JP2022135463A - Beam support structure and beam support method - Google Patents

Abstract

To restraint deflection of a wooden beam.SOLUTION: A beam support structure 100 comprises wooden beams 10 bridged between columns or between beams, a structure 20 bridged so as to be orthogonal to the wooden beams 10, and joining members 30 for joining the wooden beams 10 and the structure 20 at the place where the wooden beams 10 and the structure 20 intersect. The structure 20 includes one of a steel frame and reinforced-concrete and is bridged above the wooden beams 10.SELECTED DRAWING: Figure 2

Description

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

Patent Literature 1 discloses a structure in which wooden beams are bridged between pillars.

JP 2020-133356 A

2. Description of the Related Art In recent years, from the viewpoint of greenhouse gas reduction, active use of wood that captures and fixes carbon dioxide as a building material has been promoted. In addition, in a building provided with wooden beams as described in Patent Document 1, the wooden beams are exposed to the inside of the room to provide an exposed finish, thereby improving the aesthetic appearance of the living room space.

On the other hand, wood is unsuitable for relatively long-span beams used to form large spaces, such as halls, because it causes a phenomenon (creep) that gradually increases in deflection over time. . In order to suppress the occurrence of deflection, it is conceivable to increase the beam length of the wooden beams, but the increase in material costs increases the construction cost, and the downward protrusion of the beams creates a feeling of oppression. There is a risk.

An object of the present invention is to provide a beam support structure capable of suppressing deflection of wooden beams.

The present invention provides a beam support structure for supporting wooden beams, comprising: at least one wooden beam spanned between columns or between beams; a structure spanned perpendicular to the wooden beam; a joint member that joins the wooden beam and the structure at a location where the beam and the structure intersect, wherein the structure includes at least one of a steel frame and reinforced concrete, and is located above the wooden beam. bridged over.

The present invention also provides a beam supporting method for supporting a wooden beam, comprising the steps of: bridging the wooden beam between columns or between beams; and joining the wooden beam to the structure with a joining member at the intersection of the wooden beam and the structure.

According to the present invention, bending of wooden beams can be suppressed.

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. FIG. 2 is a cross-sectional view of the beam support structure according to the first embodiment of the present invention, showing a cross section taken along line AA of FIG. 1; 3 is an enlarged cross-sectional view showing an enlarged cross-section taken along line BB of FIG. 2; FIG. FIG. 3 is a view for explaining the beam supporting method according to the first embodiment of the present invention, and is a view showing a cross section corresponding to FIG. 2; It is a figure which shows the modification of the beam support structure which concerns on 1st Embodiment of this invention. FIG. 4 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; FIG. 3 is a cross-sectional view of a modified example of the beam support structure according to the second embodiment of the present invention, and shows a cross section corresponding to FIG. 2 ; FIG. 4 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. 3; FIG. 4 is a cross-sectional view of a modified example of the beam support structure according to the third embodiment of the present invention, and shows a cross section corresponding to FIG. 3 ; FIG. 4 is a cross-sectional view of a reference example of a beam support structure, showing a cross section corresponding to FIG. 3;

A beam support structure and a beam support method according to embodiments of the present invention will be described below with reference to the drawings.

<First embodiment>
A beam support structure 100 according to the first embodiment will be described with reference to FIGS. The beam support structure 100 supports the wooden beams spanned between columns or beams, and as shown in FIG. 1, supports the wooden beams 10 spanned over the space 1 from above. FIG. 1 is an image diagram (single-point perspective view) of a space 1 constructed using a beam support structure 100 according to the first embodiment.

A space 1 shown in FIG. 1 is a space with a relatively wide span such as a hall or an auditorium, and a plurality of beams span the ceiling.

In recent years, when constructing such a relatively large space 1 where many people 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. By bridging the space 1, the texture of the space 1 is improved and the old-fashioned calm space 1 is produced.

On the other hand, since the wooden beam 10 causes a phenomenon (creep) in which the deflection gradually increases with the passage of time, it is used as a long-span beam material used to form a relatively large space 1 such as a hall or auditorium. It is unsuitable as

In order to suppress such deflection, it is conceivable to increase the beam height, which is the height of the wooden beams 10 in the load direction, or to support the plurality of wooden beams 10 from below with members having high rigidity. However, in either case, there is a possibility that a feeling of oppression may be caused by the downward projection, and construction costs may increase due to increased material costs.

In order to solve such a problem, in the first embodiment, the wooden beam 10 is supported from above by a structure 20 made of a steel frame, thereby suppressing the bending of the wooden beam 10. .

Next, a specific configuration of the beam support structure 100 will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 shows a cross section of the wooden beam 10 and the structure 20 along line AA in FIG. 1 (line AA in FIG. 3), and FIG. 3 shows a cross section along line BB in FIG. It shows a cross section.

As shown in FIGS. 2 and 3, the beam support structure 100 includes a plurality of wooden beams 10 spanned between columns (not shown) or beams (not shown), and a structure spanned across the wooden beams 10 at right angles. 20, and a joint member 30 for joining the wooden beam 10 and the structural body 20 at the intersection of the wooden beam 10 and the structural body 20. - 特許庁

The wooden beams 10 are rectangular timbers made of solid wood or laminated lumber, and their surfaces are subjected to flame-retardant treatment. A groove 11 having a predetermined depth is formed in the upper surface of the wooden beam 10 facing the structural body 20 along the extending direction of the structural body 20 , that is, along the beam width direction of the wooden beam 10 . Further, the wooden beam 10 is provided with a concave portion 12 formed by hollowing out a predetermined depth from the groove portion 11 along the beam forming direction. Note that the wooden beam 10 does not have to be flame-retardant.

The structure 20 is an H-shaped steel material (steel beam) having a pair of flange portions 21 and 22 and a web portion 23 sandwiched between the pair of flange portions 21 and 22 . The structural body 20 is spanned over a plurality of wooden beams 10 such that the direction of the strong axis extends along the vertical direction, and the ends thereof are joined to columns or beams (not shown). The structure 20 shown in FIG. 1 is a single H-shaped steel member that intersects the wooden beam 10 at approximately the center of the wooden beam 10 in the material axial direction, but the number of the structures 20 is limited to one. Alternatively, a plurality of the wooden beams 10 may be provided at predetermined intervals in the axial direction of the wooden beams 10 .

Of the pair of flange portions 21 and 22, the lower flange 22 facing the upper surface of the wooden beam 10 also serves as a second joint metal fitting of the joint member 30 that joins the wooden beam 10 and the structure 20. The flange 22 is formed with an insertion hole 22a through which a bolt 35 as a fastening member is inserted.

Further, the structure 20 is provided with a rib plate 24 welded and fixed across the web portion 23 and the lower flange 22 for reinforcement.

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

The first joint hardware 31 includes a plate-like plate portion 32 inserted into the recess 12 of the wooden beam 10 and a plate-like flange portion 33 extending from the upper end of the plate portion 32 in the beam width direction of the wooden beam 10. and is a steel member having a T shape in the cross-sectional view shown in FIG. 2 .

The plate portion 32 is provided with a plurality of through holes 32a penetrating in the plate thickness direction. The wooden beam 10 is also provided with a through hole 13 penetrating in the beam width direction at a location corresponding to the through hole 32a. These through holes 13 and 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, by inserting the drift pin 37 into each of the through holes 13 and 32a in a state where the plate portion 32 is inserted into the concave portion 12 of the wooden beam 10, the first joint hardware 31 is fixed to the wooden beam 10. state.

The width of the flange portion 33 in the axial direction of the wooden beam 10 is set slightly smaller than the width of the groove portion 11 formed in the wooden beam 10, as shown in FIG. 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 hardware 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 substantially flush with the upper surface of the wooden beam 10 .

Further, the flange portion 33 is formed with insertion holes 33 a through which the bolts 35 are inserted at locations corresponding to the insertion holes 22 a formed in the lower flange 22 .

The bolts 35 are inserted through the insertion holes 22a and 33a formed in the lower flange 22 and the flange portion 33 in this way, and by tightening the bolts 35 and nuts 36, the first joint metal fitting 31 and the lower flange are connected. 22 is concluded. As a result, the wooden beam 10 is supported from above by the structure 20 via the joint member 30 .

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

First, as shown in FIG. 4 , a plurality of wooden beams 10 to which the first joint metal fittings 31 are attached are respectively spanned between columns or between beams (not shown), and then the structure 20 having the above-described configuration is formed on the wooden beams 10 . bridged upwards. Either the wooden beam 10 or the structure 20 may be laid over first.

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 a state in which the wooden beam 10 and the structure 20 are bridged together. A predetermined gap G1 having a size of several millimeters to several tens of millimeters is provided therebetween. In other words, the structural body 20 is bridged over the wooden beam 10 in a state of being offset upward from the wooden beam 10 so as not to touch the wooden beam 10 .

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

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 placed on the deck plate to form the upper floor. A slab is constructed. Once the upper floor slab is constructed, the structural body 20 composed of the inorganic steel beams cannot be seen from below, so that the warm texture of the wooden beams 10 can be emphasized.

Here, by providing the predetermined gap G1 as described above in advance, in the process of tightening the bolt 35 and the nut 36, the wooden beam 10 having lower rigidity than the structural body 20 composed of the steel frame can be used as the structural body. It displaces upward toward the structure 20 side little by little so that the predetermined gap G1 at the joint with 20 is gradually narrowed. That is, the wooden beam 10 is joined to the structural body 20 via the joint member 30, so that the height from the floor surface at the jointed portion to the structural body 20 is higher than the height at both ends. That is, it is in a state of being warped upward at the portion where it is joined to the structure 20 .

Since the wooden beam 10 is supported by the structure 20 in an upwardly warped state, it is possible to reliably prevent the wooden beam 10 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 beam material exceeding 10 m, and as a result, it is also possible to improve the aesthetics of a relatively large space 1 such as a hall or auditorium. becomes.

Note that the predetermined gap G1 is not necessarily required, and even if the above-described predetermined gap G1 is not provided, the wooden beam 10 will be supported from above by the highly rigid structure 20. Therefore, it is possible to sufficiently suppress bending of the wooden beam 10 over time.

In addition, since the structural body 20 is arranged above the wooden beam 10, the portion where the structural body 20 is provided protrudes upward. For this reason, when a space such as a living room is provided on the upper floor, it is preferable to arrange the portion where the structural body 20 protrudes inside the partition wall of the living room. If the upper floor is a non-living room space such as a rooftop or a machine room, the structural body 20 may be exposed as it is.

According to the first embodiment described above, the following effects are obtained.

In the beam support structure 100 configured as described above, the wooden beams 10 spanned between columns or beams are supported from above by a structural body 20 made of a steel frame having higher rigidity than the wooden beams 10 . Therefore, it is possible to prevent the wooden beam 10 from bending downward over time.

By suppressing the bending 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 that require beams with relatively long spans. , the texture of a relatively large space 1 such as a hall or auditorium can be improved.

In addition, since the structure 20 supporting the wooden beams 10 is arranged above the wooden beams 10, it is possible to avoid the feeling of oppression, and the feeling of spaciousness of the space 1 can be maintained. becomes less visible, the beauty of the space 1 can be improved.

In addition, by using a steel frame that has high rigidity and is relatively inexpensive as the structure 20 that supports the wooden beams 10, a single structure 20 can stably support a plurality of wooden beams 10, and construction costs are reduced. can be reduced.

In addition, by setting the joining direction of the wooden beam 10 and the structural body 20 by the joining member 30 to the vertical direction, it is possible to reliably prevent the wooden beam 10 from being bent and improve the workability of the joining work. can be made

In addition, the flange portion 33 of the first joint metal fitting 31 is housed in the groove portion 11 formed in the wooden beam 10 so that the upper surface of the flange portion 33 and the upper surface of the wooden beam 10 are flush with each other, and the first joint metal fitting 31 and the wooden beam are arranged. 10 and 10 are integrally and simply configured, the appearance can be improved without impairing the beauty given by the wooden beam 10.例文帳に追加

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

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

The extension flange 26 is a plate-like member having the same thickness as the lower flange 22 and is arranged to face the flange portion 33 of the first joint metal fitting 31 . Further, the extension flange 26 is formed with an insertion hole 26 a through which the bolt 35 is inserted at a location corresponding to the insertion hole 33 a formed in the flange portion 33 .

In addition, the structure 20 of this modification includes a first rib plate 27 welded and fixed across the upper flange 21, the lower flange 22, the web portion 23, and the extension flange 26, and the first rib plate 27 with the web portion 23 interposed therebetween. A second rib plate 28 positioned opposite the rib plate 27 is provided to reinforce the junction of the lower flange 22 and the extension flange 26 .

In this modification, the extension flange 26 provided on the structure 20 and the flange portion 33 of the first joint metal fitting 31 are fastened in the vertical direction by means of bolts 35 and nuts 36, so that the wooden beam 10 is constructed as described above. As with one embodiment, it will be supported by structure 20 .

Thus, in the modification shown in FIG. 5, the insertion hole 26a through which the bolt 35 is inserted is provided in the extended flange 26 instead of the lower flange 22. As shown in FIG. Therefore, it is possible to maintain the rigidity of the structure 20 without processing a through-hole in the H-shaped steel material that is the structure 20 . Therefore, it is useful, for example, when a beam such as a large beam that requires high rigidity 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 joint metal 31 and the lower flange 22 as the second joint metal. Alternatively, any fastening member may be used as long as it can be fastened in the vertical direction. A combination of a bolt (full thread) and a nut, or a combination of a threaded bolt welded to the upper surface of the flange portion 33 of the first joint metal fitting 31 and a nut may be used.

In the first embodiment, the flange portion 33 of the first joint metal fitting 31 is accommodated in the groove portion 11 formed in the wooden beam 10, and the upper surface of the flange portion 33 is substantially flush with the upper surface of the wooden beam 10. ing. Alternatively, the groove 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 in a state where the first joint hardware 31 is attached to the wooden beam 10.

Further, in the first embodiment, the predetermined gap G1 is formed by bridging the wooden beam 10 with the structural body 20 offset upward. Instead of this, the wooden beam 10 and the structural body 20 are bridged over the wooden beam 10 with the structural body 20 that has been warped in advance. A gap may be formed between

Further, in the above-described first embodiment, a plurality of wooden beams 10 are supported by the structure 20, but the number of wooden beams 10 to be supported may be only one.

<Second embodiment>
Next, a beam support structure 200 according to a second embodiment of the invention will be described with reference to FIG. In the following, differences from the first embodiment will be mainly described, and descriptions of the same or corresponding configurations as 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 above-described first embodiment in that the structure 120 is made of reinforced concrete. 6 is a cross-sectional view showing a cross section corresponding to FIG.

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

The structure 120 is a beam of reinforced concrete cast on site so as to span over the plurality of wooden beams 10, and its ends are joined to columns or beams (not shown). Note that the structure 120 may be a precast material that is manufactured in advance at a factory.

The joint member 130 includes a first joint metal 31 embedded in the wooden beam 10, second joint metal 122, 135a embedded in the structure 120, and the first joint 31 and the second joint 122, 135a. It is composed of a male screw portion 135b and a nut 136 (fastening member) to be fastened.

Since the first joint metal fitting 31 has the same configuration as that of the first embodiment, the description thereof will be omitted.

The second joint metal fittings 122 and 135a are composed of a flat embedded plate 122 and a hook portion 135a of an anchor bolt 135 with a U-shaped hook welded to the embedded plate 122 .

The embedded plate 122 is formed with an insertion hole 122a through which the male threaded portion 135b of the anchor bolt 135 is inserted. The embedding plate 122 and the anchor bolt 135 are integrated by welding the anchor bolt 135 to the embedding plate 122 while the male threaded portion 135b of the anchor bolt 135 is inserted through the insertion hole 122a.

With the second joint metal fittings 122 and 135a configured in this way, when the structure 120 is driven, the plane from which the male threaded portion 135b of the anchor bolt 135 protrudes out of the two planes of the embedded plate 122 is embedded so that it is flush with the bottom surface of the

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

By inserting the male screw portion 135b protruding from the structure 120 in this way into the insertion hole 33a formed in the flange portion 33 of the first joint metal fitting 31 and tightening the nut 136 on the male screw portion 135b, the first joint metal fitting 31 and the second joint metal fittings 122, 135a are fastened. As a result, the wooden beam 10 is supported from above by the structure 120 via the joint member 130, as in the first embodiment.

As in the first embodiment, a deck plate (not shown) may be laid above the wooden beams 10, and concrete may be placed on the deck plate to construct the upper floor slab.

According to the second embodiment described above, the following effects are obtained.

In the beam support structure 200 configured as described above, the wooden beams 10 spanned between columns or beams are supported from above by a structure 120 made of reinforced concrete having higher rigidity than the wooden beams 10 . Therefore, as in the first embodiment, it is possible to prevent the wooden beams 10 from bending downward over time, so that the same effects as in the first embodiment can be obtained.

Moreover, since the structural body 120 of the beam support structure 200 having the above configuration is made of reinforced concrete, the surface of the structural body 120 is uneven compared to a steel plate. Therefore, the surface of structure 120 is not suitable as a joint surface with other members. However, in the beam support structure 200 configured as described above, the plane of the embedded plate 122 is exposed on the lower surface of the structure 120 which is the joint surface with the first joint metal fitting 31 . Therefore, surface contact between the structure 120 and the wooden beam 10 is ensured, and as a result, the wooden beam 10 can be stably supported by the structure 120 .

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

In the second embodiment, the embedding plate 122 and the hook portion 135a of the anchor bolt 135 are embedded in the structure 120 as the second joint hardware. Alternatively, only the hook portion 135 a of the anchor bolt 135 may be embedded in the structure 120 as the second joint metal without providing the embedded plate 122 . In addition, it is preferable to provide the embedded plate 122 in order to accurately match the interval at which the male screw portion 135b is provided with the interval at which the insertion hole 33a is provided.

Further, 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 capable of functioning as a retainer. It may be formed in a brim shape like a part.

Further, in the second embodiment, the hook portion 135a as the second joint metal and the male thread portion 135b as the fastening member are integrally formed as the anchor bolt 135. As shown in FIG. Alternatively, the hook portion 135a and the externally threaded portion 135b may be separate members. In this case, the hook portion 135a is welded and fixed to one surface of the embedded plate 122 by a U-shaped or L-shaped member. The male threaded portion 135b is configured by welding and fixing a threaded bolt (full thread) to the other surface of the embedded plate 122. As shown in FIG.

Further, in the second embodiment, the structure 120 is provided with the male screw portion 135b. Alternatively, as in the modification shown in FIG. 7, the structure 120 may be provided with internal threads. 7 is a cross-sectional view showing a cross section corresponding to FIG.

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

The wooden beam 110 is formed with an insertion hole 113 through which the bolt 137 is inserted along the beam-forming direction, and an accommodation groove 112 for accommodating the head of the bolt 137 is formed. Two or more insertion holes 113 are provided in the axial direction of the wooden beam 110 , that is, in the beam width direction of the structure 120 . The accommodation groove 112 is a groove formed along the material axis direction of the wooden beam 110, and a plurality of insertion holes 113 are opened in the bottom surface thereof.

The long nut 138 is a cap nut having an inner peripheral surface formed with a female thread, and an outer peripheral surface provided with a plurality of protrusions (not shown) that function as retainers.

By tightening a bolt 137 inserted through an insertion hole 113 formed in the wooden beam 110 against a long nut 138 embedded in the structure 120, the wooden beam 110 can be formed into a reinforced concrete structure as in the second embodiment. It will be in a state where it is supported from above by the structure 120 of the structure.

In order to evenly transmit the axial force of the plurality of bolts 137 to the wooden beam 110, one metal plate 139 should be interposed between the bottom surface of the housing groove 112 and the heads of the plurality of bolts 137. is preferred. Further, in order to prevent deformation or damage of the wooden beam 110 due to the axial force of the bolt 137, the insertion hole 113 may be provided with a metal sleeve. Moreover, in order to prevent the head of the bolt 137 from being seen from below the wooden beam 110, it is preferable to provide a wooden cover member 115 for closing the opening of the accommodation groove 112. As shown in FIG.

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

<Third Embodiment>
Next, a beam support structure 300 according to a third embodiment of the invention will be described with reference to FIG. In the following, differences from the first embodiment will be mainly described, and descriptions of the same or corresponding configurations as 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 above-described first embodiment in that the structure 220 is steel-reinforced concrete. 8 is a cross-sectional view showing a cross section corresponding to FIG.

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

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

The structure 220 includes an H-shaped steel member 221 (steel frame beam) having a pair of flange portions 222 and 223 and a web portion 224 sandwiched between the pair of flange portions 222 and 223. It is embedded in the structure 220 with its axial direction along the vertical direction.

The H-shaped steel member 221 also serves as a second joint metal fitting of the joint member 230 that joins the wooden beam 10 and the structure 220, and is the lower side of the pair of flange portions 222 and 223 facing the upper surface of the wooden beam 10. A threaded bolt 235 (fully threaded) as a fastening member is welded and fixed to the lower surface of the flange 223 .

The joining member 230 includes a first joining metal fitting 31 embedded in the wooden beam 10, an H-shaped steel material 221 (second joining metal fitting) embedded in the structure 220, and the first joining metal fitting 31 and the H-shaped steel material 221. It is composed of a threaded bolt 235 and a nut 236 (fastening member) to be fastened.

Since the first joint metal fitting 31 has the same configuration as that of the first embodiment, the description thereof will be omitted.

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 by a predetermined length when the structure 220 is driven.

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

By inserting the cut bolt 235 protruding from the structure 220 into the insertion hole 33a formed in the flange portion 33 of the first joint metal fitting 31 and tightening the nut 236 on the cut bolt 235, the first The joining hardware 31 and the H-shaped steel material 221 are fastened. As a result, the wooden beam 10 is supported from above by the structure 220 via the joint member 230, as in the first embodiment.

As in the first embodiment, a deck plate (not shown) may be laid above the wooden beams 10, and concrete may be placed on the deck plate to construct the upper floor slab.

According to the third embodiment described above, the following effects are obtained.

In the beam support structure 300 configured as described above, the wooden beams 10 spanned between columns or beams are supported from above by a structure 220 made of steel-reinforced concrete having higher rigidity than the wooden beams 10 . Therefore, as in the first embodiment, it is possible to prevent the wooden beams 10 from bending downward over time, so that the same effects as in the first embodiment can be obtained.

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

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

The flange member 237 is a steel member having a flange portion 237a provided parallel to the lower flange 223 of the H-shaped steel member 221 and an extension portion 237b extending 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.

The flange member 237 is formed, for example, by cutting a commercially available H-shaped steel material, and has a length equivalent to the length of the flange portion 33 of the first joint metal fitting 31 in the beam width direction of the wooden beam 10 . The flange portion 237 a of the flange member 237 is formed with insertion holes 237 c through which the bolts 238 are inserted, corresponding to the insertion holes 33 a formed in the flange portion 33 of the first joint metal fitting 31 . The bolt 238 inserted through the insertion hole 237c is preliminarily welded and fixed to the flange portion 237a in a state in which the threaded portion protrudes in the direction opposite to the extending portion 237b.

The flange member 237 configured in this manner is integrated with the H-section steel material 221 by welding the extending portion 237b to the lower flange 223 of the H-section 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 lower surface of the structure 220 when the structure 220 is driven. be

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

By inserting the threaded portion of the bolt 238 protruding from the structure 220 in this way into the insertion hole 33a formed in the flange portion 33 of the first joint metal fitting 31 and tightening the nut 236 on the threaded portion of the bolt 238, The first joint metal 31 and the flange member 237, which is the second joint metal, are fastened. As a result, the wooden beam 10 is supported from above by the structure 220 via the joint member 230, as in the third embodiment.

In this modification, since the structure 220 is made of steel reinforced concrete, the surface of the structure 220 is more uneven than the steel plate. A plane of the flange portion 237a of the flange member 237 is exposed on the lower surface. Therefore, surface contact between the structure 220 and the wooden beam 10 is ensured, and as a result, the wooden beam 10 can be stably supported by the structure 220 .

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

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

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments. do not have.

<Reference example>
Next, a reference example will be described with reference to FIG. In the following, differences from the first embodiment will be mainly described, and descriptions of the same or corresponding configurations as 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 according to the above-described first embodiment in that the structures 320 are wooden beams. 10 is a cross-sectional view showing a cross section corresponding to FIG.

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

The structure 320 is a wooden beam that spans over the plurality of wooden beams 10 and is made of solid wood or laminated wood, like the wooden beams 10 .

In this reference example, as joining members for joining the wooden beam 10 and the structural body 320, a first joint fitting 31 embedded in the wooden beam 10, a bolt 335 provided inside the structural body 320, and a bolt 335 screwed into the bolt 335 A nut 336 is provided.

Since the first joint metal fitting 31 has the same configuration as that of the first embodiment, the description thereof will be omitted.

The structure 320 is formed with an insertion hole 323 through which the bolt 335 is inserted along the beam-forming direction, and an accommodation groove 322 for accommodating the head of the bolt 335 . Two insertion holes 323 are provided along the beam width direction of the structure 320, for example. The accommodation groove 322 is a groove formed along the beam width direction of the structure 320, and two insertion holes 323 are opened in the bottom surface thereof.

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

In order to evenly transmit the axial force of the bolt 335 to the structure 320 which is a wooden beam, one metal plate 337 should be interposed between the bottom surface of the housing groove 322 and the head of the bolt 335. is preferred. Moreover, in order to protect the head of the bolt 335, it is preferable to provide a wooden cover member 325 for closing the opening of the accommodation groove 322. As shown in FIG.

In this reference example, the structure 320 is a wooden beam, and does not include either a steel frame or reinforced concrete as shown in the first to third embodiments. For this reason, the structure 320, like the wooden beam 10 supported by the structure 320, may bend over time, and it is difficult to achieve the same effects as those of the first to third embodiments. is. However, even if the structure 320 is made of solid wood or laminated wood, its rigidity is sufficiently higher than that of the wooden beam 10, and preferably, it is the same as the structure in each of the above-described embodiments that includes either a steel frame or reinforced concrete. If the same rigidity can be obtained, the same effect can be obtained.

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

Claims (6)

A beam support structure that supports a wooden beam,
at least one wooden beam spanned between columns or beams;
a structure that spans across the wooden beams perpendicularly;
a joining member that joins the wooden beam and the structure at a location where the wooden beam and the structure intersect,
The structure includes at least one of a steel frame and reinforced concrete, and is bridged over the wooden beam.
Beam support structure. The joint member has a first joint metal embedded in the wooden beam,
The first joint metal is
a plate portion 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;
A beam support structure according to claim 1. The joining member is
a second joint metal provided on the structure;
a fastening member that fastens the first joining metal fitting and the second joining metal fitting in the vertical direction,
A beam support structure according to claim 2. The wooden beam is joined to the structure through the joining member, so that the portion joined to the structure is bent upward from 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:
bridging the wooden beam between pillars or beams;
bridging a structure including at least one of a steel frame and reinforced concrete above the wooden beam so as to be orthogonal to the wooden beam;
joining the wooden beam to the structure with a joining member at a location where the wooden beam and the structure intersect;
Beam support method. The structure is bridged over the wooden beam with a predetermined gap between the wooden beam and the wooden beam,
The wooden beam is joined to the structure while being bent upward by the joining member so that the predetermined gap at the joint to the structure is narrowed.
The beam support method according to claim 5.

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