wall unit 12 is a steel beam made of H-shaped steel. Wall bodies 30 are arranged above and below the beam 24.

(Wall body)
The wall body 30 includes a wooden wall material 32 and a wall fireproof layer 34 that covers the surface of the wall material 32. The wall material 32 can be formed by using various kinds of wood such as CLT (Cross Laminated Timber), LVL (Laminated Veneer Lumber), laminated lumber and plywood. The wall refractory layer 34 is a face material arranged on the surface of the wall material 32. The wall fireproof layer 34 can be formed to an appropriate thickness by using various fireproof coating materials such as a calcium silicate board and gypsum board.

FIG. 2A shows the wall unit 12 in a state where the wall refractory layer 34 is omitted. As shown in this figure, a plurality of fixing members 26 for fixing the wall material 32 to the beam 24 are joined to the beam 24. Further, notches are provided at the corners (four corners) of the wall material 32. The wall material 32 is arranged so as to be sandwiched between the fixing members 26 and sandwiched between the upper and lower beams 24 in a state where the cutout portion is in contact with the fixing member 26.

(Fixing member)
As shown in FIG. 3A, the fixing member 26 is formed in a substantially right-angled triangular shape when viewed from the front. The fixing member 26 is formed by assembling a right-angled triangular core material 26A and face materials 26B, C, and D welded to each end surface of the core material 26A. The face material 26B is welded to the end face corresponding to the adjacent side of the core material 26A, and is bolted (or welded) to the beam 24. The face material 26D is welded to the end face corresponding to the hypotenuse of the core material 26A, and the wall material 32 in the wall body 30 is in contact with the face material 26D.

As shown in FIG. 3B, the width W1 of the face materials 26B, C, and D (the width in the direction along the flange width of the beam 24) is substantially the same as the width W2 of the wall material 32 or slightly smaller than the width W2. It is said to be the width. Therefore, the fixing member 26 is arranged so as to be sandwiched between the wall refractory layer 34.

The fixing member 26 and the wall material 32 are fixed by screwing a lug screw bolt or the like in the direction indicated by the arrow N1 in FIG. 3A. Further, the wall material 32 may be fixed to the beam 24 by screwing a lug screw bolt or the like in the direction indicated by the arrow N2.

<Horizontal unit>
As shown in FIG. 1, the horizontal unit 14 is a general term for members joined to a wall unit 12 to form a slab of a building. The horizontal unit 14 includes a ceiling unit 40 and a floor unit 50.

(Ceiling unit)
The ceiling unit 40 includes a beam 42, a base material 44, and a ceiling material 46. The beam 42 is made of H-shaped steel and is joined to the beam 24 via a gusset plate 24A. Further, a plurality of small beams 42 are joined to one beam 24.

As shown in FIG. 2C, a base material 44 is joined to the lower surface of the beam 42. The base material 44 is made of light iron, and a plurality of the base materials 44 are arranged at predetermined intervals in the extending direction of the beam 42. Further, the base material 44 is bridged over the small beams 42 adjacent to each other.

A ceiling material 46 is laid on the lower surface of the base material 44. The ceiling material 46 is made of a refractory material and is fixed to the base material 44 by using screws or the like. Further, the ceiling material 46 is arranged so as to cover the entire lower surface of the plurality of beam 42.

The ceiling material 46 is an example of the ceiling fire-resistant layer in the present invention, and is formed to an appropriate thickness by using various fire-resistant covering materials such as a calcium silicate board and gypsum board. Further, the ceiling material 46 can also be formed by combining a non-fireproof material such as a wooden material and a fireproof coating material.

As shown in FIG. 1, the ceiling material 46 is arranged in a state of being abutted against the wall refractory layer 34 on the living room R1 side. Further, a fireproof sealing material C is arranged at the inside corner formed by the ceiling material 46 and the wall fireproof layer 34. The fireproof sealing material C is a caulking material provided for the purpose of filling the gap between the ceiling material 46 and the wall fireproof layer 34.

In addition, in the "butted state" in the present invention, in addition to the state where the end face of the ceiling material 46 is in contact with the wall fireproof layer 34, the gap between the end face of the ceiling material 46 and the wall fireproof layer 34 is fireproof. The state of being filled with the sealing material C is included. The same applies to the relationship between the floor refractory layer 54 and the wall refractory layer 34, which will be described later.

(Floor unit)
The floor unit 50 includes a wooden floor material 52 and a floor fireproof layer 54. The floor material 52 can be formed by using various kinds of wood such as CLT, LVL, laminated lumber and plywood.

The floor fireproof layer 54 is a face material arranged on the upper surface of the floor material 52, and is formed to an appropriate thickness by using various fireproof covering materials such as a calcium silicate board and gypsum board. As shown in FIG. 2B, the floor refractory layer 54 is fixed to the floor material 52 by using a fixing material such as a screw V1.

As shown in FIG. 1, the floor unit 50 is fixed to the ceiling unit 40. Specifically, the beam 42 of the ceiling unit 40, the floor material 52 of the floor unit 50, and the floor refractory layer 54 are fixed to each other with bolts B.

Further, in a state where the floor unit 50 is fixed to the ceiling unit 40, the floor material 52 and the floor refractory layer 54 are arranged so as to overlap with the beam 24 (in a state where they overlap in a plan view). Further, the floor refractory layer 54 is arranged with the wall refractory layer 34 on the living room R2 side abutted against the floor refractory layer 54.

[Building construction method]
In the building construction method according to the embodiment of the present invention, first, as shown in FIG. 4A, a wooden wall whose surface is covered with a wall fireproof layer 34 on the lower surface of the beam 24. The material 32) is fixed. As a result, the wall unit 12 is formed. The wall unit 12 may be assembled at the construction site of the building or at the factory. If assembled at the factory, on-site work can be reduced and the construction period can be shortened.

In this embodiment, the lower end portion of the wall material 32 is not covered with the wall fireproof layer 34 (non-covered portion 32A). The vertical width of the uncovered portion 32A is the width H1 from the lower end surface of the wall material 32. The width H1 is substantially the same as the width H2 of the floor unit 50 or slightly larger than the width W2.

Next, as shown in FIG. 4B, the wall body 30 is erected on the lower skeleton. In this embodiment, the lower floor skeleton is formed by combining a wall unit 12 and a horizontal unit 14.

Specifically, the wall material 32 in the wall unit 12 is placed on the beam 24 on the lower floor. The wall material 32 does not necessarily have to be joined to the fixing member 26 fixed to the upper surface of the beam 24 on the lower floor. As shown in FIG. 2A, the wall material 32 is arranged between the fixing members 26 and can be positioned without joining the wall material 32 to the fixing member 26. Further, a shearing force can be transmitted between the beam 24 on the lower floor and the wall material 32.

Further, at this time, the wall refractory layer 34 in the wall unit 12 is arranged so as to abut against the floor refractory layer 54 on the lower floor. A fireproof sealing material is appropriately laid in the corner formed by the floor fireproof layer 54 and the wall fireproof layer 34.

Next, as shown in FIG. 5A, the ceiling unit 40 is fixed to the wall unit 12. Specifically, the beam 42 in the ceiling unit 40 is bolted to the beam 24 in the wall unit 12 via the gusset plate 24A.

At this time, the ceiling material 46 as the ceiling refractory layer is abutted against the wall refractory layer 34 and arranged. Further, a fireproof sealing material C is laid in the inside corner formed by the ceiling material 46 and the wall fireproof layer 34.

Next, as shown in FIG. 5B, the floor unit 50 is fixed to the beam 42. The floor unit 50 and the beam 42 are fixed by using bolts B. The beam 42 and the floor unit 50 may be fixed in advance. That is, a horizontal unit 14 in which the ceiling unit 40 and the floor unit 50 are combined may be formed in advance, and the horizontal unit 14 may be fixed to the beam 24.

The ceiling unit 40, the floor unit 50, and the horizontal unit 14 may be assembled at the construction site of the building or at the factory. If assembled at the factory, on-site work can be reduced and the construction period can be shortened.

By the above steps, the wall unit 12 and the horizontal unit 14 corresponding to one layer of the building are assembled. Subsequently, in order to assemble the wall unit 12 and the horizontal unit 14 on the upper floor, the steps described with reference to FIGS. 4 (A), (B), 5 (A), and (B) are repeated.

[Variations of wall units]
In the above embodiment, as in the wall unit 12 shown in FIGS. 2 (A) and 4 (A), the wall unit contains only "one" beam 24, but the embodiment of the present invention is carried out. The form is not limited to this.

For example, as in the wall unit 12A shown in FIG. 6A, the wall unit may include "two" beams 24 by fixing the beams 24 above and below the wall body 30, respectively.

As shown in FIG. 6B, the wall units 12A can be continuously arranged by abutting the end faces of the wall bodies 30 against each other. Further, although not shown, the wall unit 12 may also be continuously arranged by abutting the end faces of the wall bodies 30 against each other.

Further, on the surface of the wall units 12 and 12A, the wall units 12 and 12A extending in the intersecting direction (the front-back direction of the paper surface in FIG. 6B) can be abutted and arranged.

Further, as in the wall unit 12B shown in FIG. 7A, the wall unit may include a pillar 22. In this case, for example, as shown in FIG. 7B, by arranging the wall unit 12A adjacent to the wall unit 12B, it is possible to form a frame in which the pillars 22 are arranged between the wall bodies 30. In other words, the wall body 30 can be arranged on the structure surrounded by the columns 22 and the beams 24.

In addition, as a configuration in which the pillar 22 is included in the wall unit, in addition to the configuration in which the pillar 22 is joined to both ends of the beam 24 as in the wall unit 12B of FIG. 7A, the beam is configured as in the wall unit 12C of FIG. A configuration in which the pillar 22 is joined only to one end of the 24 can be adopted.

In this way, by constructing the wall unit in which the pillar 22, the beam 24, and the wall body 30 are integrated, the standing of processing is compared with the case where the pillar 22, the wall body 30, and the beam 24 are sequentially constructed. The raising time can be shortened. As a result, the construction period can be shortened.

[Action and effect]
In the building and the building construction method according to the embodiment of the present invention, the beam 24 is arranged in the area surrounded by the wall refractory layer 34, the ceiling material 46 as the ceiling refractory layer, and the floor refractory layer 54.

Specifically, the surface of the wooden wall material 32 arranged above and below the beam 24 is covered with the wall refractory layer 34. A ceiling material 46 is abutted against the wall refractory layer 34 (the wall refractory layer 34 on the lower floor and the wall refractory layer 34 facing the living room R1). Further, the wall refractory layer 34 (the wall refractory layer 34 on the upper floor and the wall refractory layer 34 facing the living room R2) is arranged so as to abut against the floor refractory layer 54. The ceiling material 46 covers the entire lower surface of the plurality of beam 42, and the floor fireproof layer 54 covers the upper surface of the floor material 52 erected above the beam 42.

As a result, the wall material 32, the beam 42, the floor material 52, and the beam 24 are arranged in the area surrounded by the fire-resistant layer such as the wall fire-resistant layer 34, the ceiling material 46, and the floor fire-resistant layer 54. Therefore, the beam 24 is covered with fire resistance without directly spraying or winding the fire resistance layer on the beam 24. Therefore, the construction period for forming the refractory coating can be shortened.

In the present embodiment, the "region surrounded by the refractory layer" indicates a region covered with the refractory material when viewed from the living rooms R1 and R2 such as the fire room.

Further, in the building and the building construction method according to the embodiment of the present invention, the wooden wall material 32 is used in combination with the steel beam 24 and the steel column 22. Therefore, the rigidity of the building can be increased as compared with a configuration in which a wooden slab or a wall material is used as a structural material and a steel beam 24 or a pillar 22 is not used.

Further, in the building and the building construction method according to the embodiment of the present invention, the wall body 30 is fixed to the beam 24. Further, the floor material 52 and the ceiling material 46 are also fixed to the beam 24 via the beam 42. That is, the face material constituting the building is fixed to the beam 24. Therefore, as compared with a structure in which a wooden wall material is fixed to a wooden slab without using a beam, for example, the fitting of the joint portion between the face materials can be simplified.

Further, in the building and the building construction method according to the embodiment of the present invention, each member is unitized. Specifically, as shown in FIGS. 2A to 2C, the wall unit (beam 24, wall material 32 and wall fireproof layer 34) and ceiling unit 40 (beam 42, base material 44 and ceiling material 46). ) And the floor unit 50 (floor material 52 and floor fireproof layer 54) are unitized respectively. By assembling and constructing the building in units of units in this way, it is possible to shorten the construction period as compared with the construction method in which each member is sequentially assembled.

[Other embodiments]
In the above embodiment, the ceiling unit 40 is formed by using a steel beam 42, and the beam 42 is joined to the beam 24, but the embodiment of the present invention is not limited to this. For example, the beam may be made of wood and may not be joined to the beam 24, as in the beam 62 in the ceiling unit 60 shown in FIGS. 9 and 10.

Specifically, the ceiling material 64 is fixed to the beam 62 in the ceiling unit 60. The ceiling material 64 is formed by stacking a plurality of refractory materials or by superimposing a refractory material and a non-refractory material. Further, the wall refractory layer 36 in the wall body 31 of the wall unit 12D is formed by stacking a plurality of gypsum boards.

The ceiling unit 60 is mounted on the wall unit 12D by mounting the ceiling material 64 on the lower flange of the beam 24. At this time, the ceiling material 64 as the ceiling refractory layer is abutted against the wall refractory layer 36 and arranged. Further, a fireproof sealing material C is laid in the inside corner formed by the ceiling material 64 and the wall fireproof layer 36.

The term "fixing the ceiling unit to the steel beam" in the present invention includes an embodiment in which the ceiling unit 60 is mounted on the beam 24 in this way.

With the ceiling unit 60 mounted on the wall unit 12D, the floor unit 70 is fixed on the ceiling unit 60. In the floor unit 70, the floor refractory layer 74 is formed by stacking a plurality of gypsum boards.

In order to fix the floor unit 70 on the ceiling unit 60, first, the floor material 52 is placed on the beam 24. Next, the floor material 52 and the beam 62 are fixed with the screw V2. Further, the floor fireproof layer 74 is placed on the floor material 52. The floor fireproof layer 74 and the floor material 52 are fixed to the beam 24 with bolts B or screws. Further, the floor refractory layer 74 and the floor material 52 are fixed with the screw V1.

In the above embodiment, as shown in FIG. 4A, an uncovered portion 32A that is not covered with the wall fireproof layer 34 is formed at the lower end portion of the wall material 32, but the embodiment of the present invention is Not limited to this. For example, as shown in FIG. 11, the entire surface of the wall material 32 may be covered with the wall refractory layer 34.

At this time, the floor refractory layer 54 is arranged so as to abut against the wall refractory layer 34 in the wall unit 12. A fireproof sealing material (not shown) is appropriately laid in the corner formed by the floor fireproof layer 54 and the wall fireproof layer 34.

Further, in the above embodiment, the floor refractory layers 54 and 74 are formed of a plate-like material such as a calcium silicate board and a gypsum board, but the embodiment of the present invention is not limited to this. For example, the floor refractory layer may be formed by using cast-in-place mortar or concrete. In this case, the timing of constructing the floor refractory layer may be either before or after the construction of the wall unit 12 or the like.

Further, in the above embodiment, the wall material 32 is formed by using various kinds of wood such as CLT (Cross Laminated Timber), LVL (Laminated Veneer Lumber), laminated lumber and plywood. Not limited to this. For example, the wall material may be formed by combining a lightweight steel frame (LGS: Light Gauge Steel) and a face material such as plywood.

24 beams (steel beams)
32 Walls 34 Wall refractory layers 36 Wall refractory layers 40 Ceiling units 42 Beams 46 Ceiling materials (ceiling refractory layers)
52 Floor material 54 Floor fireproof layer 60 Ceiling unit 62 Beam 64 Ceiling material (ceiling fireproof layer)
74 Floor refractory layer

Claims (4)

Steel beams and
Wooden wall materials placed above and below the steel beam,
A wall refractory layer that covers the surface of the wall material,
A ceiling unit having a plurality of beams and a ceiling refractory layer arranged in a state of being abutted against the wall refractory layer while covering the entire lower surface of the plurality of beams, and fixed to the steel frame beam. When,
The wooden flooring erected above the plurality of beams and
A floor refractory layer that covers the upper surface of the floor material and is arranged so as to be abutted against the wall refractory layer or with the wall refractory layer abutted against the wall refractory layer.
Building with. The process of joining a wooden wall material whose surface is covered with a wall refractory layer to the lower surface of the steel beam,
The process of erection of the wall material on the lower floor frame and
A step of fixing a ceiling unit having a plurality of beams and a ceiling refractory layer covering the entire lower surface of the plurality of beams to the steel frame beam, and abutting the ceiling refractory layer against the wall fireproof layer.
A process of joining a wooden floor material whose upper surface is covered with a floor refractory layer to the beam.
A step of joining the wall material on the upper floor to the upper surface of the steel frame beam and abutting the wall fireproof layer and the floor fireproof layer.
How to build a building with. The building construction method according to claim 2, wherein the steel beam and the wall material are joined at a factory and carried to the site. The building construction method according to claim 2 or 3, wherein the wall material is erected on the skeleton of the lower floor in a state where the steel beam is joined to the steel column.

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