Compound beam and column-beam coupling structure

Abstract

According to the present invention, a plurality of beam members 11, 12 formed from wood material and having a longitudinal rectangular cross section are juxtaposed such that the surface on one side of

Description

Title of the Invention COUPLED BEAM AND BEAM-PILLAR CONNECTION STRUCTURE Technical Field

[0001] The present invention relates to a coupled beam formed by connecting a plurality of beam members each made of a wood material in the beam width direction, and also relates to a beam-pillar connection structure of a part where a pillar member is connected to an upper part of the coupled beam. Background Art

[0002] In order to realize a large span space or a large window opening in a wooden building, it is necessary to enhance the structural strength of the beam members. As means to solve the above problem, sometimes a beam member made of laminated wood having a large cross section is adopted. However, the productivity of the laminated wood with a large cross section is low, which results in a higher manufacturing cost. Furthermore, increase of the beam depth (height of the beam) decreases the ceiling height (size from the floor to the bottom of the beam) and thus requires to increase the height of the storey, which also leads to economic disadvantage.

[0003] As a technique to enhance the structural strength of the beam member while avoiding increase of the beam depth, a “coupled beam” is publicly known, in which two wood materials having a vertical rectangle cross section are connected in the beam width direction. The two beam members are generally connected to each other using screws or adhesive (see, for example, Patent Documents 1 and 2). Also, the “composite beam (built-up beam)” is publicly known, in which two wood materials are connected in the beam width direction using bolts and nuts in a state in which a plate made of steel material or a reinforcement material having a square tube shape is interposed between the two wood materials (see, for example, Patent Documents 3 and 4). Prior Art Documents Patent Documents

[0004] Patent Document 1: JP 2015-214832 A Patent Document 2: JP H05-340029 A Patent Document 3: JP 2015-098680 A Patent Document 4: JP 2013-014998 A Summary of the Invention Problem to Be Solved by the Invention

[0005] When connecting the two wood materials using screws so as to form the coupled beam, a number of screws are needed. Since the screw has a length approximately from two-third to three-fourth of the width of the coupled beam, the screw may come into contact with a knot of the wood, which often results in the bent or break of the screw. Also, the screw is unreliable in the bonding strength for a long period of time.

[0006] There is also a method for connecting two wood materials using adhesive so as to form the coupled beam. However, such a method takes time and effort, and thus has a low productivity. As a result, the method requires a high processing cost, which is not suitable for mass production. Furthermore, in this method using the adhesive, there are also concerns about reliability in the bonding strength for a long period of time, which causes difficulty in acquisition of an official certification.

[0007] The coupled beam is often subjected to pre-cut processing at end parts or an intermediate part thereof so as to be joined to another beam member or pillar member. However, pre-cut processing machines in general wood processing factories only can process the wood materials having the thickness of not more than 150 mm. Therefore, the two wood materials for forming the coupled beam are each pre-processed in advance, and then they are connected to each other. However, in such a case, when using the above-described two kinds of connection methods, it is difficult to achieve the machining accuracy after connecting.

[0008] There is also another method for connecting the two wood materials using bolts and nuts so as to form the coupled beam. However, in this method, a clearance is generated between a through hole formed in the wood material and a bolt, which decreases the initial stiffness against the load. In this case, the two wood materials cannot be considered as a structurally integrated body, and thus the cross-sectional efficiency in the structural design is degraded.

[0009] The invention disclosed in the present application was made in consideration of the above circumstances, a first object of which is to provide a coupled beam made of two wood materials for forming the coupled beam that are connected to each other simply and economically with a high accuracy, the bonding strength and the structural strength of which are maintained for a long period of time.

[0010] Furthermore, a second object of the invention disclosed in the present application is to provide a reasonable beam-pillar connection structure for accurately integrating connection parts of a coupled beam and a pillar member when the pillar member is erected on an upper side of an intermediate part of the coupled beam. Means for Solving the Problem

[0011] In order to achieve the above objects, the invention disclosed in the present application provides a coupled beam formed by connecting, in a beam width direction, a plurality of beam members each made of a wood material having a vertical rectangle cross section such that a side surface of each of the plurality of beam members that is juxtaposed comes into contact with each other without any gap along an entire member length of the plurality of beam members. A plurality of pin insertion holes is provided, at an appropriate interval, in each of the plurality of beam members that is juxtaposed such that the plurality of pin insertion holes penetrates the plurality of beam members in the beam width direction. The plurality of beam members is integrally connected to each other by inserting pin members each made of a rigid body respectively into the plurality of pin insertion holes.

[0012] Also, in the above-described coupled beam of the invention disclosed in the present application, both of the following are used as the pin members: drift pins that are inserted into the plurality of pin insertion holes; and bolts and nuts that are used for the plurality of pin insertion holes such that the coupled beam is fastened from both sides. Out of a total number of the pin members used for the coupled beam, not less than three-fourth are the drift pins, and the rest are the bolts and nuts.

[0013] In this way, the coupled beam made by connecting, by the pin members, the plurality of beam members juxtaposed without any gap can be manufactured easily and accurately at low cost. By adopting the drift pins as the pin members, the plurality of beam members is tightly connected with high accuracy, which leads to long-term durability and high reliability of the bonding strength. In the coupled beam made of the plurality of beam members thus structurally integrated, such beam members response to an applied load together with each other without degrading the initial stiffness, and equally share the load and equally deform.

[0014] Also, in a beam-pillar connection structure of the invention disclosed in the present application, a pillar member made of a wood material having a rectangle cross section is erected on an upper side of at least one intermediate part of the coupled beam as described above so that the coupled beam and the pillar member is connected to each other, via a connection member made of a rigid body, to have an inverted T shape. The connection member includes: a hollow cylinder-shaped or a columnshaped beam member connection part that is embedded in an inside of the coupled beam from above; and a hollow cylinder-shaped, a columnshaped or a plate-shaped pillar base connection part that is embedded in a lower end part of the pillar member from below. The beam member connection part is integrally connected to the plurality of beam members forming the coupled beam by inserting pin members each made of a rigid body respectively into a plurality of pin insertion holes that penetrates, in the beam width direction, the coupled beam at a position where the beam member connection part is embedded. The pillar base connection part is connected to the pillar member by inserting pin members each made of a rigid body respectively into a plurality of pin insertion holes that penetrates, in a direction intersecting the member axis of the pillar member, the pillar member at a position where the pillar base connection part is embedded.

[0015] The beam-pillar connection structure may also be characterized in that: the pillar member is erected such that the member axis thereof is offset along the beam width direction of the coupled beam; and the beam member connection part is embedded in an inside of at least one beam member out of the plurality of beam members forming the coupled beam, in which the at least one beam member is located directly below the pillar member, so that the pillar member is connected to the at least one beam member together with the rest of the plurality of beam members forming the coupled beam.

[0016] The beam-pillar connection structure may also be characterized in that: the connection member is provided with a plurality of beam member connection parts; the plurality of beam member connection parts is respectively embedded in insides of the plurality of beam members including the at least one beam member located directly below the pillar member; and the plurality of beam member connection parts is integrally connected to the pillar base connection part via a connection plate made of a rigid body, in which the connection plate is interposed between respective connection surfaces of the coupled beam and the pillar member.

[0017] The beam-pillar connection structure may also be characterized in that: the pillar member is erected such that a strong axis direction of a rectangle cross section of the pillar member is along the beam width direction of the coupled beam, and the pillar base connection part is constituted of at least one plate-like body that is erected on the connection plate along the strong axis direction of the pillar member.

[0018] The beam-pillar connection structure may also be characterized in that: the width of the pillar base connection part is formed so as not to exceed the cross-sectional size of the pillar member in the strong axis direction.

[0019] With the above-described configurations, it is possible to tightly connect a coupled beam to a pillar member that is erected thereon. Effects of the Invention

[0020] A coupled beam made by connecting, by pin members, a plurality of beam members juxtaposed without any gap can be manufactured easily and accurately at low cost. By adopting drift pins as the pin members, the plurality of beam members is tightly connected with high accuracy, which leads to long-term durability and high reliability of the bonding strength. In the coupled beam made of the plurality of beam members thus structurally integrated, such beam members response to an applied load together with each other without degrading the initial stiffness, and equally share the load and equally deform.

[0021] Furthermore, in a beam-pillar connection structure in which a pillar member is connected to an upper part of the coupled beam as described above, the coupled beam is tightly integrated with the pillar member via a connection member and pin members. Therefore, even when an eccentric load is applied to the coupled beam, it is possible to stably support the eccentric load. Brief Description of the Drawings

[0022] [FIG. 1] FIG. 1 is a cross-sectional view of a coupled beam in a direction orthogonal to a member axis direction according to an embodiment of the invention disclosed in the present application. [FIG. 2] FIG. 2 is a perspective view illustrating a beam-pillar frame using the coupled beam shown in FIG. 1. [FIG. 3] FIG. 3 is a cross-sectional view illustrating a beam-pillar connection structure in a circled part A of FIG. 2. [FIG. 4] FIG. 4 is a cross-sectional view illustrating a beam-pillar connection structure in a circled part B of FIG. 2. [FIG. 5] FIG. 5 is a perspective view illustrating a connection member used in the circled part B. Mode for Carrying Out the Invention

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] <Coupled Beam> FIG. 1 is a cross-sectional view of a coupled beam 1 in a direction orthogonal to a member axis direction according to an embodiment of the invention disclosed in the present application. The coupled beam 1 is made by: placing, side by side, two beam members 11 and 12 each made of a wood material having a vertical rectangle cross section such that one side surface of each of the beam members 11 and 12 comes into contact with each other; and connecting the beam members 11 and 12 in the beam width direction. The two beam members 11 and 12 are made of the same material, and also have the same length and the same cross-sectional size. For the sake of explanation, hereinafter the height of the beam members 11 and 12 is represented by “H”, and the width of the beam members 11 and 12 is represented by “W”. As the material of the beam members 11 and 12, it is possible to use, apart from solid wood generally used as a structural material of a building: laminated wood (structural glued laminated wood determined by the Japanese Agricultural Standards (JAS)); cross laminated timber (CLT); laminated veneer lumber (LVL); resin-impregnated wood; composite material (hybrid laminated wood) made by layering laminated wood for bearing the load to noncombustible covering material; and other wood materials.

[0025] The two beam members 11 and 12 are juxtaposed without any other reinforcement material or the like being interposed therebetween such that one side surface of each of the beam members 11 and 12 comes into contact with each other without any gap along the entire member length. The beam members 11 and 12 are provided with a plurality of pin insertion holes 13 at respectively corresponding positions such that the pin insertion holes 13 straightly penetrate the juxtaposed beam members 11 and 12 in the beam width direction. In the example as shown in FIG. 2, a plurality sets of pin insertion holes 13 is formed in each of the beam members 11 and 12 at predetermined intervals in the member length. The pin insertion holes of each set of pin insertion holes 13 line up vertically at a substantially even interval. However, the arrangement of the pin insertion holes 13 is not limited thereto. The pin insertion holes 13 may be arranged, for example, in a grid manner or in a staggered manner (zig-zag manner).

[0026] Into each of the pin insertion holes 13, a pin member 2 made of a rigid body such as steel material is inserted so as to integrally connect the beam members 11 and 12. As the pin member 2, both a drift pin 21 and a set of bolt and nut 22 (see FIGS. 2 to 4) are used. The drift pin 21 is inserted into the pin insertion hole 13 from the side surface of the beam member 11 or 12 by being lightly hammered. In the case of the bolt and nut 22, the two beam members 11 and 12 are fastened from both sides by inserting the bolt into the pin insertion hole 13 from one side surface of the beam member 11 or 12 and tightening the nut from the opposite side surface. In the parts where the bolts and nuts 22 are inserted and fastened, counterbores may be formed so as to put the heads of the bolts and the nuts in the side surfaces of the beam members 11 and 12. As an example of the pin member 2, it is possible to use, apart from various alloys, carbon fiber reinforced plastics (CFRP).

[0027] In the present invention, out of all the pin members 2 inserted into one pair of beam members 11 and 12 to make one coupled beam 1, the majority (as a standard, not less than 3 / 4) of them are the drift pins 21. The small numbers of pin members 2 as the rest are the bolts and nuts 22. In this way, the coupled beam 1 made by connecting the two beam members 11 and 12 using mainly the drift pins 21 can be easily manufactured in the general wood processing factory in a short time. Since the hole drilling accuracy is easily ensured, the productivity becomes high while the manufacturing cost is reduced. The drift pin 21 is inserted in order to fit into the pin insertion hole 13 with almost no gap, and thus desirable frictional force is generated between the drift pin 21 and the pin insertion hole 13, which leads to tight connection of the two beam members 11 and 12 with high accuracy. Since the drift pin 21 is less bendable and less breakable than the screw, the number of the drift pins 21 to be used is smaller than the number of screws to be used. Furthermore, the drift pin 21 has excellent durability compared to the screw and the bolt and nut 22, which leads to high reliability of the longterm bonding strength. Furthermore, the drift pin 21 also has excellent reusability at the time of dismantling.

[0028] In the coupled beam 1 made of thus structurally integrated two beam members 11 and 12, the two beam members 11 and 12 response to an applied load together with each other without degrading the initial stiffness, and equally share the load and equally deform. Thus, even when the eccentric load (the load biased in the beam width direction) is applied to the coupled beam 1, it is possible to stably support the eccentric load without generating a gap between the two beam members 11 and 12 or twisting the entire coupled beam 1. Note that the coupled beam 1 can be made of three or more beam members connected in the beam width direction in the same manner as described above.

[0029] <Beam-Pillar Connection Structure> FIG. 2 shows an example of a beam-pillar frame in which the eccentric load is applied to the above-described coupled beam 1. In this beampillar frame, a coupled pillar 30, which is made by connecting two pillar members 31 and 31 each made of a wood material having a rectangle cross section, is erected on four corners of a structure plane having an elongated rectangle shape in plan view. Between the respective pairs of pillars 31 in the long-side direction, two pairs of coupled beams 1 are bridged in parallel with each other. In the present invention, the detailed configuration of the coupled pillar 30 as well as the connection structure of the coupled pillar 30 and the coupled beam 1 are not particularly limited.

[0030] On an upper side of an intermediate part of the coupled beam 1 on the front left side of FIG. 2 (i.e. in the oval shape circled part A), a pillar member 32 made of a wood material having a square cross section is erected. Also, on an upper side of an intermediate part of the coupled beam 1 on the back right side of FIG. 2 (i.e. in the oval shape circled part B), a pillar member 33 made of a wood material having a non-square rectangle cross section is erected. These parts are inverted T-shaped beam-pillar connection parts, under which no pillar members are provided to support the coupled beam 1. Hereinafter, the connection structures of the respective coupled beams 1 and the pillar members 32 and 33 at the above-described parts will be described.

[0031] FIG. 3 is a cross-sectional view of the circled part A. The pillar member 32 erected on this part is a member having a square cross section, each side of which equals the width (W) of one of the beam members 11 and 12 forming the coupled beam 1. The member axis of the pillar member 32 is offset along the beam width direction of the coupled beam 1 so that the pillar member 32 is on the only one beam member 11 out of the two beam members 11 and 12 forming the coupled beam 1.

[0032] At this part, the coupled beam 1 and the pillar member 32 are joined by a hollow cylinder-shaped or a column-shaped connection member 4A made of a rigid body such as steel material. The connection member 4A is a member similar to the so-called “tenon pipe”, in which a beam member connection part 41 as the lower half part to be embedded in the coupled beam 1 and a pillar base connection part 42A as the upper half part to be embedded in the lower end part of the pillar member 32 are continuously integrated with each other. The beam member connection part 41 and the pillar base connection part 42A respectively have a plurality of pin insertion holes 43 and 44, which penetrate the connection member 4A in a direction orthogonal to the member axis direction of the connection member 4A. The connection member 4A can also be made of, apart from various alloys, carbon fiber reinforced plastics (CFRP).

[0033] The beam member 11 as one of the two component members forming the coupled beam 1 has a bottomed vertical hole 14 formed in a center of the beam width so that the beam member connection part 41 is embedded in this bottomed vertical hole 14 from above. Furthermore, the pin insertion holes 13 are formed so as to penetrate the beam member 11 in the beam width direction while intersecting the central axis of the vertical hole 14. The pin insertion holes 13 are formed such that their respective heights are each coincident with the height of the corresponding one of the pin insertion holes 43 formed in the beam member connection part 41. These pin insertion holes 13 penetrate also the beam member 12 as the other component member on which the pillar member 32 is not erected. Thus, the beam member connection part 41 is embedded in the vertical hole 14, and then the pin members 2 are inserted into the respective pin insertion holes 13 and 43 that penetrate the beam member connection part 41 and the two beam members 11 and 12. In this way, the connection member 4A is integrally connected to the two beam members 11 and 12 forming the coupled beam 1.

[0034] In the example, the bolts and nuts 22 are used to be inserted into and fasten the pin insertion holes 13 and 43 that penetrate the beam member connection part 41. However, all or part of the pin members 2 inserted into these parts may be replaced with the drift pins 21. Also in the example, the plurality of pin insertion holes 13 is arranged, under the vertical hole 14, in the vertical direction at an even interval, and the drift pins 21 are inserted into these pin insertion holes 13. However, these pin insertion holes 13 are not necessarily required to be arranged directly below the connection member 4A. Furthermore, the bolt and nut 22 may be used for some of these pin insertion holes 13.

[0035] The pillar member 32 has, in the lower end part thereof, a bottomed vertical hole 34 located at a position coincident with the member axis of the pillar member 32 so that the pillar base connection part 42A of the connection member 4A is embedded in this bottomed vertical hole 34 from below. Furthermore, the pin insertion holes 35 are formed so as to penetrate the pillar member 32 while intersecting the central axis of the vertical hole 34. The pin insertion holes 35 are formed such that their respective heights are each coincident with the height of the corresponding one of the pin insertion holes 44 formed in the pillar base connection part 42A. Thus, the pillar base connection part 42A is embedded in the vertical hole 34 of the pillar member 32, and then the pin members 2 are inserted into the respective pin insertion holes 44 and 35 that penetrate the pillar base connection part 42A and the pillar member 32. In this way, the connection member 4A is also integrally connected to the pillar member 32. In the example, the drift pins 21 are inserted into the pin insertion holes 44 that penetrate the pillar base connection part 42A. However, all or part of the pin members 2 used for these parts may be replaced with the bolts and nuts 22. Also in the example, the pin insertion holes 44 and 35 of the pillar member 32 are formed in parallel with the pin insertion holes 13 of the coupled beam 1. However, the pin insertion holes 44 and 35 of the pillar member 32 may be formed so as to intersect the pin insertion holes 13 of the coupled beam 1.

[0036] By cooperation of the connection member 4A with the pin members 2, it is possible to structurally integrate the two beam members 11 and 12 forming the coupled beam 1, and the pillar member 32 erected on the beam member 11 as one of the two components constituting the coupled beam 1.

[0037] FIG. 4 is a cross-sectional view of the circled part B. The pillar member 33 erected on this part has a non-square rectangle cross section. The cross-sectional size (short side size) of the pillar member 33 in the weak axis direction is substantially equal to the width (W) of the beam member 11 as one of the components constituting the coupled beam 1, and the cross-sectional size (long side size) thereof in the strong axis direction is larger than the width (V\ / ) of the beam member 11 as the one component and furthermore is smaller than the total width (2W) of the coupled beam 1. The pillar member 33 is located to be offset along the beam width direction such that the strong axis direction (long side direction) of the cross section is along the beam width direction of the coupled beam 1 while the one side surface of the pillar member 33 is aligned on the same surface of one side surface of the coupled beam 1. In this way, the more of half part of the lower end surface of the pillar member 33 is disposed on the beam member 11 as one component constituting the coupled beam 1, while a part of the lower end surface of the pillar member 33 is disposed on the beam member 12 as the other component.

[0038] At this part, the coupled beam 1 and the pillar member 33 are joined by a connection member 4B as shown in FIG. 5. The connection member 4B is also made of a rigid body such as steel material. The connection member 4B is provided with: a connection plate 45 having a rectangle shape in plan view; two beam member connection parts 41 each having a hollow cylinder shape or a column shape and being connected to the bottom surface of the connection plate 45; and a pillar base connection part 42B erected on the top surface of the connection plate 45. The connection plate 45 has a short side size that is substantially equal to the width (W) of the beam member 11 / 12, and a long side size that is equal to the total width (2W) of the coupled beam 1.

[0039] The two beam member connection parts 41 and 41 have the same external diameter and also the same length. They are located under the central line of the connection plate 45 in the longitudinal direction. The two beam member connection parts 41 and 41 are disposed so that their central axes are located at respective positions each shifted by half the width of the beam member 11 / 12 (i.e. 1 / 2 W) toward the inside from the respective short sides of the connection plate 45. The two beam member connection parts 41 and 41 each have a plurality of pin insertion holes 43 that penetrates the respective beam member connection parts 41 and 41 in a direction parallel to the long side direction of the connection plate 45.

[0040] The pillar base connection part 42B is a plate-like body that is erected on the central line of the connection plate 45 along the longitudinal direction so as to orthogonally intersect the connection plate 45. The width of the pillar base connection part 42B is the same as the cross-sectional size of the pillar member 33 in the strong axis direction, and the erected height thereof is not less than the cross-sectional size of the pillar member 33 in the weak axis direction. The pillar base connection part 42B has also a plurality of pin insertion holes 44.

[0041] The two beam members 11 and 12 forming the coupled beam 1 respectively have the bottomed vertical holes 14 each formed in a center of the beam width of the corresponding beam member 11 or 12 so that the beam member connection parts 41 of the connection member 4B are embedded in the respective bottomed vertical holes 14. Furthermore, the pin insertion holes 13 are formed in the beam members 11 and 12 so as to penetrate them in the beam width direction while intersecting the central axes of the vertical holes 14. The pin insertion holes 13 are formed such that their respective heights are each coincident with the height of the corresponding one of the plurality of pin insertion hole 43 formed in the beam member connection parts 41. Thus, the two beam member connection parts 41 and 41 are embedded in the respective vertical holes 14 and 14 of the beam members 11 and 12, and then the pin members 2 are inserted into the respective pin insertion holes 43 and 13 that penetrate the beam member connection parts 41 and 41, and the two beam members 11 and 12. In this way, the connection member 4B is integrally connected to the two beam members 11 and 12 forming the coupled beam 1.

[0042] In the example, the bolts and nuts 22 are used so as to be inserted into and fasten the pin insertion holes 43 and 13 that penetrate the beam member connection parts 41. However, all or part of the pin members 2 inserted into these parts may be replaced with the drift pins 21. Also in the example, the plurality of pin insertion holes 13 is arranged, under the vertical holes 14, in the vertical direction at an even interval, and the drift pins 21 are inserted into these pin insertion holes 13. However, these pin insertion holes 13 are not necessarily required to be arranged directly below the connection member 4B. Furthermore, the bolt and nut 22 may be used for some of these pin insertion holes 13.

[0043] The pillar member 33 has, in the lower end part thereof, a slit 36 formed on the central line of the pillar member 33 in the strong axis direction. The pillar base connection part 42B of the connection member 4B is inserted into this slit 36. Furthermore, the pin insertion holes 35 are formed so as to penetrate the pillar member 33 in the weak axis direction while intersecting the slit 36. The pin insertion holes 35 are located so as to be respectively coincident with the positions of the plurality of pin insertion holes 44 formed in the pillar base connection part 42B. Thus, the pillar base connection part 42B is inserted into the slit 36 of the pillar member 33, and then the pin members 2 are inserted into the respective pin insertion holes 44 and 35 that penetrate the pillar base connection part 42B and the pillar member 33. In this way, the connection member 4B is also integrally connected to the pillar member 33. In the example, the drift pins 21 are inserted into the pin insertion holes 44 and 35 that penetrate the pillar base connection part 42B. However, all or part of the pin members 2 used for these parts may be replaced with the bolts and nuts 22.

[0044] In the connection member 4B, the two beam member connection parts 41 and 41 respectively embedded in the two beam members 11 and 12 are integrally connected to the pillar base connection part 42B inserted into the pillar member 33 via the connection plate 45 interposed between the respective connection surfaces of the coupled beam 1 and the pillar member 33. By cooperation of the connection member 4B with the pin members 2, it is possible to structurally integrate: the two beam members 11 and 12 forming the coupled beam 1; and the pillar member 33 erected on the beam members 11 and 12 in a manner of straddling them.

[0045] Also in the connection member 4B, the width of the pillar base connection part 42B is formed so as not to exceed the cross-sectional size of the pillar member 33 in the strong axis direction. Thus, it is possible to prevent the pillar base connection part 42B from interfering with other members to be attached to the surrounding of the lower end part of the pillar member 33.

[0046] Furthermore, the beam-pillar connection structure adopted in the circled part B may be applied, without any problem, to a connection structure where the cross-sectional size of the pillar member 33 in the strong axis direction is coincident with the total width (2W) of the coupled beam 1 so that the uniform load is applied to the coupled beam 1 in the beam width direction. In this connection structure, the width of the pillar base connection part 42B is matched to the total width (2\N) of the coupled beam 1.

[0047] Furthermore, in the beam-pillar connection structure adopted in the circled part B, the pillar base connection part may be formed by erecting a plurality of plate-like bodies on the connection plate 45 at an appropriate interval. In this case, the same number of slits as the plate-like bodies may be formed in the lower end part of the pillar member 33, or a lower end part of the pillar member 33 may be interposed between the facing plate-like bodies, so that the pillar member 33 is connected.

[0048] The technical scope of the invention disclosed in the present application should not be limitedly interpreted by the foregoing embodiments, but should be conceptually interpreted by the scope of the appended claims. The names of the elements in the scope of the appended claims and the description are simply used for the sake of specific comprehensibility of the invention, therefore the concept and properties of the elements should not be excessively limited by these names. As to the members not specifically identified in the scope of the appended claims, all modifications and changes may be appropriately made to the shape, size, structure, material, and number thereof, or the connecting state and relative positional relationship thereof when implementing the invention disclosed in the present application, provided that such modifications and changes are made within the range where the operating principles are substantially equivalent to the foregoing embodiments and where the functions and effects are substantially equal to or greater than the foregoing embodiments.

[0049] The embodiments and others described in this disclosure can be also comprehended as the technical ideas indicated in the clauses below.

[0050] -Clause 1- A coupled beam formed by connecting, in a beam width direction, a plurality of beam members each made of a wood material having a vertical rectangle cross section such that a side surface of each of the plurality of beam members that is juxtaposed comes into contact with each other without any gap along an entire member length of the plurality of beam members, wherein a plurality of pin insertion holes is provided, at an appropriate interval, in each of the plurality of beam members that is juxtaposed such that the plurality of pin insertion holes penetrates the plurality of beam members in the beam width direction, and the plurality of beam members is integrally connected to each other by inserting pin members each made of a rigid body respectively into the plurality of pin insertion holes.

[0051] -Clause 2- The coupled beam according to Clause 1, wherein as the pin members, both of the following are used: drift pins that are inserted into the plurality of pin insertion holes; and bolts and nuts that are used for the plurality of pin insertion holes such that the coupled beam is fastened from both sides, and out of a total number of the pin members used for the coupled beam, not less than two-third are the drift pins, and the rest are the bolts and nuts.

[0052] -Clause 3- A beam-pillar connection structure in which a pillar member made of a wood material having a rectangle cross section is erected on an upper side of at least one intermediate part of the coupled beam according to Clause 1 or 2 so that the coupled beam and the pillar member is connected to each other, via a connection member made of a rigid body, to have an inverted T shape, wherein the connection member includes: a hollow cylinder-shaped or a column-shaped beam member connection part that is embedded in an inside of the coupled beam from above; and a hollow cylinder-shaped, a column-shaped or a plate-shaped pillar base connection part that is embedded in a lower end part of the pillar member from below, the beam member connection part is integrally connected to the plurality of beam members forming the coupled beam by inserting pin members each made of a rigid body respectively into a plurality of pin insertion holes that penetrates, in the beam width direction, the coupled beam at a position where the beam member connection part is embedded, and the pillar base connection part is connected to the pillar member by inserting pin members each made of a rigid body respectively into a plurality of pin insertion holes that penetrates, in a direction intersecting a member axis of the pillar member, the pillar member at a position where the pillar base connection part is embedded.

[0053] -Clause 4- The beam-pillar connection structure according to Clause 3, wherein the pillar member is erected such that the member axis thereof is offset along the beam width direction of the coupled beam, and the beam member connection part is embedded in an inside of at least one beam member out of the plurality of beam members forming the coupled beam, in which the at least one beam member is located directly below the pillar member, so that the pillar member is connected to the at least one beam member together with the rest of the plurality of beam members forming the coupled beam.

[0054] -Clause 5- The beam-pillar connection structure according to Clause 4, wherein the connection member is provided with a plurality of beam member connection parts, the plurality of beam member connection parts is respectively embedded in insides of the plurality of beam members including the at least one beam member located directly below the pillar member, and the plurality of beam member connection parts is integrally connected to the pillar base connection part via a connection plate made of a rigid body, and the connection plate is interposed between respective connection surfaces of the coupled beam and the pillar member.

[0055] -Clause 6- The beam-pillar connection structure according to Clause 5, wherein the pillar member is erected such that a strong axis direction of a rectangle cross section of the pillar member is along the beam width direction of the coupled beam, and the pillar base connection part is constituted of at least one platelike body that is erected on the connection plate along the strong axis direction of the pillar member.

[0056] -Clause 7- The beam-pillar connection structure according to Clause 6, wherein a width of the pillar base connection part is formed so as not to exceed a cross-sectional size of the pillar member in the strong axis direction. Industrial Applicability

[0057] The invention disclosed in the present application can be widely applied to building frames of the wood structure. Description of the Reference Numerals

[0058] 1 Coupled beam 11 Beam member 12 Beam member 13 Pin insertion hole 14 Vertical hole 2 Pin member 21 Drift pin 22 Bolt and nut 30 Coupled pillar 31 Pillar member 32 Pillar member 33 Pillar member 34 Vertical hole 35 Pin insertion hole 36 Slit 4A, 4B Connection member 41 Beam member connection part 42A, 42B Pillar base connection part 43 Pin insertion hole 44 Pin insertion hole 45 Connection plate 19 03 25

Claims

1. A coupled beam formed by connecting, in a beam width direction, a 5 plurality of beam members each made of a wood material having a vertical rectangle cross section such that a side surface of each of the plurality of beam members that is juxtaposed comes into contact with each other without any gap along an entire member length of the plurality of beam members, wherein10 a plurality of pin insertion holes is provided, at an appropriateinterval, in each of the plurality of beam members that is juxtaposed such that the plurality of pin insertion holes penetrates the plurality of beam members in the beam width direction, andthe plurality of beam members is integrally connected to each 15 other by inserting pin members each made of a rigid body respectively into the plurality of pin insertion holes.

2. The coupled beam according to claim 1, wherein20 as the pin members, both of the following are used: drift pins thatare inserted into the plurality of pin insertion holes; and bolts and nuts that are used for the plurality of pin insertion holes such that the coupled beam is fastened from both sides, andout of a total number of the pin members used for the coupled 25 beam, not less than two-third are the drift pins, and the rest are the bolts and nuts.

3. A beam-pillar connection structure in which a pillar member made 30 of a wood material having a rectangle cross section is erected on an19 03 25upper side of at least one intermediate part of the coupled beam according to claim 1 or 2 so that the coupled beam and the pillar member is connected to each other, via a connection member made of a rigid body, to have an inverted T shape, wherein5 the connection member includes: a hollow cylinder-shaped or acolumn-shaped beam member connection part that is embedded in an inside of the coupled beam from above; and a hollow cylinder-shaped, a column-shaped or a plate-shaped pillar base connection part that is embedded in a lower end part of the pillar member from below,10 the beam member connection part is integrally connected to theplurality of beam members forming the coupled beam by inserting pin members each made of a rigid body respectively into a plurality of pin insertion holes that penetrates, in the beam width direction, the coupled beam at a position where the beam member connection part is embedded,15 andthe pillar base connection part is connected to the pillar member by inserting pin members each made of a rigid body respectively into a plurality of pin insertion holes that penetrates, in a direction intersecting a member axis of the pillar member, the pillar member at a position where20 the pillar base connection part is embedded.

4. The beam-pillar connection structure according to claim 3, wherein the pillar member is erected such that the member axis thereof is25 offset along the beam width direction of the coupled beam, andthe beam member connection part is embedded in an inside of at least one beam member out of the plurality of beam members forming the coupled beam, in which the at least one beam member is located directly below the pillar member, so that the pillar member is connected to the at30 least one beam member together with the rest of the plurality of beam19 03 25members forming the coupled beam.

5. The beam-pillar connection structure according to claim 4, wherein5 the connection member is provided with a plurality of beammember connection parts,the plurality of beam member connection parts is respectively embedded in insides of the plurality of beam members including the at least one beam member located directly below the pillar member, and10 the plurality of beam member connection parts is integrallyconnected to the pillar base connection part via a connection plate made of a rigid body, and the connection plate is interposed between respective connection surfaces of the coupled beam and the pillar member.15

6. The beam-pillar connection structure according to claim 5, wherein the pillar member is erected such that a strong axis direction of a rectangle cross section of the pillar member is along the beam width direction of the coupled beam, and20 the pillar base connection part is constituted of at least one platelike body that is erected on the connection plate along the strong axis direction of the pillar member.

7. 25 The beam-pillar connection structure according to claim 6, whereina width of the pillar base connection part is formed so as not to exceed a cross-sectional size of the pillar member in the strong axis direction.INTERNATIONAL SEARCH REPORT International application No. PCT / JP2023 / 032498A. CLASSIFICATION OF SUBJECT MATTER E04C3 / 18(2006.01)1; E04B l / SS(2006.01)i FI: E04C3 / 18; E04B1 / 58 509E; E04B1 / 58 507L According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) E04C3 / 12-3 / 18: E04B1 / 58 Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Published examined utility model applications of Japan 1922-1996 Published unexamined utility model applications of Japan 1971-2023 Registered utility model specifications of Japan 1996-2023 Published registered utility model applications of Japan 1994-2023 Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. X Y A Y A JP 2020-7770 A (OHBAYASHI CORP.) 16 January 2020 (2020-01-16) paragraph [0020], [0026], fig. 1 paragraph [0020], [0026], fig. 1 paragraph [0020], [0026], fig. 1 JP 2019-167766 A (NIPPON STEEL METAL PRODUCTS CO., LTD.) 03 October 2019 (2019-10-03) paragraph [0041] paragraph [0041] 1 2 3-7 2 3-7 A JP 2003-239453 A (SEKISUI HOUSE LTD.) 27 August 2003 (2003-08-27) entire text, all drawings 3-7 A JP 2002-356917 A (SEKISUI HOUSE LTD.) 13 December 2002 (2002-12-13) entire text, all drawings 3-7 | | Further documents are listed in the continuation of Box C. | / | See patent family annex. * Special categories of cited documents: “T” later document published after the international filing date or priority “A” document defining the general state of the art which is not considered date and not in conflict with the application but cited to understand the to be of particular relevance principle or theory underlying the invention “E" earlier application orpatent but published on or after the international -‘X” document of particular relevance; the claimed invention cannot be filing date considered novel or cannot be considered to involve an inventive step “L” document which may throw doubts on priority claim(s) or which is when the document is taken alone cited to establish the publication date of another citation or other “y document of particular relevance; the claimed invention cannot be special reason (as specified) considered to involve an inventive step when the document is “O” document referring to an oral disclosure, use, exhibition or other combined with one or more other such documents, such combination means being obvious to a person skilled in the ait “P” document published prior to the international filing date but later than document member of the same patent family the priority date claimed Date of the actual completion of the international search 27 September 2023 Date of mailing of the international search report 10 October 2023 Name and mailing address of the ISA / JP Japan Patent Office (ISA / JP) 3-4-3 Kasumigaseki, Chiyoda-ku. Tokyo 100-8915 Japan Authorized officer Telephone No.INTERNATIONAL SEARCH REPORT Information on patent family membersInternational application No.PCT / JP2023 / 032498Patent document cited in search report Publication date (day / month / year) Patent family member: s) Publication date (day / month / year) JP 2020-7770 A 16 January 2020 (Family: none) JP 2019-167766 A 03 October 2019 (Family: none) JP 2003-239453 A 27 August 2003 (Family: none) JP 2002-356917 A 13 December 2002 (Family: none)

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