JP2023064668A - Joining structure of structural materials - Google Patents

Abstract

To provide a joining structure of structural materials capable of being easily constructed.SOLUTION: A joining structure of structural materials 1 in which a second structural material 20 is vertically attached to the side of a first structural material 10, in which the first structural material 10 and the second structural material 20 include respectively: load support parts 11, 21; covering members 12, 22 covering the side faces along the axial directions Z1, Z2 of the load support parts 11, 21; and burning layers 13, 23 outside the covering members 12, 22. In the junction of the first structural material 10 and the second structural material 20, the side face 11e of the load support part 11 of the first structural material 10 abuts on the end face in the axial direction Z2 of the second structural material 20, and there is a gap 7 between the side face 2e on the second structural material 20 side of the covering member 12 of the first structural material 10 and the end face 2a on the first structural material 10 side of the covering member 22 of the second structural material 20, and a flame-retardant small member 71 is arranged to cover the gap 7.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a structure for joining structural materials.

When wood is heated from the outside during a fire, the surface burns and a carbonized layer is formed. When this carbonized layer is uniformly formed on the surface of the wood, the penetration of heat into the interior of the wood is suppressed, and the structural deterioration of the interior of the wood is suppressed. Utilizing this characteristic, the wood used for columns and beams is made thicker, and a carbonized layer is formed on the surface of the wood after burning so that a sound cross section that can support a long-term load can be secured inside the wood after burning. There is known a technique of providing a flammable margin of a predetermined thickness to form a . A wooden building is also made into a quasi-fire-resistant building by using such a structural material provided with a burning margin for the main structural part.
The structural material provided with the burning margin includes, for example, a structural part with a long rectangular cross section that receives a load, a covering part that covers at least three sides of the cross section of the structural part over the entire length, and a structural part. There is known a wooden building member characterized by comprising an insulating portion interposed in layers between the covering portion and preventing the load acting on the structural portion from being transmitted to the covering portion (Patent Reference 1).

Various techniques have been proposed for joining refractory members with a burning margin on the surface of wood or on the surface of a composite material of wood and other materials. There has been proposed a joining structure of structural materials in which a recess is provided in a column to expose a fire-stopping member that constitutes a fire-stopping layer located in (1), and a beam is brought into contact with the recess to join the column and the beam. Further, Patent Document 3 discloses a joining structure in which a gusset plate of a bracket fixed to the side surface of a column is inserted into a slit extending from the lower surface of the beam to the wooden core of the beam, and a plug member is inserted into the slit. is proposed. Patent Document 4 proposes a joint structure in which a column member and a beam member are joined via a joint member made of a material that is harder than wood and has excellent fire resistance.

JP 2007-46286 A JP 2008-014036 A JP 2014-201984 A Japanese Patent Application Laid-Open No. 2020-118001

In the wooden building member of Patent Document 1, the structural part is covered with the covering part and the insulating part, so when the structural parts of the wooden building members are to be joined together, the covering part and the insulating part get in the way. Sometimes. Therefore, when manufacturing wooden building members in a factory or the like, do not apply coatings or insulation to the joints of the wooden building members. , It is necessary to construct the coating and insulation at the joint. As described above, when the wooden building members of the same document are joined together, the work at the construction site is troublesome.

In the joint structure of Patent Document 2, the flame stop layer of the column and the flame stop layer of the beam are in contact with each other at the joint between the column and the beam. It takes time and effort because it is necessary to control. For example, when joining a column and a beam, for example, when the beam is lowered from above in the axial direction of the column, in order to make the burn-out layer of the column and the burn-out layer of the beam contact, It is necessary to prevent the two from interfering with each other, which is time-consuming.

In Patent Document 3, it takes time and effort to manufacture a plug member that matches the shape of the slit hole formed in the beam. In order not to impair the fireproof performance in the slit holes of the beams, it is necessary to insert the plug members into the slit holes without gaps, but it takes time and effort to insert the plug members into the slit holes without gaps.
In Patent Document 4, it is necessary to use a joint member that is harder than wood and has excellent fire resistance performance, and the joint structure of the document has low versatility.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joining structure of structural materials that can be easily constructed and has excellent fire resistance.

The present invention relates to a joined structure of structural members in which a second structural member is vertically joined to a side surface of a first structural member, wherein the first structural member and the second structural member are respectively a load bearing portion and a load bearing portion. A covering member that covers the side surface along the axial direction of the supporting portion, and a flammable margin layer that is disposed outside the covering member. The axial end surface of the second structural member is in contact with the side surface of the load supporting portion, and the side surface of the covering member of the first structural member on the side of the second structural member and the covering member of the second structural member Disclosed is a joint structure for structural members, which has a gap between it and an end face on the side of a first structural member, and in which a flame-retardant small member is arranged so as to cover the gap.

The present invention also provides a joined structure of structural members in which a second structural member is vertically joined to a side surface of a first structural member, wherein the first structural member and the second structural member each comprise a load supporting portion and a load bearing portion. A covering member that covers the side surface along the axial direction of the load supporting part, and a flammable margin layer disposed on the outer side of the covering member. The axial end surface of the second structural member is in contact with the side surface of the load supporting portion, and the side surface of the covering member of the first structural member on the side of the second structural member and the covering member of the second structural member There is provided a joining structure of structural materials, in which a gap is provided between the first structural member side end face of and a thermal expansion insulating material is arranged in the gap.

ADVANTAGE OF THE INVENTION According to this invention, while being able to construct simply, the joining structure of the structural material which is excellent in fireproof performance can be provided.

FIG. 1(a) is a cross-sectional view schematically showing a joint structure of structural members according to a preferred embodiment of the present invention, and FIG. 1(b) is an enlarged view of a main portion of FIG. 1(a). FIG. 2 is a sectional view taken along the line II-II of FIG. 1(a). FIG. 3(a) is a cross-sectional view schematically showing a joining structure of structural members according to another preferred embodiment of the present invention, and FIG. 3(b) is an enlarged view of a main portion of FIG. 3(a). . FIG. 4 is a sectional view taken along line IV-IV of FIG. 3(a). 5(a) to 5(e) are enlarged cross-sectional views of essential parts showing modifications of the arrangement position of the thermal expansion insulating material according to the joint structure of the embodiment shown in FIG. 3(a).

Hereinafter, the present invention will be described in detail based on its preferred embodiments.
1 and 2 show a joint structure 1, which is a preferred embodiment of the joint structure of structural materials of the present invention. The joint structure 1 is a structural member joint structure in which the second structural member 20 is vertically joined to the side surface of the first structural member 10 .

The first structural member 10 is, for example, a structural square member used as a pillar of a building. The first structural member 10 includes a load supporting portion 11 , a covering member 12 that covers the side surface of the load supporting portion 11 along the axial direction Z<b>1 , and a burnt margin layer 13 that is provided outside the covering member 12 .
The load-bearing portion 11 is designed in cross-section so that the load-bearing portion 11 alone is safe in terms of structural strength against long-term loads (long-term loads) such as fixed loads, load loads, and snow loads. Such cross-sectional designs are known. The cross-sectional shape of the load-bearing part 11 is rectangular, and the longitudinal and lateral lengths of the load-bearing part 11 in the cross-section of the first structural member 10 correspond to the shape of a beam or column, or the shape of a large pillar. It can be changed as appropriate depending on, for example.

The covering member 12 covers four side surfaces of the load supporting portion 11 along the axial direction Z1. The covering member 12 consists of a first covering member 12a covering both sides of the load supporting portion 11 in the one direction X1 of the cross section of the first structural member 10, and a load supporting portion in the orthogonal direction Y1 orthogonal to the one direction X1. and a second covering member 12b covering both sides of .
Both ends of the first covering member 12a in the Y direction coincide with both ends of the load supporting portion 11 in the Y direction, and cover the load supporting portion 11 over the entire Y direction. The first covering member 12a can be fixed to the side surface of the load bearing portion 11 by known fixing means such as screws, nails, staples or adhesives. In this embodiment, the first covering member 12a is composed of a laminate obtained by stacking two plate-like members. Each plate-shaped member that constitutes the laminate may be configured by connecting a plurality of members with a fastening material. Adhesives, screws, nails, staples, and the like, for example, can be used as fastening materials. Also, the first covering member 12a may be a laminate in which three or more plate-like members are laminated. In the laminate, the plate-like members constituting the laminate may or may not be joined in advance with an adhesive or the like. The laminate may be fixed to a member to be fixed, such as the load support portion 11, with or without adhesion between the plate-like members constituting the laminate. The same applies when the second covering member 12b and the corner reinforcing member 15, which will be described later, are made of a laminate. The first covering member 12a may be a single plate member.

In this embodiment, a corner reinforcing member 15 is arranged on the outer surface of the first covering member 12a. More specifically, the corner reinforcing member 15 is arranged so as to partially overlap the outer surface of the first covering member 12a and partially extend from one end of the load supporting portion 11 in the Y direction. (See FIG. 1(a)). Here, the overlapping state means a state in which the corner reinforcing member 15 and the first covering member 12a have overlapping portions, and the corner reinforcing member 15 and the first covering member 12a are in contact with each other. It includes not only the state in which the corner reinforcing member 15 and the first covering member 12a are separated from each other. In this embodiment, the corner reinforcing member 15 and the first covering member 12a are in contact with each other. Further, in this embodiment, the corner reinforcing member 15 also extends from one end of the first covering member 12a.

The corner reinforcing member 15 can be fixed to the outer surface of the first covering member 12a by known fixing means such as screws, nails, staples or adhesives. In the present embodiment, the corner reinforcing member 15 is made of a laminated body in which two plate-shaped members are superimposed. Each plate-shaped member that constitutes the laminate may be configured by connecting a plurality of members with a fastening material. Also, the corner reinforcing member 15 may be a laminate in which three or more plate-like members are laminated. It should be noted that the plate-like members constituting the corner reinforcing member 15 do not necessarily have to be joined together by a fastening material, and the ends of the plate-like members may be butted against each other. The corner reinforcing member 15 may be a single plate member.

The second covering member 12b extends from both ends of the load supporting portion 11 in the X1 direction, and the tip surface in the extending direction faces the portion of the corner reinforcing member 15 extending from one end of the load supporting portion 11. there is The second covering member 12b can be fixed to the side surface of the load bearing portion 11 by known fixing means such as screws, nails, staples or adhesives. Further, in the present embodiment, the second covering member 12b is composed of a laminated body in which two plate-like members are superimposed. Also, the second covering member 12b may be a laminate in which three or more plate-like members are laminated. The second covering member 12b may be a single plate member.

The embers layer 13 consists of a first embers layer 13a arranged outside each of the first covering members 12a in the X1 direction, and a second embersing margin layer 13b arranged outside each of the second covering members 12b in the Y1 direction. including. The first embers layer 13a is fixed to the outside of the first covering member 12a via a spacer 17 so as to have a ventilation layer 6 between itself and the first covering member 12a. As shown in FIG. 1(a), the ventilation layer 6 preferably extends between the corner reinforcing member 15 and the embers layer 13a. 13b is also present. By providing the ventilation layer 6 between the flammable layer 13 and the load bearing portion 21, the load bearing portion 21 can be easily kept dry. For example, even if the load supporting portion 21, the first covering member 12a, the second covering member 12b, and the corner reinforcing member 15 get wet due to rain or the like, the moisture evaporated from the load supporting portion 21 will pass through the ventilation layer 6. Easy to diffuse in the air.

The thickness T of the embers layer 13 can be set based on a known embers design. The burn margin design is a design method that adds a predetermined burn margin to the cross section required for long-term structural strength and short-term structural strength in the event of an earthquake. It is designed to ensure the load bearing part 11 that does not collapse while withstanding the load that supports the building, and to provide a flammable margin layer with a thickness corresponding to the required fire resistance performance around it. For example, for one-hour quasi-fire resistance, a flammable margin design with a 45 mm wood covering is performed.

Since the general carbonization rate of wood is about 0.6 mm/min, the thickness T of the charred margin layer 13 is preferably 36 mm or more, or more, from the viewpoint of imparting fire resistance performance to the charred margin layer 13 for one hour. It is preferably 45 mm or more. The thickness T of the burning margin layer 13 is preferably 72 mm or more, more preferably 90 mm or more, from the viewpoint of imparting fire resistance performance to the burning margin layer 13 for 2 hours. The thickness T of the burning margin layer 13 is preferably 108 mm or more, more preferably 120 mm or more, from the viewpoint of imparting fire resistance performance for 3 hours to the burning margin layer 13 .

In this embodiment, the spacers 17 are arranged intermittently or continuously in one or both of the axial direction Z1 of the load supporting portion 11 and the direction Z2 orthogonal to the axial direction Z1. In the embodiment shown in FIG. 1, the spacers 17 are arranged intermittently or continuously in the axial direction Z1.
Further, in this embodiment, the spacer 17 is fixed to the load bearing portion 11 and the first covering member 12a by screws (not shown), and the first embers layer 13a is fixed to the spacer by screws or nails (not shown). 17 is fixed. From the viewpoint of preventing the screw or nail from forming a thermal bridge, it is preferable that the tip of the screw or nail (not shown) that fixes the first margin layer 13a does not reach the load supporting portion 11 . Further, in this embodiment, it is preferable that the first erosion layer 13a is recessed so that the screws do not protrude from the outer surface of the first erosion layer 13a.

In this embodiment, the second structural member 20 is joined to the side surface of the first structural member 10 as described above. The second structural member 20 is, for example, a structural square member used as a beam of a wooden building.
More specifically, the second structural member 20 includes the load supporting portion 21, the covering member 22 covering the side surface of the load supporting portion 21 along the axial direction Z2, and the outer side of the covering member 22. A flammable margin layer 23 is provided.
Like the load-bearing part 11 of the first structural member 10, the load-bearing part 21 of the second structural member 20 alone is capable of supporting a fixed load, a loaded load, and a load that occurs over a long period of time (long-term load). Its cross section is designed to be structurally safe against

The covering member 22 of the second structural member 20 covers three side surfaces of the load supporting portion 21 along the axial direction Z2. The covering member 22 consists of a first covering member 22a covering both sides of the load supporting portion 21 in the one direction X2 of the cross section of the second structural member 20, and a load supporting portion in the orthogonal direction Y2 orthogonal to the one direction X2. 21 and a second covering member 22b covering one side of the second covering member 22b. In the present embodiment, the positions of the ends of the first covering member 22a and the second covering member 22b in the axial direction Z2 do not coincide with the positions of the ends of the load supporting portion 21 . Specifically, the ends of the first covering member 22 a and the second covering member 22 b do not reach the ends of the load supporting portion 21 . In other words, the positions of the ends of the first covering member 22a and the second covering member 22b are located inward in the axial direction Z2 from the positions of the ends of the load supporting portion 21 . Note that the positions of the ends of the first covering member 22a and the second covering member 22b may coincide with the positions of the ends of the load supporting portion 21, and the first covering member 22a and the second covering member 22b may may cover the load supporting portion 21 over the entire area in the axial direction Z2.

The first covering member 22a and the second covering member 22b can be fixed to the side surfaces of the load bearing portion 21 by known fixing means such as screws, nails, staples or adhesives. In the present embodiment, the first covering member 22a and the second covering member 22b are composed of a laminated body in which two plate-shaped members are superimposed. Each plate-shaped member that constitutes the laminate may be configured by connecting a plurality of members with a fastening material. Also, the first covering member 22a and the second covering member 22b may be a laminated body in which three or more plate members are laminated. In the laminate, the plate-like members constituting the laminate may or may not be joined in advance with an adhesive or the like. Note that the first covering member 22a and the second covering member 22b may be a single plate-like member having fire resistance.

The embers layer 23 consists of a first embers layer 23a arranged outside each of the first covering members 22a in the X2 direction, and a second embersation layer 23b arranged outside the second covering members 22b in the Y2 direction. including. The first embers layer 23a is fixed to the outside of the first covering member 22a via a spacer 27 so as to have the ventilation layer 6 between itself and the first covering member 22a. The thickness T of the embers layer 23 can be set based on a known embers design, similarly to the embers layer 13 of the first structural member 10 .

The spacers 27 are arranged intermittently or continuously in one or both of the axial direction Z2 of the load supporting portion 21 and the direction Z1 orthogonal to the axial direction Z2. In the embodiment shown in FIG. 1, the spacers 27 are arranged intermittently or continuously in the Z1 direction.
In this embodiment, the method for fixing the spacer 27 of the second structural member 20 to the load supporting portion 21 and the first covering member 22a is to fix the spacer 17 of the first structural member 10 to the load supporting portion 11 and the first covering member 12a It may be the same as the fixing method. The method of fixing the first embers layer 23 a of the second structural member 20 to the spacers 27 may be the same as the method of fixing the first embers layer 13 a of the first structural member 10 to the spacers 17 .

In the present embodiment, in the axial direction Z2 of the second structural member 20, the load bearing portion 21 and the covering member 22 extend from the burnout layer 23, and the load bearing portion 21 extends from the covering member 22. . The end surface of the second structural member 20 in the axial direction Z2 is the end surface 21a of the load supporting portion 21 of the second structural member 20. As shown in FIG.

As shown in FIGS. 1 and 2, in the joint structure 1 of the present embodiment, at the joint between the first structural member 10 and the second structural member 20, the side surface 11e of the load supporting portion 11 of the first structural member 10 has The end surface of the second structural member 20 in the axial direction Z2 is in contact. In the present embodiment, the load-bearing portion 11 of the first structural member 10 has a part thereof which is not covered with the covering member 12 and the burnt margin layer 13, and the load-bearing portion 11 at the portion is provided. The end surface 21a of the load supporting portion 21 of the second structural member 20 is in contact with the side surface 11e.
In this embodiment, the first structural member 10 is formed with a recess 19 that exposes the side surface 11 e of the load supporting portion 11 , and the end surface 21 a of the load supporting portion 21 of the second structural member 20 is formed in the recess 19 . , is fixed to the side surface 11 e of the load supporting portion 11 . The concave portion 19 can be formed by partially cutting out the embers layer 13 and the covering member 12 of the first structural member 10 so as to penetrate the embers layer 13 and the covering member 12 . The load supporting portion 11 of the first structural member 10 and the load supporting portion 21 of the second structural member 20 can be fixed by a known method.

In addition, in the joint structure 1, at the joint portion between the first structural member 10 and the second structural member 20, the side surface 2e of the covering member 12 of the first structural member 10 on the side of the second structural member 20 and the second structural member 20 A gap 7 is provided between the covering member 22 and the end face 2a on the first structural member 10 side. In other words, at the joint between the first structural member 10 and the second structural member 20, the side surface 11e of the covering member 12 of the first structural member 10 and the covering member 22 of the second structural member 20 are not in contact. , are separated from each other. In this embodiment, the gap 7 is formed along three side surfaces of the second structural member 20 covered with the covering members 22a and 22b. The gap 7 may be formed along one or more of the three sides of the second structural member 20 covered with the covering members 22a and 22b. The gap 7 may be continuous in the circumferential direction of the second structural member 20, or may be divided into a plurality of pieces in the circumferential direction.

In the joint structure 1 of the present embodiment, at the joint between the first structural member 10 and the second structural member 20, the side surface 11e of the load supporting portion 11 of the first structural member 10 is provided in the axial direction Z2 of the second structural member 20. The advantages of having the end faces in contact and having the gap 7 are as follows.
For example, in order to bring the covering members 12 and 22 of the first structural member 10 and the second structural member 20 into contact with each other without a gap, it is necessary to It is necessary to join the first structural member 10 and the second structural member 20 while maintaining them. Moreover, in order for both the covering members 12 and 22 to abut without gaps, it is also necessary to manufacture the first structural member 10 and the second structural member 20 precisely according to design dimensions. As described above, it takes time and effort to construct a joint structure in which the covering members 12 and 22 of the first structural member 10 and the second structural member 20 are in contact with each other at the joint.

On the other hand, in the joint structure 1 of the present embodiment, the side surface 2e of the covering member 12 of the first structural member 10 and the covering of the second structural member 20 are formed at the joint between the first structural member 10 and the second structural member 20. Since the gap 7 is provided between the end surface 2a of the member 22 and the covering members 12 and 22, there is no need to perform work to maintain the contact state. In addition, for example, even if the length of the covering member 22 of the second structural member 20 in the axial direction Z2 is shorter than the design dimension, it is possible to join without performing work for compensating for the length of the covering member 22. Structure 1 can be constructed.
Thus, the joint structure 1 of this embodiment can be constructed easily.

In addition, at the joint between the first structural member 10 and the second structural member 20, the end surface of the second structural member 20 in the axial direction Z2 is in contact with the side surface 11e of the load supporting portion 11 of the first structural member 10. As a result, the side surface 11e of the load supporting portion 11 of the first structural member 10 and the end surface 21a of the load supporting portion 21 of the second structural member 20 can be prevented from being directly exposed to flames. It is also possible to prevent the support part 11 and the load support part 21 of the second structural member 20 from burning, so that the fire resistance performance of the joint structure 1 can be improved.

In this embodiment, as shown in FIGS. 1 and 2, a flame-retardant small member 71 is arranged so as to cover the gap 7 . More specifically, the small member 71 closes the opening of the second structural member 20 in the gap 7 located on the side opposite to the load supporting portion 21 . Further, in this embodiment, in the same way that the gap 7 is provided on both sides of the load supporting portion 21 of the second structural member 20 in the X2 direction, on one side of the load supporting portion 21 of the second structural member 20 in the Y2 direction, There is also a gap 7 between the covering member 12 of the first structural member 10 and the covering member 22 of the second structural member 20, and the gap 7 and the small member 71 covering the gap 7 are the second structural member 20. It exists so as to surround three sides of the load support portion 21 in the circumferential direction. Flame-retardant means having fire-resistant performance equal to or greater than flame-retardant performance. When the surface is irradiated with radiant heat of 50 kW/ ^m2 , the total calorific value for 5 minutes after the start of heating is 8 MJ/ ^m2 or less, and cracks penetrating to the back surface harmful to fire prevention within 5 minutes after the start of heating, and It means that there are no holes, and that the heat generation rate for 5 minutes after the start of heating does not exceed 200 kW/m ² continuously for 10 seconds or more.
By arranging the small member 71 so as to cover the gap 7, it is possible to prevent flames from entering through the gap 7, so that the joint structure 1 is excellent in fire resistance.
As described above, the joint structure 1 of the present embodiment can be easily constructed and has excellent fire resistance.

The small member 71 is a member with a small cross section. Here, the small cross section means that the width of the small member 71 along the axial direction Z2 of the second structural member 20 is 10 cm or less.
The small member 71 is a separate member from the covering member 22 of the second structural member 20 . Here, being a separate member means that the small member 71 and the covering member 22 are separate members. The material of the small member 71 and the covering member 22 may be the same or different. In this embodiment, the small member 71 is also a separate member from the covering member 12 of the first structural member 10 .
Examples of the flame-retardant small member 71 include gypsum board, water-resistant gypsum board, calcium silicate board, wood chip cement board, wood wool cement board, ceramic siding, flame-retardant wood, non-combustible wood, glass wool, rock wool, and heat. Expansive heat insulating material, mortar, concrete block, ALC plate, metal plate, aluminum tape, etc. can be used. The board material (plate-like material) or the like is preferably formed or cut so that the width along the axial direction Z2 of the second structural member 20 is 10 cm or less.

From the viewpoint of further improving the fire resistance of the joint structure 1, at the joint between the first structural member 10 and the second structural member 20, the side surface 2e of the covering member 12 of the first structural member 10 and the covering of the second structural member 20 The distance D between the end face 2a of the member 22 is preferably 3 cm or less, more preferably 2 cm or less, still more preferably 1 cm or less (see FIG. 1(b)). From the viewpoint of facilitating construction of the joint structure 1, the distance D is preferably greater than 0 cm, more preferably 1 cm or more, and even more preferably 2 cm or more (see FIG. 1(b)).

Next, an example of the construction method of the joining structure 1 of this embodiment will be described.
First, the first structural member 10 is erected with the axial direction Z1 aligned with the vertical direction. The first structural member 10 is prepared in a factory or the like in advance by providing a portion of the load supporting portion 11 that is not covered with the covering member 12 and the burnt margin layer 13 and that exposes the side surface 11e of the load supporting portion 11. It is preferable to keep Then, the second structural member 20 lifted by a lifting machine or the like is lowered from above the first structural member 10 in the axial direction Z1 to the exposed portion of the load supporting portion 11 of the first structural member 10 . Then, the end surface 21 a of the load supporting portion 21 of the second structural member 20 is fixed to the side surface 11 e of the load supporting portion 11 of the first structural member 10 . At this time, a gap 7 is formed between the covering member 12 of the first structural member 10 and the covering member 22 of the second structural member 20 at the joint between the first structural member 10 and the second structural member 20. to After fixing the load-bearing portion 21 of the second structural member 20 to the load-bearing portion 11 of the first structural member 10 , the covering member 12 of the first structural member 10 and the covering member of the second structural member 20 are separated by the small members 71 . cover the gap 7 between 22. Thus, the joint structure 1 can be constructed. The small member 71 can be fixed to the covering member 12 of the first structural member 10 or the covering member 22 of the second structural member 20 by any method.

Further, according to the joint structure 1 of the present embodiment, after the pair of first structural members 10 are erected at regular intervals, when the second structural member 20 as a beam member is arranged between them, Since the second structural member 20 can be lowered so that the gap 7 is formed between the covering member 12 of the first structural member 10 and the covering member 22 of the second structural member 20, the second structural member 20 During descent, the contact between the covering member 12 of the first structural member 10 and the covering member 22 of the second structural member 20 is suppressed, so that the second structural member 20 can be arranged at an appropriate position and the second structural member 20 can 1 Fixing to the structural member 10 is easy.

Another embodiment of the present invention will now be described with reference to FIGS. 3 and 4. FIG. The description of the embodiment shown in FIGS. 1 and 2 applies appropriately to configurations not particularly described in the embodiment shown in FIGS.

In the joint structure 1B shown in FIGS. 3 and 4, similarly to the joint structure 1 shown in FIGS. Although a gap 7 is formed between 12 and the covering member 22 of the second structural member 20, the small member 71 is not arranged in the joint structure 1B.
In the joint structure 1B, as shown in FIGS. 3 and 4, a thermal expansion insulating material 72 is arranged in the gap 7. As shown in FIGS. The thermal expansion type heat insulating material 72 fills all or part of the gap 7 when heat is applied to the thermal expansion type heat insulating material 72 in the event of a fire or the like, thereby exhibiting a heat shielding effect and shielding heat from the outside. It suppresses the load support part from being exposed to the heat of the heat and igniting.
In the state before expansion, the thermal expansion type heat insulating material 72 may be arranged so as to completely fill the gap 7, or as shown in FIG. It may be arranged so as to remain. At least a portion of the thermal expansion insulating material 72 preferably exists within the gap 7 . The entire thermal expansion type heat insulating material 72 may be arranged outside the gap 7 and in the vicinity of the gap 7 . The vicinity of the gap 7 here is arranged near the gap 7 so that a part of the thermal expansion insulating material 72 fills a part or the whole of the gap 7 when it expands with heat. means that there is
In this embodiment, the thermal expansion type heat insulating material 72 is fixed to the end surface 2a of the covering member 22 of the second structural member 20 so as not to reach the side surface 2e of the covering member 12 of the first structural member 10. The expansion system heat insulating material 72 thermally expands to reach the side surface 2e.
In this way, the joint structure 1B also has the gap 7, and the inflow of heat through the gap 7 is blocked by the thermally expanded thermally expandable heat insulating material 72 in the event of a fire. Similarly, it can be constructed easily and has excellent fire resistance.

As the thermally expandable heat insulating material 72, foamable fireproof tape, foamable fireproof sheet, foamable caulking material, foamable fireproof paint, or the like can be used. Among these, it is preferable to use the expandable fireproof tape from the viewpoint that it can be easily applied in a short time.
The expandable fireproof tape and the expandable fireproof sheet each form a heat insulating layer by foaming when subjected to heat. The expandable fireproof tape and the expandable fireproof sheet each contain resin as a main constituent material. Examples of the resin that is the main constituent material of each of the expandable fireproof tape and the expandable fireproof sheet include butyl rubber, epoxy resin, vinyl chloride resin, and the like. The foamable fireproof sheet can be fixed to the end surface 2a of the covering member 22 and the side surface 2e of the covering member 12 using an adhesive, staples, or the like, for example.
Since the foaming caulking material and the foaming fire-resistant paint can be applied by applying or spraying to the place to be applied, it is difficult to apply the foaming fire-resistant tape or the foaming fire-resistant sheet to the place to be applied. However, it can be easily constructed. Examples of resins that are main constituent materials of the foaming caulking material and foaming fire-resistant paint include silicone resins, acrylic resins, vinyl acetate resins, epoxy resins, urethane resins, and the like.
The thermal expansion heat insulating material 72 is generally an organic heat insulating material. An organic heat insulating material is a heat insulating material whose main component is an organic compound.

In the joint structure 1B, as shown in FIGS. 5(a) to 5(e), the thermal expansion insulating material 72 may be fixed to the side surface 2e of the covering member 12 of the first structural member 10. FIG. Modifications of the arrangement of the thermal expansion type heat insulating material 72 will be described below with reference to FIGS. 5(a) to 5(e).
In the example shown in FIG. 5A, the thermal expansion type heat insulating material 72 is arranged from the bottom surface 7b of the gap 7 to the opening 7a. More specifically, one end 72b of the thermal expansion heat insulating material 72 in the X1 direction is in contact with the bottom surface 7b of the gap 7, and the other end 72a of the thermal expansion heat insulating material 72 in the X1 direction is in contact with the bottom surface 7b of the gap 7. coincides with the opening surface of the opening 7a of the gap 7. As shown in FIG. The bottom surface 7 b of the gap 7 is formed by the side surface of the load supporting portion 21 of the second structural member 20 .
In the example shown in FIG. 5( b ), the thermal expansion type heat insulating material 72 extends beyond the opening 7 a of the gap 7 . More specifically, the other end 72a of the thermal expansion insulating material 72 is located on the side opposite to the bottom surface 7b with respect to the opening 7a of the gap 7. As shown in FIG.
In the example shown in FIG. 5( c ), the thermal expansion type heat insulating material 72 does not reach the opening 7 a of the gap 7 . More specifically, the other end 72a of the thermal expansion insulating material 72 is located closer to the bottom surface 7b than the opening 7a of the gap 7 is.
In the example shown in FIG. 5( d ), the thermal expansion type heat insulating material 72 does not reach the bottom surface 7 b of the gap 7 . More specifically, one end 72b of the thermal expansion insulating material 72 is not in contact with the bottom surface 7b of the gap 7, and the two are separated from each other.
In the example shown in FIG. 5( e ), the thermal expansion type heat insulating material 72 is arranged outside the gap 7 .

5(a) to 5(e), since the gap 7 is filled with the thermal expansion insulating material 72 that thermally expands in the event of a fire, the heat is transferred through the gap 7. It is excellent in fire resistance because it can block inflow. 5(a) to 5(e) also have a gap 7, so they can be easily constructed.

Next, matters common to each of the above-described embodiments will be described.
The embers layer 13, 23 is selected from the group consisting of cross-laminated timber (CLT), laminated lumber, laminated veneer lumber (LVL), plywood, lumber, particle board (PB), and medium density fiberboard (MDF). It can be formed from selected materials. Among them, cross-laminated timber (CLT) is used because it is easy to manufacture wide and long-span materials, and it is easy to ensure the aesthetic appearance of large-scale wooden buildings. ), laminated wood, laminated veneer lumber (LVL), plywood or lumber. The CLT or laminated wood may be a plurality of laminae having rectangular cross sections laminated in the Y1 direction or the Y2 direction such that the vertexes of the rectangles overlap each other.

As the first covering members 12a and 22a, gypsum board, waterproof gypsum board, calcium silicate board, ALC board, wood chip cement board, wood wool cement board, ceramic siding, mortar, flame-retardant wood, etc. can be used. From the viewpoint of fire resistance, it is preferable to use gypsum board, waterproof gypsum board, and calcium silicate board.

As the spacers 17 and 27, lumber, steel lumber, stainless steel lumber, etc. can be used, and from the viewpoint of resistance to deformation due to heat, it is preferable to use lumber.

As the corner reinforcing member 15, gypsum board, waterproof gypsum board, calcium silicate board, ALC board, wood piece cement board, wood wool cement board, ceramic siding, mortar, flame-retardant wood, etc. can be used. From this point of view, it is preferable to use a gypsum board, a waterproof gypsum board, or a calcium silicate board. The material forming the corner reinforcing member 15 and the material forming the covering members 12 and 22 may be the same or different.

As the second covering members 12b and 22b, a calcium silicate board, gypsum board, waterproof gypsum board, ALC board, wood piece cement board, wood wool cement board, ceramic siding, mortar, flame-retardant wood, etc. can be used. From the viewpoint of suppressing heat shrinkage, it is preferable to use a calcium silicate board.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above-described embodiments.
For example, in each embodiment described above, the first embers layer 13a, 23a was fixed to the first covering member 12a, 22a via the spacers 17, 27, but the first embers layer 13a, 23a It may be fixed to the first covering members 12a, 22a without the spacers 17, 27 interposed therebetween. Further, the second embers layer 13b, 23b may be fixed via spacers 17, 27 so as to have a gap between them and the second covering members 12b, 22b.

In each of the above-described embodiments, the second structural member 20 is joined to one side of the first structural member 10 in the Y1 direction. It may be joined on both sides. Also, the second structural member 20 may be joined to one side or both sides of the first structural member 10 in the X1 direction.

Reference Signs List 1, 1B Joining structure 10 First structural member 11 Load supporting part 12 Covering member 13 Burning margin layer 20 Second structural member 21 Load supporting part 22 Covering member 23 Burning margin layer 7 Gap 71 Small member 72 Thermal expansion type heat insulating material

Claims (4)

A joint structure of structural members in which a second structural member is vertically joined to a side surface of a first structural member,
The first structural member and the second structural member each include a load bearing portion, a covering member covering the side surface of the load bearing portion along the axial direction, and a embers layer disposed outside the covering member,
At the joint between the first structural member and the second structural member, the axial end surface of the second structural member is in contact with the side surface of the load-bearing portion of the first structural member, and the coating of the first structural member A gap is provided between a side surface of the member on the side of the second structural member and an end surface of the covering member of the second structural member on the side of the first structural member,
A joining structure of structural materials, wherein a flame-retardant small member is arranged so as to cover the gap. A joint structure of structural members in which a second structural member is vertically joined to a side surface of a first structural member,
The first structural member and the second structural member each include a load bearing portion, a covering member covering the side surface of the load bearing portion along the axial direction, and a embers layer disposed outside the covering member,
At the joint between the first structural member and the second structural member, the axial end surface of the second structural member is in contact with the side surface of the load-bearing portion of the first structural member, and the coating of the first structural member A gap is provided between a side surface of the member on the side of the second structural member and an end surface of the covering member of the second structural member on the side of the first structural member,
2. The joining structure of structural materials according to claim 1, wherein a thermal expansion insulating material is disposed in said gap or in the vicinity of said gap. 3. The joining structure of structural materials according to claim 2, wherein said thermal expansion type heat insulating material is an organic type heat insulating material. 4. The joining structure of structural materials according to claim 2 or 3, wherein the thermally expandable heat insulating material is an expandable fireproof tape, an expandable fireproof sheet, an expandable caulking material, or an expandable fireproof paint.

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