Joint structure of wooden column unit and steel frame beam

Abstract

To provide a joint structure of a wooden column unit and a steel frame beam which has a wooden column unit of high rigidity, and in which intensity of a joint part for joining the wooden column unit and the steel frame beam is high.SOLUTION: In a joint structure 100 of wooden column units 50, 60A, 60B and steel frame beams 80A, 80B, 80C, the wooden column unit includes: rectangular parallelepiped wooden columns 10, 10A; steel boxes 20, 20A disposed at respective cutouts 15 at four corner parts of the wooden column; and a tendon 30 inserted in a through-opening 17 for connecting the two upper and lower steel boxes in the wooden column. In a state of the tendon 30 being strained, the wooden column unit is fixed to a fixing tool 35 inside the upper and lower steel boxes, and by each wooden column unit and steel frame beam being bolt-joined, the plurality of wooden column units and the steel frame beams form a cross shape.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a joint structure between a wooden column unit and a steel beam.

Background Art

[0002] In the building structure (building frame), in addition to the frame composed of columns and beams of the same material such as a wooden frame formed by wooden columns and wooden beams, or a steel frame formed by steel columns and steel beams, there is also a frame of a hybrid structure (hybrid frame) formed by wooden columns and steel beams. Instead of making both the columns and beams of steel construction, by applying wooden columns, a building frame can be formed that has high rigidity due to steel and various effects exerted by wood. Also, compared to a wooden frame formed by wooden columns and wooden beams, the plastic deformation ability of the building frame during an earthquake is increased.

[0003] Specific examples of the effects when applying wood are as follows. Wood is lighter than steel, concrete, etc., has a high specific strength, is excellent in workability, and in addition, has high heat insulation and a humidity control effect. Also, it has an aesthetic design property created by natural materials, and furthermore, due to being a natural material, it has a small carbon dioxide emission amount and a high effect of reducing the environmental impact load.

[0004] Here, Patent Document 1 proposes a joint structure for a column and beam composed of a wooden column and a steel beam. Specifically, in the column, a beam load bearing portion is provided on the central side from the joint end portion in contact with the beam, and a part of the load of the beam is transmitted to the beam load bearing portion by a joining metal for joining the column and the beam, and the load of the beam is supported by the joint end portion of the column and the beam load bearing portion, which is a column-beam joint structure.

[0005] In this column-beam joint structure, a column reinforcing material made of carbon fiber is attached to the outer periphery of the joint end portion side of the column in contact with the beam. Further, at least one or more L-shaped joining metals for joining the beam and the column are attached, and a step is provided in this L-shaped joining metal so that a part of the contact surface in contact with the column does not interfere with the reinforcing material.

Prior Art Documents

Patent Document

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] As described above, compared with a wooden structure formed by existing wooden columns and wooden beams, according to the column-beam joint structure (hybrid structure) composed of wooden columns and steel beams described in Patent Document 1, the plastic deformation capacity of the building structure during an earthquake is increased. By the way, in the column-beam joint structure composed of wooden columns and steel beams described in Patent Document 1, the joint between the column and the beam is achieved by bolt-joining an L-shaped joint metal to both the wooden column and the steel beam. Since the strength of the joint between the column and the beam can also greatly depend on the strength of the L-shaped joint metal, there is room for improvement regarding the strength of the joint between the column and the beam.

[0008] In addition, since it is a structure for joining a wooden column and a steel beam, it is necessary to improve the rigidity of the wooden column to match the rigidity of the steel beam, but Patent Document 1 does not describe this.

[0009] The present invention has been made in view of the above problems, and relates to a joint structure between a wooden column unit and a steel beam, and aims to provide a joint structure between a wooden column unit and a steel beam that has a highly rigid wooden column unit and has a high strength at the joint where the wooden column unit and the steel beam are joined.

Means for Solving the Problems

[0010] To achieve the above object, one aspect of the joint structure between a wooden column unit and a steel beam according to the present invention is A joint structure between a wooden column unit and a steel beam, The wooden column unit includes a first wooden column unit, a second wooden column unit, and a third wooden column unit, with the ends facing each other with respect to a pair of wide surfaces of the first wooden column unit. The steel frame beam includes a steel joint disposed above and / or below the first wooden column unit, a pair of first steel frame beams disposed above and / or below the first wooden column unit and joined to the steel joint, a second steel frame beam disposed above and / or below the second wooden column unit and joined to the steel joint, and a third steel frame beam disposed above and / or below the third wooden column unit and joined to the steel joint. The wooden column unit is a rectangular parallelepiped wooden column, and a steel box disposed in each notch at the four corner portions of the wooden column, and a tension member inserted through a through-opening connecting the two steel boxes above and below in the wooden column. The steel box includes a pair of upper and lower plates and a plurality of side plates connecting the pair of upper and lower plates. A first hole through which the tension member is inserted is formed in one of the pair of upper and lower plates, and a second hole through which a bolt is inserted when bolted to the steel frame beam is formed in the other of the pair of upper and lower plates. An access opening for accessing the inside of the steel box is provided in the middle of the plurality of side plates. The end portion of the tension member is inserted into the first hole of each of the upper and lower steel boxes and is fixed to a fixture inside each of the steel boxes in a state where the tension member is tensioned. A third hole through which a bolt is inserted when bolted to the steel box is formed in each steel frame beam. Bolts are inserted through the third holes of the steel frame beams corresponding to the second holes of each wooden column unit, and by being bolted, the plurality of wooden column units and the steel frame beams form a cross shape.

[0011] According to this aspect, in a joint structure where a plurality of wooden pillar units and a steel frame beam form a cross shape, steel boxes are arranged in respective notches at four corner portions of the wooden pillars constituting each wooden pillar unit, and the steel frame beam is bolted to the bolts inserted through the second holes of the steel boxes, so that the wooden pillar and the steel frame beam are joined via a steel box with higher rigidity compared to an L-shaped joint metal fitting, thereby enhancing the strength of the joint portions of both. Further, with the tension members inserted through the through openings inside the wooden pillars being in a tensioned state, their ends are fixed to the fixtures inside the upper and lower steel boxes, so that a compressive force is applied to the wooden pillars from the tensioned tension members, enhancing the rigidity of the wooden pillars.

[0012] Here, as an example, a form can be cited in which one tension member is arranged for each of one through opening between the upper and lower pairs of left and right steel boxes, providing a total of two tension members, or a form in which a plurality (for example, two) of tension members are arranged for each of a plurality (for example, two) of through openings, providing a total of four tension members. Also, the "through opening" includes both a through hole extending between the upper and lower pairs of notches and a through groove provided inside from the wide surface or side surface (narrow end) of the wooden pillar and extending between the upper and lower pairs of notches.

[0013] Also, one or more access openings are provided in the middle of the plurality of side plates of the steel box, so that the fixture can be transferred into the steel box through the access opening and attached to the end of the tension member. Further, the worker can manually tighten the fixture inside the steel box through the access opening.

[0014] Here, "arranged above and / or below the wooden pillar unit" includes a form in which the steel joint or the steel frame beam is arranged on either the upper or lower side of the wooden pillar unit, and a form in which it is arranged on both the upper and lower sides of the wooden pillar unit.

[0015] In addition, in this aspect, since the ends of both the second wooden pillar unit and the third wooden pillar unit face the pair of wide surfaces of the first wooden pillar unit, the first wooden pillar unit becomes a so-called winning-side wooden pillar unit, while the second wooden pillar unit and the third wooden pillar unit become so-called losing-side wooden pillar units.

[0016] The "wooden pillar" includes wooden wall pillars in addition to ordinary wooden columns. Also, for the "tension member", PC (Prestressed Concrete) steel bars, PC steel wires, etc. can be applied. Further, a sheath pipe may be provided inside the through-opening. Furthermore, as the tension member, a bonded PC pressure-bonding material by a bonded PC pressure-bonding method in which the tension member is pressure-bonded through grout filled inside the through-opening (or sheath pipe), or an unbonded PC pressure-bonding material by an unbonded PC pressure-bonding method that does not require grout filling can be applied.

[0017] Another aspect of the joint structure between the wooden pillar unit and the steel beam according to the present invention is a joint structure between a wooden pillar unit and a steel beam, wherein the wooden pillar unit includes a first wooden pillar unit and a second wooden pillar unit whose end faces the one wide surface of the first wooden pillar unit, the steel beam includes a steel joint disposed above and / or below the first wooden pillar unit, a pair of first steel beams disposed above and / or below the first wooden pillar unit and joined to the steel joint, and a second steel beam disposed above and / or below the second wooden pillar unit and joined to the steel joint, the wooden pillar unit has a rectangular parallelepiped-shaped wooden pillar, a steel box disposed in each notch at the four corner portions of the wooden pillar, and a tension member inserted through a through-opening connecting the two steel boxes above and below in the wooden pillar. The steel box includes a pair of upper and lower plates and a plurality of side plates connecting the pair of upper and lower plates. A first hole through which the tension member is inserted is formed in one of the pair of upper and lower plates, and a second hole through which a bolt is inserted when bolted to the steel frame beam is formed in the other of the pair of upper and lower plates. An access opening for accessing the inside of the steel box is provided in the middle of the plurality of side plates. The end portions of the tension members are inserted into the respective first holes of the upper and lower steel boxes, and are fixed to the fixtures inside the respective steel boxes in a state where the tension members are tensioned. Each steel frame beam is provided with a third hole through which a bolt is inserted when bolted to the steel box. Bolts are inserted into the third holes of the steel frame beams corresponding to the second holes of each wooden column unit and bolted, so that the plurality of wooden column units and the steel frame beams form a T shape.

[0018] According to this aspect, in the joining structure in which a plurality of wooden column units and a steel frame beam form a T shape, steel boxes are arranged in the respective notches at the four corners of the wooden columns constituting each wooden column unit, and are bolted to the steel frame beam by bolts inserted into the second holes of the steel boxes. Thus, the wooden columns and the steel frame beam are joined via a steel box with higher rigidity than an L-shaped joint metal, so that the strength of the joint portions of both can be increased. Further, in a state where the tension member inserted into the through opening inside the wooden column is tensioned, the end portion thereof is fixed to the fixture inside the upper and lower steel boxes, so that a compressive force is applied to the wooden column from the tensioned tension member, and the rigidity of the wooden column can be increased.

[0019] In this aspect, since the narrow ends of the second wooden column unit face the pair of wide surfaces of the first wooden column unit, the first wooden column unit becomes a so-called winning-side wooden column unit, while the second wooden column unit becomes a so-called losing-side wooden column unit.

[0020] Another aspect of the joining structure of the wooden column unit and the steel frame beam according to the present invention is A gap is provided between the wide surface of the first wooden column unit and the narrow end of the second wooden column unit or the third wooden column unit.

[0021] According to this aspect, since a gap is provided between the wide surface of the first wooden column unit and the narrow end of the second wooden column unit or the third wooden column unit, when the structure undergoes inter-story deformation during an earthquake, it is possible to prevent the narrow ends of the losing-side second wooden column unit and third wooden column unit from being recessed into the wide surface of the first wooden column unit.

[0022] Another aspect of the joint structure between the wooden column unit and the steel beam according to the present invention is The steel joint is disposed at the central position in the longitudinal direction above and / or below the first wooden column unit.

[0023] According to this aspect, since the steel joint is disposed at the central position in the longitudinal direction above and / or below the first wooden column unit, the joint portion of the steel beam also becomes the central position in the longitudinal direction above or below the first wooden column unit. For example, it is possible to prevent the joint portion between the steel beams from being located at a position deviated from the wooden column unit. For example, in the case where there is a steel joint at the central position in the longitudinal direction above the first wooden column unit, the joint portion of a plurality of steel beams is at this one location. On the other hand, if the joint portion between the steel beams is at a position deviated from the wooden column unit, simply the number of joint locations becomes two on the left and right of the wooden column unit, resulting in an increase in the number of joint locations and a decrease in workability. Furthermore, it may lead to an unbalanced arrangement of steel beams such that a short beam needs to be installed between other wooden column units.

[0024] Another aspect of the joint structure between the wooden column unit and the steel beam according to the present invention is The steel joint has a rectangular parallelepiped box shape, and the upper or lower part is an access opening.

[0025] According to this aspect, since the steel joint has a rectangular parallelepiped box shape with an access opening above or below, the workability when a plurality of steel frames are joined to the steel joint from two to four directions is improved. For example, the steel joint arranged above the wooden column unit has an access opening above it, and the steel joint arranged below the wooden column unit has an access opening below it.

[0026] Further, another aspect of the joining structure of the wooden column unit and the steel frame beam according to the present invention is above and / or below the wooden column unit, the beam configurations of both steel frame beams connected via the steel joint are different, and among above and / or below the wooden column unit, the region corresponding to the steel frame beam with a relatively higher beam configuration is recessed by the difference in beam configurations between the two, which is characterized.

[0027] According to this aspect, in a form having stepped beams with different beam configurations of both steel frame beams connected via a steel joint, among above and / or below the wooden column unit, the region corresponding to the steel frame beam with a relatively higher beam configuration is recessed by the difference in beam configurations between the two, so that when two stepped beams are arranged above or below the wooden column unit, the top ends of both stepped beams can be aligned flush.

[0028] Further, another aspect of the joining structure of the wooden column unit and the steel frame beam according to the present invention is the tension member is an unbonded PC crimping member, which is characterized.

[0029] According to this aspect, since the tension member is an unbonded PC crimping member, the arrangement of the sheath pipe and the filling of grout for the through opening are made unnecessary, and the wooden column unit can be manufactured by a crimping method excellent in manufacturability.

[0030] Also, in another aspect of the joining structure of the wooden column unit and the steel frame beam according to the present invention, the first hole is provided at the central position of the thickness of the wooden column and at the central position of the width of the steel box, which is characterized.

[0031] According to this aspect, since the first hole through which the end portion of the tension member is inserted is provided at the center position of the thickness of the wooden column and at the center position of the width of the steel box, a plurality of tension members in a tensioned state can be arranged at the center position of the thickness of the wooden column, and a compressive force can be effectively applied to the entire area of the wooden column.

[0032] Also, in another aspect of the joining structure between the wooden column unit and the steel beam according to the present invention, the wooden column is characterized in that it is a wall column formed of any one of a plurality of square timber units, glued laminated timber, solid wood, structural plywood, laminated veneer lumber (LVL), and cross-laminated timber (CLT).

[0033] According to this aspect, since the wooden column is a wall column formed of any one of a plurality of square timber units, glued laminated timber, solid wood, structural plywood, laminated veneer lumber (LVL), and cross-laminated timber (CLT), the wall column functions as a shear wall while applying the wooden column. For example, by adjusting the number of square timbers or the width of laminated veneer lumber (LVL) or cross-laminated timber (CLT), a wall column with desired rigidity (seismic resistance) can be formed.

Effect of the Invention

[0034] As can be understood from the above description, according to the joining structure between the wooden column unit and the steel beam of the present invention, it is possible to provide a joining structure between the wooden column unit and the steel beam that has a highly rigid wooden column unit and has a high strength at the joint where the wooden column unit and the steel beam are joined.

Brief Description of the Drawings

[0035]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8A

Figure 8B

Mode for Carrying Out the Invention

[0036] Hereinafter, an example of a joining structure between a wooden column unit and a steel beam according to an embodiment will be described with reference to the accompanying drawings together with an example of a wooden column unit forming the joining structure. In the present specification and drawings, substantially the same components may be denoted by the same reference numerals to omit redundant descriptions.

[0037] [Joining Structure between Wooden Column Unit and Steel Beam According to Embodiment] Referring to FIGS. 1 to 8, an example of the joint structure between a wooden column unit and a steel beam according to an embodiment will be described. Here, FIG. 1 is a front view of an example of a wooden column unit forming the joint structure between the wooden column unit and the steel beam according to the embodiment, FIG. 2 is a cross-sectional view taken along the arrow II-II of FIG. 1, looking downward after cutting the wooden column unit at an intermediate position of the steel box, and FIG. 3 is a perspective view of an example of the steel box. Further, FIG. 4 is a longitudinal sectional view showing an example of the joint structure between the wooden column unit and the steel beam according to the embodiment, cut at an intermediate position of the second wooden column unit. Furthermore, FIG. 5 is a cross-sectional view taken along the arrow V-V of FIG. 4, showing an example of the joint structure between the wooden column unit and the steel beam according to the embodiment, cut at an intermediate position of the wooden column, and FIG. 6 is a longitudinal sectional view taken along the arrow VI-VI of FIG. 5, showing an example of the joint structure between the wooden column unit and the steel beam according to the embodiment, cut at an intermediate position of the first wooden column unit, and FIG. 7 is a perspective view of an example of the steel joint.

[0038] As shown in FIG. 1, the first wooden column unit 50 (an example of the wooden column unit) has a rectangular parallelepiped-shaped wooden column 10. Rectangular parallelepiped-shaped notches 15 are provided at the four corner portions of the wooden column 10, and steel boxes 20 are disposed in the respective notches 15.

[0039] The wooden column 10 is a wall column. Regarding the cross-sectional dimensions shown in FIG. 2 that are orthogonal to the axial direction of the column, the width t2 in the wall thickness direction (width direction) has a width that is, for example, substantially the same as the wall thickness or larger than the wall thickness (when the thicknesses of the heat insulating material and the exterior material are added, the width in the wall thickness direction can generally be larger than the wall thickness), and the width t1 in the direction orthogonal to the wall thickness (see FIG. 1) is a rectangular cross-section with a width that is about two to several times the width t2 in the wall thickness direction, and it is a column with a wide wide surface 14.

[0040] The above-mentioned rectangular parallelepiped-shaped notches 15 are respectively provided at the four corner portions formed by the upper end surface 11, the lower end surface 12, and the left and right side surfaces 13.

[0041] The wall column wooden column 10 is formed of any one of a plurality of corner members (log materials) units, glued laminated timber, solid wood, structural plywood, laminated veneer lumber (LVL), and cross-laminated timber (CLT).

[0042] So as to straddle the pair of upper and lower notches 15 on the left and right, two through openings 17 (a total of four through openings 17) are respectively provided at the central position in the wall thickness direction. Here, the through opening 17 shown in FIG. 1 is a through hole.

[0043] As shown in FIG. 3, the steel box 20 has an outer shape complementary to the notch 15 provided in the wooden column 10, has a rectangular shape in plan view, and includes a pair of upper and lower plates 21 and 22 and three side plates 23. An access opening 25 that allows access to the inside of the steel box 20 is provided at an intermediate position of the side plate 23.

[0044] Unlike the sheet-like connecting hardware such as the L-shaped connecting hardware described in Patent Document 1 above, the steel box 20 has a box shape, and thus becomes a highly rigid joining member. Here, the steel box 20 may be integrally manufactured by casting or the like, or may be manufactured by welding each plate made of flat steel to each other.

[0045] In a state where the steel box 20 is disposed in the notch 15, a first hole 26 is opened at a position corresponding to the two through holes 17 in the lower upper plate 22 of the steel box 20.

[0046] In the upper notch 15, the steel box 20 is disposed in the posture shown in FIG. 3, and in the lower notch 15, the steel box 20 shown in FIG. 3 is disposed in a posture where it is turned upside down.

[0047] As shown in FIG. 3, the first hole 26 is opened at the central position (t2 / 2) of the width t2 of the steel box 20. Therefore, as shown in FIG. 2, in a state where the steel box 20 is disposed in the notch 15, it is disposed at the central position of the thickness of the wooden column 10.

[0048] In the steel box 20 disposed in the upper notch 15, as shown in FIG. 3, a plurality (six in the illustrated example) of second holes 27 are formed in the upper upper and lower plates 21 so as to be respectively aligned with a plurality of third holes 84 formed in the lower flange 83 of the first steel frame beam 80A (an example of a steel frame beam, see FIG. 4), and bolts 88B are inserted therethrough. The first wooden pillar unit 50 and the first steel frame beam 80A are bolted together by the bolts 88B inserted through the corresponding second holes 27 and third holes 84.

[0049] As shown in FIGS. 1 and 2, the end portions 32 of the tension members 30 inserted through the through holes 17 are inserted into the first holes 26 of the upper and lower steel boxes 20 respectively, and are fixed to the steel boxes 20 by the fixtures 35 inside the steel boxes 20 in a state where the tension members 30 are tensioned, whereby the wooden pillar 10 and the first wooden pillar unit 50 in which the four steel boxes 20 at the corner portions are integrated are manufactured. Here, the manufacture of the first wooden pillar unit 50 is carried out in a factory, a production yard at the site, etc., the first wooden pillar unit 50 is erected on site, and the upper and lower first steel frame beams 80A (see FIG. 4) are joined to the first wooden pillar unit 50.

[0050] Here, as a method of introducing a tension force into the tension member 30, for example, a fixture 35 inside the lower steel box 20 is attached to the lower end portion 32 of the tension member 30, the end portion 32 of the tension member 30 inside the upper steel box 20 is tensioned, and a fixture 35 is attached to the end portion 32.

[0051] Specific methods of introducing a tension force into the tension member 30 include a method of tightening manually through the access opening 25, a method of setting the dimensions of the steel box 20 relatively large, installing a tension device (tension jack) (not shown) inside the steel box 20, and introducing a tension force with the tension device.

[0052] The tension member 30 in the illustrated example is an unbonded PC crimping member, and is installed by an unbonded PC crimping method that eliminates the need for the arrangement of the sheath pipe and the filling of grout with respect to the through-hole 17, and thus is crimped with excellent workability. Incidentally, a bonded PC crimping method in which the tension member is crimped through the grout filled inside the through-hole 17 may be applied.

[0053] The through-opening 17 provided in the wooden column 10 is a through-hole as in the illustrated example, but the through-opening may be a through-groove (not shown) instead. Specifically, there are forms such as a through-groove dug from one wide surface 14 of the wooden column 10 to the arrangement position of the corresponding tension member 30 extending across the upper and lower notches 15, a through-groove dug from two wide surfaces 14 of the wooden column 10 to the arrangement position of the corresponding tension member 30 extending across the upper and lower notches 15, and further, a through-groove 17B dug from the side surface 13 (narrow end) of the wooden column 10 to the arrangement positions of the two tension members 30 extending across the upper and lower notches 15.

[0054] In the joining structure 100 of the wooden column unit and the steel beam shown in FIGS. 4 to 7, with respect to the pair of wide surfaces 14 of the first wooden column unit 50 shown in FIG. 1, the narrow ends 13 of the second wooden column unit 60A (another example of the wooden column unit) and the third wooden column unit 60B (still another example of the wooden column unit) are arranged to face each other with a gap G therebetween, and the three wooden column units 50, 60A, 60B are arranged in a cross shape. That is, the first wooden column unit 50 becomes a so-called winning-side wooden column unit, while the second wooden column unit 60A and the third wooden column unit 60B become so-called losing-side wooden column units.

[0055] Here, in the illustrated example, the width t3 in the direction orthogonal to the wall thickness of the wooden pillar 10A forming the second wooden pillar unit 60A and the third wooden pillar unit 60B is set shorter than that of the first wooden pillar unit 50. There is one through opening 17 (two in total on the left and right) spanning the upper and lower steel boxes 20A in the second wooden pillar unit 60A and the third wooden pillar unit 60B, and a total of four second holes 27 (two of which are illustrated in FIG. 6) are provided in the upper and lower plates 21 of the steel box 20A. Although there are differences in dimensions and the number of components between the first wooden pillar unit 50, the second wooden pillar unit 60A, and the third wooden pillar unit 60B, the basic configurations of the three wooden pillar units 50, 60A, 60B are the same. Note that the second wooden pillar unit and the third wooden pillar unit may have the same configuration as the first wooden pillar unit (all three wooden pillar units are identical).

[0056] The joint structure 100 shown in FIGS. 4 to 7 is, for example, a joint structure between the wooden pillar units 50, 60A, 60B and the upper and lower steel beams 80 in the upper floor structure of a two - to three - story (multiple - story) building, condominium, nursing facility, etc.

[0057] The first steel beam 80A is made of an H - shaped steel having a web 81, an upper flange 82, and a lower flange 83. The lower flange 83 of the upper first steel beam 80A abuts on the upper surface of the upper and lower plates 21 of the upper steel box 20 of the first wooden pillar unit 50, and high - strength bolts 88B are inserted through the second holes 27 in the upper and lower plates 21 and the corresponding third holes 84 in the lower flange 83 for bolt connection. Here, the first steel beam 80A is provided with reinforcing ribs 65 at positions corresponding to the side plates 23 of the steel box 20.

[0058] Similarly, the upper flange 82 of the lower first steel beam 80A abuts on the lower surface of the lower and upper plates 21 of the lower steel box 20 of the first wooden pillar unit 50, and high - strength bolts 88B are inserted through the second holes 27 in the upper and lower plates 21 and the corresponding third holes 84 in the upper flange 82 for bolt connection.

[0059] Steel joints 70 shown in FIG. 7 are disposed at the central positions in the longitudinal direction (X direction in FIG. 4) above and below the first wooden pillar unit 50.

[0060] The steel joint 70 is made of steel and has a rectangular parallelepiped box shape, having four side walls 71 and one bottom plate 72 (or top plate 72), and is provided with an access opening 75 communicating with its interior above or below.

[0061] The state shown in FIG. 7 has the bottom plate 72 below and shows the posture of being arranged above the first wooden pillar unit 50. On the other hand, when it is arranged below the first wooden pillar unit 50, it is in a state where the up and down of FIG. 7 is reversed, and the top plate 72 is used with the posture facing the first wooden pillar unit 50 side.

[0062] A plurality (four in the illustrated example) of fourth holes 73 are opened in each side wall 71. As shown in FIG. 4, an end plate 85 is welded and joined to the end of the first steel beam 80A. A plurality of bolt holes (not shown) are opened in the end plate 85, and the fourth holes 73 corresponding to each bolt hole are aligned and bolted.

[0063] More specifically, the steel joints 70 are respectively arranged at the central positions in the longitudinal direction above and below the first wooden pillar unit 50, and the end plates 85 of the two left and right first steel beams 80A are bolted to a pair of opposite side walls 71 of each steel joint 70. During this bolt connection, the joining operation can be performed through the access opening 75 of the steel joint 70.

[0064] On the other hand, the end plates 86 at the ends of the second steel beam 80B and the third steel beam 80C arranged above and below the second wooden pillar unit 60A and the third wooden pillar unit 60B shown in FIG. 6 are abutted against the other pair of opposite side walls 71 of the steel joint 70, and bolts are inserted through the bolt holes (not shown) opened in each end plate 86 and the fourth holes 73 and bolted.

[0065] In this way, a pair of first steel beams 80A and second steel beams 80B, and a third steel beam 80C extending in four orthogonal directions are bolted to the steel joints 70 located at the central positions in the longitudinal directions above and below the first wooden pillar unit 50, respectively, and a joint structure 100 is formed in which three wooden pillar units 50, 60A, 60B and four steel beams 80A, 80A, 80B, 80C form a cross shape.

[0066] Here, an overview of the construction method of the joint structure 100 is as follows. First, as already described, the factory-produced first wooden pillar units 50A, second wooden pillar units 60A, and third wooden pillar units 60B with tension introduced by the tension members 30 are transported to the site.

[0067] At the site, the two lower first steel beams 80A are bolted to the steel joint 70 using the access opening 75 of the steel joint 70, the first wooden pillar unit 50 is arranged above them, and the pair of steel boxes 20 below the first wooden pillar unit 50 and the upper flanges 82 of the respective first steel beams 80A are bolted using the access opening 25 of the steel box 20.

[0068] Next, one of the first steel beams 80A is arranged above the first wooden pillar unit 50, the one steel box 20 above the first wooden pillar unit 50 and the lower flange 83 of the first steel beam 80A are bolted using the access opening 75, and the side wall 71 of the steel joint 70 is bolted to the end plate 85 of the first steel beam 80A using the access opening 25.

[0069] Next, the end plate 85 of another first steel beam 80A is bolted to the side wall 71 of the steel joint 70 and also bolted to the steel box 20, so that the upper and lower steel joints 70, the unit of the pair of first steel beams 80A, and the first wooden pillar unit 50 between them are bolted together.

[0070] Next, bolt the end plates 86 of the lower second steel girder 80B and the third steel girder 80C to the lower steel joint 70, and bolt the pair of lower steel boxes 20A of the second wooden column unit 60A and the third wooden column unit 60B to the upper flanges 82 of the second steel girder 80B and the third steel girder 80C.

[0071] Next, place the second steel girder 80B above the second wooden column unit 60A, bolt the pair of upper steel boxes 20A of the second wooden column unit 60A and the lower flange 83 of the second steel girder 80B, and bolt the side wall 71 of the steel joint 70 to the end plate 86 of this second steel girder 80B.

[0072] Next, bolt the end plate 86 of the third steel girder 80C to the side wall 71 of the steel joint 70 and bolt it to the steel box 20A, whereby a joint structure 100 is constructed in which the three wooden column units 50, 60A, 60B and the four steel girders 80A, 80A, 80B, 80C form a cross shape.

[0073] According to the joint structure 100 of the wooden column unit and the steel girder, in the joint structure 100 in which the plurality of wooden column units 50, 60A, 60B and the steel girders 80A, 80A, 80B, 80C form a cross shape, steel boxes 20, 20A are arranged at the respective notches 15 at the four corner portions of the wooden columns 10, 10A constituting each of the wooden column units 50, 60A, 60B, and are bolted to the steel girders 80A, 80B, 80C by bolts inserted through the second holes 27 of the steel boxes 20, 20A. Thus, the wooden columns 10, 10A and the steel girders 80A, 80B, 80C are joined via the steel boxes 20, 20A having higher rigidity than the L-shaped joint metal fittings, so that the strength of both joints can be increased. Further, with the tension member 30 inserted through the through-opening 17 inside the wooden columns 10, 10A being in a tensioned state, the ends thereof are fixed to the fixtures 35 inside the upper and lower steel boxes 20, 20A, so that a compressive force is applied to the wooden columns 10, 10A from the tensioned tension member 30, and the rigidity of the wooden columns 10, 10A can be increased.

[0074] In addition, since the steel joint 70 is disposed at the longitudinal center positions above and below the first wooden pillar unit 50, the joint portion of the first steel beam 80A also becomes the longitudinal center positions above and below the first wooden pillar unit 50, and for example, it is possible to prevent the joint portion between the first steel beams 80A from being located at a position deviated from the first wooden pillar unit 50.

[0075] Moreover, since a gap G is provided between the wide surface 14 of the so-called winning-side first wooden pillar unit 50 and the edges 13 of the so-called losing-side second wooden pillar unit 60A and third wooden pillar unit 60B, when the structure undergoes inter-story deformation during an earthquake, it is possible to suppress the edges 13 of the losing-side second wooden pillar unit 60A and third wooden pillar unit 60B from intruding into the wide surface 14 of the first wooden pillar unit 50. Here, the size of the gap can be set to, for example, a size capable of absorbing the horizontal displacement amount of the structure during the inter-story deformation required by the design.

[0076] In a relatively large multi-story building, there may be cases where the outer peripheral columns alone cannot sufficiently bear the horizontal force during an earthquake. However, by applying the illustrated joint structure 100 to the structure of each floor, it becomes possible to sufficiently bear the horizontal force during an earthquake while applying the generally applied cross-shaped wall arrangement.

[0077] Here, although not shown in the drawings, as the joint structure between the wooden pillar unit and the steel beam, in addition to the cross-shaped structure in the illustrated example, for example, a T-shaped joint structure in which the third wooden pillar unit 60B and the third steel beams 80C above and below it do not exist in FIG. 5 may also be used.

[0078] FIGS. 8A and 8B show the wooden pillar corresponding to the stepped beam and the accommodation of the steel beam with respect to the wooden pillar. Here, FIG. 8A is a diagram for explaining a modified example of the wooden pillar unit and the accommodation of the stepped beam, and FIG. 8B is a front view from above of the wooden pillar constituting the modified example of the wooden pillar unit shown in FIG. 8A.

[0079] As shown in FIG. 8A, the left and right steel beams 80A, 80A' above the wooden pillar unit 50A have different beam depths t5, t6 (t5 > t6).

[0080] When such a stepped beam is arranged, as shown in FIG. 8B, in a region of the upper end surface 11A of the wooden column 10A constituting the wooden column unit 50A that corresponds to the steel beam 80A with a relatively higher beam formation, a depression 10a corresponding to the difference value of the beam formations t5 and t6 is provided.

[0081] As a result, as shown in FIG. 8A, when a pair of steel beams 80A, 80A' bolted to each other via the steel joint 70 on the upper end surface 11A of the wooden column unit 50A are each bolted to a pair of steel boxes 20 of the wooden column unit 50A, the upper surfaces of the pair of steel beams 80A, 80A' can be flush, and it becomes possible to install the floor material of the upper floor etc. without a step on these upper surfaces.

[0082] In addition, other embodiments in which other components are combined etc. may be used for the configurations etc. described in the above embodiments, and the present invention is not limited to the configurations shown here at all. Regarding this point, it is possible to make changes without departing from the spirit of the present invention, and it can be appropriately determined according to the application form.

Explanation of Signs

[0083] 10, 10A, 10B: Wooden column 10a: Depression 11, 11A: Upper end surface 12: Lower end surface 13: Side surface (narrow side) 14: Wide surface 15: Notch 17: Through opening (through hole) 20, 20A: Steel box 21: Upper and lower plates (upper upper and lower plates) 22: Upper and lower plates (lower upper and lower plates) 23: Side plate 25: Access opening 26: First hole 27: Second hole 30: Tension member 32: End 35: Fastener 50: First wooden column unit (wooden column unit) 60A: Second wooden column unit (wooden column unit) 60B: Third wooden column unit (wooden column unit) 70: Steel joint 71: Side wall 72: Bottom plate (ceiling plate) 73: Fourth hole 75: Access opening 80A, 80A': First steel beam (steel beam) 80B: Second steel beam (steel beam) 80C: Third steel beam (steel beam) 81: Web 82: Upper flange 83: Lower flange 84: Third hole 85, 86: End plate 87: Reinforcing rib 88A, 88B: Bolt (high-strength bolt) 100: Joint structure (joint structure between wooden column unit and steel beam) G: Gap

Claims

1. A joining structure between a wooden column unit and a steel frame beam, wherein the wooden column unit includes a first wooden column unit, a second wooden column unit, and a third wooden column unit, with the ends of the second and third wooden column units facing each other with their narrow sides opposite to a pair of wide sides of the first wooden column unit, the steel frame beam includes a steel joint disposed above and / or below the first wooden column unit, a pair of first steel frame beams disposed above and / or below the first wooden column unit and joined to the steel joint, a second steel frame beam disposed above and / or below the second wooden column unit and joined to the steel joint, and a third steel frame beam disposed above and / or below the third wooden column unit and joined to the steel joint, the wooden column unit comprises a rectangular parallelepiped wooden column, steel boxes disposed in respective notches at four corner portions of the wooden column, and tension members inserted through through-holes connecting the two steel boxes above and below in the wooden column, each steel box comprises a pair of upper and lower plates and a plurality of side plates connecting the pair of upper and lower plates, a first hole through which the tension member is inserted is opened in one of the pair of upper and lower plates, a second hole through which a bolt is inserted when bolt-joined to the steel frame beam is opened in the other of the pair of upper and lower plates, and an access opening allowing access to the inside of the steel box is provided in the middle of the plurality of side plates, the ends of the tension members are inserted through the respective first holes of the upper and lower steel boxes and are fixed to fixtures inside the respective steel boxes in a state where the tension members are tensioned, a third hole through which a bolt is inserted when bolt-joined to the steel box is opened in each steel frame beam, bolts are inserted through the third holes of the steel frame beams corresponding to the second holes of each wooden column unit and bolt-joined, whereby the plurality of wooden column units and the steel frame beams form a cross shape. A joining structure between a wooden column unit and a steel frame beam, characterized in that.

2. A joining structure between a wooden column unit and a steel frame beam, wherein the wooden column unit includes a first wooden column unit and a second wooden column unit with the end of the second wooden column unit facing the narrow side of the first wooden column unit, The steel frame beam includes a steel joint disposed above and / or below the first wooden column unit, a pair of first steel frame beams disposed above and / or below the first wooden column unit and joined to the steel joint, and a second steel frame beam disposed above and / or below the second wooden column unit and joined to the steel joint. The wooden column unit is a rectangular parallelepiped wooden column, a steel box disposed in each notch at the four corner portions of the wooden column, and a tension member inserted through a through-opening connecting the two steel boxes above and below in the wooden column. The steel box includes a pair of upper and lower plates and a plurality of side plates connecting the pair of upper and lower plates. A first hole through which the tension member is inserted is formed in one of the pair of upper and lower plates, and a second hole through which a bolt is inserted when bolted to the steel frame beam is formed in the other of the pair of upper and lower plates. An access opening for accessing the inside of the steel box is provided in the middle of the plurality of side plates. The end portion of the tension member is inserted into each of the first holes of the upper and lower steel boxes and is fixed to a fixture inside each of the steel boxes in a state where the tension member is tensioned. A third hole through which a bolt is inserted when bolted to the steel box is formed in each steel frame beam. A bolt is inserted through the third hole of the steel frame beam corresponding to the second hole of each wooden column unit, and by bolt connection, a plurality of wooden column units and the steel frame beam form a T shape. A joining structure of a wooden column unit and a steel frame beam, characterized in that.

3. The joining structure of a wooden column unit and a steel frame beam according to claim 1 or 2, characterized in that a gap is provided between the wide surface of the first wooden column unit and the end of the second wooden column unit or the third wooden column unit.

4. The joining structure of a wooden column unit and a steel frame beam according to claim 1 or 2, characterized in that the steel joint is disposed at a central position in the longitudinal direction above and / or below the first wooden column unit.

5. The joining structure of a wooden column unit and a steel frame beam according to claim 1 or 2, characterized in that the steel joint has a rectangular parallelepiped box shape and an access opening is formed above or below.

6. Above and / or below the wooden column unit, the beam formations of the two steel frame beams connected via the steel joint are different. The joining structure of the wooden column unit and the steel frame beam according to claim 1 or 2, characterized in that a region corresponding to the steel frame beam having a relatively high beam formation is recessed due to the difference in beam formation between the upper and / or lower sides of the wooden column unit.

7. The joining structure of the wooden column unit and the steel frame beam according to claim 1 or 2, characterized in that the tension member is an unbonded PC crimping material.

8. The joining structure of the wooden column unit and the steel frame beam according to claim 1 or 2, characterized in that the first hole is opened at the center position of the thickness of the wooden column and at the center position of the width of the steel box.

9. The joining structure of the wooden column unit and the steel frame beam according to claim 1 or 2, characterized in that the wooden column is a wall column formed of any one of a unit of a plurality of square timbers, glued laminated timber, solid wood, structural plywood, laminated veneer lumber, and cross-laminated timber.

Images