Column-beam joint structure

Abstract

To provide a column-beam joint structure in which a wooden beam is joined to a bracket that projects laterally from a column, which can suppress or prevent the end of the wooden beam from bearing bending moment and is excellent at amounting to the bracket.SOLUTION: In a column-beam joint structure 100, a pair of wooden beams 40 are arranged side by side with a gap 45 between them to form a laminated wooden beam 30, which is connected to a bracket 20 projecting from the side surface 11 of a column 10, a placement block 50 is placed on the bracket 20 between the pair of wooden beams 40 and joined to both wooden beams 40, and the underside 51 of the placement block 50 and the underside 41 of the end 44 of the laminated wooden beam 30 are placed on the bracket 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a column-beam joint structure.

Background Art

[0002] RC (Reinforced Concrete) columns, S (Steel) columns, SRC (Steel Reinforced Concrete) columns, or even wooden columns are used. Brackets made of RC or S are protruded from the side of the columns, and a wooden beam is bolted or otherwise joined to the brackets. Then, a floor slab made of, for example, RC, wood, or steel is placed on the wooden beam. Such a building structure may be applied. For example, in addition to columns constructed on-site, there are PCa (Precast Concrete) columns that are factory-produced, transported to the site, and assembled on-site. By applying the latter PCa columns, a column-beam joint structure with a significantly shortened construction period and excellent quality can be constructed. Also, there are various types of configurations for the columns and brackets. For example, an RC structure in which the column and the bracket are integrated, or a configuration in which a joint with a bracket is interposed between upper and lower columns can be cited as an example. In addition, floor slabs supported by wooden beams also exist in various forms, such as PCa floor slabs and wooden floor slabs, in addition to RC floor slabs constructed on-site.

[0003] Thus, by applying a wooden beam to the beam, it is possible to reduce the load on the environment, and due to its light weight, the handling and constructability of the beam at the site are improved, and the excellent aesthetic design property emitted by the wood is exhibited.

[0004] Here, Patent Document 1 proposes a column-beam joint structure for a wooden column and a wooden beam. This column-beam joint structure includes a steel column-side joint member provided at the joint portion of the column, a steel beam-side joint member provided at the end portion in the material axis direction of the beam, a joining means for joining the upper end portion of the beam-side joint member to the column-side joint member, and a transmitting means for transmitting the vertical downward shear force acting on the beam-side joint member to the column-side joint member. At the axial end of the wooden beam, a notch portion into which the beam-side vertical plate of the beam-side joint member is inserted and a pin hole into which a drift pin is inserted are formed. By inserting the beam-side vertical plate of the beam-side joint member into the notch portion at the axial end of the wooden beam and inserting the drift pin into the pin hole, the axial end of the wooden beam is joined to the beam-side joint member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the column-beam joint structure described in Patent Document 1, the beam-side vertical plate constituting the beam-side joint member bolted to the wooden column is inserted into the notch portion of the wooden beam and joined to each other via a drift pin, having a rigid joint structure. Therefore, it is inevitable that the end portion of the wooden beam bears the bending moment, and it does not provide a joint structure for suppressing at least the burden of the bending moment. In the case of wooden beams, it is necessary to set a large safety factor in design because of the generally large variation in strength and the concern about brittle fracture. Therefore, from the viewpoint of limiting the load applied to the wooden beam and minimizing uncertainty as much as possible, suppressing the burden of the above-mentioned bending moment becomes extremely important.

[0007] The present invention has been made in view of the above problems, and relates to a column-beam joint structure in which a wooden beam is joined to a bracket that projects laterally from a column, and aims to provide a column-beam joint structure that can suppress or prevent the end of the wooden beam from bearing a bending moment and has excellent attachability to the bracket.

Means for Solving the Problems

[0008] To achieve the above object, one aspect of the column-beam joint structure according to the present invention is a column-beam joint structure in which a combined wooden beam formed by arranging a pair of wooden beams side by side with a gap with respect to a bracket projecting from the side surface of a column is joined, a mounting block placed on the bracket is disposed between the pair of wooden beams and joined to both of the wooden beams, and the lower surface of the mounting block and the lower surface of the end of the combined wooden beam are placed on the bracket.

[0009] According to this aspect, since the pair of wooden beams forming the combined wooden beam are placed on the bracket with the mounting block sandwiched therebetween, only the ends of the pair of wooden beams and the mounting block are placed on the bracket, so that the attachability of the wooden beam to the bracket is improved. Also, due to the configuration in which the wooden beam is placed in this way, the end of the wooden beam is suppressed or prevented from bearing a bending moment.

[0010] Furthermore, since the lower surfaces of the pair of wooden beams and the mounting block disposed therebetween are placed on the bracket, the pressure-receiving area of the members placed on the bracket can be increased as compared with the case where only the lower surfaces of the pair of wooden beams are placed, and the embedding strength of the wooden beam, which can be a structural determining factor in the design of the column-beam joint structure, can be increased.

[0011] Here, since the upper surfaces of the pair of wooden beams and the mounting block are flush with each other, the floor slab can be installed flat and stably on the upper surfaces of the respective flush members, which is preferable because of excellent appearance design.

[0012] In this embodiment, the column and the bracket may be in various forms such as RC construction constructed on-site, precast RC construction fabricated in a factory, S construction, wooden construction, etc., in addition to these.

[0013] Further, another aspect of the column-beam joint structure according to the present invention is A recess is provided below the ends of the pair of wooden beams, the lower surface of the recess and the lower surface of the mounting block are flush with each other, and the lower surface of the recess and the lower surface of the mounting block are placed on the bracket.

[0014] According to this embodiment, since the lower surface of the recess below the ends of the pair of wooden beams and the lower surface of the mounting block are flush with each other, and the lower surface of the recess and the lower surface of the mounting block are placed on the bracket, although only the pair of wooden beams and the mounting block are placed on the bracket, a stable mounting posture of the joined wooden beams can be formed by the engagement structure.

[0015] Here, by making the lower surface of the bracket and the lower surfaces of the pair of wooden beams flush with each other in the engaged posture, a ceiling board or the like can be installed flat and stably with respect to the lower surfaces of the flush members, which is preferable because of excellent appearance design.

[0016] Further, another aspect of the column-beam joint structure according to the present invention is A column-beam joint structure in which a wooden beam is joined to a bracket projecting from the side surface of a column, A mounting block is disposed on one of the left and right sides of the wooden beam and joined to the wooden beam, and the lower surface of the mounting block and the lower surface of the end of the wooden beam are placed on the bracket.

[0017] According to this aspect, since one wooden beam and one mounting block on its side are placed on the bracket, and only the end of one wooden beam and the mounting block are placed on the bracket, the attachability of the wooden beam to the bracket is improved. Due to the configuration in which the wooden beam is placed in this way, the burden on the end of the wooden beam due to the bending moment is suppressed or inhibited. Further, since the lower surfaces of one wooden beam and one mounting block arranged on its side are placed on the bracket, the pressure-receiving area of the members placed on the bracket can be increased compared to the case where only the lower surface of one wooden beam is placed, and the embedding strength of the wooden beam, which can be a structural determining factor in the design of the column-beam joint structure, can be enhanced.

[0018] Also in this aspect, since the upper surfaces of both one wooden beam and one mounting block are flush, the floor slab can be installed flat and stably on the upper surfaces of the two flush members, which is preferable because of the excellent external design.

[0019] Moreover, another aspect of the column-beam joint structure according to the present invention is a column-beam joint structure in which a wooden beam is joined to a bracket protruding from the side surface of a column, characterized in that a pair of mounting blocks are arranged on the left and right sides of the wooden beam and joined to the wooden beam, and the lower surfaces of the pair of mounting blocks and the lower surface of the end of the wooden beam are placed on the bracket.

[0020] According to this aspect, since only one end of a wooden beam and a pair of mounting blocks are placed on the bracket by placing one wooden beam and a pair of mounting blocks on the left and right sides thereof on the bracket, the attachability of the wooden beam to the bracket is improved. Due to the configuration in which the wooden beam is placed in this way, the burden on the end of the wooden beam due to the bending moment is suppressed or prevented. Further, since the lower surfaces of one wooden beam and each of the pair of mounting blocks disposed on the left and right sides thereof are placed on the bracket, the pressure receiving area of the members placed on the bracket can be increased as compared with the case where only the lower surface of one wooden beam is placed, and the embedding strength of the wooden beam, which can be a structural determining factor in the design of the column-beam joint structure, can be increased.

[0021] Also in this aspect, since the upper surfaces of one wooden beam and the pair of mounting blocks are flush with each other, the floor slab can be installed flatly and stably on the upper surfaces of the flush members, which is preferable because of excellent appearance design.

[0022] Further, another aspect of the column-beam joint structure according to the present invention is characterized in that a recess is provided below the end of the wooden beam, the lower surface of the recess and the lower surface of the mounting block are flush with each other, and the lower surface of the recess and the lower surface of the mounting block are placed on the bracket.

[0023] According to this aspect, in either the form in which one mounting block is disposed on one side of one wooden beam or the form in which a pair of mounting blocks are disposed on the left and right sides of one wooden beam, the lower surface of the recess provided below the end of the wooden beam and the lower surface of the mounting block are flush with each other, and the lower surface of the recess and the lower surface of the mounting block are placed on the bracket. Although only one wooden beam and one or a pair of mounting blocks are placed on the bracket, a stable mounting posture of the wooden beam can be formed by the engaging structure.

[0024] Also in this aspect, by making the lower surface of the bracket flush with the lower surface of the wooden beam in the engaged position, the ceiling board or the like can be installed flatly and stably with respect to the lower surfaces of the flush members, which is preferable because of its excellent appearance design.

[0025] Further, another aspect of the column-beam joint structure according to the present invention is characterized in that the placement block is a concrete block.

[0026] According to this aspect, since the placement block is a concrete block, in addition to increasing the pressure-receiving area of the member placed on the bracket, the concrete block with higher rigidity than the wooden beam is more likely to bear a large working load, and the settlement failure of the wooden beam can be further suppressed.

[0027] Here, the concrete block is, for example, a precast concrete block manufactured in a factory, and the concrete block and the wooden beam are joined by a fastener.

[0028] Further, another aspect of the column-beam joint structure according to the present invention is characterized in that a fastener is projected laterally from the side surface of the wooden beam, and the concrete block is formed by post-construction concrete so as to embed the fastener, and the concrete block and the wooden beam are joined.

[0029] According to this aspect, a fixture that protrudes laterally from the side surface of the wooden beam is embedded, and a concrete block is formed by the post - placed concrete placed in a post - construction manner. By joining the concrete block and the wooden beam, the wooden beam also functions as a formwork during concrete placement. Since the wooden beam does not require form removal, the concrete block and the wooden beam can be joined with high strength under good workability. Here, "post - placed concrete" means the concrete that is placed in the formwork after assembling a pair of wooden beams equipped with fixtures protruding laterally as formwork and further installing separate formwork at necessary locations. In addition to factory production, it includes on - site - made (or on - site - constructed) concrete.

[0030] Moreover, another aspect of the column - beam joint structure according to the present invention is characterized in that the fixture is any one of a lag screw bolt, a drift pin, a wood screw, a nail, a bolt, and a glue - in rod.

[0031] According to this aspect, various forms such as lag screw bolts and drift pins are applied as fixtures, and all can join the concrete block and the wooden beam with high strength. Here, a glue - in rod (GIR: Glue in rod) can also be called a glued - in rod (GIR: Glued in rod), which is a method of opening holes in a wooden member, inserting steel bars into the holes, filling the holes with a resin adhesive, and joining the members together. The fixture includes this combination of the resin adhesive and the steel bar.

[0032] Moreover, another aspect of the column - beam joint structure according to the present invention is characterized in that the placement block is a wooden block, and the wooden block and the wooden beam are joined by a fixture or an adhesive.

[0033] According to this aspect, since the mounting block is a wooden block, in addition to being able to increase the pressure-receiving area of the member mounted on the bracket, all of the wooden beam and the mounting block are wooden members, so the overall integrity is enhanced, and the appearance design can be further improved.

Effect of the Invention

[0034] As can be understood from the above description, regarding a column-beam joint structure in which a wooden beam is joined to a bracket that protrudes laterally from a column according to the column-beam joint structure of the present invention, it is possible to suppress or prevent the end of the wooden beam from bearing a bending moment, and it is possible to provide a column-beam joint structure with excellent attachability to the bracket.

Brief Description of the Drawings

[0035]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0036] Hereinafter, an example of a column-beam joint structure according to an embodiment will be described with reference to the accompanying drawings. In the present specification and the drawings, substantially the same components may be denoted by the same reference numerals, and redundant descriptions may be omitted.

[0037] [Column-beam joint structure according to the first embodiment] First, with reference to FIGS. 1 to 4, an example of a column-beam joint structure according to the first embodiment will be described. Here, FIG. 1 is a perspective view of an example of the column-beam joint structure according to the first embodiment, and FIG. 2 is an exploded perspective view of a column provided with a bracket and a laminated wood beam provided with a mounting block at an end, which form an example of the column-beam joint structure according to the first embodiment. Further, FIG. 3 is a cross-sectional view obtained by cutting the laminated wood beam and the mounting block at the position of the fastener, and is a view for explaining an example of the joint structure between the laminated wood beam and the mounting block, and FIG. 4 is a view corresponding to FIG. 3 and is a view for explaining another example of the joint structure between the laminated wood beam and the mounting block. Hereinafter, in each figure, the main bars, stirrups, etc. of the column 10 are not shown.

[0038] The column-beam joint structure 100 shown in FIG. 1 is formed by joining a laminated wood beam 30 in which a pair of wood beams 40 are provided side by side with a gap 45 to the upper surface 21 of a bracket 20 that projects laterally from the side surface 11 of the column 10. In the column-beam joint structure 100, the joining of the laminated wood beam 30 to the bracket 20 is not a strong joining in which the ends 44 of the pair of wood beams 40 that make up the laminated wood beam 30 bear the bending moment acting on the column-beam joint structure 100, but a form in which the lower surfaces 41 of the ends 44 of the pair of wood beams 40 are placed on the upper surface 21 of the bracket 20 is referred to as "joining".

[0039] Here, FIG. 1 shows an example in which the ends 44 of a pair of wood beams 40 that make up the laminated wood beam 30 are placed on a bracket 20 provided on one side surface 11 of a quadrangular column-shaped column 10, but brackets 20 may be similarly provided on the other one to three side surfaces, and the ends of other laminated wood beams 30 may be placed.

[0040] The column 10 and the bracket 20 in the illustrated example are both integral structures made of reinforced concrete. More specifically, they are PCa columns with brackets, which are manufactured in a factory and transported to the site. Here, in addition to being made of PCa reinforced concrete as in the illustrated example, the column 10 may also be made of reinforced concrete constructed on-site, steel, steel-reinforced concrete, concrete-filled steel tube (CFT), wood, etc., and the bracket may also be in other forms similar to the column.

[0041] Also, the wooden beam 40 that forms the combined wooden beam 30 is formed by laminating a number of veneer boards in a manner where the fiber directions are alternately orthogonal to each other and bonding them to each other. Here, in addition to being a laminate of veneer boards, the wooden beam 40 may also be cross-laminated timber (CLT) or laminated veneer lumber (LVL), etc.

[0042] Also, although not shown in the figures, in the region where a beam through-hole such as a duct sleeve is formed in the combined wooden beam 30, a first through-hole is formed at the corresponding locations of the pair of wooden beams 40, a wooden block having a second through-hole is disposed in the gap 45 between the pair of wooden beams 40, and the second through-hole communicates with the pair of first through-holes to form a beam through-hole.

[0043] As shown in FIGS. 1 and 2, a precast concrete block 50 (an example of a placement block) is disposed in the gap 45 between the ends 44 of the pair of wooden beams 40, and as shown in FIG. 3, they are joined to each other by a plurality of drift pins 61 (an example of a fastener) that penetrate the pair of wooden beams 40 and the precast concrete block 50. Here, in addition to drift pins, the applicable fasteners may also be wood screws, nails, etc., but from the perspective of being able to join with higher strength, the drift pins 61 in the illustrated example are preferable.

[0044] For example, pin holes are processed at a plurality of corresponding positions on both the wooden beam 40 and the mounting block 50. When the mounting block 50 is sandwiched between the ends 44 of a pair of wooden beams 40, the corresponding pin holes are communicated with each other, and a drift pin 61 is driven into each communication hole, whereby the laminated wooden beam 30 and the mounting block 50 are joined to form a joining unit.

[0045] In addition to the form shown in FIG. 3, there is, for example, a form shown in FIG. 4 for the joining form of the laminated wooden beam and the mounting block. Specifically, the tips of a plurality of lag screw bolts 63 are driven into the side surface 43 of the wooden beam 40, and a part of the lag screw bolts 63 is made to project laterally from the side surface 43.

[0046] A plurality of lag screw bolts 63 projecting from the side surfaces 43 of both ends of a pair of wooden beams 40 are opposed to each other, and in the gap 45 at the end 44 where the mounting block 50A is formed so as to mutually wrap a part of these lag screw bolts 63, block reinforcing bars 55 are arranged.

[0047] Using the side surfaces of the ends 44 of a pair of wooden beams 40 as formwork, and further installing formwork (not shown) at necessary outer locations where the mounting block 50A is formed, and placing post-cast concrete into the formwork, a post-cast concrete block 50A (another example of a mounting block) is fabricated, whereby the mounting block 50A and the laminated wooden beam 30 are joined. This form is also fabricated in a factory, and the fabricated joining unit of the laminated wooden beam 30 and the post-cast concrete block 50A is transported to the site.

[0048] Although not shown, precast concrete blocks 50, 50A are joined between a pair of wooden beams 40 at the other end of the laminated wooden beam 30. The joining unit of the laminated wooden beam 30 and the precast concrete blocks 50, 50A is fabricated at the factory, transported to the site, and then placed on the upper surface 21 of a bracket 20 projecting laterally from the side surface 11 of a PCa column 10 also transported to the site.

[0049] The lower surfaces 41 of each of the pair of wooden beams 40 and the lower surface 51 of the mounting block 50 are flush with each other. Similarly, the upper surfaces 42 of each of the pair of wooden beams 40 and the upper surface 52 of the mounting block 50 are also flush with each other.

[0050] Since the lower surfaces 41 of each of the pair of wooden beams 40 and the lower surface 51 of the mounting block 50 are flush with each other, both the lower surface 41 of the end portion 44 of the combined wooden beam 30 and the lower surface 51 of the mounting block 50 therebetween can be stably placed on the upper surface 21 of the bracket 20.

[0051] Also, since the upper surfaces 42 of each of the pair of wooden beams 40 and the upper surface 52 of the mounting block 50 are flush with each other, a floor slab (not shown) can be placed flat and stably. This floor slab includes various forms such as a PCa floor slab (a floor slab made of PCa reinforced concrete, a PCa prestressed concrete floor slab (PC floor slab)), a half-PCa floor slab and a PC composite floor slab of a site-constructed floor slab, an ALC (Autoclaved Lightweight aerated Concrete) panel, etc.

[0052] According to the column-beam joint structure 100, since the pair of wooden beams 40 forming the combined wooden beam 30 are placed on the bracket 20 with the mounting blocks 50, 50A sandwiched therebetween, it is only necessary to place the end portions 44 of the pair of wooden beams 40 and the mounting blocks 50, 50A on the bracket 20. Therefore, the attachability of the wooden beam 40 to the bracket 20 is improved. Due to the configuration in which the wooden beam 40 is placed in this way, the end portion 44 of the wooden beam 40 is suppressed or restrained from bearing a bending moment.

[0053] Furthermore, since the lower surfaces 41, 51 of the pair of wooden beams 40 and the mounting blocks 50, 50A disposed therebetween are placed on the bracket 20, the pressure-receiving area of the members placed on the bracket 20 can be increased as compared with the case where only the lower surface 41 of the pair of wooden beams 40 is placed. The embedment strength of the wooden beam 40, which can be a structural determining factor in the design of the column-beam joint structure 100, can be increased.

[0054] The column-beam joint structure 100 shown in Fig. 1 is a structure in which one end of the matched wooden beam 30 is joined to one column 10. However, in a building structure, for each bracket 20 of a pair of columns 10 erected with a predetermined span, both ends of the matched wooden beam 30 suspended by, for example, a crane or the like are placed thereon, whereby two column-beam joint structures 100 are formed simultaneously. And in a state where a floor slab is installed on the matched wooden beam 30, the column-beam joint structure 100 becomes a stable joint structure.

[0055] That is, even in a structure where the end of the matched wooden beam 30 is placed on the upper surface 21 of the bracket 20, ultimately a stable joint structure is obtained, and moreover, a joint structure can be formed in which the end of the matched wooden beam 30 does not bear all or almost all of the bending moment.

[0056] Also, since the column-beam joint structure 100 is formed simply by placing both ends of the matched wooden beam 30 on the upper surfaces 21 of the respective brackets 20 of the pair of columns 10, it becomes a column-beam joint structure with excellent workability (attachability).

[0057] Furthermore, by applying the wooden beam 40, it is possible to reduce the load on the environment. Due to its light weight, the handling and workability of the beam at the site are improved, and the excellent aesthetic design property created by the side surface 43 of the wooden beam 40 is achieved.

[0058] Here, although not shown in the drawings, pins protruding upward may be provided on the upper surface 21 of the bracket 20, and pin holes may be provided at corresponding positions on the lower surface 41 of the wooden beam 40 and the lower surfaces 51 of the mounting blocks 50, 50A, and the pins may be inserted into the pin holes.

[0059] Also, a steel plate may be fixed to the lower surface 41 of the end portion 44 of the wooden beam 40 so that the lower surface 41 of the end portion 44 is reinforced, and the lower surface 41 of the wooden beam 40 may be placed on the upper surface 21 of the bracket 20 via the steel plate. [Column-beam joint structure according to the second to fifth embodiments] Next, with reference to FIGS. 5 to 8, an example of the column-beam joint structure according to the second to fifth embodiments will be described. Here, FIGS. 5 to 8 are perspective views of the column-beam joint structures according to the second to fifth embodiments, respectively.

[0060] The column-beam joint structure 100A according to the second embodiment shown in FIG. 5 is different from the column-beam joint structure 100 shown in FIG. 1 in that a recess 47 is provided below the end portion 44 of a pair of wooden beams 40A, the lower surface 47a of the recess 47 and the lower surface 51 of the mounting block 50 are flush, and the lower surface 47a of the recess 47 and the lower surface 51 of the mounting block 50 are placed on the bracket 20.

[0061] According to the column-beam joint structure 100A, similar to the column-beam joint structure 100, the attachability of the wooden beam 40A to the bracket 20 is improved, the end portion 44 of the wooden beam 40A is suppressed or prevented from bearing the bending moment, and in addition to being able to increase the pressure-receiving area of the member placed on the bracket 20, although only a pair of wooden beams 40 and a mounting block 50 are placed on the bracket 20, a stable mounting posture of the joining wooden beam 30 can be formed by the engaging structure.

[0062] In the illustrated example, the lower surface 22 of the bracket 20 and the lower surfaces 41 of the pair of wooden beams 40 are flush in the engaged posture. With this configuration, a ceiling board or the like (not shown) can be installed flatly and stably on the lower surfaces 22 and 41 of the respective flush members.

[0063] On the other hand, the column-beam joint structure 100B according to the third embodiment shown in FIG. 6 is different from the column-beam joint structure 100A shown in FIG. 5 in that instead of arranging the mounting block 50 between a pair of wooden beams 40A, one precast concrete block 50B (another example of the mounting block) is arranged on one side of one wooden beam 40A.

[0064] For example, when it is desired to dispose only one wooden beam on the outdoor side with respect to the column 10 disposed on the outer periphery of the building from the viewpoints of various situations and the like, the column-beam joint structure 100B is suitable. Here, in the present embodiment, a wooden beam 40 without a recess 47 below the end portion 44 may be applied.

[0065] Also, with the column-beam joint structure 100B, the attachability of the wooden beam 40A to the bracket 20 is improved, the end portion 44 of the wooden beam 40A is suppressed or prevented from bearing the bending moment, the pressure receiving area of the member placed on the bracket 20 can be increased, and a stable placement posture of the wooden beam 40A can be formed by the engagement structure.

[0066] On the other hand, the column-beam joint structure 100C according to the fourth embodiment shown in FIG. 7 is different from the column-beam joint structure 100 shown in FIG. 1 in that, as a placement block disposed between the end portions 44 of the pair of wooden beams 40, a wooden block unit 50C (another example of the placement block) in which two wooden blocks 50C' are joined by adhesion or the like is applied instead of the precast concrete block 50. In the illustrated example, the pair of wooden beams 40 and the wooden block unit 50C are joined by the drift pins 61, but both may be joined by an adhesive.

[0067] Since all of the wooden beam and the placement block are wooden members, the overall integrity is enhanced, and the appearance design property can be further enhanced. Also, with the column-beam joint structure 100C, the attachability of the mating wooden beam 30 to the bracket 20 is improved, the end portion 44 of the wooden beam 40 is suppressed or prevented from bearing the bending moment, and the pressure receiving area of the member placed on the bracket 20 can be increased. Here, in the present embodiment, a wooden beam 40A having a recess 47 below the end portion 44 may be applied.

[0068] On the other hand, the column-beam joint structure 100D according to the fifth embodiment shown in FIG. 8 is different from the column-beam joint structure 100 shown in FIG. 1 in that a pair of precast concrete blocks 50 are arranged on the left and right of the end 44 of one wooden beam 40, instead of arranging the precast concrete block 50 between the ends 44 of a pair of wooden beams 40.

[0069] Also with the column-beam joint structure 100D, the attachability of the wooden beam 40 to the bracket 20 is improved, the end 44 of the wooden beam 40 is suppressed or prevented from bearing the bending moment, and the pressure-receiving area of the member placed on the bracket 20 can be increased. Here, in this embodiment, a wooden beam 40A provided with a recess 47 below the end 44 may be applied.

[0070] Other embodiments in which other components are combined with the configurations and the like described in the above embodiments may also be possible, and the present invention is not limited to the configurations shown here at all. In this regard, it can be changed without departing from the spirit of the present invention and can be appropriately determined according to the application form.

Explanation of Signs

[0071] 10: Column 11: Side surface 20: Bracket 21: Upper surface 22: Lower surface 30, 30A: Laminated wooden beam 40, 40A: Wooden beam 41: Lower surface 42: Upper surface 43: Side surface 44: End 45: Gap 47: Recess 47a: Lower surface 50: Placing block (precast concrete block) 50A: Placing block (post-construction concrete block) 50B: Placing block (precast concrete block) 50C: Mounting block (wooden block unit) 50C': Wooden block 50D: Mounting block (precast concrete block) 51: Bottom surface 52: Top surface 55: Reinforcing bar for block 61: Fastener (drift pin) 63: Fastener (lag screw bolt) 100, 100A, 100B, 100C, 100D: Column-beam joint structure

Claims

1. A column-beam joint structure in which a combined wooden beam, in which a pair of wooden beams are provided side by side with a gap therebetween and are joined to a bracket projecting from the side surface of a column, is joined, wherein a mounting block to be placed on the bracket is disposed between the pair of wooden beams and is joined to both of the wooden beams, and the lower surface of the mounting block and the lower surface of the end of the combined wooden beam are placed on the bracket,

2. The column-beam joint structure according to claim 1, wherein a recess is provided below the ends of the pair of wooden beams, the lower surface of the recess and the lower surface of the mounting block are flush with each other, and the lower surface of the recess and the lower surface of the mounting block are placed on the bracket.

3. A column-beam joint structure in which a wooden beam is joined to a bracket projecting from the side surface of a column, wherein a mounting block is disposed on one of the left and right sides of the wooden beam and is joined to the wooden beam, and the lower surface of the mounting block and the lower surface of the end of the wooden beam are placed on the bracket.

4. A column-beam joint structure in which a wooden beam is joined to a bracket projecting from the side surface of a column, wherein a pair of mounting blocks are disposed on the left and right sides of the wooden beam and are joined to the wooden beam, and the lower surfaces of the pair of mounting blocks and the lower surface of the end of the wooden beam are placed on the bracket.

5. The column-beam joint structure according to claim 3 or 4, wherein a recess is provided below the end of the wooden beam, the lower surface of the recess and the lower surface of the mounting block are flush with each other, and the lower surface of the recess and the lower surface of the mounting block are placed on the bracket.

6. The column-beam joint structure according to any one of claims 1 to 4, wherein the mounting block is a concrete block.

7. The column-beam joint structure according to claim 6, wherein a fixture is made to project laterally from the side surface of the wooden beam, and the concrete block is formed by post-construction concrete so as to embed the fixture, and the concrete block and the wooden beam are joined.

8. The column-beam joint structure according to claim 7, wherein the fixture is any one of a lag screw bolt, a drift pin, a wood screw, a nail, a bolt, and a glue-in rod.

9. The column-beam joint structure according to any one of claims 1 to 4, characterized in that the placement block is a wooden block, and the wooden block and the wooden beam are joined by a fastener or an adhesive.

Images