Building

Abstract

To provide a building 100 having a composite structural beam 2 excellent in a cost advantage despite using a woody material.SOLUTION: A building 100 according to the invention is the building 100 having a frame structure 110. The frame structure 110 comprises: a pair of steel columns 1, 1; a pair of joint parts 20, 20 on top ends of the pair of columns 1, 1; and a composite structural beam 2 disposed so as to bridge between the pair of joint parts 20, 20. The pair of joint parts 20, 20 are reinforced concrete structure. The composite structural beam 2 comprises: a first beam end 10 and a second beam end 12 that have the reinforced concrete structure and protrude from the pair of joint parts 20, 20, respectively; and a beam intermediate member 30 that is a woody material sandwiched between the first beam end 10 and the second beam end 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to buildings comprising composite structural beams. [Background technology]

[0002] The 2000 revision of the Building Standards Act made it possible to construct fire-resistant wooden buildings by ensuring certain performance standards. In recent years, there has been an active movement in both the public and private sectors to promote demand for wooden structures, leading to the standardization of wooden structural materials and revisions to the Building Standards Act. In particular, in recent years, from the perspective of reducing environmental impact, there has been an increasing number of cases in which wooden structures are used in medium- to large-scale buildings. However, the cost of wooden components in medium- to large-scale buildings tends to be high.

[0003] For example, in the "Column-Beam Joint Structure" of Patent Document 1, a precast concrete joint member is proposed for connecting a wooden column and a wooden beam. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-2641 Summary of the Invention [Problem to be solved by the invention]

[0005] However, all-wood beams require a large cross section to ensure rigidity, which tends to increase costs.

[0006] Therefore, an object of the present invention is to provide a building equipped with a composite structural beam that has excellent cost benefits while using wooden beams. [Means for solving the problem]

[0007] The present invention has been made to solve at least some of the above-mentioned problems, and can be realized as the following aspects or application examples.

[0008] [1] One aspect of the building according to the present invention is: A building with a rigid-frame structure, The rigid frame structure includes a pair of columns made of wood material, a pair of joints at the upper ends of the pair of columns, and a composite structural beam installed between the pair of joints, The pair of joints are made of reinforced concrete, The composite structural beam is characterized by comprising a pair of reinforced concrete beam end portions each protruding from a pair of the joint portions, and a beam intermediate member made of wood material sandwiched between the pair of beam end portions.

[0009] [2] In one aspect of the above building, The beam end is precast concrete formed integrally with the joint portion, The joint portion includes a lower joint member protruding toward the upper end of the pillar, The beam end portion includes a beam joint member protruding toward the beam intermediate member, The pillar has a first receiving portion formed at the upper end into which the lower joining member is inserted, The beam intermediate member has second receiving portions formed at both longitudinal ends thereof into which the beam connecting members are inserted, The joint portion is joined to the column with the lower joint member inserted into the first receiving portion, The beam end portion can be joined to the beam intermediate member in a state where the beam joining member is inserted into the second receiving portion.

[0010] [3] In one aspect of the above building, The beam end is precast concrete formed integrally with the joint portion, The joint portion includes a lower joint member protruding toward the upper end of the pillar, The beam end portion includes a mounting portion protruding toward the beam intermediate member, The pillar has a first receiving portion formed at the upper end into which the lower joining member is inserted, The joint portion is joined to the column with the lower joint member inserted into the first receiving portion, The beam intermediate member can be placed on the placing portion such that both ends in the longitudinal direction thereof face each other.

[0011] [4] In one aspect of the above building, The joint portion includes a plurality of rods protruding upward from an upper surface of the joint portion, The column of the floor immediately above the column is installed on the joint portion via a base plate fixed to the plurality of rods and an upper joint member installed on the base plate, The upper joint member, the base plate, and the plurality of rods between the column of the immediately upper floor and the joint portion may be embedded in concrete.

[0012] [5] In one aspect of the above building, the lower joint member is a part of a plurality of rods that penetrate the joint portion and protrude upward from the upper surface of the joint portion, The column on the floor immediately above the column includes a plurality of lower rods protruding downward from the lower end of the column on the floor immediately above, The plurality of rods and the plurality of lower rods between the columns of the immediately upper floor and the joints may be embedded in concrete while being fixed to each other by mechanical joints. [Effects of the Invention]

[0013] According to one aspect of the building of the present invention, a building can be provided that uses wooden beams but is equipped with composite structural beams that offer excellent cost benefits. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view schematically showing a rigid frame structure of a building according to a first embodiment. [Figure 2] FIG. 2 is an enlarged front view of a portion of the rigid frame structure of FIG. [Figure 3] FIG. 2 is a perspective view illustrating the assembly process of the joint portion of FIG. 1. [Figure 4] FIG. 10 is an enlarged front view showing a part of the rigid frame structure of the building according to the second embodiment. [Figure 5] FIG. 10 is an enlarged front view showing a part of the rigid frame structure of the building according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. Note that the embodiments described below do not unduly limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential components of the present invention.

[0016] One aspect of the building according to this embodiment is a building with a rigid frame structure, the rigid frame structure comprising a pair of wooden columns, a pair of joints at the top ends of the pair of columns, and a composite structural beam installed between the pair of joints, the pair of joints being made of reinforced concrete. The composite structural beam is made of reinforced concrete, and is characterized by having a pair of reinforced concrete beam ends that respectively protrude from the pair of joint sections, and a beam intermediate member made of wood material sandwiched between the pair of beam ends.

[0017] 1. First embodiment A building 100 according to a first embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a front view that schematically shows a rigid frame structure 110 of the building 100 according to the first embodiment, Figure 2 is a front view that shows an enlarged portion of the rigid frame structure 110 of Figure 1, and Figure 3 is a perspective view that explains the assembly process of the joint 40 of Figure 1. Figure 2 shows the entire structure in vertical cross section to explain the structure of the joint 40. Note that although Figure 2 only shows the structure of one of the joints 40, the other joint 40 can also basically adopt a similar structure.

[0018] Overview As shown in FIG. 1, the building 100 is a building 100 equipped with a rigid frame structure 110. The rigid frame structure 110 includes a pair of wooden columns 1, 1, a pair of joints 20, 20 at the upper ends of the columns 1, 1, and a composite structural beam 2 installed between the pair of joints 20, 20. The building 100 is equipped with multiple rigid frame structures 110, similar to a typical building equipped with a rigid frame structure (not shown). Columns 1a, 1a of the floor immediately above, joined above the pair of joints 20, 20, constitute the rigid frame structure 110 of the floor immediately above. The building 100 may partially include a rigid frame structure other than the rigid frame structure 110. The rigid frame structure 110 is not limited to a one-way rigid frame structure, but may also be a two-way rigid frame structure as shown in FIG. 3. The composite structural beam 2 is a long beam that can be used, for example, in a building 100 in which the spacing between adjacent columns 1, 1 is relatively long.

[0019] The pillars 1, 1a are made of a wooden material. The wooden material used for the pillars 1, 1a may be any structural wooden material, such as solid wood, laminated lumber made by gluing and shaping multiple sawn boards, or laminated material made by laminating and gluing thin boards such as veneers.

[0020] The pair of joints 20, 20 are made of reinforced concrete. The joints 20 are joined to the column 1 at their lower ends and to the column 1a of the floor directly above at their upper ends. The joints 20 are also joined to a composite structural beam 2 extending horizontally between adjacent joints 20. The joints 20 may be made of precast concrete. Using precast concrete for the joints 20 makes it easier to adjust the level for installing the column 1a of the floor directly above.

[0021] The composite structural beam 2 comprises a pair of reinforced concrete beam ends (first beam end 10, second beam end 12) that protrude from a pair of joints 20, 20, respectively, and a wooden beam intermediate member 30 sandwiched between the pair of beam ends (first beam end 10, second beam end 12). While the configuration of the first beam end 10 and the beam intermediate member 30 is described in FIG. 2, the second beam end 12 and the beam intermediate member 30 may also have a similar configuration, and may be combined with other embodiments described later. The first beam end 10, the second beam end 12, and the beam intermediate member 30 are joined together by two joints 40, 40, but may also be integrated via a floor slab as in the third embodiment.

[0022] The first beam end 10 and the second beam end 12 are made of reinforced concrete with one end integrated with the column 1, 1, respectively. The other ends (joint ends 41, 41) of the first beam end 10 and the second beam end 12 are joined to the beam intermediate member 30 at the joint 40. Because the first beam end 10 and the second beam end 12 are made of reinforced concrete, the beam intermediate member 30, which is made of a wooden material, can be made shorter, and its cross section can be made smaller than that of a large cross section beam made of conventional laminated timber. The smaller cross section of the beam intermediate member 30 has cost benefits, such as eliminating the need for secondary bonding of laminated timber. The first beam end 10 and the second beam end 12 may be made of precast concrete formed integrally with the joint parts 20, 20. The joint parts 20 and the first beam end 10 and the joint part 20 and the second beam end 12 are each made of precast concrete formed integrally, which provides excellent workability.

[0023] The beam intermediate member 30 is a wooden material that is joined to the first beam end portion 10 and the second beam end portion 12 at both ends 32, 32. The wooden material used for the beam intermediate member 30 is a structural wooden material, and is preferably, for example, a laminated lumber made by gluing and shaping multiple sawn boards, or a laminated material made by stacking and gluing thin boards such as veneers. A concrete slab 440 may be poured on top of the beam intermediate member 30, or a wooden floor may be constructed.

[0024] 1.2. Pillar-to-joint joint As shown in Fig. 1, the joints 20, 20 are joined at their lower ends to the columns 1, 1. The joints 20, 20 may also be joined at their upper ends to the columns 1a, 1a of another rigid frame structure 110 on the floor immediately above.

[0025] As shown in FIGS. 2 and 3 , the joint 20 includes a lower connecting member 22 that protrudes toward the upper end of the column 1 below the joint 20. The lower connecting member 22 includes, for example, a horizontal steel plate 220 and vertical steel plates 221 and 222, which are formed by welding multiple steel plates together. The lower connecting member 22 may further include a drift pin 223. The lower connecting member 22 may be a glued-in rod (GIR) that extends from the inside of the joint 20 to the inside of the column 1. The horizontal steel plate 220 is joined to the underside of the joint 20 by anchoring it into the concrete of the joint 20 with studs and / or U-shaped reinforcing bars, etc. The vertical steel plates 221 and 222 are joined so as to extend downward from the underside of the horizontal steel plate 220. A plurality of through holes extending horizontally are formed near the upper ends of the vertical steel plates 221 and 222 and the column 1.

[0026] The column 1 has a first receiving portion 24 formed at its upper end into which the lower connecting member 22 is inserted. The first receiving portion 24 is formed to fit the shape of the lower connecting member 22. The first receiving portion 24 may be, for example, a slit that opens at the upper end of the column 1. Note that the members shown with diagonal lines in Figure 2 (Figures 4 and 5) are, for example, fireproof boards or wood finishing boards that are attached around the columns 1, 1a and to the underside of the composite structural beam 2.

[0027] The joint section 20 is joined to the column 1 with the lower joint member 22 inserted into the first receiving section 24. As shown in FIG. 3 , the joint section 20 is lowered onto the column 1 from above, and vertical steel plates 221, 222 are inserted from above into two slits (first receiving sections 24, 24) opening at the top end of the column 1. With the joint section 20 placed on the top end of the column 1, multiple drift pins 223 are inserted into multiple through-holes opening in the side of the column 1 to join the vertical steel plates 221, 222 to the column 1. In the case of a GIR joint, after inserting the GIR into the first receiving section 24, a resin adhesive is filled in and cured to join the two plates. By using the lower joint member 22, the precast joint section 20 can be easily positioned and joined by installing it from above the column 1, resulting in excellent workability.

[0028] The joint 20 includes multiple rods 26 protruding upward from the upper surface of the joint 20. The column 1a on the floor immediately above the column 1 is installed on the joint 20 via, for example, a base plate 27 fixed to the multiple rods 26 and an upper connecting member 28 installed on the base plate 27. The multiple rods 26 may be anchor bolts. The column 1a has third slit-shaped receiving portions 25, 25 that open to the underside. The upper connecting member 28 includes, for example, a horizontal steel plate 280, vertical steel plates 281, 282, and an H-shaped steel 284, which are formed by welding multiple steel plates together. The upper connecting member 28 may further include a drift pin 283. The upper connecting member 28 may be fixed to the column 1a in advance, for example, at a factory, before construction. The vertical steel plates 281, 282 extend upward from the upper surface of the horizontal steel plate 280. The H-shaped steel 284 extends downward from the lower surface of the horizontal steel plate 280. The vertical steel plates 281, 282 are inserted into the third receiving portion 25 of the column 1a from below, and the drift pins 283 are inserted into a plurality of through holes opened on the side surface of the column 1a. When the upper connecting member 28 is fixed to the column 1a, the H-shaped steel 284 protrudes downward from the lower end of the column 1a.

[0029] As shown in Figure 3, multiple rods 26 protrude from the upper surface of the joint 20. With the joint 20 placed on the column 1, non-shrinkage mortar (manju) is placed between the base plate 27 and the upper surface of the joint 20, and the height of the base plate 27 can be adjusted to fix the base plate 27 to the upper ends of the multiple rods 26. The upper joint member 28, base plate 27, and multiple rods 26 between the column 1a of the floor immediately above and the joint 20 may be buried in concrete 29 (Figure 2) and joined. Using the base plate 27 makes it easy to adjust the height of the column 1a, resulting in excellent workability.

[0030] As will be described in the second and third embodiments, the upper joint member 28 may be a plurality of GIRs that protrude downward from the inside of the pillar 1a.

[0031] 1.3.Beam-beam joint As shown in Fig. 1, the composite structural beam 2 has two joints 40, 40. In one joint 40 of the composite structural beam 2, one end 32 of the beam intermediate member 30 is joined to a joint end 41 of the first beam end portion 10. In the other joint 40, the other end 32 of the beam intermediate member 30 is joined to a joint end 41 of the second beam end portion 12.

[0032] The joint 40 will be described using Figures 2 and 3. The joint 40 joining the first beam end portion 10 and the beam intermediate member 30 and the joint 40 joining the second beam end portion 12 and the beam intermediate member 30 basically have the same configuration, so the joint 40 between the first beam end portion 10 and the beam intermediate member 30 will be mainly described with reference to Figure 2. The joint 40 can be, for example, a pin joint or a semi-rigid joint. With a pin joint 40, the beam intermediate member 30 only needs to bear long-term loads. With a semi-rigid joint 40, the beam intermediate member 30 can also bear seismic forces.

[0033] The joint 20 and the first beam end 10 are made of reinforced concrete with multiple beam main reinforcements 10a and stirrups 10b arranged inside. The joint 20 may be precast with the lower connecting member 22 and multiple rods 26 integrally formed, and the first beam end 10 and second beam end 12 integrally formed with the beam connecting member 42. By using precast concrete for the joint 20, the first beam end 10, and the second beam end 12, it becomes easier to join the columns 1, 1a and the beam intermediate member 30 at the construction site, resulting in excellent workability.

[0034] The first beam end portion 10 includes a beam connection member 42 that protrudes toward the beam intermediate member 30. The beam connection member 42 is integrally attached to a connection end portion 41, which is the end portion of the first beam end portion 10 opposite the joint portion 20. The beam connection member 42 includes, for example, an end steel plate 420, vertical steel plates 421 and 422, and a horizontal steel plate 423, which are formed by welding multiple steel plates together. The beam connection member 42 may further include a drift pin 424. The beam connection member 42 may be a GIR that extends from the interior of the first beam end portion 10 to the interior of the beam intermediate member 30. The end steel plate 420 is fixed to the connection end portion 41. The end steel plate 420 may have multiple studs ( FIG. 2 ) that are parallel to the vertical plane of the connection end portion 41 and extend into the connection end portion 41. The vertical steel plates 421, 422 protrude horizontally from the end steel plate 420 and extend vertically from the upper surface of the horizontal steel plate 423. The horizontal steel plate 423 extends horizontally from the lower end of the end steel plate 420. A plurality of through holes are formed in the vertical steel plates 421, 422 and the end 32 of the beam intermediate member 30. The drift pins 424 pass through a plurality of through holes formed in the vertical steel plates 421, 422 and the beam intermediate member 30 to join the vertical steel plates 421, 422 and the beam intermediate member 30.

[0035] The beam intermediate member 30 is a wooden beam supported by the first beam end portion 10 and the second beam end portion 12 of the reinforced concrete structure. Since the earthquake force is borne by the reinforced concrete structure, it is suitable for medium to large scale structures. The building 100 can employ beams made of wood. The length of the beam intermediate member 30 is, for example, 6 m or less, e.g., 5 m to 6 m. If the beam intermediate member 30 is 6 m or less, prefabricated laminated lumber can be used, resulting in high cost benefits. Even if the beam intermediate member 30 is 6 m or less, the first beam end portion 10 and the second beam end portion 12 make it applicable to long-span beams. The beam intermediate member 30 has second receiving portions 44 formed at both longitudinal ends 32, 32, into which the beam connecting member 42 is inserted. The shape of the second receiving portion 44 is processed to fit the beam connecting member 42. The second receiving portion 44 can be slit-shaped, opening at the end portion 32 toward the connecting end portion 41. The second receiving portion 44 may also have openings at the top and bottom ends of the end portion 32. The end portion 32 may be placed on the upper surface of the horizontal steel plate 423 with its tip abutting the end steel plate 420.

[0036] As shown in Figure 3, the beam intermediate member 30 is lowered from above the beam connection member 42, the vertical steel plates 421, 422 are inserted into the second receiving portion 44, and the end portion 32 is placed on the horizontal steel plate 423. The first beam end portion 10 and the beam intermediate member 30 can be joined by inserting drift pins 424 into a plurality of through holes opened on the side of the beam intermediate member 30. The first beam end portion 10 is joined to the beam intermediate member 30 with the beam connection member 42 inserted into the second receiving portion 44. The beam intermediate member 30 can be installed on the first beam end portion 10 by lowering it onto the horizontal steel plate 423 from above, resulting in excellent workability.

[0037] The building 100 according to this embodiment employs a composite structural beam 2 while using a wood material for the intermediate beam member 30, resulting in excellent cost benefits. Because the intermediate beam member 30 is made of wood, it can be joined to a lightweight wooden floor using conventional nail joints or other methods, making it easy to evaluate the shear force transmission performance and providing excellent workability. Furthermore, by providing the first beam end portion 10 and the second beam end portion 12 made of reinforced concrete at both ends, the building 100 can be provided with a rigid frame structure 110 that includes a composite structural beam 2 that has excellent flexural rigidity under long-term loads while using the intermediate beam member 30 made of wood. The building 100 can be provided with a frame that is more rigid than a pure wood frame, thereby suppressing vertical and horizontal deformation in large-span buildings and buildings of medium or larger heights.

[0038] 2. Second embodiment The rigid frame structure 110 of the building 100 according to the second embodiment will be described with reference to Fig. 4. Fig. 4 is a front view showing an enlarged portion of the rigid frame structure 110 of the building 100 according to the second embodiment. The composite structural beam 2 shown in Fig. 4 is similar to the composite structural beam 2 according to the first embodiment, and therefore a duplicated description will be omitted.

[0039] 4, the rigid frame structure 110 of the second embodiment differs from that of the first embodiment in the joint structure between the joint 20 and the columns 1, 1a. The joint 20 can be joined to the columns 1, 1a by a semi-rigid joint, for example, by the GIR method.

[0040] The lower connecting member 22a is part of a plurality of rods that penetrate the joint 20 and protrude upward from the upper surface of the joint 20. The lower connecting member 22a is, for example, a bar-shaped steel material. The lower connecting member 22a penetrates the joint 20 from top to bottom, with its lower end extending to the inside of the column 1 and its upper end protruding from the upper surface of the joint 20. If the joint 20 is made of precast concrete, for example, a sheath pipe that opens on the upper and lower surfaces of the joint 20 may be embedded inside the joint 20 in advance. A horizontal steel plate 220 having a plurality of through holes formed therein through which the lower connecting member 22 can pass is fixed to the lower surface of the joint 20.

[0041] The lower joint members 22a are a plurality of GIRs, for example, eight, arranged at predetermined intervals along the outer periphery of the pillar 1. The pillar 1 is formed with first receiving portions 24a that extend downward from the top surface of the pillar 1. The first receiving portions 24a are a plurality of holes that are arranged at positions that fit the lower joint members 22a. The lower joint members 22a are integrated with the pillar 1 by being filled with resin adhesive while inserted into the first receiving portions 24a. The lower joint members 22a extend downward from the top surface of the pillar 1 at predetermined positions. For ease of construction, it is preferable that the column 1 and the lower joint member 22a are integrated in advance before being transported to the construction site.

[0042] To join the column 1 and the joint 20, for example, a precast joint 20 is lowered from above the column 1, and the lower joint member 22a protruding from the top surface of the column 1 is passed through the horizontal steel plate 220 of the joint 20 and the sheath pipe, and the joint 20 is installed on the column 1. Then, the sheath pipe is filled with a resin adhesive to integrate the joint 20 and the lower joint member 22a.

[0043] The column 1a on the floor directly above the column 1 has, for example, multiple lower rods (upper connecting members 28a) protruding downward from the lower end of the column 1a on the floor directly above. The upper connecting members 28a are, for example, bar-shaped steel materials. The upper connecting members 28a extend downward from the interior of the column 1a and protrude from the horizontal steel plate 280 at the lower end. The upper connecting members 28a are multiple GIRs, for example, eight. The column 1a is formed with third receiving portions 25a extending upward from the underside of the column 1a. The third receiving portions 25a are multiple holes arranged in positions that fit the upper connecting members 28a. The upper connecting members 28a are inserted into the third receiving portions 25a and filled with resin adhesive, becoming integrated with the column 1a. The upper connecting members 28a extend a predetermined length upward from the underside of the column 1a. For ease of construction, it is preferable that the pillar 1a and the upper joint member 28a be integrated in advance before being transported to the construction site.

[0044] The multiple rods (lower joint member 22a) and multiple lower rods (upper joint member 28a) between the column 1a of the floor immediately above and the joint 20 are fixed to each other with mechanical joints 23 and embedded in concrete 29. When the joint 20 is made of precast concrete, the joint 20 is lowered from above the column 1 and installed, and resin adhesive is poured to join the column 1 and the joint 20. The column 1a is then installed on top of the joint 20, and the joint 20 and the column 1a are joined by fixing with the mechanical joints 23 and pouring concrete 29. The use of a precast joint 20 provides excellent workability. The building 100 according to the second embodiment, like the first embodiment, can provide a building 100 equipped with a composite structural beam 2 that is cost-effective despite using wood materials. Furthermore, the semi-rigid connection between the columns 1, 1a and the joint 20 allows it to withstand seismic forces in addition to long-term loads.

[0045] 3. Third embodiment The rigid frame structure 110 of the building 100 according to the third embodiment will be described with reference to Fig. 5. Fig. 5 is a front view showing an enlarged portion of the rigid frame structure 110 of the building 100 according to the third embodiment. The joint portion 20 and the joining structure of the columns 1, 1a shown in Fig. 5 are the same as those of the rigid frame structure 110 according to the second embodiment, and therefore, redundant explanations will be omitted.

[0046] 5, the rigid frame structure 110 of the third embodiment differs from the first and second embodiments in the joint structure of the composite structural beam 2a. The joint 40a may be joined by overlapping using the so-called "Aijakuri" method.

[0047] The first beam end portion 10 can be made of precast concrete formed integrally with the joint portion 20. The first beam end portion 10 has a mounting portion 46 that protrudes toward the beam intermediate member 30. The mounting portion 46 is a portion that protrudes from the end face of the first beam end portion 10 opposite the joint portion 20, and has a horizontally extending flat surface on which the end portion 32a of the beam intermediate member 30 is placed. The mounting portion 46 has a shape in which the upper part of the end face of the first beam end portion 10 is cut out. For example, two steel bars 10c are placed inside the mounting portion 46 for reinforcement. The steel bars 10c extend horizontally from the mounting portion 46 toward the joint portion 20.

[0048] The beam intermediate member 30 is placed on the support portion 46, with both longitudinal ends 32a, 32a facing each other. The end 32a has a notch at the bottom to form a flat surface extending horizontally. The end portion 32a is formed in an inverted L-shape corresponding to the L-shaped protruding mounting portion 46.

[0049] The beam intermediate member 30 can be installed in a predetermined position on the mounting portion 46 of the first beam end portion 10, which extends from the joint portion 20 installed on the column 1, by placing the end portion 32a from above on the mounting portion 46, similar to the sojakuri construction method. Therefore, the joint portion 40a is not directly joined, but is indirectly integrated with the first beam end portion 10 by, for example, integrating the concrete slab 440 and the beam intermediate member 30 with a plurality of lag screw bolts protruding from the upper surface of the beam intermediate member 30. The building 100 according to the third embodiment can provide a building 100 equipped with a composite structural beam 2a that is excellent in cost merit even though a wood material is used for the composite structural beam 2a. Furthermore, the composite structural beam 2a has excellent workability because the beam intermediate member 30 is simply placed on it.

[0050] The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations with the same function, method, and result, or configurations with the same purpose and effect). The present invention also includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. The present invention also includes configurations that achieve the same effects or purposes as the configurations described in the embodiments. The present invention also includes configurations in which publicly known technology is added to the configurations described in the embodiments. [Explanation of symbols]

[0051] DESCRIPTION OF SYMBOLS 1,1a...column, 2,2a...composite structural beam, 10...first beam end, 10a...beam main reinforcement, 10b...stirrup, 10c...steel bar, 12...second beam end, 20...joint, 22,22a...lower connecting member, 23...mechanical joint, 24,24a...first receiving portion, 25,25a...third receiving portion, 26...rod, 27...base plate, 28,28a...upper connecting member, 29...concrete, 30...beam intermediate member, 32,32a...end, 40,40a... Joint portion, 41...joint end portion, 42...beam joint member, 44...second receiving portion, 46...placing portion, 100...building, 110...rigid frame structure, 220...horizontal steel plate, 221, 222...vertical steel plate, 223...drift pin, 280...horizontal steel plate, 281, 282...vertical steel plate, 283...drift pin, 284...H-shaped steel, 420...end steel plate, 421, 422...vertical steel plate, 423...horizontal steel plate, 424...drift pin, 440...concrete slab

Claims

1. A building with a rigid-frame structure, The rigid frame structure includes a pair of columns made of wood material, a pair of joints at the upper ends of the pair of columns, and a composite structural beam installed between the pair of joints, The pair of joints are made of reinforced concrete, A building characterized in that the composite structural beam comprises a pair of reinforced concrete beam ends each protruding from a pair of the joint sections, and a beam intermediate member made of wood material sandwiched between the pair of beam ends.

2. In the building according to claim 1, The beam end is precast concrete formed integrally with the joint portion, The joint portion includes a lower joint member protruding toward the upper end of the pillar, The beam end portion includes a beam joint member protruding toward the beam intermediate member, The pillar has a first receiving portion formed at the upper end into which the lower joining member is inserted, The beam intermediate member has second receiving portions formed at both longitudinal ends thereof into which the beam connecting members are inserted, The joint portion is joined to the column with the lower joint member inserted into the first receiving portion, The beam end portion is joined to the beam intermediate member when the beam joining member is inserted into the second receiving portion.

3. In the building according to claim 1, The beam end is precast concrete formed integrally with the joint portion, The joint portion includes a lower joint member protruding toward the upper end of the pillar, The beam end portion includes a mounting portion protruding toward the beam intermediate member, The pillar has a first receiving portion formed at the upper end into which the lower joining member is inserted, The joint portion is joined to the column with the lower joint member inserted into the first receiving portion, A building, wherein both longitudinal ends of the intermediate beam member are placed on the opposing supporting portions.

4. In the building according to any one of claims 1 to 3, The joint portion includes a plurality of rods protruding upward from an upper surface of the joint portion, The column of the floor immediately above the column is installed on the joint portion via a base plate fixed to the plurality of rods and an upper joint member installed on the base plate, A building characterized in that the upper joint member, the base plate, and the plurality of rods between the column of the floor immediately above and the joint portion are embedded in concrete.

5. In the building according to claim 2 or claim 3, the lower joint member is a part of a plurality of rods that penetrate the joint portion and protrude upward from the upper surface of the joint portion, The column on the floor immediately above the column includes a plurality of lower rods protruding downward from the lower end of the column on the floor immediately above, A building characterized in that the plurality of rods and the plurality of lower rods between the column of the floor immediately above and the joint are embedded in concrete while being fixed to each other by mechanical joints.

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