Beam structure with reinforced beams and connecting members

Abstract

To provide a beam structure comprising a reinforcing beam and a joint member in which a joint member not compatible with a reinforcing beam having a high beam height can be used and the occurrence of collapse of a reinforcing beam can be suppressed.SOLUTION: A beam structure 1 comprises a reinforcing beam 2 and a joint member 3 to which an end portion of the reinforcing beam 2 in the longitudinal direction is joined. The reinforcing beam 2 has a beam body portion 21 and a reinforcing portion 24. The beam body portion 21 has a body web 22 and a body flange 23. The reinforcing portion 24 has a reinforcing web 25 extending downwardly from a lower body flange 232 and a reinforcing flange 26 formed at the lower end of the reinforcing web 25. A vertical length H24 of the reinforcing portion 24 is 60% or less of a vertical length H21 of the beam body portion 21. The joint member 3 has a joint web 31 and a joint flange 32. A longitudinal end of the body web 22 is joined to the joint web 31, and a longitudinal end of the body flange 23 joins or faces the joint flange 32.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a beam structure comprising a reinforcing beam and a connecting member, and more particularly to a beam structure comprising a reinforcing beam having a beam main body portion and a reinforcing portion, and a connecting member to which the longitudinal end portion of the reinforcing beam is joined. [Background technology]

[0002] A load-bearing member having multiple support members made of H-shaped steel is known (see, for example, Patent Document 1). This load-bearing member has a first support member and a second support member, each having a weld flange, a web, and an outer flange, and the weld flanges are welded together. This forms a beam member with a beam depth twice that of the support member alone. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-123484 Summary of the Invention [Problem to be solved by the invention]

[0004] The beam member disclosed in Patent Document 1 has improved rigidity as a beam, i.e., bending rigidity against bending in the direction along the surface of the web. However, when the longitudinal end of the beam member is joined to a joining member rather than being placed on another beam member, there is a problem in that a beam member with a high beam depth is difficult to share a joining member with an existing beam member with a low beam depth.

[0005] The present disclosure aims to provide a beam structure equipped with a reinforcing beam and a connecting member that can use a connecting member that is not compatible with a reinforcing beam with a high beam depth and can prevent the reinforcing beam from collapsing. [Means for solving the problem]

[0006] A beam structure according to one embodiment of the present disclosure is a beam structure including a reinforcing beam and a connecting member to which a longitudinal end of the reinforcing beam is connected. The reinforcing beam includes a beam main body and a reinforcing portion. The beam main body includes a main body web extending in the vertical direction and main body flanges formed at the upper and lower ends of the main body web. The reinforcing portion includes a reinforcing web extending downward from the lower main body flange and a reinforcing flange formed at the lower end of the reinforcing web. The vertical length of the reinforcing portion is 60% or less of the vertical length of the beam main body. The connecting member includes a connecting web and a connecting flange. The connecting web extends in the vertical direction and corresponds to the longitudinal end of the main body web. The connecting flanges are formed at the upper and lower ends of the connecting web and correspond to the longitudinal end of the main body flange. The longitudinal end of the main body web is connected to the connecting web. The longitudinal end of the main body flange is connected to or faces the connecting flange. [Effects of the Invention]

[0007] In a beam structure equipped with a reinforcing beam and a connecting member according to the present disclosure, connecting members that are not compatible with reinforcing beams with high beam depths can be used, and the occurrence of collapse of the reinforcing beam can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of a main part of a frame structure using a beam structure according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a reinforcing beam in the beam structure. [Figure 3] FIG. 3 is an exploded perspective view of a main part including beams and connecting members of the beam structure. [Figure 4] FIG. 4 is a cross-sectional view of a normal beam in the beam structure of the same. [Figure 5] FIG. 5 is a perspective view of a main part of the beam structure. [Figure 6] FIG. 6 is a perspective view of a main part of a beam structure according to the second embodiment. [Figure 7] FIG. 7 is a perspective view of a main part of a beam structure according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] <1> First embodiment Hereinafter, a beam structure including a reinforcing beam and a joining member according to a first embodiment of the present disclosure will be described with reference to FIGS.

[0010] As shown in Fig. 1, the beam structure 1 of the present disclosure constitutes a part of a frame 10, such as the framework of a prefabricated house. The frame 10 is configured, for example, by erecting first-floor columns 12 on foundation beams 11, erecting second-floor floor beams 13 on the upper ends of the first-floor columns 12 via connecting members 3, erecting second-floor columns 14 on the connecting members 3 joined to the second-floor floor beams 13, and erecting roof beams 15 on the upper ends of the second-floor columns 14 via connecting members 3. The beam structure 1 of the present disclosure can be used as a second-floor floor structure, for example, by using reinforcing beams 2 for the second-floor floor beams 13.

[0011] Moreover, in the first embodiment, the beam structure 1 (framework 10) has a bearing frame 4 that constitutes a bearing wall. The bearing frame 4 is provided with a pair of columns 41 arranged at a distance from each other and a brace member 42 arranged between the pair of columns 41, and is composed of these columns 41 and the brace member 42. The bearing frame 4 is connected to the upper side of the reinforcing beam 2 (floor beam 13) of the second floor. The bearing frame 4 is connected to the reinforcing beam 2 by welding the lower end of the column 41 to the upper surface of the main body flange 231 on the upper side of the reinforcing beam 2, but the connection may also be by bolting or the like, and the connection method is not limited. Note that such a bearing frame 4 is an optional component in the beam structure 1, and the beam structure 1 does not necessarily have to have the bearing frame 4.

[0012] The beam structure 1 includes a reinforcing beam 2 and a connecting member 3 to which an end portion of the reinforcing beam 2 in the longitudinal direction (horizontal direction) is connected.

[0013] One or more reinforcing beams 2 are provided in the beam structure 1. As shown in Fig. 2, the reinforcing beam 2 has a beam main body portion 21 and a reinforcing portion 24. The beam main body portion 21 has a main body web 22 and main body flanges 23 formed on the upper and lower ends of the main body web 22. In the first embodiment, the beam main body portion 21 is made of a so-called H-shaped steel.

[0014] In a cross section perpendicular to the longitudinal direction of the reinforcing beam 2, the main body web 22 extends vertically. An upper main body flange 231 extending horizontally is formed at the upper end of the main body web 22, and a lower main body flange 232 extending horizontally is formed at the lower end of the main body web 22. The above-mentioned load-bearing frame 4 is connected to the upper surface of the upper main body flange 231 of the reinforcing beam 2 constituting the floor beam 13 of the second floor. In the first embodiment, the vertical length H21 of the beam main body 21, i.e., the length from the upper surface of the upper main body flange 231 to the lower surface of the lower main body flange 232, is 250 mm. In the first embodiment, the widthwise length B21 of the beam main body 21, i.e., the length of the main body flange 23 in the short direction perpendicular to the longitudinal direction of the reinforcing beam 2, is 100 mm. In the first embodiment, the thickness of the main body web 22 and the main body flange 23 is 4.5 mm.

[0015] The reinforcing portion 24 has a reinforcing web 25 and a reinforcing flange 26. The reinforcing web 25 extends downward from the lower main body flange 232. Specifically, the upper end of the reinforcing web 25 is connected to the lower surface of the lower main body flange 232 by welding. Reference numeral 27 in the drawing denotes a fillet portion. The reinforcing web 25 is located at the same position as the main body web 22 in the width direction of the reinforced beam 2. In other words, the reinforcing web 25 is linearly continuous with the main body web 22 via the lower main body flange 232.

[0016] The reinforcing flange 26 is formed at the lower end of the reinforcing web 25. The length of the reinforcing flange 26 in the width direction is 100 mm in the first embodiment.

[0017] In the first embodiment, the vertical length H24 of the reinforcing portion 24, i.e., the length from the upper end of the reinforcing web 25 (the portion in contact with the lower surface of the lower main body flange 232) to the lower surface of the reinforcing flange 26, is 150 mm. The reinforcing portion 24 is made of so-called T-shaped steel. The widthwise length of the reinforcing portion 24 is 100 mm, the same as the widthwise length B21. In the first embodiment, the thickness of the reinforcing web 25 and the reinforcing flange 26 is 4.5 mm, the same as the thickness of the main body web 22 and the main body flange 23.

[0018] The beam depth of the reinforcing beam 2, that is, the length from the upper surface of the main body flange 231 on the upper side of the reinforcing beam 2 to the lower surface of the reinforcing flange 26, is 400 mm.

[0019] As shown in Fig. 3, the joining member 3 has a joining web 31 and a joining flange 32. The joining web 31 extends in the vertical direction, and in the first embodiment, one joining member 3 has a plurality of joining webs 31 and joining flanges 32, is cross-shaped in plan view, and has joining portions 311 to 314 at its tip. The joining portions 311 to 314 each correspond to the longitudinal ends of the main web 22. In the first embodiment, the vertical length of the joining web 31, i.e., the length from the upper end to the lower end of the joining web 31, is 250 mm, the same as that of the main web 22.

[0020] The joining flanges 32 are formed at the upper and lower ends of the joining web 31, respectively, and correspond to the longitudinal ends of the main body flange 23. Specifically, an upper joining flange 321 extending horizontally is formed at the upper end of the joining web 31, and a lower joining flange 322 extending horizontally is formed at the lower end of the joining web 31. In the first embodiment, the joining flange 32 has a square shape in a plan view, and the length of one side of the joining flange 32 is 100 mm, which is the same as the width direction length of the main body flange 23. In the first embodiment, the thickness of the joining web 31 is 4.5 mm, which is the same as that of the main body web 22, and the thickness of the joining flange 32 is 6 mm.

[0021] The joining flange 32 has connection portions 34 formed to the columns 12, 14 that are respectively connected to the lower and upper sides of the joining member 3. In the first embodiment, the connection portions 34 are bolt holes through which bolts (not shown) serving as connectors that connect the joining member 3 and the column 12 are inserted, and the joining portions 34 are formed with a total of four bolt holes, one each in the region sandwiched between the joining portions 311 and 312, the region sandwiched between the joining portions 312 and 313, the region sandwiched between the joining portions 313 and 314, and the region sandwiched between the joining portions 314 and 311.

[0022] The columns 12, 14 have a rectangular cylindrical main body portion 16 and flanges 17 formed at the upper and lower ends of the main body portion 16. In the first embodiment, the flange 17 has a square shape with a side length of 100 mm, similar to the connecting flange 32, and connecting portions 18 consisting of bolt holes are formed at positions corresponding to the connecting portions 34 of the connecting flange 32.

[0023] The lower connecting flange 322 of the connecting member 3 is placed on the upper flange 17 of the column 12 so that the connecting portion 18 formed on the upper flange 17 of the column 12 and the connecting portion 34 formed on the lower connecting flange 322 of the connecting member 3 are in communication with each other. Then, a bolt serving as a connector is inserted through the connecting portion 18 and the connecting portion 34, and the nut is tightened onto the bolt, thereby connecting the column 12 and the connecting member 3. Also, the lower flange 17 of the column 14 is placed on the upper connecting flange 321 of the connecting member 3 so that the connecting portion 34 formed on the upper connecting flange 321 of the connecting member 3 and the connecting portion 18 formed on the lower flange 17 of the column 14 are in communication with each other. Then, a bolt serving as a connector is inserted through the connecting portion 18 and the connecting portion 34, and the nut is tightened onto the bolt, thereby connecting the connecting member 3 and the column 14.

[0024] The joints 311 to 314 protrude from the joint flange 32. In other words, in a plan view, the joints 311 to 314 are located outside the joint flange 32. The joints 311 to 314 are formed with connection portions 33 each consisting of a bolt hole through which a bolt (not shown) is inserted as a connector for connecting to the beam main body 21 of the reinforcing beam 2. Furthermore, a connection portion 221 consisting of a bolt hole is formed at a position corresponding to the connection portion 33 at the end of the main body web 22 in the longitudinal direction.

[0025] As shown in FIGS. 3 and 5 , when joining a reinforcing beam 2 and a joining member 3, first, the joining portion 311 and the main body web 22 are overlapped so that the connection portion 33 formed at the joining portion 311 of the joining member 3 communicates with the connection portion 221 formed at the main body web 22 of the beam main body portion 21 of the reinforcing beam 2. At this time, the end portion of the joining flange 32 in the direction along the surface and the end portion of the main body flange 23 in the longitudinal direction are butted together. Then, bolts serving as connectors are inserted through the connection portions 33 and 221, and nuts are tightened onto the bolts to join the end portion of the main body web 22 in the longitudinal direction to the joining web 31. In the first embodiment, the end portion of the main body flange 23 in the longitudinal direction is butted against the joining flange 32 and faces the joining flange 32. Similarly, the end portion of another reinforcing beam 2 is joined to the joining portion 312 of the joining member 3. In this manner, the reinforcing beam 2 and the joining member 3 are joined together. In addition, the joint between the reinforcing beam 2 and the joint member 3 is such that the beam main body portion 21 of the reinforcing beam 2 is directly joined to the joint member 3, and the reinforcing portion 24 of the reinforcing beam 2 is not directly joined to the joint member 3.

[0026] As shown in FIG. 1, this beam structure 1 further includes a normal beam 5 having a beam main body 51 but no reinforcement portion. As shown in FIG. 4, the beam main body 51 includes a main body web 52 and main body flanges 53 (upper main body flange 531 and lower main body flange 532) formed at the upper and lower ends of the main body web 52. In the first embodiment, the beam main body 51 is made of H-shaped steel and has the same cross-sectional shape as the beam main body 21 described above. Furthermore, the longitudinal end of the main body web 52 is formed with a connection portion 521 (see FIG. 3) consisting of a bolt hole at a position corresponding to the connection portion 33. The beam depth H51 of the normal beam 5, i.e., the length from the upper surface of the upper main body flange 531 of the normal beam 5 to the lower surface of the lower main body flange 532, is 250 mm, the same as the vertical length H21 of the beam main body 21 of the reinforced beam 2. Furthermore, the widthwise length B51 of the main body flange 53 is 100 mm.

[0027] As shown in FIGS. 3 and 5 , when joining a normal beam 5 and a joining member 3, first, the joining portion 313 and the main body web 52 are overlapped so that the connection portion 33 formed at the joining portion 313 of the joining member 3 communicates with the connection portion 521 formed at the main body web 52 of the beam main body portion 51 of the normal beam 5. At this time, the longitudinal end of the joining flange 32 and the longitudinal end of the main body flange 53 are butted together. Then, bolts serving as connectors are inserted through the connection portions 33 and 521, and nuts are tightened onto the bolts to join the longitudinal end of the main body web 52 to the joining web 31. In addition, the longitudinal end of the main body flange 53 is butted against the joining flange 32 and faces it. In a similar manner, the end of another normal beam 5 is joined to the joining portion 314 of the joining member 3.

[0028] 2, in this beam structure 1, the vertical length H24 of the reinforcing portion 24 is set to be 60% or less of the vertical length H21 of the beam main body portion 21. This point will be explained below.

[0029] Beams (reinforced beams 2 and standard beams 5) are subjected to forces from load-bearing walls with load-bearing frames 4, other wall materials, floor materials, and other heavy objects. For this reason, it is preferable for beams to have high bending rigidity against vertical bending (bending in the direction along the web surface). To increase the bending rigidity of a beam, the beam depth can be increased. In this way, a reinforced beam 2 with a higher beam depth was developed compared to a standard beam 5. Because the beam depth H51 of the reinforced beam 2 is higher than the beam depth H51 of the standard beam 5, it is necessary to change the connecting member 3, which was originally designed to match the standard beam 5. However, changing the connecting member 3 is undesirable because it requires time and effort in design and development, and it increases the number of types of connecting member 3, which increases the management effort. Therefore, as described above, in the reinforced beam 2, only the portion of the beam body 21, which is the same as the standard beam 5 (beam body 51), is connected to the existing connecting member 3. This eliminates the need for designing and developing new connecting members 3, saving the time and effort required for these, and also reduces the management effort required because the number of types of connecting members 3 is not increased.

[0030] Furthermore, in the reinforced beam 2, the longer the vertical length H24 of the reinforcing portion 24 is, and the higher the beam depth of the reinforced beam 2 is, the higher the bending rigidity against vertical bending becomes. However, the longer the vertical length H24 of the reinforcing portion 24 is, the more likely another problem occurs. This is the problem of the reinforcing portion 24 of the reinforced beam 2 that is not joined to the joining member 3 collapsing.

[0031] When a downward force from various heavy objects is applied to the intermediate portion of the reinforcing beam 2 in the longitudinal direction, a bending moment is applied to the reinforcing beam 2 such that the longitudinal length of the reinforcing portion 24 becomes longer relative to the longitudinal length of the beam main body 21. In this case, the reinforcing portion 24 is extended, and therefore does not collapse. However, depending on the force applied from the load-bearing frame 4 connected to the reinforcing beam 2 or the force applied due to an earthquake, an upward force is applied to the intermediate portion of the reinforcing beam 2 in the longitudinal direction. In this case, a bending moment is applied to the reinforcing beam 2 such that the longitudinal length of the reinforcing portion 24 becomes shorter relative to the longitudinal length of the beam main body 21. In this case, the reinforcing portion 24 is subjected to a compressive force in the longitudinal direction, and collapse occurs by bending laterally (perpendicular to the side surface of the main body web 22).

[0032] If the reinforcing portion 24 collapses, it becomes difficult for the reinforcing portion 24 to increase the bending rigidity of the reinforced beam 2, resulting in a decrease in the bending rigidity of the reinforced beam 2. The longer the vertical length H24 of the reinforcing portion 24, the more likely the reinforcing portion 24 will collapse. Therefore, in order to increase the bending rigidity of the reinforced beam 2 while making the reinforcing portion 24 less likely to collapse, the vertical length H24 of the reinforcing portion 24 is set to be 60% or less of the vertical length H21 of the beam main body 21. In the first embodiment, the lower limit of the vertical length H24 of the reinforcing portion 24 is 5% of the vertical length H21 of the beam main body 21. In other words, the vertical length H24 of the reinforcing portion 24 is 5% or more and 60% or less of the vertical length H21 of the beam main body 21.

[0033] As described above, by making the vertical length H24 of the reinforcing portion 24 60% or less of the vertical length H21 of the beam main body portion 21, in a reinforcing beam 2 having a reinforcing portion 24 that is not joined to the joining member 3, the reinforcing portion 24 is less likely to collapse, and the decrease in bending rigidity of the reinforcing beam 2 due to the collapse of the reinforcing portion 24 can be suppressed.

[0034] In the first embodiment, the load-bearing frame 4 is connected to the upper main body flange 231 of the reinforcing beam 2. In this case, the load-bearing frame 4 does not need to be directly connected to the reinforcing portion 24, so the reinforcing portion 24 is not subject to any particular constraints and can be formed on the beam main body 21 over the entire longitudinal length of the beam main body 21. This makes it easier to increase the bending rigidity of the reinforcing beam 2.

[0035] Furthermore, since the existing joint members 3 that can also be joined to normal beams 5 are used, the reinforced beams 2 can be used only in the necessary areas, which makes design and construction easier and also helps reduce costs.

[0036] <2> Second embodiment Next, a beam structure 1 according to a second embodiment will be described with reference to Fig. 6. The beam structure 1 according to the second embodiment is mostly the same as the beam structure 1 according to the first embodiment. Therefore, the description overlapping with the first embodiment will be omitted.

[0037] The beam structure 1 further includes a horizontal stiffening beam 6. The horizontal stiffening beam 6 is configured of an H-shaped steel having a stiffening web 61 and a stiffening flange 62. The stiffening web 61 extends horizontally, and has a connection part (not shown) at its longitudinal tip, which is made up of a bolt hole similar to the connection part 221 of the main body web 22.

[0038] The stiffening flanges 62 are formed at the upper and lower end portions of the stiffening web 61, respectively, and correspond to the longitudinal side surfaces of the main body flange 23. Specifically, an upper stiffening flange 621 extending horizontally is formed at the upper end portion of the stiffening web 61, and a lower stiffening flange 622 extending horizontally is formed at the lower end portion of the stiffening web 61. The width direction length of the stiffening flange 62 is 100 mm, which is the same as the width direction length of the main body flange 23. The thickness of the stiffening web 61 is 2.8 to 4.5 mm, and the thickness of the stiffening flange 62 is 3.2 to 12 mm.

[0039] The vertical length of the horizontal stiffening beam 6, i.e., the length from the top surface of the upper stiffening flange 621 to the bottom surface of the lower stiffening flange 622, is 250 mm, the same as the vertical length H21 of the beam main body 21. The shape of the horizontal stiffening beam 6 in a cross section perpendicular to its longitudinal direction is the same as the shape of the normal beam 5 in a cross section perpendicular to its longitudinal direction.

[0040] A connecting piece 222 is connected to the side of the main body web 22 by welding. The connecting piece 222 corresponds to the longitudinal end of the stiffening web 61. The vertical length of the connecting piece 222 is 250 mm, the same as that of the main body web 22. The thickness of the connecting piece 222 is 4.5 mm, the same as that of the main body web 22.

[0041] The connection piece 222 protrudes from the main body flange 23. In other words, in a plan view, the end of the connection piece 222 is located outside the main body flange 23. The connection piece 222 is formed with a connection portion 223 consisting of a bolt hole through which a bolt (not shown) serving as a connector for connecting to the beam main body portion 21 is inserted.

[0042] The longitudinal ends of the horizontal stiffening beams 6 are connected to the longitudinal side surfaces of the beam main body 21 of the reinforcing beam 2. Specifically, first, the stiffening webs 61 and the connecting pieces 222 are overlapped so that the connecting portions formed on the stiffening webs 61 of the horizontal stiffening beams 6 communicate with the connecting portions 223 formed on the connecting pieces 222 of the reinforcing beams 2. At this time, the longitudinal end portions of the stiffening flanges 62 and the longitudinal side end portions of the main body flanges 23 are butted together. Then, bolts serving as connectors are inserted through the connecting portions and connecting portions 223 formed on the stiffening webs 61, and nuts are tightened onto the bolts, so that the longitudinal end portions of the stiffening webs 61 are connected to the side surfaces of the main body web 22.

[0043] A column 12 is connected to the underside of the portion of the reinforcing beam 2 to which the horizontal stiffening beam 6 is connected. The column 12 is connected to the reinforcing beam 2 by welding the upper end of the column 12 to the underside of the reinforcing flange 26 on the underside of the reinforcing beam 2, but the connection may also be by bolting or the like, and the connection method is not limited.

[0044] By connecting the horizontal stiffening beam 6 to the reinforcing beam 2, the reinforcing portion 24 is less likely to collapse, and the decrease in bending rigidity of the reinforcing beam 2 due to the collapse of the reinforcing portion 24 can be further suppressed.

[0045] Furthermore, by connecting the pillar 12 to the underside of the reinforcing beam 2, the reinforcing portion 24 is even less likely to collapse, and the reduction in the bending rigidity of the reinforcing beam 2 can be further suppressed.

[0046] <3> Third embodiment Next, a beam structure 1 according to a third embodiment will be described with reference to Fig. 7. The beam structure 1 according to the third embodiment is mostly the same as the beam structure 1 according to the first embodiment. Therefore, the description overlapping with the first embodiment will be omitted.

[0047] In the reinforced beam 2 of the first embodiment, the reinforcing portion 24 is formed over the entire longitudinal length of the beam main body 21. In contrast to this, in the reinforced beam 2 of the third embodiment, the longitudinal length of the reinforcing portion 24 is formed shorter than the longitudinal length of the beam main body 21. As a result, a longitudinal portion of the underside of the lower main body flange 232 is an exposed surface without the reinforcing portion 24. The load-bearing frame 4 is connected to the exposed surface. The load-bearing frame 4 is connected to the reinforced beam 2 by welding the upper end of the column 41 to the exposed surface of the lower main body flange 232 of the beam main body 21 of the reinforced beam 2, but the connection may also be by bolting or the like, and the connection method is not limited.

[0048] When the load-bearing frame 4 is connected to the underside of the reinforcing beam 2, if the load-bearing frame 4 is connected to the underside of the reinforcing portion 24, the reinforcing portion 24 is not joined to the joining member 3, and is therefore more likely to collapse when subjected to force from the load-bearing frame 4. However, as in the third embodiment, by connecting the load-bearing frame 4 to the exposed surface, which is the underside of the beam main body portion 21, rather than to the underside of the reinforcing portion 24, the reinforcing portion 24 is less likely to collapse, and a decrease in the bending rigidity of the reinforcing beam 2 due to the reinforcing portion 24 collapsing can be suppressed.

[0049] <4> Variations Next, modifications of the first to third embodiments will be described.

[0050] The beam structure 1 does not have to be a part of the frame 10 of the prefabricated house, and is not particularly limited thereto. Furthermore, the frame 10 is not limited to the above-mentioned configuration.

[0051] The beam body 21 of the reinforcing beam 2 is not limited to so-called H-shaped steel, but may be made of metal (or may include non-metal) having a web and flanges formed at the upper and lower ends of the web. The specific value of the vertical length H21 of the beam body 21 is not limited to 250 mm. The specific value of the widthwise length B21 of the beam body 21 is not limited to 100 mm. The specific value of the thickness of the main body web 22 and the main body flange 23 is not limited to 4.5 mm.

[0052] The specific value of the widthwise length of the reinforcing flange 26 of the reinforcing portion 24 is not limited to 100 mm. The reinforcing portion 24 is not limited to so-called T-beam, but may be made of metal (or may include non-metal) having a web and a flange formed at the lower end of the web. The specific value of the vertical length H24 of the reinforcing portion 24 is not limited to 150 mm. The specific value of the widthwise length of the reinforcing portion 24 is not limited to 100 mm. The specific values ​​of the thicknesses of the reinforcing web 25 and the reinforcing flange 26 are not limited to 4.5 mm.

[0053] The lower limit of the vertical length H24 of the reinforcing portion 24 may be 10%, 15%, 20%, 30%, etc. of the vertical length H21 of the beam main body portion 21, and is set as appropriate.

[0054] The column 12 may be connected to the reinforcing beam 2 by bolting or the like instead of welding, and the connection method is not limited. The point where the column 12 is connected to the reinforcing beam 2 does not have to be below the part of the reinforcing beam 2 where the horizontal stiffening beam 6 is connected.

[0055] A single connecting member 3 does not necessarily have to have multiple connecting webs 31. The vertical length of the connecting web 31 is not limited to 250 mm. The length of one side of the connecting flange 32 is not limited to 100 mm. The thickness of the connecting web 31 is not limited to 4.5 mm, and the thickness of the connecting flange 32 is not limited to 6 mm. The connection between the columns 12, 14 and the connecting member 3 does not have to be by a connector made of bolts and nuts, and may be by welding, for example, and is not particularly limited. The connection between the reinforcing beam 2 and the connecting member 3 does not have to be by a connector made of bolts and nuts, and may be by welding, for example, and is not particularly limited. When joining the reinforcing beam 2 and the connecting member 3 by welding, not only the main body web 22 and the connecting web 31 may be welded, but also the main body flange 23 and the connecting flange 32 may be welded to join them. Furthermore, the longitudinal end of the main body flange 23 may be joined to the connecting flange 32 rather than facing the connecting flange 32.

[0056] The normal beam 5 is an optional configuration in the beam structure 1 of the present disclosure and need not be provided in particular. Furthermore, the beam body portion 51 constituting the normal beam 5 does not have to be the same as the beam body portion 21 of the reinforced beam 2. The joining of the normal beam 5 and the joining member 3 does not have to be a connection using fasteners consisting of bolts and nuts, and may be, for example, welding, and is not particularly limited. Furthermore, the longitudinal end of the main body flange 53 may be joined to the joining flange 32 rather than facing the joining flange 32.

[0057] The horizontal stiffening beams 6 are an optional component in the beam structure 1 of the present disclosure and may not be provided. The horizontal stiffening beams 6 do not have to be made of H-shaped steel. The specific value of the widthwise length of the stiffening flanges 62 is not limited to 100 mm. The specific value of the thickness of the stiffening webs 61 is not limited to 2.8 to 4.5 mm, and the specific value of the thickness of the stiffening flanges 62 is not limited to 3.2 to 12 mm. The specific value of the vertical length H21 of the horizontal stiffening beams 6 is not limited to 250 mm. The shape of the cross section perpendicular to the longitudinal direction of the horizontal stiffening beams 6 does not have to be the same as the shape of the cross section perpendicular to the longitudinal direction of the normal beams 5. For example, it may be the same as the shape of the cross section perpendicular to the longitudinal direction of the reinforcing beams 2, and is not particularly limited. The stiffening webs 61 may be connected to the main webs 22 by bolting or the like instead of welding, and the connection method is not limited. The stiffening flanges 62 and the main flanges 23 may also be connected by welding, bolting, or the like.

[0058] <5> summary As is clear from the first to third embodiments and their modifications described above, the first aspect is a beam structure 1 including a reinforcing beam 2 and a connecting member 3 to which a longitudinal end of the reinforcing beam 2 is connected. The reinforcing beam 2 has a beam main body 21 and a reinforcing portion 24. The beam main body 21 has a main body web 22 extending in the vertical direction and main body flanges 23 formed at the upper and lower ends of the main body web 22, respectively. The reinforcing portion 24 has a reinforcing web 25 extending downward from the lower main body flange 232 and a reinforcing flange 26 formed at the lower end of the reinforcing web 25. The vertical length H24 of the reinforcing portion 24 is 60% or less of the vertical length H21 of the beam main body 21. The connecting member 3 has a connecting web 31 and a connecting flange 32. The connecting web 31 extends in the vertical direction and corresponds to the longitudinal end of the main body web 22. The joining flanges 32 are formed at the upper and lower ends of the joining web 31, respectively, and correspond to the longitudinal ends of the main body flange 23. The longitudinal end of the main body web 22 is joined to the joining web 31. The longitudinal end of the main body flange 23 is joined to or faces the joining flange 32.

[0059] According to the first aspect, in a reinforcing beam 2 having a reinforcing portion 24 that is not joined to a joining member 3, the reinforcing portion 24 is less likely to collapse, and a decrease in the bending rigidity of the reinforcing beam 2 due to the collapse of the reinforcing portion 24 can be suppressed.

[0060] The second aspect is realized by combining the first aspect. In the second aspect, the beam structure 1 further includes a bearing frame 4 that constitutes a bearing wall. The bearing frame 4 is connected to the upper body flange 231 of the reinforcing beam 2.

[0061] According to the second aspect, the load-bearing frame 4 is not directly joined to the reinforcing portion 24, and therefore the reinforcing portion 24 is not particularly restricted, and the bending rigidity of the reinforcing beam 2 can be easily increased.

[0062] The third aspect is realized by combining the first or second aspect. In the third aspect, the beam structure 1 further includes a bearing frame 4 that constitutes a bearing wall. In the reinforced beam 2, the longitudinal length of the reinforcing portion 24 is shorter than the longitudinal length of the beam main body portion 21, and a portion of the longitudinal direction of the underside of the lower main body flange 232 is an exposed surface without the reinforcing portion 24. The bearing frame 4 is connected to the exposed surface.

[0063] According to the third aspect, the reinforcing portion 24 is made less likely to collapse, and a decrease in the bending rigidity of the reinforcing beam 2 due to the reinforcing portion 24 collapsing can be suppressed.

[0064] The fourth aspect is realized by combining with any one of the first to third aspects. In the fourth aspect, the beam structure 1 further includes a normal beam 5 having a beam main body portion 51 and no reinforcing portion. One connecting member 3 has a plurality of connecting webs 31 and connecting flanges 32. The longitudinal end of the main body web 52 of the beam main body portion 51 of the normal beam 5 is connected to the connecting web 31. The longitudinal end of the main body flange 53 of the beam main body portion 51 of the normal beam 5 is connected to or faces the connecting flange 32.

[0065] According to the fourth aspect, the reinforcing beams 2 can be used only in the necessary portions, which makes it easier to carry out design and construction and also helps to reduce costs.

[0066] The fifth aspect is realized by combining with any one of the first to fourth aspects. In the fifth aspect, the beam structure 1 further includes a horizontal stiffening beam 6. The longitudinal end of the horizontal stiffening beam 6 is connected to a side surface of the beam main body 21 of the reinforcing beam 2 along the longitudinal direction.

[0067] According to the fifth aspect, by connecting the horizontal stiffening beam 6 to the reinforcing beam 2, the reinforcing portion 24 is less likely to collapse, and the decrease in bending rigidity of the reinforcing beam 2 due to the collapse of the reinforcing portion 24 can be further suppressed. [Explanation of symbols]

[0068] 1 beam structure 10 Frame structure 11 Foundation beam 12 pillars 13 Floor beam 14 pillars 15 Roof beams 16 Main body cylinder 17 Flange 18 Connection 2 Reinforced beams 21 Beam body 22 Main body web 221 Connection 222 Connection piece 223 Connection 23 Body flange 231 Upper body flange 232 Lower body flange 24 Reinforcement 25 Reinforcing web 26 Reinforcement flange 27 Corner 3 Joint materials 31 Joint web 311~314 Joint 32 Joint flange 321 Upper connecting flange 322 Lower connecting flange 33 Connection 34 Connection 4. Load-bearing frame 41 pillars 42 Brace material 5 Normal beam 51 Beam body 52 Main body web 521 Connection 53 Body flange 531 Upper body flange 532 Lower body flange 6 Lateral stiffening beam 61 Stiffening web 62 Stiffening flange 621 Upper stiffening flange 622 Lower stiffening flange B21 Width direction length H21 Vertical length H24 Vertical length

Claims

1. Reinforcement beams; a joining member to which an end portion of the reinforcing beam in the longitudinal direction is joined, The reinforcing beam is a beam body portion having a body web extending in the vertical direction and body flanges formed at the upper and lower ends of the body web, a reinforcing portion having a reinforcing web extending downward from the lower body flange and a reinforcing flange formed at a lower end of the reinforcing web, The vertical length of the reinforcing portion is 60% or less of the vertical length of the beam main body portion, The joining member is a joining web extending in the vertical direction and corresponding to an end of the main web in the longitudinal direction; and joining flanges formed at the upper and lower ends of the joining web, respectively, and corresponding to the longitudinal ends of the main body flanges, the end portions of the main body web in the longitudinal direction are joined to the joining web, The end of the main body flange in the longitudinal direction is joined to or faces the joining flange, The reinforcing portion is formed over the entire length of the beam main body portion in the longitudinal direction. Beam structure with reinforced beams and connecting members.

2. Further provided with a bearing frame constituting a bearing wall, The load-bearing frame is connected to the main body flange on the upper side of the reinforcing beam. A beam structure comprising the reinforcing beam and the connecting member according to claim 1.

3. Reinforcement beams; a joining member to which an end portion of the reinforcing beam in the longitudinal direction is joined; a bearing frame that constitutes a bearing wall; The reinforcing beam is A main body web extending in the vertical direction and a pair of ribs formed at the upper and lower ends of the main body web. a beam body having a body flange; a reinforcing portion having a reinforcing web extending downward from the lower body flange and a reinforcing flange formed at a lower end of the reinforcing web, The vertical length of the reinforcing portion is 60% or less of the vertical length of the beam main body portion, The joining member is a joining web extending in the vertical direction and corresponding to an end of the main web in the longitudinal direction; and joining flanges formed at the upper and lower ends of the joining web, respectively, and corresponding to the longitudinal ends of the main body flanges, the end portions of the main body web in the longitudinal direction are joined to the joining web, The end of the main body flange in the longitudinal direction is joined to or faces the joining flange, In the reinforced beam, the longitudinal length of the reinforcing portion is shorter than the longitudinal length of the beam main body portion, and a portion of the lower surface of the lower main body flange in the longitudinal direction is an exposed surface without the reinforcing portion, the reinforcing portion is not joined to the joining member, the load-bearing frame is connected to the exposed surface; Beam structure with reinforced beams and connecting members.

4. Further provided is a normal beam having the beam main body portion and not having the reinforcing portion, One of the joining members has a plurality of the joining webs and the joining flanges, The end portion in the longitudinal direction of the main body web of the beam main body portion of the normal beam is joined to the joining web, The end portion in the longitudinal direction of the main body flange of the beam main body portion of the normal beam is joined to or faces the joining flange, A beam structure comprising a reinforcing beam and a connecting member according to any one of claims 1 to 3.

5. Further provided with a horizontal stiffening beam, The end portion in the longitudinal direction of the horizontal stiffening beam is connected to a side surface along the longitudinal direction of the beam main body portion of the reinforcing beam. A beam structure comprising a reinforcing beam and a joining member according to any one of claims 1 to 4.

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