Ceiling structure and anti-tip hardware

Abstract

To provide a ceiling structure where horizontal braces are fixed at different heights within the same ceiling.SOLUTION: A ceiling structure is characterized in that: one end 31 of a second beam 3 is connected to one side part 21 of a first beam 2; an end part 51 of a first brace 5 installed in a horizontal direction in a first zone 20 is fixed on the other side part 22 of the first beam 2 to which the second beam 3 is connected; an end part 61 of a second brace 6 installed in a horizontal direction in a second zone 30 at a height different from a height at which the first brace 5 is installed is fixed on the one side part 21 of the first beam 2 to which the second beam 3 is connected; and a cleat 7 having rigidity against a direction parallel to an internal surface direction of a surface formed with a longitudinal direction and a vertical direction of the second beam 3 connected to the one side part 21 of the first beam 2 is fixed on the one side part 21 of the first beam 2, to which the one end 31 of the second beam 3 is fixed, and the one end 31 of the second beam 3 connected to the one side part 21 of the first beam 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a ceiling structure that enables mounting, within a ceiling supported by a beam of a building, a horizontal brace extending horizontally and a horizontal brace extending horizontally at a height different from that of the horizontal brace, and to an anti-tip hardware for preventing the beam from twisting or breaking when a force attempting to rotate about the longitudinal direction of the beam is applied to the beam.

Background Art

[0002] Conventionally, there has been a construction method of reinforcing the structure formed by a beam by fixing an end portion of a brace to the beam supporting the ceiling of a building and attaching a brace extending horizontally within the ceiling. At this time, a tensile force that pulls the beam with both ends thereof fixed is applied to the brace. Therefore, as described in Patent Document 1, a method of reinforcing the structure formed by a structural frame, which is two beams or columns, by fixing a joining hardware to the structural frame is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in recent years, buildings have various structures, and due to the arrangement of pipes such as electricity, gas, or water supply, and equipment such as heat insulation materials, sound insulation materials, or heating inside the ceiling, the space inside the ceiling may be restricted. In this case, even if it is desired to install a plurality of horizontal braces on the same plane inside the ceiling to reinforce the structure formed by the beam, there may not be enough space to install the plurality of horizontal braces on the same plane inside the ceiling. Therefore, it is conceivable to install a plurality of braces at different heights instead of on the same plane inside the ceiling. In this case, however, since the beam is pulled in the horizontal direction at different heights by each brace, a force that causes the beam to rotate about the longitudinal direction of the beam as the central axis is applied to the beam. Therefore, the beam to which the ends of the braces at different heights are fixed will twist or break, and there is a risk that the building will become vulnerable.

[0005] Therefore, it is conceivable to reinforce the beam using reinforcing hardware. However, the joining hardware described in Patent Document 1 reinforces the two structural bodies to which the joining hardware is attached in the direction in which they are pulled by the brace, and cannot reinforce against the force that attempts to rotate about the longitudinal direction of the beam as the central axis.

[0006] Alternatively, it is conceivable to reinforce the structure formed by the beam that supports the ceiling without using braces by increasing the number of beams or using beams with greater strength. However, when increasing the number of beams, the material cost, construction time, and labor will increase significantly. When using beams with greater strength, not only will the material cost increase, but the space limitation will increase due to the volume of the beam itself.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a ceiling structure in which a horizontal brace extending horizontally and a horizontal brace extending horizontally at a different height from the horizontal brace can be installed inside the ceiling. Another object is to provide an anti-tip hardware that can prevent the beam from twisting or breaking when a force that attempts to rotate about the longitudinal direction of the beam as the central axis is applied to the beam.

Means for Solving the Problem

[0008] In a building where a ceiling on the same floor is supported by a first section assembled in a grid pattern by a plurality of first beams and a second section adjacent to the first section and assembled in a grid pattern by a plurality of second beams, at the boundary between the first section and the second section, one end of the second beam is joined to one side portion of the first beam, and at the other side portion of the first beam to which the second beam is joined, one end of a first brace horizontally spanning within the first section is fixed. At one side portion of the first beam to which the second beam is joined, one end of a second brace horizontally spanning within the second section is fixed at a height different from the height at which the first brace is spanned. It has a vertical fixing hole, a horizontal plate-shaped first fixing part that overlaps the horizontal surface of the first beam and is fixed to the first beam, a plate-shaped connecting part that bends from one end of the first fixing part and extends vertically, bends from one end of the connecting part so as to be Z-shaped and extends horizontally, has a vertical fixing hole, and a second fixing part that overlaps the horizontal surface of the second beam and is fixed to the second beam, and is an L-shaped plate that extends at a right angle to the surfaces of the first fixing part, the second fixing part, and the connecting part. One end of the second beam joined to one side portion of the first beam and the one side portion of the first beam to which the one end of the second beam joined are fixed to each other by a tipping prevention hardware having rigidity in a direction parallel to the in-plane direction of the plane formed by the longitudinal direction of the second beam joined to one side portion of the first beam and the vertical direction.

[0009] Furthermore, the vertical length of the second beam is shorter than the vertical length of the first beam, and the second beam and the first beam are arranged such that the upper surface of the second beam and the upper surface of the first beam are at the same height.

[0010] Furthermore, a ceiling board fixed below the second beam is fixed higher by the difference in the vertical lengths of the first beam and the second beam than a ceiling board fixed below the first beam.

[0011] Also, the vertical length of the second beam is shorter than the vertical length of the first beam, and the second beam and the first beam are arranged such that the lower surface of the second beam and the lower surface of the first beam are at the same height.

[0012] Furthermore, the floor board material fixed above the second beam is fixed lower by the difference in the vertical lengths of the first beam and the second beam than the floor board material fixed above the first beam.

[0013] The anti-tilting hardware according to the present invention is an anti-tilting hardware for fixing the first beam and the second beam to each other in a structure in which one end of the second beam is joined to one side portion of the first beam. It has fixing holes in the vertical direction, overlaps the horizontal surface of the first beam, and is fixed to the first beam Horizontal plate-shaped a first fixing portion, a plate-shaped connecting part that bends from one end of the first fixing part and extends vertically, and bends from one end of the connecting part so as to be Z-shaped and extends horizontally a second fixing portion having fixing holes in the vertical direction, overlapping the horizontal surface of the second beam, and being fixed to the second beam, and the first fixing portion and the second fixing portion and is an L-shaped plate that extends at a right angle to the surface of the connecting part and a supplementary rigid portion having rigidity in a direction parallel to the in-plane direction of the plane formed by the longitudinal direction of the second beam and the vertical direction.

Advantages of the Invention

[0014] According to the ceiling structure of the present invention, it becomes possible to install a first brace spanning horizontally inside the ceiling and a second brace spanning horizontally at a height different from that of the first brace.

[0015] Furthermore, a space can be formed below the second beam, and various usage methods can be adopted, such as installing piping for electricity, gas, or water, and equipment such as heat insulation materials, sound insulation materials, or heating, by utilizing the formed space. In particular, a space that can be effectively used for the indoor space located below the ceiling can be formed.

[0016] Furthermore, the ceiling height of the indoor space located below the ceiling supported by the second beam can be increased, and a sense of openness of the indoor space can be created.

[0017] Furthermore, a space can be formed above the second beam, and various utilization methods can be adopted, such as installing pipes for electricity, gas, or water supply, and equipment such as heat insulation materials, sound insulation materials, or heating in the formed space. In particular, a space that can be effectively used for the indoor space located above the ceiling can be formed.

[0018] Furthermore, the floor level of the indoor space located above the ceiling supported by the second beam can be lowered by one level from the floor level of the indoor space located above the ceiling supported by the first beam, thereby creating a sense of openness in the indoor space.

[0019] According to the anti - tipping hardware according to the present invention, when a force tending to rotate about the longitudinal direction of the beam is applied to the first beam, the reinforcing portion acts as a stiffener against the force, thus preventing the torsion and breakage of the first beam.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0021] The structure of the ceiling according to the present invention will be described below with reference to the drawings. However, the following is merely an exemplary illustration of one embodiment of the present invention, and the scope of the present invention is not limited to the following embodiments and can be appropriately changed without departing from the spirit of the present invention.

[0022] A building 100 in one embodiment is a house, and FIG. 1 is a plan view looking down from above on a beam supporting a ceiling 1 on an arbitrary floor of the house. As shown in FIG. 1, in one embodiment of the structure of the ceiling 1 according to the present invention, inside the area surrounded by a plurality of first beams 2 which are H-shaped steels, there is a first section 20 in which the plurality of first beams 2 are assembled in a lattice pattern, and adjacent to the first section 20, there is a second section 30 in which a plurality of second beams 3 which are H-shaped steels with a vertical length shorter than the vertical length of the first beam 2 are assembled in a lattice pattern. Specifically, the vertical length of the second beam 3 in one embodiment is 200 mm shorter than the vertical length of the first beam 2. Also, in the indoor space 102 provided below the second section 30, a kitchen, a dining area, and a living area are allocated, and in the indoor space 101 provided below the first section 20, a bathroom, a passage, a staircase, and a garage are allocated.

[0023] As shown in Fig. 1, at the boundary between the first section 20 and the second section 30, one end 31 of the second beam 3 is joined to one side portion 21 of the first beam 2, and the joining is achieved by the first beam 2 winning. Figs. 2 and 3 are a plan view and a side view in which the range A in Fig. 1 is enlarged. As shown in Figs. 2 and 3, the plate-like joint portion 26 is arranged on the side portion 21 side of one web 23 of the first beam 2 so as to extend in the same in-plane direction as the web 33 of the second beam 3 joined to the first beam 2, and is fixed by welding to the upper flange 24, the web 23, and the lower flange 25. At this time, the joint portion 26 and one end 31 side of the web 33 of the second beam 3 joined to one side portion 21 of the first beam 2 have through holes. Then, two joint plates 4 having plate shapes and having through holes overlapping the through hole of the joint portion 26 and the through hole of the web 33 of the second beam 3 sandwich the joint portion 26 fixed to the first beam 2 and the web 33 of the second beam 3 together from both sides. Bolts are inserted into the overlapping through holes of the joint portion 26 joined to the first beam 2 and the two joint plates 4 and tightened with nuts, and bolts are inserted into the overlapping through holes of the web 33 of the second beam 3 and the two joint plates 4 and tightened with nuts, thereby firmly joining the first beam 2 and the second beam 3 at the boundary between the first section 20 and the second section 30. One side portion 21 of the first beam 2 refers to the side of the first beam 2 to which the second beam 6 is joined where one end of the second beam 3 is joined from the web 23 of the first beam 2, and the other side portion 22 of the first beam 2 refers to the side opposite to the one side portion 21 of the first beam 2 sandwiching the web 23 of the first beam 2 in the first beam 2 to which the second beam 6 is joined.

[0024] In one embodiment, as shown in FIG. 3(a), the first beam 2 and the second beam 3 are arranged and joined such that their upper surfaces are at the same height. Therefore, the joining plate material 4 used to join the first beam 2 and the second beam 3 at the boundary between the first section 20 and the second section 30 is L-shaped, and the joint 26 may be provided with two through-holes in the vertical direction and the web of the second beam 3 may be provided with two through-holes in the horizontal direction, and they are respectively fixed with the joining plate material 4, bolts, and nuts. Similarly, for the joining of the second beam 3 and the first beam 2 surrounding the first section 20 and the second section 30, the joining of the second beams 3 to each other, and the joining of the first beams 2 to each other, the joint 26, the joining plate material 4, bolts, and nuts are used for joining respectively.

[0025] Then, as shown in FIG. 1, two horizontal braces spanning horizontally are attached so as to cross each other in the ceiling supported by the first section 20 and in the ceiling supported by the second section 30. Here, the horizontal brace attached in the ceiling supported by the first section 20 is the first brace 5, and the horizontal brace attached in the ceiling supported by the second section 30 is the second brace 6. The first brace 5 is attached by fixing its end 51 to the first beam 2, and the second brace 6 is attached by fixing its end 61 to the first beam 2 or the second beam 3. Hereinafter, taking the range A in FIG. 1 as an example, the fixing method of the first brace 5 and the second brace 6 will be described. As shown in FIGS. 2 and 3(a), the first beam 2 to which the end 51 of the first brace 5 is fixed is provided with a through-hole on the other side portion 22 side of its lower flange 25, and the end 51 of the first brace 5 is provided with a through-hole overlapping the through-hole on the other side portion 22 side of the lower flange 25 of the first beam 2. The end 51 of the first brace 5 is fixed to the first beam 2 by inserting a bolt into the overlapping through-holes and tightening a nut. Then, a second brace fixing portion 27 which is plate-shaped and extends horizontally and is provided with a through-hole is fixed by welding to the first beam 2 on the one side portion 21 side of its web 23 to which the end 61 of the second brace 6 is fixed, and the end 61 of the second brace 6 is provided with a through-hole overlapping the through-hole of the second brace fixing portion 27. The end 61 of the second brace 6 is fixed to the first beam 2 by inserting a bolt into the overlapping through-holes and tightening a nut.

[0026] Although not shown, the method of fixing the end portion 51 of the first brace 5 to the first beam 2 is the same even outside the range A, and the method of fixing the end portion 61 of the second brace 6 to the second beam 3 is the same as the method of fixing the end portion 51 of the first brace 5 to the first beam 2. The end portion of the second brace 6 is fixed to the lower flange 35 of the second beam 3. Here, the height at which the second brace fixing portion 27 to which the end portion 61 of the second brace 6 is fixed is fixed to the web 32 of the first beam 2 is such that the second brace 6 can be mounted so as to span horizontally when the other end of the second brace 6 is fixed to the lower flange 35 of the second beam 3. Therefore, in one embodiment, the first brace 5 and the second brace 6 span horizontally at different heights.

[0027] Since the horizontal brace reinforces the structure formed by the structural body whose both ends are fixed by pulling the structural body as shown by the arrow E in FIGS. 2 and 3, a force that is always pulled in the direction in which each brace acts is applied to the first beam 2 to which the first brace 5 or the second brace 6 is fixed and the second beam 3 to which the second brace 6 is fixed. Therefore, in the first beam 2 in which the end portion 51 of the first brace 5 is fixed to the other side portion 22 side and the end portion 61 of the second brace 6 is fixed to the one side portion 21 side at a height different from that of the first brace 5, a force that rotates about the longitudinal direction of the first beam 2 as a central axis, that is, a force that rotates in the rotation direction C as shown in FIG. 3(a) is always applied, which may lead to twisting or breakage of the beam. Therefore, the first beam 2 to which the first brace 5 and the second brace 6 are fixed is reinforced by using the anti-tip hardware 7 to prevent the first beam 2 from twisting or breaking.

[0028] As shown in FIG. 6, one embodiment of the anti-tip hardware 7 according to the present invention includes a horizontal plate-shaped first fixing portion 71, a plate-shaped connecting portion 74 that bends from one end of the first fixing portion 71 and extends upward, a plate-shaped second fixing portion 72 that bends from the upper end of the connecting portion 74 and extends horizontally to form a Z shape, and an L-shaped plate that extends at a right angle to the surfaces of the first fixing portion 71, the second fixing portion 72, and the connecting portion 74, and is a stiffening portion 73 that is fixed to the side portions of the first fixing portion 71, the second fixing portion 72, and the connecting portion 74 by welding. The hardware has through holes 75 in the first fixing portion 71 and the second fixing portion 72.

[0029] As shown in FIGS. 2 and 3(a), the anti-tip hardware 7 is arranged such that the second fixing portion 72 overlaps the upper surface of one end 31 side of the lower flange 35 of the second beam 3 joined to the first beam 2 from above, and the first fixing portion 71 overlaps the upper surface of one side portion 21 side of the lower flange 25 of the first beam 2 to which the second beam 3 is joined from above. The lower flange 25 of the first beam 2 that overlaps the first fixing portion 71 and the lower flange 35 of the second beam 3 that overlaps the second fixing portion 72 each have through holes that overlap the through holes 75 of the anti-tip hardware 7. By inserting bolts into the overlapping through holes and tightening nuts, the anti-tip hardware 7 is fixed to the first beam 2 and the second beam 3. In this state, the stiffening portion 73 of the anti-tip hardware 7 extends in a posture parallel to the plane formed by the longitudinal direction of the second beam 3 to which the anti-tip hardware 7 is fixed and the vertical direction, and functions as a stiffener against the force rotating in the rotation direction C applied to the first beam 2, preventing the torsion and breakage of the first beam 2. The anti-tip hardware 7 is fixed at all locations where the first beam 2 to which the first brace 5 and the second brace 6 are fixed and the second beam 3 are joined, and it is desirable to fix the anti-tip hardware 7 before attaching the first brace 5 and the second brace 6. Also, as shown in FIG. 2(a), it is possible to reinforce at the location where the first beam 2 and the second beam 3 are joined using one anti-tip hardware 7, and as shown in FIG. 2(b), it is possible to reinforce at the location where the first beam 2 and the second beam 3 are joined using two anti-tip hardware 7, and reinforcing with two anti-tip hardware 7 can provide stronger reinforcement.

[0030] Then, as shown in FIG. 4(a), the floor board material 12 is fixed above the first beam 2 and the second beam 3, and the ceiling board material 11 is fixed below the first beam 2 and the second beam 3. At this time, the vertical length of the second beam 3 is shorter than the vertical length of the first beam 2, and the first beam 2 and the second beam 3 are arranged such that their upper surfaces are at the same height. Therefore, a gap D1 is formed between the lower surface of the second beam 3 and the upper surface of the ceiling board material 11 located below the second beam 3. For example, pipes such as electric conduits and drain pipes, or sound insulation materials and heat insulation materials can be effectively utilized by arranging them in the gap D1. Since the gap D1 is close to the indoor space 102 located below the ceiling 1 supported by the second beam 3, it can be effectively used for the indoor space 102 located below the ceiling 1 supported by the second beam 3.

[0031] Also, as another embodiment, as shown in FIG. 4(b), the floor board material 12 is fixed above the first beam 2 and the second beam 3, the ceiling board material 11 is fixed below the first beam 2, and below the second beam 3, the ceiling board material 11 is fixed higher by the difference in the vertical lengths of the first beam 2 and the second beam 3 than the ceiling board material 11 fixed below the first beam 2. Thereby, the ceiling 1 supported by the second beam 3 becomes a folded-up ceiling, and the indoor space 102 located below the second section 30 becomes longer by the difference in the vertical lengths of the first beam 2 and the second beam 3 compared to the ceiling height of the indoor space 101 located below the first section 20, and a sense of openness can be obtained.

[0032] Also, as another embodiment, as shown in FIG. 3(b), the lower surface of the second beam 3 having a vertical length shorter than that of the first beam 2 is arranged to be at the same height as the lower surface of the first beam 2. The first brace 5 is fixed to the upper flange 24 of the first beam 2, and the second brace 6 is fixed to the second brace fixing portion 27 fixed to the web 23 of the first beam 2 such that the other end of the second brace 6 is horizontally spanned when fixed to the upper flange 34 of the second beam 3. And the first fixing portion 71 of the anti-tip fitting 7 can be fixed to the upper flange 24 of the first beam 2, and the second fixing portion 72 can be fixed to the upper flange 34 of the second beam 3. In this case, as shown in FIG. 5(a), when the floor board material 12 is fixed above the first beam 2 and the second beam 3, and the ceiling board material 11 is fixed below the first beam 2 and the second beam 3, a gap D2 is formed between the upper surface of the second beam 3 and the lower surface of the ceiling board material 11 located above the second beam 3. For example, pipes such as electric conduits and drain pipes, or sound insulation materials and heat insulation materials can be effectively utilized by arranging them in this gap D2. Since the gap D2 is close to the indoor space 104 located above the ceiling 1 supported by the second beam 3, it can be effectively used for the indoor space 104 located above the ceiling 1 supported by the second beam 3.

[0033] Furthermore, as shown in FIG. 5(b), the ceiling board material 11 is fixed below the first beam 2 and the second beam 3, the floor board material 12 is fixed above the first beam 2, and above the second beam 3, the floor board material 12 is fixed higher by the difference in the vertical lengths of the first beam 2 and the second beam 3 than the floor board material 12 fixed above the first beam 2. Thereby, the floor of the indoor space 104 located above the ceiling 1 supported by the second beam 3 becomes a skip floor that is one step lower than the floor level of the same floor, and the indoor space 104 located above the second section 30 and the indoor space 103 located above the first section 20 can be made distinct, and the effect that it looks visually wider than the actual area can be obtained.

[0034] In the above embodiments, the case where the first beam 2 and the second beam 3 have different vertical lengths has been described, but the first beam 2 and the second beam 3 may have the same vertical length.

[0035] Also, as an embodiment of the anti - tipping hardware 7, although the Z - shaped anti - tipping hardware 7 has been described as shown in FIG. 6, as shown in FIG. 3(c), it is a cube, the lower surface of which is a first fixing portion 71 having a through - hole 75 for fixing to the first beam 2, and the upper surface of which is a second fixing portion 72 having a through - hole 75 for fixing to the second beam 3. It may be an anti - tipping hardware 7 arranged to be sandwiched between the lower flange 25 of the first beam 2 and the lower flange 35 of the second beam 3 and fixed to the first beam 2 and the second beam 3. In this case, since it is a cube, the entire anti - tipping hardware 7 can function as a supplementary rigid portion 73.

Industrial Applicability

[0036] The ceiling structure and the anti - tipping hardware according to the present invention are expected to be favorably adopted particularly in the construction industry and can contribute to the development of the construction industry.

Explanation of Reference Numerals

[0037] 100 Building 1 Ceiling 11 Ceiling board 12 Floor board 2 First beam 20 First section 21 One side portion of the first beam 22 The other side portion of the first beam 3 Second beam 30 Second section 31 One end of the second beam 5 First brace 51 End portion of the first brace 6 Second brace 61 End portion of the second brace 7 Anti - tipping hardware 71 First fixing portion 72 Second fixing portion 73 Supplementary rigid portion

Claims

1. A first section assembled in a grid pattern by a plurality of first beams, In a building where the ceiling on the same floor is supported by a second section adjacent to the first section and assembled in a grid pattern by a plurality of second beams, At the boundary between the first section and the second section, one end of the second beam is joined to one side portion of the first beam, One end of a first brace extending horizontally within the first section is fixed to the other side portion of the first beam to which the second beam is joined, One end of a second brace extending horizontally within the second section at a height different from the height at which the first brace is installed is fixed to one side portion of the first beam to which the second beam is joined, A horizontal plate-like first fixing portion having a vertical fixing hole, overlapping the horizontal surface of the first beam, and fixed to the first beam, A plate-like connecting portion bent from one end of the first fixing portion and extending vertically, A second fixing portion bent horizontally from one end of the connecting portion so as to be Z-shaped, having a vertical fixing hole, overlapping the horizontal surface of the second beam, and fixed to the second beam, Comprising, An L-shaped plate-like member extending at a right angle to the surfaces of the first fixing portion, the second fixing portion, and the connecting portion, and having rigidity in a direction parallel to the in-plane direction of the plane formed by the longitudinal direction of the second beam joined to one side portion of the first beam and the vertical direction. By means of an anti-tilting metal fitting, one side portion of the first beam to which one end of the second beam is joined and one end of the second beam joined to one side portion of the first beam are fixed to each other. The ceiling structure is characterized by this.

2. The vertical length of the second beam is shorter than the vertical length of the first beam, The ceiling structure according to claim 1, wherein the second beam and the first beam are arranged such that the upper surface of the second beam and the upper surface of the first beam are at the same height.

3. The ceiling board fixed below the second beam is fixed higher than the ceiling board fixed below the first beam by the difference in the vertical lengths of the first beam and the second beam. The ceiling structure according to claim 2 is characterized by this.

4. The vertical length of the second beam is shorter than the vertical length of the first beam, The ceiling structure according to claim 1, wherein the second beam and the first beam are arranged such that the lower surface of the second beam and the lower surface of the first beam are at the same height.

5. The floor board material fixed above the second beam is fixed lower by the difference in the vertical lengths of the first beam and the second beam than the floor board material fixed above the first beam. The ceiling structure according to claim 4, characterized in that.

6. In a structure in which one end of a second beam is joined to one side portion of a first beam, an anti-tilting metal fitting for fixing the first beam and the second beam to each other, Having a fixing hole in the vertical direction, overlapping the horizontal surface of the first beam, and a horizontal plate-shaped first fixing portion fixed to the first beam, A plate-shaped connecting portion that bends from one end of the first fixing portion and extends in the vertical direction, It bends from one end of the connecting portion so as to be Z-shaped and extends horizontally, has a fixing hole in the vertical direction, overlaps the horizontal surface of the second beam, and a second fixing portion fixed to the second beam, An anti-tilting metal fitting comprising an L-shaped plate-shaped portion that extends at a right angle to the surfaces of the first fixing portion, the second fixing portion, and the connecting portion, and has rigidity in a direction parallel to the in-plane direction of the plane formed by the longitudinal direction of the second beam and the vertical direction.

Images