JP6842987B2 - Building bearing wall structure - Google Patents

Description

The present invention relates to a load-bearing wall structure of a building.

In the fireproof coating structure of Patent Document 1, a fireproof board bent in a U shape is wound around a steel frame column adjacent to the outer wall, and three surfaces of the steel frame column are covered.

Japanese Patent Application Laid-Open No. 9-100587

As a load-bearing wall structure of a building, there is a structure in which a plurality of columns are connected by joining a fire-resistant element such as a lattice material to a plurality of columns. In this structure, when each pillar is covered with a refractory material, the refractory material must be provided avoiding the portion where the lattice materials of a plurality of pillars are joined. Therefore, the shape and size of the joint portion must be adjusted. After cutting out a part of the refractory material, the pillars will be covered with the refractory material.

However, it is difficult to cut out the refractory material according to the shape and size of the joint portion, man-hours are required, and a gap may be formed between the joint portion and the refractory material. Then, when a gap is formed between the joint portion and the refractory material, the refractory resistance of the plurality of columns is lowered. That is, in the bearing wall structure of a building, there is room for improvement in order to secure the fire resistance of a plurality of columns and improve the workability.

An object of the present invention is to obtain a bearing wall structure of a building capable of ensuring fire resistance of a plurality of columns and improving workability.

The load-bearing wall structure of the building according to the first aspect includes a plurality of columns connected by a lattice material on the indoor side with respect to the outer wall of the building, a first refractory portion covering the inner side surface of the plurality of columns on the indoor side, and the above. It has a second refractory portion extending from the first refractory portion to the outer wall and covering a second side surface opposite to the first side surface to which the lattice materials of the plurality of pillars are joined.

In the load-bearing wall structure of the building according to the first aspect, the first refractory portion covers the inner side surface of the plurality of columns on the indoor side. Further, the second refractory portion extends from the first refractory portion to the outer wall and covers the second side surface opposite to the first side surface to which the lattice materials of the plurality of pillars are joined. As a result, since the plurality of pillars are surrounded by the outer wall, the first refractory portion, and the second refractory portion, the fire resistance of the plurality of pillars can be ensured. Further, since it is not necessary to cut out the refractory material on the first side surface to which the lattice materials of the plurality of columns are joined, the workability can be improved.

The first refractory portion of the load-bearing wall structure of the building according to the second aspect is divided into an upper portion and a lower portion below the center of the first refractory portion in the height direction of the building.

In the bearing wall structure of the building according to the second aspect, the air whose temperature has risen due to the occurrence of a fire moves from the lower side to the upper side of the building. Therefore, in the first refractory portion, the temperature of the upper part rises with respect to the temperature of the lower part. Here, since the boundary portion between the upper part and the lower part of the first refractory portion is located below the center in the height direction of the building, the boundary portion is located above the center in the height direction. Compared to the structure, the high temperature of this boundary portion is suppressed. As a result, it is possible to suppress a decrease in the fire resistance of the plurality of columns.

A base material for supporting the first refractory portion is provided on the pillar of the load-bearing wall structure of the building according to the third aspect, and the first refractory portion is on one side and the other side in the direction in which the plurality of pillars are arranged. A covering material is provided between the first refractory portion and the base material so as to cover the divided portion of the first refractory portion from the base material side.

In the bearing wall structure of the building according to the third aspect, the covering material covers the divided portion of the first fireproof portion from the base material side. Therefore, even if a gap is formed by heat in the divided portion of the first refractory portion and the high temperature air may move toward the pillar, the covering material blocks the movement of the high temperature air. As a result, it is possible to suppress a decrease in the fire resistance of the plurality of columns.

As described above, in the bearing wall structure of the building according to the present invention, it is possible to secure the fire resistance of a plurality of columns and improve the workability.

It is a block diagram of the wall structure which concerns on this embodiment. It is a front view which shows the bearing wall which concerns on this embodiment. It is explanatory drawing which shows the state which arranged the refractory plate between the refractory board and a pillar which concerns on this embodiment. It is a block diagram of the refractory board which concerns on this embodiment. It is explanatory drawing which enlarged the side joint part of the refractory board which concerns on this embodiment. It is a block diagram of the refractory board which concerns on the modification of this embodiment.

An example of the bearing wall structure of the building according to the present embodiment will be described.

〔overall structure〕
FIG. 1 shows a load-bearing wall structure 20 as an example of a load-bearing wall structure of a building applied to a building 10. Details of the bearing wall structure 20 will be described later. In the following description, the girder direction of the building 10 will be referred to as the X direction, the wife direction will be referred to as the Y direction, and the vertical direction (height direction) will be referred to as the Z direction. The X, Y and Z directions are orthogonal to each other. As an example, the building 10 includes a skeleton of a steel frame structure in which a column portion 12 and a beam portion (not shown) are assembled on a foundation, and an outer wall 16 erected in the Z direction.

The column portion 12 includes columns 13, 14 and 15, and the lower end portion in the Z direction is connected to the foundation beam and the upper end portion in the Z direction is connected to the ceiling beam. The pillars 13, 14 and 15 are arranged in this order on the indoor side in the Y direction with respect to the outer wall 16 at a predetermined interval in the X direction as an example of one direction. In other words, the X direction is the direction in which the pillars 13, 14, and 15 (plurality of pillars) are lined up. Further, the columns 13, 14 and 15 are made of square steel as an example, and have the same size and shape, respectively.

The pillar 13 has a side surface 13A on the outdoor side (outer wall 16 side) in the Y direction, an inner side surface 13B on the indoor side, a side surface 13C on one side in the X direction, and a side surface 13D on the other side. The pillar 14 has a side surface 14A on the outdoor side in the Y direction, an inner side surface 14B on the indoor side, a side surface 14C on one side in the X direction, and a side surface 14D on the other side. The pillar 15 has a side surface 15A on the outdoor side in the Y direction, an inner side surface 15B on the indoor side, a side surface 15C on one side in the X direction, and a side surface 15D on the other side.

The side surface 13C and the side surface 14D, and the side surface 14C and the side surface 15D face each other in the X direction. The inner side surface 13B, the inner side surface 14B, and the inner side surface 15B are aligned in the X direction. The side surface 13C, the side surface 14C, the side surface 14D, and the side surface 15D are examples of the first side surface. The side surface 13D and the side surface 15C are examples of the second side surface. The length of the distance between the side surface 13C and the side surface 14D in the X direction and the length of the distance between the side surface 14C and the side surface 15D in the X direction are substantially the same.

The outer wall 16 is composed of a plurality of outer wall panels 17 arranged in the X direction. Each outer wall panel 17 has a predetermined width in the X direction and a length in the Z direction corresponding to the floor height of the building 10, and is attached to an outer wall frame (not shown). As an example, a backer material 19A and a refractory joint material 19B are provided at the joint 18 of each outer wall panel 17. The three joints 18 shown in FIG. 1 are arranged in the Y direction with the pillar 13, the pillar 14, and the pillar 15 as an example. In other words, when the outer wall 16 is viewed from the indoor side in the Y direction, no joint 18 is arranged between the pillar 13 and the pillar 14, and between the pillar 14 and the pillar 15.

[Main part composition]
Next, the bearing wall structure 20 will be described.

As an example, the load-bearing wall structure 20 has columns 13, 14, 15 connected by two lattice members 22, and a refractory portion 24. Further, the load-bearing wall structure 20 has a light iron base 32 and a light iron base 33 as an example of a base material, a refractory plate 34 as an example of a covering material, and a gypsum board 39. In FIG. 1, the lattice material 22 is shown in a simplified manner. The two lattice members 22 and the columns 13, 14 and 15 are collectively referred to as a bearing wall 21.

(Pillar)
As shown in FIG. 2, a connecting member 36 is provided at the upper ends of the columns 13, 14, and 15 in the Z direction. The connecting member 36 is fastened and fixed to the ceiling beam 37 by bolts and nuts (not shown). Further, the lower ends of the columns 13, 14 and 15 in the Z direction are fastened and fixed by bolts to anchors (not shown) provided on the foundation beam 38.

(Lattice material)
As an example, the lattice material 22 is formed by bending round steel, and has a plurality of straight portions 22A and 22B extending in the Z direction and continuous straight portions 22A and 22B at the ends of the straight portions 22A and 22B. It has a plurality of inclined portions 22C extending in an oblique direction. The plurality of straight portions 22A and 22B and the plurality of inclined portions 22C are formed in a trapezoidal wavy shape when viewed from the Y direction. The straight portion 22A is shorter in the Z direction than the straight portion 22B. The lattice material 22 connecting the pillars 13 and the pillars 14 and the lattice material 22 connecting the pillars 14 and the pillars 15 are arranged symmetrically with respect to the pillars 14 in the X direction.

A lattice coma 23 is provided on the straight line portion 22B. The lattice coma 23 is composed of a metal plate whose thickness direction is the X direction. The length of the lattice piece 23 in the Z direction is shorter than the length of the straight line portion 22B in the Z direction. Here, between the pillar 13 and the pillar 14, the lattice coma 23 is joined to the side surface 13C, and the straight line portion 22A is joined to the side surface 14D. Between the pillar 14 and the pillar 15, the lattice coma 23 is joined to the side surface 15D, and the straight line portion 22A is joined to the side surface 14C.

In the lattice material 22, the bent portion between the straight portions 22A and 22B and the inclined portion 22C is a plastic hinge portion. This plastic hinge portion corresponds to an energy absorbing portion that bends and deforms to absorb vibration energy when an external force such as a seismic force is applied, and is a portion where a plastic hinge is formed by yielding a cross section due to a load. Further, in the lattice material 22, the bending deformation region of the plastic hinge portion is secured by providing the lattice frame 23.

<Fireproof part>
As shown in FIG. 1, the refractory portion 24 extends from the first refractory portion 26 to the outer wall 16 and the first refractory portion 26 arranged indoors in the Y direction with respect to the columns 13, 14, and 15. It has two second refractory portions 28.

(1st refractory part)
The first refractory portion 26 covers the inner side surfaces 13B, 14B, and 15B from the indoor side in the Y direction. Further, the first refractory portion 26 extends in the X direction from the side surface 13D to the side surface 15C, and the space portion between the pillar 13 and the pillar 14 and the space portion between the pillar 14 and the pillar 15 are also in the Y direction. It covers from the indoor side of.

The first refractory portion 26 shown in FIG. 4 is composed of a calcium silicate plate as an example. Further, the first refractory portion 26 is divided into an upper portion 26A which is an upper portion in the Z direction and a lower portion 26B which is a lower portion in the Z direction. Further, the upper portion 26A is divided into one side and the other side in the X direction. As an example, the upper 26A is divided into two refractory boards 42. The lower portion 26B is composed of one refractory board 44 as an example.

The refractory board 42 is formed in a rectangular shape with the X direction as the lateral direction and the Z direction as the longitudinal direction when viewed from the Y direction. The refractory board 42 has a length L1 in the X direction, a length L2 in the Z direction, and a thickness t1 in the Y direction. The two refractory boards 42 are arranged in contact with each other in the X direction with the upper end surface and the lower end surface in the Z direction aligned.

The refractory board 44 is formed in a rectangular shape with the X direction as the longitudinal direction and the Z direction as the lateral direction when viewed from the Y direction. The refractory board 44 has a length L3 in the X direction, a length L4 in the Z direction, and a thickness t1 in the Y direction (not shown). As an example, L3 = 2 × L1 is set, and L2> L4 is set. On the upper end surface of the refractory board 44 in the Z direction, the lower end surfaces of the two refractory boards 42 in the Z direction are placed. Further, the indoor and outdoor surfaces of the two refractory boards 42 and the indoor and outdoor surfaces of the one refractory board 44 are aligned in the Z direction, respectively.

The space between the two refractory boards 42 in the X direction (boundary portion) is referred to as a vertical joint 46. Further, the space (boundary portion) between the two refractory boards 42 and one refractory board 44 in the Z direction is referred to as a horizontal joint 48. The vertical joint 46 and the horizontal joint 48 are formed in an inverted T shape when viewed from the Y direction. As an example, the vertical joint 46 is arranged at a position overlapping the pillar 14 (see FIG. 1) when viewed from the Y direction. When the first refractory portion 26 is viewed from the Y direction, a virtual line along the X direction representing the height of the center of the first refractory portion 26 in the Z direction is referred to as a center line CL. In FIG. 4, the center line CL is indicated by an alternate long and short dash line.

Here, since L2> L4 as described above, the horizontal joint 48 is located below the center line CL in the Z direction. In other words, the first refractory portion 26 is divided into an upper portion 26A and a lower portion 26B below the center of the first refractory portion 26 in the Z direction.

The first refractory portion 26 shown in FIG. 3 is formed with a plurality of screw holes 45 which are penetrated in the Y direction and to which screws 66 or screws 68, which will be described later, are fastened.

As shown in FIG. 5, a refractory foam material 49 formed in a tape shape is attached to the vertical joint 46 and the horizontal joint 48 as an example. The refractory foam material 49 is configured to expand (increase in volume) when heated. That is, in the vertical joints 46 and the horizontal joints 48, when the temperature of the first refractory portion 26 rises, the refractory foam material 49 expands, making it difficult to form gaps.

(2nd refractory part)
As an example, the two second refractory portions 28 shown in FIG. 1 are composed of a calcium silicate plate. Further, as an example, the two second refractory portions 28 extend along the Y direction from the first refractory portion 26 to the outer wall 16 on both outer sides of the first refractory portion 26 with respect to both ends in the X direction. As a result, the two second refractory portions 28 cover the side surface 13D and the side surface 15C on the opposite side of the side surface 13C and the side surface 15D in the X direction when viewed from the X direction.

As shown in FIG. 4, the second refractory portion 28 is divided into an upper portion 28A which is an upper portion in the Z direction and a lower portion 28B which is a lower portion in the Z direction. The upper portion 28A is composed of one refractory board 52. The lower portion 28B is composed of one refractory board 54. Further, as shown in FIG. 1, the refractory board 52 and the refractory board 54 are adhered to the side surface 13D and the side surface 15C from the outside in the X direction as an example. Further, the refractory board 52 and the refractory board 54 are fixed to both ends of the first refractory portion 26 in the X direction by using nails 63 as an example. As a result, the refractory board 52 and the refractory board 54 cover the side surface 13D and the side surface 15C when viewed from the X direction.

The refractory board 52 shown in FIG. 4 is formed in a rectangular shape with the Y direction as the lateral direction and the Z direction as the longitudinal direction when viewed from the X direction. Further, as an example, the refractory board 52 has a length L5 (<L1) in the Y direction, a length L2 in the Z direction, and a thickness t2 (= t1) in the X direction. The refractory board 54 is formed in a rectangular shape with the Y direction as the lateral direction and the Z direction as the longitudinal direction when viewed from the X direction. Further, as an example, the refractory board 54 has a length L5 in the Y direction, a length L4 in the Z direction, and a thickness t2 in the X direction.

As shown in FIG. 1, the first refractory portion 26 and the second refractory portion 28 are arranged in a U shape that opens toward the outdoor side in the Y direction when viewed from the Z direction. The first refractory portion 26 and the second refractory portion 28 surround the pillars 13, 14, and 15 together with the outer wall 16.

In the bearing wall structure 20, rock wool 56 as a non-combustible heat insulating material is provided between the pillar 13 and the outer wall 16, between the pillar 14 and the outer wall 16, and between the pillar 15 and the outer wall 16, respectively. It is filled. Further, as an example, a plate-shaped rigid urethane foam 58 as a heat insulating material is provided between the lattice material 22 and the outer wall 16. A spacer 59 for adjusting the distance is provided between the rigid urethane foam 58 and the outer wall 16.

<Light iron base>
As an example, the light iron base 32 has a rectangular shape with the X direction as the longitudinal direction and the Y direction as the lateral direction, and is formed into a square tube shape with the Z direction as the axial direction. Has been done. Further, as an example, the light iron base 32 is provided at one place between the pillar 13 and the pillar 14 and in the space between the lattice material 22 and the refractory board 42, and between the pillar 14 and the pillar 15 and the lattice material. A total of two locations are provided in the space between the 22 and the fireproof board 42. Specifically, the two light iron bases 32 are attached to the side surface 13C and the side surface 15D via the bracket 62.

As shown in FIG. 3, the bracket 62 has a first joint portion 62A along the X direction and a second joint portion 62B along the Y direction when viewed from the Z direction. In other words, the bracket 62 has an L-shaped cross section when viewed from the Z direction. The side surface 32A on the indoor side of the light iron base 32 shown in FIG. 1 in the Y direction is arranged on the indoor side with respect to the inner side surface 13B and the inner side surface 15B when viewed from the X direction.

As an example, the light iron base 33 has a rectangular shape with the X direction as the longitudinal direction and the Y direction as the lateral direction, and is formed into a square cylinder shape with the Z direction as the axial direction. Has been done. Further, as an example, the light iron base 33 is provided at one place between the pillar 13 and the pillar 14 and in the space between the lattice material 22 and the refractory board 42, and between the pillar 14 and the pillar 15 and the lattice material. A total of two locations are provided in the space between the 22 and the fireproof board 42.

As shown in FIG. 3, the two light iron bases 33 are attached to the side surface 14C and the side surface 14D via the bracket 62. Further, the side surface 33A on the indoor side of the light iron base 33 in the Y direction is arranged so as to be aligned with the inner side surface 14B when viewed from the X direction. That is, the length of the light iron base 33 in the Y direction is shorter than the length of the light iron base 32 (see FIG. 1) in the Y direction.

On the indoor side wall of the light iron base 32 and the indoor side wall of the light iron base 33, a screw hole 35 is formed which penetrates the side wall in the Y direction and to which the screw 66 and the screw 68 are fastened. In other words, the screw 66 and the screw 68 are fastened to the screw hole 35 with the Y direction as the axial direction. Further, the screw 66 and the screw 68 have the same configuration except for the length in the Y direction. The screw 68 is longer in the Y direction than the screw 66 so that the gypsum board 39 can be attached.

Here, the light iron base 33 is fastened together with the central portion of the first refractory portion 26 in the X direction and the refractory plate 34 described later by using a screw 66. As a result, the first refractory portion 26 and the refractory plate 34 are attached to the light iron base 33. In other words, the light iron base 33 supports the central portion of the first refractory portion 26 in the X direction from the outdoor side in the Y direction.

Both ends of the first refractory portion 26 in the X direction are jointly fastened to the light iron base 32 shown in FIG. 1 using screws 66. Further, the light iron base 32 is fastened together with both ends of the first refractory portion 26 in the X direction and the gypsum board 39 by using screws 68. As a result, the first refractory portion 26 and the gypsum board 39 are attached to the light iron base 32. The light iron base 32 supports both ends of the first refractory portion 26 in the X direction from the outdoor side in the Y direction.

<Fireproof plate>
As shown in FIG. 3, a refractory plate 34 is provided between the first refractory portion 26, the pillar 14, and the two light iron bases 33. The refractory plate 34 is made of a steel plate as an example. Further, the refractory plate 34 is arranged (along the XX plane) with the Y direction as the thickness direction.

As an example, the length of the refractory plate 34 in the X direction is longer than the length from one side surface of the light iron base 33 on one side in the X direction to the other side surface of the light iron base 33 on the other side. The length of the refractory plate 34 in the Z direction is longer than the length of the vertical joint 46 in the Z direction and shorter than the length of the first refractory portion 26 in the Z direction. That is, when viewed from the Y direction, the refractory plate 34 has a divided portion (a part of the vertical joint 46 and the horizontal joint 48 (see FIG. 4)) of the first refractory portion 26 on the light iron base 33 side (see FIG. 4). It covers from the outdoor side in the Y direction). The refractory plate 34 is formed with a through hole 34A that penetrates in the Y direction and through which screws 66 and screws 68 are inserted.

(Gypsum board)
As shown in FIG. 1, a gypsum board 39 is provided on the indoor side in the Y direction with respect to the first refractory portion 26 and the second refractory portion 28. The gypsum board 39 is arranged (along the XX plane) with the Y direction as the thickness direction. The length of the gypsum board 39 in the X direction is, for example, longer than the length from the second refractory portion 28 on one side to the second refractory portion 28 on the other side in the X direction. As an example, the length of the gypsum board 39 in the Z direction is substantially the same as the length L2 + L4 (see FIG. 4) of the first refractory portion 26 in the Z direction.

The gypsum board 39 is fastened to the light iron base 32 and the light iron base 33 by using screws 68 in a state of being overlapped with the first refractory portion 26 from the indoor side in the Y direction. In other words, the first refractory portion 26 is sandwiched between the light iron base 32 and the gypsum board 39, and is sandwiched between the fireproof plate 34 and the gypsum board 39.

[Action]
Next, the operation of this embodiment will be described.

In the bearing wall structure 20 shown in FIG. 1, the inner side surfaces 13B, 14B, 15B of the columns 13, 14, 15 are covered from the indoor side by the first refractory portion 26. Further, the side surfaces 13D and 15C are covered with the second refractory portion 28. That is, since the pillars 13, 14 and 15 are surrounded by the outer wall 16, the first refractory portion 26 and the second refractory portion 28 when viewed from the Z direction, fire resistance can be ensured. Further, in the load-bearing wall structure 20, it is not necessary to individually surround the columns 13, 14 and 15 by enclosing the entire columns 13, 14 and 15 together. Therefore, it is not necessary to cut out the refractory material on the side surfaces 13C, 14C, 14D, and 15D to which the lattice material 22 is joined, so that the workability can be improved.

Further, in the bearing wall structure 20 shown in FIG. 4, the air whose temperature has risen due to the occurrence of a fire moves from the lower side to the upper side in the Z direction of the building 10. Therefore, in the first refractory portion 26, the temperature of the upper portion 26A rises with respect to the temperature of the lower portion 26B in the Z direction. Here, since the horizontal joint 48, which is the boundary between the upper part 26A and the lower part 26B, is located below the center line CL in the Z direction, the horizontal joint 48 is located above the center in the Z direction. Compared to the structure, the horizontal joint 48 is prevented from becoming hot. As a result, it is possible to suppress a decrease in the fire resistance of the columns 13, 14 and 15 (see FIG. 1).

Further, in the bearing wall structure 20 shown in FIG. 3, the refractory plate 34 covers the vertical joint 46, which is a divided portion of the first refractory portion 26, from the light iron base 33 side. Therefore, even if a gap is formed in the vertical joint 46 of the first refractory portion 26 due to heat and the high temperature air may move toward the pillar 14, the refractory plate 34 blocks the movement of the high temperature air. .. As a result, it is possible to suppress a decrease in the fire resistance of the pillar 14 as compared with a configuration without the fire resistance plate 34.

The present invention is not limited to the above embodiment.

As shown in FIG. 6, in the load-bearing wall structure 20, it is not necessary to form the vertical joint 46 from the lower end to the upper end of the first refractory portion 26 in the Z direction to form the horizontal joint 48 (see FIG. 4). Further, in the bearing wall structure 20 shown in FIG. 4, the vertical joints 46 and the horizontal joints 48 may not be formed. Further, in the bearing wall structure 20, the number of vertical joints 46 and horizontal joints 48 is not limited to one, and may be two or more (plural).

Further, in the bearing wall structure 20 shown in FIG. 3, the formation position (division position) of the vertical joint 46 is shifted in the X direction so that the vertical joint 46 does not line up with the pillar 14 in the Y direction, and the fireproof plate 34 is not provided. You may. In this case, the portion where the vertical joint 46 is formed may be covered from the outdoor side in the Y direction by using the light iron base 33.

The first refractory portion 26 and the second refractory portion 28 are not limited to those made of different members, and may be made of one member. Further, the second refractory portion 28 is not limited to the one extending from both outer positions with respect to both ends of the first refractory portion 26 in the X direction toward the outer wall 16, and both ends of the first refractory portion 26 in the X direction. It may extend from the side surface on the indoor side in the above toward the outer wall 16. Further, the end portion of the second refractory portion 28 on the outer wall 16 side may be bent along the X direction when viewed from the Z direction.

The number of pillars surrounded by the first refractory portion 26, the second refractory portion 28, and the outer wall 16 is not limited to three, and may be two or four or more.

The plurality of pillars are not limited to those arranged side by side in one direction. The plurality of pillars may be arranged in a substantially L shape when viewed from the Z direction, for example, at least one of the outside corner portion and the inside corner portion of the building 10. Further, the first refractory portion may be formed in a substantially L shape when viewed from the Z direction according to the arrangement of the plurality of pillars.

10 Building 13 Pillar 13B Inner side surface 13C Side surface (Example of the first side surface)
13D side surface (an example of the second side surface)
14 Pillar 14B Inner side surface 14C Side surface (Example of the first side surface)
14D side surface (an example of the first side surface)
15 Pillar 15B Inner side surface 15C Side surface (Example of second side surface)
15D side surface (an example of the first side surface)
16 Outer wall 20 Bearing wall structure (an example of bearing wall structure of a building)
22 Lattice material 26 1st refractory part 26A Upper part 26B Lower part 28 2nd refractory part 32 Light iron base (example of base material)
33 Light iron base (example of base material)
34 Refractory plate (an example of coating material)

Claims (2)

Multiple pillars connected by lattice material on the indoor side of the outer wall of the building,
A first refractory portion that covers the inner side surface of the plurality of pillars on the indoor side and the space portion formed between the plurality of pillars and on which the lattice material is arranged from the indoor side.
A second refractory portion extending from the first refractory portion to the outer wall and covering a second side surface opposite to the first side surface to which the lattice materials of the plurality of pillars are joined.
Have a,
The pillar is provided with a base material for supporting the first refractory portion, and the pillar is provided with a base material.
The first refractory portion is divided into one side and the other side in the direction in which the plurality of pillars are lined up.
A covering material is provided between the first refractory portion and the base material to cover the divided portion of the first refractory portion from the base material side.
Bearing wall structure of the building. The load-bearing wall structure of the building according to claim 1, wherein the first refractory portion is divided into an upper portion and a lower portion below the center of the first refractory portion in the height direction of the building.