JP7476127B2 - Beam support structure and beam support method - Google Patents

Description

The present invention relates to a beam support structure and beam support method for supporting wooden beams.

Patent document 1 discloses a structure in which wooden beams are placed between pillars.

JP 2020-133356 A

In recent years, the active use of wood, which absorbs and fixes carbon dioxide, as a building material has been promoted in order to reduce greenhouse gas emissions. Also, in buildings with wooden beams such as those described in Patent Document 1, the wooden beams are sometimes exposed indoors as an exposed finish to improve the aesthetics of the living space.

On the other hand, wood is prone to creep, a phenomenon that causes it to gradually warp over time, making it unsuitable for use as a beam material with a relatively long span to be used to create large spaces such as halls. One way to prevent warping from occurring is to increase the beam depth of the wooden beams, but this would increase construction costs due to the higher material costs, and there is also the risk of a feeling of oppression being created by the beams overhanging downwards.

The present invention aims to provide a beam support structure that can suppress the deflection of wooden beams.

The present invention is a beam support structure that supports wooden beams, and includes at least one wooden beam that is spanned between columns or beams, a structure that is spanned perpendicular to the wooden beam, and a connecting member that connects the wooden beam to the structure at the point where the wooden beam and the structure intersect, and the structure includes at least one of a steel frame and reinforced concrete, and is spanned above the wooden beam.

The present invention also provides a beam support method for supporting wooden beams, which includes the steps of bridging the wooden beam between columns or beams, bridging a structure including at least one of steel frame and reinforced concrete above the wooden beam so as to be perpendicular to the wooden beam, and joining the wooden beam to the structure with a joining member at the intersection of the wooden beam and the structure.

The present invention makes it possible to suppress the deflection of wooden beams.

1 is a perspective view showing an image of a space to which a beam support structure according to an embodiment of the present invention is applied; FIG. 2 is a cross-sectional view of the beam support structure according to the first embodiment of the present invention, taken along line AA in FIG. 3 is an enlarged cross-sectional view showing a cross section taken along line BB in FIG. 2. FIG. 3 is a diagram for explaining a beam supporting method according to the first embodiment of the present invention, and is a diagram showing a cross section corresponding to FIG. 2 . 10A to 10C are diagrams showing a modified example of the beam support structure according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view of a beam support structure according to a second embodiment of the present invention, showing a cross section corresponding to FIG. 3 . 10 is a cross-sectional view of a modified example of the beam support structure according to the second embodiment of the present invention, which is a cross-sectional view corresponding to FIG. 2 . FIG. FIG. 11 is a cross-sectional view of a beam support structure according to a third embodiment of the present invention, showing a cross section corresponding to FIG. 10 is a cross-sectional view of a modified example of the beam support structure according to the third embodiment of the present invention, which is a cross-sectional view corresponding to FIG. 3. FIG. FIG. 4 is a cross-sectional view of a reference example of a beam support structure, which is a cross-sectional view corresponding to FIG. 3 .

Below, a beam support structure and a beam support method according to an embodiment of the present invention will be described with reference to the drawings.

First Embodiment
A beam support structure 100 according to the first embodiment will be described with reference to Figures 1 to 4. The beam support structure 100 supports a wooden beam that is spanned between pillars or beams, and supports a wooden beam 10 that spans a space 1 from above, as shown in Figure 1. Figure 1 is an image (one-point perspective view) of a space 1 constructed using the beam support structure 100 according to the first embodiment.

The space 1 shown in Figure 1 is a relatively wide-span space, such as a hall or lecture hall, with multiple beams spanning the ceiling.

In recent years, when constructing such relatively large spaces 1 where many people can gather, wooden beams 10 made of solid wood or laminated wood are used as beams, and the wooden beams 10 are exposed from the ceiling surface and hung across the space, improving the texture of the space 1 and creating a traditional, relaxed atmosphere.

On the other hand, wooden beams 10 are subject to creep, a phenomenon in which the deflection gradually increases over time, making them unsuitable as long-span beams used to create relatively large spaces 1 such as halls and auditoriums.

To prevent such deflection, it is possible to increase the beam depth (height in the load direction) of the wooden beams 10, or to support multiple wooden beams 10 from below with highly rigid members. However, in either case, there is a risk that the downward projection will create a feeling of oppression, and that the increased material costs will increase construction costs.

To solve this problem, in the first embodiment, the wooden beam 10 is supported from above by a structure 20 made of steel, thereby preventing the wooden beam 10 from bending.

Next, the specific configuration of the beam support structure 100 will be described with reference to Figures 2 and 3. Figure 2 shows a cross section of the wooden beam 10 and the structural body 20 along line A-A in Figure 1 (line A-A in Figure 3), and Figure 3 shows a cross section along line B-B in Figure 2.

As shown in Figures 2 and 3, the beam support structure 100 includes a plurality of wooden beams 10 that are spanned between columns (not shown) or between beams (not shown), a structure 20 that is spanned perpendicular to the wooden beams 10, and a joining member 30 that joins the wooden beams 10 and the structure 20 at the intersection of the wooden beams 10 and the structure 20.

The wooden beam 10 is a square timber made of solid wood or laminated timber, and its surface is treated to be fire-retardant. A groove 11 of a predetermined depth is formed on the upper surface of the wooden beam 10 facing the structure 20 in the extension direction of the structure 20, i.e., along the beam width direction of the wooden beam 10. In addition, the wooden beam 10 is provided with a recess 12 formed by hollowing out a predetermined depth from the groove 11 along the beam formation direction. Note that the wooden beam 10 does not need to be treated to be fire-retardant.

The structure 20 is an H-shaped steel material (steel beam) having a pair of flange portions 21, 22 and a web portion 23 sandwiched between the pair of flange portions 21, 22. The structure 20 is suspended above multiple wooden beams 10 with its strong axis direction aligned vertically, and its ends are each joined to a column or beam (not shown). The structure 20 shown in FIG. 1 is a single H-shaped steel material that intersects with the wooden beam 10 at approximately the center of the wooden beam 10 in the material axis direction, but the number of structures 20 is not limited to one, and multiple structures 20 may be provided at a predetermined interval in the material axis direction of the wooden beam 10.

Of the pair of flanges 21, 22, the lower flange 22 facing the upper surface of the wooden beam 10 also serves as the second joining hardware of the joining member 30 that joins the wooden beam 10 to the structure 20, and the lower flange 22 has an insertion hole 22a through which the bolt 35, which is a fastening member, is inserted.

In addition, a rib plate 24 is provided on the structure 20 for reinforcement, the rib plate 24 being fixed by welding across the web portion 23 and the lower flange 22.

The joint member 30 is composed of a first joint metal 31 embedded in the wooden beam 10, a lower flange 22 as a second joint metal provided on the structure 20, and a bolt 35 and a nut 36 (fastening member) that fasten the first joint metal 31 and the lower flange 22.

The first joint metal 31 is a steel member having a plate-shaped portion 32 that is inserted into the recess 12 of the wooden beam 10 and a plate-shaped flange portion 33 that extends from the upper end of the plate portion 32 in the beam width direction of the wooden beam 10, and is formed in a T-shape in the cross-sectional view shown in Figure 2.

The plate portion 32 is provided with a plurality of through holes 32a formed to penetrate the plate in the thickness direction. The wooden beam 10 is also provided with through holes 13 formed to penetrate the beam width direction at locations corresponding to the through holes 32a. These through holes 13, 32a are used as insertion holes into which cylindrical drift pins 37 are inserted.

The axial length of the drift pin 37 is set to be approximately the same as the beam width of the wooden beam 10. Therefore, when the plate portion 32 is inserted into the recess 12 of the wooden beam 10, the first joint metal 31 is fixed to the wooden beam 10 by inserting the drift pin 37 into each through hole 13, 32a.

The width of the flange portion 33 in the material axis direction of the wooden beam 10 is set to be slightly smaller than the width of the groove portion 11 formed in the wooden beam 10, as shown in FIG. 3. The plate thickness of the flange portion 33 is set to be approximately the same as the depth of the groove portion 11 formed in the wooden beam 10. Therefore, when the first joint metal 31 is attached to the wooden beam 10, the flange portion 33 is accommodated in the groove portion 11, and the upper surface of the flange portion 33 is approximately flush with the upper surface of the wooden beam 10.

In addition, the flange portion 33 has an insertion hole 33a through which the bolt 35 is inserted at a location corresponding to the insertion hole 22a formed in the lower flange 22.

The bolt 35 is inserted through the insertion holes 22a, 33a formed in the lower flange 22 and the flange portion 33, and the first joint metal 31 and the lower flange 22 are fastened together by tightening the bolt 35 and the nut 36. As a result, the wooden beam 10 is supported from above by the structure 20 via the joint member 30.

Next, referring to Figure 4, a method for supporting a wooden beam 10 using the beam support structure 100 configured as described above will be described. Figure 4 shows a cross section corresponding to Figure 2, and shows the state before tightening with the bolts 35 and nuts 36.

First, as shown in FIG. 4, multiple wooden beams 10 with first metal joints 31 attached are respectively spanned between columns or beams (not shown), and then the structure 20 having the above configuration is spanned above the wooden beams 10. Note that it does not matter whether the wooden beams 10 or the structure 20 are spanned first.

When the wooden beam 10 and the structure 20 are stretched together, a predetermined gap G1 of several millimeters to several tens of millimeters is provided between the upper surface of the flange portion 33 of the first joint metal fitting 31 attached to the wooden beam 10 and the lower surface of the lower flange 22 of the structure 20. In other words, the structure 20 is stretched while being offset upward with respect to the wooden beam 10 so as not to come into contact with the wooden beam 10.

Next, a bolt 35 is inserted through the insertion hole 33a of the first connecting metal 31 attached to the wooden beam 10 and through the insertion hole 22a provided in the lower flange 22 of the structure 20, and the bolt 35 and nut 36 are tightened. As a result, as shown in FIG. 2, the lower flange 22 of the structure 20 and the flange portion 33 of the first connecting metal 31 are fastened in the vertical direction, and the wooden beam 10 is supported by the structure 20.

After the wooden beams 10 are supported by the structure 20 in this way, a deck plate (not shown) is laid above the wooden beams 10, and concrete is then poured onto the deck plate to construct the slab for the upper floor. Once the slab for the upper floor is constructed, the structure 20, which is made up of inorganic steel beams, cannot be seen from below, highlighting the warm texture created by the wooden beams 10.

Here, by providing the above-mentioned predetermined gap G1 in advance, in the process of tightening the bolts 35 and nuts 36, the wooden beam 10, which has a lower rigidity than the structural body 20 made of steel, is gradually displaced upward toward the structural body 20 so that the predetermined gap G1 at the point where it is joined to the structural body 20 is gradually narrowed. In other words, by joining the wooden beam 10 to the structural body 20 via the joining member 30, the height from the floor surface at the point where it is joined to the structural body 20 is higher than the height at both ends, that is, the point where it is joined to the structural body 20 is curved upward.

In this way, the wooden beam 10 is supported by the structure 20 in an upwardly curved state, so that the wooden beam 10 can be reliably prevented from bending downward over time. This makes it possible to use the wooden beam 10 as a long-span beam material, for example, a long span of more than 10 m, and as a result, it is possible to improve the aesthetics of a relatively large space 1 such as a hall or lecture hall.

The specified gap G1 is not necessarily required, and even if the specified gap G1 as described above is not provided, the wooden beam 10 is supported from above by the highly rigid structure 20, so it is possible to sufficiently prevent the wooden beam 10 from sagging over time.

In addition, because the structure 20 is placed above the wooden beams 10, the portion on which the structure 20 is installed will protrude onto the upper floor. For this reason, if a space such as a living room is provided on the upper floor, it is preferable to place the protruding portion of the structure 20 inside the partition wall of the living room. However, if the upper floor is a non-living space such as a rooftop or machine room, the structure 20 may be left exposed as it is.

The first embodiment described above provides the following advantages:

In the beam support structure 100 configured as described above, the wooden beam 10 that is spanned between the columns or beams is supported from above by a structure 20 made of a steel frame that is more rigid than the wooden beam 10. This makes it possible to prevent the wooden beam 10 from sagging downward over time.

By suppressing the deflection of the wooden beams 10 in this way, it becomes possible to use the wooden beams 10 as beam materials when constructing halls and auditoriums, which require beam materials with relatively long spans, and as a result, the texture of a relatively large space 1 such as a hall or auditorium can be improved.

In addition, the structure 20 that supports the wooden beams 10 is positioned above the wooden beams 10, which avoids a feeling of oppression and maintains the sense of spaciousness of the space 1. In addition, the structure 20 is less noticeable to the public, which improves the aesthetics of the space 1.

In addition, by using a highly rigid and relatively inexpensive steel frame as the structure 20 that supports the wooden beams 10, a single structure 20 can stably support multiple wooden beams 10 and reduce construction costs.

In addition, by setting the joining direction between the wooden beam 10 and the structure 20 by the joining member 30 to be the up-down direction, it is possible to reliably prevent the wooden beam 10 from bending and improve the workability of the joining work.

In addition, the flange portion 33 of the first joint metal 31 is housed in the groove portion 11 formed in the wooden beam 10, making the upper surface of the flange portion 33 flush with the upper surface of the wooden beam 10, and the first joint metal 31 and the wooden beam 10 have an integrated and simple configuration, which makes it possible to improve the appearance without compromising the aesthetic appeal of the wooden beam 10.

The following modified examples are also within the scope of the present invention, and it is possible to combine the configurations shown in the modified examples with the configurations described in the above embodiments, or to combine the configurations described in the different modified examples below.

In the first embodiment, the lower flange 22 also serves as the second metal joint of the joining member 30 that joins the wooden beam 10 and the structure 20. Alternatively, as in the modified example shown in FIG. 5, an extension flange 26 welded to the side of the lower flange 22 may be used as the second metal joint of the joining member 30.

The extension flange 26 is a plate-like member having a thickness equivalent to that of the lower flange 22, and is disposed opposite the flange portion 33 of the first joint metal member 31. In addition, the extension flange 26 is formed with an insertion hole 26a through which the bolt 35 is inserted at a location corresponding to the insertion hole 33a formed in the flange portion 33.

In addition, the structure 20 of this modified example is provided with a first rib plate 27 welded across the upper flange 21, the lower flange 22, the web portion 23, and the extension flange 26, and a second rib plate 28 arranged opposite the first rib plate 27 across the web portion 23, to reinforce the joint between the lower flange 22 and the extension flange 26.

In this modified example, the extension flange 26 on the structure 20 and the flange portion 33 of the first connecting metal 31 are fastened in the vertical direction by bolts 35 and nuts 36, so that the wooden beam 10 is supported by the structure 20, as in the first embodiment.

In this way, in the modified example shown in FIG. 5, the insertion holes 26a through which the bolts 35 are inserted are provided in the extension flange 26, not in the lower flange 22. This eliminates the need to drill through holes in the H-shaped steel material that constitutes the structure 20, and makes it possible to maintain the rigidity of the structure 20. This is therefore useful when a beam that requires high rigidity, such as a girder, is used as the structure 20.

In the first embodiment, the bolts 35 and nuts 36 are used as fastening members for fastening the flange portion 33 of the first connecting metal 31 to the lower flange 22 as the second connecting metal. Alternatively, any fastening member that can be fastened in the vertical direction may be used, for example, a combination of a headless cut bolt (full thread) welded to the underside of the lower flange 22 and a nut, or a combination of a cut bolt welded to the top surface of the flange portion 33 of the first connecting metal 31 and a nut.

In addition, in the first embodiment, the flange portion 33 of the first connecting metal 31 is accommodated in the groove portion 11 formed in the wooden beam 10, and the upper surface of the flange portion 33 is approximately flush with the upper surface of the wooden beam 10. Alternatively, the groove portion 11 may not be provided in the wooden beam 10, and the flange portion 33 may be placed on the upper surface of the wooden beam 10 when the first connecting metal 31 is attached to the wooden beam 10.

In the first embodiment, the structure 20 is offset upward from the wooden beam 10 to form a predetermined gap G1. Alternatively, a pre-curved structure 20 may be placed above the wooden beam 10, i.e., a structure 20 that is curved upward may be placed to form a gap between the wooden beam 10 and the structure 20.

In addition, in the first embodiment, multiple wooden beams 10 are supported by the structure 20, but the number of supported wooden beams 10 may be only one.

Second Embodiment
Next, a beam support structure 200 according to a second embodiment of the present invention will be described with reference to Fig. 6. Below, differences from the first embodiment will be mainly described, and descriptions of configurations that are the same as or equivalent to those described in the first embodiment will be omitted.

The beam support structure 200 according to the second embodiment differs from the beam support structure 100 according to the first embodiment described above in that the structure 120 is made of reinforced concrete. Note that FIG. 6 is a cross-sectional view showing a cross section corresponding to FIG. 3.

As shown in FIG. 6, the beam support structure 200 includes a wooden beam 10 that is spanned between columns (not shown) or between beams (not shown), a structure 120 that is spanned perpendicular to the wooden beam 10, and a joining member 130 that joins the wooden beam 10 and the structure 120 at the intersection of the wooden beam 10 and the structure 120. Note that the wooden beam 10 has the same configuration as in the first embodiment, so a description thereof will be omitted.

The structure 120 is a reinforced concrete beam cast on-site so as to span above the multiple wooden beams 10, and its ends are each joined to a pillar or beam (not shown). The structure 120 may also be made of precast material manufactured in advance at a factory.

The joint member 130 is composed of a first joint metal 31 embedded in the wooden beam 10, a second joint metal 122, 135a embedded in the structure 120, and a male threaded portion 135b and a nut 136 (fastening member) that fasten the first joint metal 31 and the second joint metal 122, 135a.

The first connecting metal fitting 31 has the same configuration as in the first embodiment described above, so its description will be omitted.

The second joint metal 122, 135a is composed of a flat buried plate 122 and a hook portion 135a of a U-shaped hook anchor bolt 135 welded to the buried plate 122.

The buried plate 122 has an insertion hole 122a formed in the plate thickness direction, through which the male threaded portion 135b of the anchor bolt 135 is inserted. The buried plate 122 and the anchor bolt 135 are integrated by welding the anchor bolt 135 to the buried plate 122 with the male threaded portion 135b of the anchor bolt 135 inserted into the insertion hole 122a.

When the structure 120 is cast, the second connecting metal fittings 122, 135a configured in this manner are embedded so that the plane from which the male threaded portion 135b of the anchor bolt 135 protrudes out of the two flat surfaces of the embedded plate 122 is flush with the underside of the structure 120.

As a result, the embedded plate 122 used as the second connecting metal and the hook portion 135a of the anchor bolt 135 are embedded in the structure 120, while the male thread portion 135b of the anchor bolt 135, which is the fastening member, protrudes from the structure 120.

The male threaded portion 135b protruding from the structure 120 is inserted into the insertion hole 33a formed in the flange portion 33 of the first connecting metal 31, and the nut 136 is tightened onto the male threaded portion 135b, thereby fastening the first connecting metal 31 and the second connecting metal 122, 135a. As a result, the wooden beam 10 is supported from above by the structure 120 via the connecting member 130, as in the first embodiment.

As in the first embodiment, the slab for the upper floor may be constructed by laying a deck plate (not shown) above the wooden beams 10 and then pouring concrete onto the deck plate.

The second embodiment described above provides the following advantages:

In the beam support structure 200 configured as above, the wooden beam 10 that is spanned between the columns or beams is supported from above by a structure 120 made of reinforced concrete that is more rigid than the wooden beam 10. Therefore, as in the first embodiment, downward bending of the wooden beam 10 over time can be suppressed, and the same effect as the first embodiment can be achieved.

In addition, because the structure 120 of the beam support structure 200 configured as described above is made of reinforced concrete, its surface is uneven compared to steel plates. Therefore, the surface of the structure 120 is not suitable as a joint surface with other components. However, in the beam support structure 200 configured as described above, the flat surface of the embedded plate 122 is exposed on the underside of the structure 120, which is the joint surface with the first joint metal 31. This ensures surface contact between the structure 120 and the wooden beam 10, and as a result, the wooden beam 10 can be stably supported by the structure 120.

The following modified examples are also within the scope of the present invention, and it is possible to combine the configurations shown in the modified examples with the configurations described in the above embodiments, or to combine the configurations described in the different modified examples below.

In the second embodiment, the embedded plate 122 and the hook portion 135a of the anchor bolt 135 are embedded in the structure 120 as the second connecting metal. Alternatively, the embedded plate 122 may not be provided, and only the hook portion 135a of the anchor bolt 135 may be embedded in the structure 120 as the second connecting metal. Note that it is preferable to provide the embedded plate 122 in order to precisely match the interval at which the male thread portion 135b is provided to the interval at which the insertion holes 33a are provided.

In the second embodiment, the portion of the anchor bolt 135 embedded in the structure 120 is a U-shaped hook portion 135a. Alternatively, the portion of the anchor bolt 135 embedded in the structure 120 may have a shape that can function as a retainer, and may be formed, for example, in an L-shape or a flange-like shape like the head of a hexagonal bolt.

In the second embodiment, the hook portion 135a, which is the second connecting metal, and the male thread portion 135b, which is the fastening member, are integrally configured as the anchor bolt 135. Alternatively, the hook portion 135a and the male thread portion 135b may be separate members, in which case the hook portion 135a is configured by welding a U-shaped or L-shaped member to one surface of the buried plate 122, and the male thread portion 135b is configured by welding a cut bolt (full thread) to the other surface of the buried plate 122.

In the second embodiment, the structure 120 is provided with a male thread portion 135b. Alternatively, the structure 120 may be provided with a female thread portion, as in the modified example shown in FIG. 7. FIG. 7 is a cross-sectional view showing a cross section corresponding to FIG. 2.

In this modified example, a long nut 138 embedded in the structure 120 and a bolt 137 screwed into the long nut 138 are provided as joining members for joining the wooden beam 110 and the structure 120.

The wooden beam 110 has an insertion hole 113 through which the bolt 137 is inserted formed along the beam formation direction, and a storage groove 112 for accommodating the head of the bolt 137. Two or more insertion holes 113 are provided in the material axis direction of the wooden beam 110, i.e., in the beam width direction of the structure 120. The storage groove 112 is a groove formed along the material axis direction of the wooden beam 110, and multiple insertion holes 113 open on its bottom surface.

The long nut 138 is a cap nut with a female thread formed on its inner circumferential surface, and multiple protrusions (not shown) are provided on its outer circumferential surface to prevent it from coming loose.

By tightening the bolt 137 inserted through the insertion hole 113 formed in the wooden beam 110 to the long nut 138 embedded in the structure 120, the wooden beam 110 is supported from above by the reinforced concrete structure 120, as in the second embodiment.

In order to transmit the axial force of the bolts 137 evenly to the wooden beam 110, it is preferable to interpose a metal plate 139 between the bottom surface of the accommodation groove 112 and the heads of the bolts 137. In order to prevent the wooden beam 110 from being deformed or damaged by the axial force of the bolts 137, a metal sleeve may be provided in the insertion hole 113. In order to prevent the heads of the bolts 137 from being visible from below the wooden beam 110, it is preferable to provide a wooden cover material 115 that covers the opening of the accommodation groove 112.

In the second embodiment, the reinforced concrete structure 120 is configured as a beam. Alternatively, the reinforced concrete structure 120 may be configured as part of a partition wall on the upper floor.

Third Embodiment
Next, a beam support structure 300 according to a third embodiment of the present invention will be described with reference to Fig. 8. Below, differences from the first embodiment will be mainly described, and descriptions of configurations that are the same as or equivalent to those described in the first embodiment will be omitted.

The beam support structure 300 according to the third embodiment differs from the beam support structure 100 according to the first embodiment described above in that the structure 220 is made of steel-reinforced concrete. Note that FIG. 8 is a cross-sectional view showing a cross section corresponding to FIG. 3.

As shown in FIG. 8, the beam support structure 300 includes a wooden beam 10 that is spanned between columns (not shown) or between beams (not shown), a structure 220 that is spanned perpendicular to the wooden beam 10, and a joining member 230 that joins the wooden beam 10 and the structure 220 at the intersection of the wooden beam 10 and the structure 220. Note that the wooden beam 10 has the same configuration as in the first embodiment, so a description thereof will be omitted.

The structure 220 is a steel-reinforced concrete beam cast on-site so as to span above the multiple wooden beams 10, and its ends are each joined to columns or beams (not shown). The structure 220 may also be made of precast material manufactured in advance at a factory.

The structure 220 includes an H-shaped steel material 221 (steel beam) having a pair of flange portions 222, 223 and a web portion 224 sandwiched between the pair of flange portions 222, 223, and the H-shaped steel material 221 is embedded in the structure 220 with its strong axis direction aligned vertically.

The H-shaped steel material 221 also serves as the second connecting hardware of the connecting member 230 that connects the wooden beam 10 and the structure 220, and of the pair of flange portions 222, 223, the lower flange 223 that faces the upper surface of the wooden beam 10 has a cut bolt 235 (full thread) welded to the underside as a fastening member.

The connecting member 230 is composed of a first connecting metal 31 embedded in the wooden beam 10, an H-shaped steel material 221 (a second connecting metal material) embedded in the structure 220, and a cut bolt 235 and a nut 236 (a fastening member) that fasten the first connecting metal 31 and the H-shaped steel material 221.

The first connecting metal fitting 31 has the same configuration as in the first embodiment described above, so its description will be omitted.

When the structure 220 is cast, the H-shaped steel material 221 to which the cut bolt 235 is welded is embedded in the structure 220 with the cut bolt 235 protruding a predetermined length.

As a result, the H-shaped steel material 221, which is the second connecting metal, is embedded in the structure 220, while the cut bolt 235, which is the fastening member, protrudes from the structure 220.

The cut bolt 235 protruding from the structure 220 in this way is inserted into the insertion hole 33a formed in the flange portion 33 of the first connecting metal 31, and the nut 236 is tightened onto the cut bolt 235, thereby fastening the first connecting metal 31 and the H-shaped steel material 221. As a result, the wooden beam 10 is supported from above by the structure 220 via the connecting member 230, as in the first embodiment.

As in the first embodiment, the slab for the upper floor may be constructed by laying a deck plate (not shown) above the wooden beams 10 and then pouring concrete onto the deck plate.

The third embodiment described above provides the following advantages:

In the beam support structure 300 configured as above, the wooden beam 10 that is spanned between the columns or beams is supported from above by a structure 220 made of steel reinforced concrete, which has higher rigidity than the wooden beam 10. Therefore, as in the first embodiment, downward bending of the wooden beam 10 over time can be suppressed, and the same effect as the first embodiment can be achieved.

The following modified examples are also within the scope of the present invention, and it is possible to combine the configurations shown in the modified examples with the configurations described in the above embodiments, or to combine the configurations described in the different modified examples below.

In the third embodiment, the H-shaped steel material 221 embedded in the steel-reinforced concrete structure 220 also serves as the second joint metal of the joint member 230. Alternatively, as in the modified example shown in FIG. 9, a flange member 237 welded to the lower flange 223 of the H-shaped steel material 221 may be used as the second joint metal of the joint member 230.

The flange member 237 is a steel member having a flange portion 237a that is arranged parallel to the lower flange 223 of the H-shaped steel material 221, and an extension portion 237b that extends from the flange portion 237a toward the lower flange 223, and is formed in a T-shape in the cross-sectional view shown in FIG. 9.

The flange member 237 is formed, for example, by cutting a commercially available H-shaped steel material, and has a length in the beam width direction of the wooden beam 10 equal to the length of the flange portion 33 of the first connecting metal 31. The flange portion 237a of the flange member 237 has an insertion hole 237c through which the bolt 238 is inserted, at a location corresponding to the insertion hole 33a formed in the flange portion 33 of the first connecting metal 31. The bolt 238 inserted into the insertion hole 237c is welded and fixed to the flange portion 237a in advance with the threaded portion protruding in the opposite direction to the extension portion 237b.

The flange member 237 thus constructed is integrated with the H-shaped steel material 221 by welding the extension portion 237b to the lower flange 223 of the H-shaped steel material 221.

The H-shaped steel material 221 to which the flange member 237 is welded is embedded so that the surface of the flange portion 237a from which the threaded portion of the bolt 238 protrudes is flush with the underside of the structure 220 when the structure 220 is cast.

As a result, the flange member 237, which is the second connecting metal, is embedded in the structure 220, while the threaded portion of the bolt 238, which serves as the fastening member, protrudes from the structure 220.

In this way, the threaded portion of the bolt 238 protruding from the structure 220 is inserted into the insertion hole 33a formed in the flange portion 33 of the first connecting metal 31, and the nut 236 is tightened onto the threaded portion of the bolt 238, thereby fastening the first connecting metal 31 and the flange member 237, which is the second connecting metal. As a result, the wooden beam 10 is supported from above by the structure 220 via the connecting member 230, as in the third embodiment.

In this modified example, the structure 220 is made of steel reinforced concrete, so its surface is uneven compared to steel plate, but the flat surface of the flange portion 237a of the flange member 237 is exposed on the underside of the structure 220, which is the joint surface with the first joint metal 31. This ensures surface contact between the structure 220 and the wooden beam 10, and as a result, the structure 220 can stably support the wooden beam 10.

In the above modified example, the threaded portion of the bolt 238 protruding from the structure 220 is fastened to the nut 236 provided on the first connecting metal 31 side. Alternatively, a cap nut may be welded and fixed to the upper surface of the flange portion 237a, and the cap nut may be fastened to the bolt provided on the first connecting metal 31 side.

In the third embodiment, the steel-reinforced concrete structure 220 is configured as a beam. Alternatively, the steel-reinforced concrete structure 220 may be configured as part of a partition wall on the upper floor.

Although the embodiments of the present invention have been described above, the above embodiments merely show some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

<Reference Example>
Next, a reference example will be described with reference to Fig. 10. Below, differences from the first embodiment will be mainly described, and descriptions of configurations that are the same as or equivalent to those described in the first embodiment will be omitted.

The beam support structure 400 of this reference example differs from the beam support structure 100 of the first embodiment described above in that the structure 320 is a wooden beam. Note that FIG. 10 is a cross-sectional view showing a cross section corresponding to FIG. 3.

As shown in FIG. 10, the beam support structure 400 includes a wooden beam 10 that is spanned between columns (not shown) or between beams (not shown), a structure 320 that is spanned perpendicular to the wooden beam 10, and a joining member 330 that joins the wooden beam 10 and the structure 320 at the intersection of the wooden beam 10 and the structure 320. Note that the wooden beam 10 has the same configuration as in the first embodiment, so a description thereof will be omitted.

The structure 320 is a wooden beam that is suspended above multiple wooden beams 10, and like the wooden beams 10, is made of solid wood or laminated wood.

In this reference example, the joining members joining the wooden beam 10 and the structure 320 include a first joining metal piece 31 embedded in the wooden beam 10, a bolt 335 provided in the structure 320, and a nut 336 screwed onto the bolt 335.

The first connecting metal fitting 31 has the same configuration as in the first embodiment described above, so its description will be omitted.

In the structure 320, an insertion hole 323 through which the bolt 335 is inserted is formed along the beam direction, and a storage groove 322 is formed to store the head of the bolt 335. For example, two insertion holes 323 are provided along the beam width direction of the structure 320. The storage groove 322 is a groove formed along the beam width direction of the structure 320, and two insertion holes 323 open on its bottom surface.

The bolt 335, which is inserted through the insertion hole 323 formed in the structure 320, is inserted through the insertion hole 33a formed in the flange portion 33 of the first joint metal 31, and the nut 336 is tightened onto the bolt 335, so that the wooden beam 10 is supported from above by the structure 320, as in the first embodiment.

In order to transmit the axial force of the bolt 335 evenly to the wooden beam, i.e., the structure 320, it is preferable to interpose a metal plate 337 between the bottom surface of the accommodation groove 322 and the head of the bolt 335. In addition, in order to protect the head of the bolt 335, it is preferable to provide a wooden cover material 325 that covers the opening of the accommodation groove 322.

In this reference example, the structure 320 is a wooden beam, and does not include either steel or reinforced concrete as shown in the first to third embodiments. For this reason, the structure 320 may bend over time, just like the wooden beam 10 supported by the structure 320, and it is difficult to achieve the same effect as the first to third embodiments. However, even if the structure 320 is made of solid wood or laminated timber, it is possible to achieve the same effect if its rigidity is sufficiently higher than that of the wooden beam 10, and preferably is equivalent to that of the structures in the above embodiments that include either steel or reinforced concrete.

100, 200, 300... Beam support structure 1... Space 10, 110... Wooden beam 20, 120, 220... Structural body 22... Lower flange (second joint metal)
30, 130, 230... Joining member 31... First joining metal member 32... Plate portion 33... Flange portion 35... Bolt (fastening member)
36, 136, 236...Nut (fastening member)
122: Buried plate (second joint metal)
135: Anchor bolt 135a: Hook portion (second connecting metal part)
135b... Male thread portion (fastening member)
137...Bolt (joint member)
138...Long nut (joint member)
221...H-shaped steel material (second connecting metal)
235... Cut bolt (fastening member)
237...Flange member (second connecting metal member)
238...Bolt (fastening member)
G1...Gap

Claims (6)

A beam support structure for supporting a wooden beam,
At least one wooden beam spanning between the columns or beams;
A structure that spans the wooden beam perpendicularly;
A joining member that joins the wooden beam and the structure at a point where the wooden beam and the structure intersect,
The structure includes at least one of a steel frame and reinforced concrete, and is spanned above the wooden beam.
Beam-supported structure. The joint member has a first joint metal embedded in the wooden beam,
The first metal joint is
A plate portion to be inserted into the wooden beam;
A flange portion extending from the plate portion in the beam width direction of the wooden beam and facing the structure.
The beam support structure of claim 1 . The joining member is
A second metal joint provided on the structure;
and a fastening member for fastening the first metal joint and the second metal joint in the vertical direction.
The beam support structure of claim 2 . The wooden beam is joined to the structure via the joining member, so that the portion joined to the structure is warped upward relative to the beam end of the wooden beam.
A beam support structure according to any one of claims 1 to 3. A beam support method for supporting a wooden beam, comprising:
A step of bridging the wooden beam between pillars or beams;
A step of bridging a structure including at least one of a steel frame and reinforced concrete above the wooden beam so as to be perpendicular to the wooden beam;
and joining the wooden beam to the structure by a joining member at a location where the wooden beam and the structure intersect.
Beam support method. The structure is bridged above the wooden beam with a predetermined gap between the structure and the wooden beam,
The wooden beam is joined to the structure in a state where it is warped upward by the joining member so that the predetermined gap at the joint with the structure is narrowed.
The beam support method according to claim 5.

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