Wooden column joint structure

Abstract

The purpose of this invention is to ensure the fire resistance of the joints between the lower wooden pillars and the upper wooden pillars while improving workability. [Solution] The wooden column joint structure comprises a lower wooden column (10), a lower precast joint member (40) having a connecting bar (42C) attached to the upper surface (10U) of the lower wooden column (10) and a first concrete portion (44) covering the connecting bar (42C), an upper wooden column (20) arranged above the lower wooden column (10), an upper precast joint member (50) attached to the lower surface (20L) of the upper wooden column (20) and having a mechanical joint (52C) ​​connected to the connecting bar (42C) and a second concrete portion (54) covering the mechanical joint (52C), and a cement-based filler (60) filled between the first concrete portion (44) and the second concrete portion (54).

Description

[Technical Field]

[0001] The present invention relates to a wooden column joint structure. [Background technology]

[0002] A joint structure in which a wooden column and a steel connection member are joined with lag screw bolts and bolts is known (see, for example, Patent Document 1). In the technology disclosed in Patent Document 1, the fire resistance of the steel connection member is ensured by filling the steel connection member with concrete. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-018461 Summary of the Invention [Problem to be solved by the invention]

[0004] When joining a wooden column and a steel connection member with a lag screw bolt and bolts, the bolts are tightened to the lag screw bolts at the construction site, and the steel connection member is joined to the wooden column, after which concrete is poured around the steel connection member. Therefore, concrete must be poured at the construction site, which is time-consuming.

[0005] In consideration of the above, the present invention aims to improve workability while ensuring the fire resistance of the joint between the lower wooden column and the upper wooden column. [Means for solving the problem]

[0006] The wooden column joint structure described in claim 1 comprises a lower wooden column, a lower precast joint member having a first steel connecting member attached to the upper surface of the lower wooden column and a first concrete section covering the first steel connecting member, an upper wooden column arranged above the lower wooden column, an upper precast joint member having a second steel connecting member attached to the lower surface of the upper wooden column and connected to the first steel connecting member and a second concrete section covering the second steel connecting member, and a cement-based filler filled between the first concrete section and the second concrete section.

[0007] According to the wooden column joint structure of claim 1, the lower precast connection member has a first steel connection member and a first concrete portion. The first steel connection member is attached to the upper surface of the lower wooden column. This first steel connection member is covered with the first concrete portion.

[0008] The upper precast connection member has a second steel connecting member and a second concrete section. The second steel connecting member is attached to the underside of the upper wooden column located above the lower wooden column and connected to the first steel connecting member. The second steel connecting member is covered with a second concrete section.

[0009] Furthermore, a cement-based filler is filled between the first concrete portion of the lower precast connection element and the second concrete portion of the upper precast connection element, thereby joining the lower wooden column and the upper wooden column via the lower precast connection element, the upper precast connection element, and the cement-based filler.

[0010] Here, the first steel connection member is covered by the first concrete portion, and the second steel connection member is covered by the second concrete portion, thereby ensuring the fire resistance of the first steel connection member and the second steel connection member.

[0011] Furthermore, since the lower precast joint members are manufactured in a factory or the like and attached to the lower wooden pillars, there is no need to pour concrete on-site. Similarly, since the upper precast joint members are manufactured in a factory or the like and attached to the lower wooden pillars, there is no need to pour concrete on-site. This reduces the labor required to join the lower wooden pillars and the upper wooden pillars.

[0012] In this way, the present invention can improve workability while ensuring fire resistance at the joint between the lower wooden column and the upper wooden column.

[0013] The wooden column joint structure described in claim 2 is the wooden column joint structure described in claim 1, wherein one of the first steel connecting member and the second steel connecting member is a connecting bar, and the other of the first steel connecting member and the second steel connecting member is a mechanical joint into which the connecting bar is inserted.

[0014] According to the wooden column joint structure of claim 2, either the first steel connecting member or the second steel connecting member is a connecting bar, and the other of the first steel connecting member or the second steel connecting member is a mechanical joint into which the connecting bar is inserted.

[0015] In this way, the present invention makes it possible to easily connect the connector bars to the mechanical joint by inserting the connector bars into the mechanical joint, thereby improving workability.

[0016] The wooden column joint structure described in claim 3 is the wooden column joint structure described in claim 2, in which the first steel connecting member and the second steel connecting member are bolted between the first concrete portion and the second concrete portion.

[0017] According to the wooden column joint structure of claim 3, the first steel connection member and the second steel connection member are bolted between the first concrete portion and the second concrete portion. This makes it possible to easily join the first steel connection member and the second steel connection member, thereby improving workability.

[0018] The wooden column joint structure described in claim 4 is a wooden column joint structure described in any one of claims 1 to 3, wherein the first steel connecting member is attached to the upper surface of the lower wooden column by a first screw member, and the second steel connecting member is attached to the lower surface of the upper wooden column by a second screw member.

[0019] According to the wooden column joint structure of claim 4, the first steel connecting member is attached to the upper surface of the lower wooden column by the first screw member, which makes it easy to attach the first steel connecting member to the lower wooden column.

[0020] Similarly, the second steel connecting member is attached to the underside of the upper wooden column by the second screw member, which makes it easy to attach the second steel connecting member to the upper wooden column. [Effects of the Invention]

[0021] As described above, according to the present invention, it is possible to improve workability while ensuring the fire resistance of the joint between the lower wooden column and the upper wooden column. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a vertical cross-sectional view showing a lower wooden column and an upper wooden column to which the wooden column joint structure according to the first embodiment is applied. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. [Figure 5] FIG. 2 is a vertical cross-sectional view corresponding to FIG. 1 showing the construction process of the lower wooden pillar and the upper wooden pillar. [Figure 6] FIG. 2 is a vertical cross-sectional view corresponding to FIG. 1 showing the construction process of the lower wooden pillar and the upper wooden pillar. [Figure 7] A vertical cross-sectional view showing a lower wooden column and an upper wooden column to which a wooden column joint structure related to the second embodiment is applied. [Figure 8] FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. [Figure 9] FIG. 2 is a vertical cross-sectional view corresponding to FIG. 1 showing the construction process of the lower wooden pillar and the upper wooden pillar. [Figure 10] FIG. 2 is a vertical cross-sectional view corresponding to FIG. 1 showing the construction process of the lower wooden pillar and the upper wooden pillar. DETAILED DESCRIPTION OF THE INVENTION

[0023] (First embodiment) First, the first embodiment will be described.

[0024] (Wooden column joint structure) 1 shows a lower wooden column 10 and an upper wooden column 20 to which the wooden column joint structure according to this embodiment is applied. The lower wooden column 10 and the upper wooden column 20 are joined via a joint J.

[0025] (Lower wooden pillar, upper wooden pillar) The lower end of the upper wooden pillar 20 is joined to the upper end of the lower wooden pillar 10 via an upper precast joint member 50. The basic structures of the lower wooden pillar 10 and the upper wooden pillar 20 are the same. Therefore, the following will explain the structure of the lower wooden pillar 10, and will omit explanation of the structure of the upper wooden pillar 20.

[0026] As shown in Figure 2, the lower wooden column 10 is formed in a square pillar shape. In addition, a fire-resistant structure is applied to the lower wooden column 10. This lower wooden column 10 has a wood core 30 that supports the load and a fire-resistant coating layer 32 that provides fire-resistant coating to the wood core 30.

[0027] (woody heart) The wood core 30 is made of wood material such as laminated lumber. The wood core 30 extends in the axial direction of the lower wooden column 10 and has a rectangular cross section. The wood core 30 is formed to be able to support the load (long-term load and short-term load) borne by the lower wooden column 10.

[0028] (Fire-resistant coating) The fire-resistant coating layer 32 has a fire-retardant layer 34 that covers the woody core 30 and a substitute fire layer 36 that covers the fire-retardant layer 34.

[0029] (Burning-stop layer) A fire-retardant layer 34 is provided on the outside of the woody core 30. The fire-retardant layer 34 stops the combustion of the substitute fire layer 36 in the event of a fire (spontaneous extinguishing), and suppresses the combustion of the woody core 30. The fire-retardant layer 34 is arranged along the outer periphery of the woody core 30, covering the entire side surface of the woody core 30.

[0030] The fire-retardant layer 34 is a high-heat-capacity layer (heat-capacity type) with a larger heat capacity than the wood core 30. This fire-retardant layer 34 has multiple wooden pieces 34A and hardened bodies 34B arranged alternately on the outer surface of the wood core 30. Each wooden piece 34A and hardened body 34B is arranged along the material axis direction of the lower wooden column 10.

[0031] The wooden pieces 34A are made of laminated wood or the like and are bonded to the outer surface of the wooden core 30 with adhesive or the like. On the other hand, the hardened pieces 34B are formed by hardening mortar, grout, or concrete, for example, and have a greater heat capacity than the wooden pieces 34A. By arranging the wooden pieces 34A and hardened pieces 34B alternately, the heat capacity of the entire fire-retardant layer 34 is greater than the heat capacity of the wooden core 30 and the substitute fire layer 36.

[0032] (Stolen layer) A wooden sub-combustible layer 36 is provided on the outside of the fire-stopping layer 34. The sub-combustible layer 36 burns in the event of a fire to form a carbonized layer (thermal insulating layer), thereby preventing the penetration of fire heat into the woody core 30.

[0033] The sub-combustible layer 36 is formed of a wooden material such as laminated wood. The sub-combustible layer 36 is disposed along the outer periphery of the fire-retardant layer 34, covering the entire outer surface of the fire-retardant layer 34. The sub-combustible layer 36 is bonded to the outer surface of the wooden material 34A of the fire-retardant layer 34 with an adhesive or the like.

[0034] The thickness (layer thickness) of the fuel layer 36 is appropriately set depending on the required fire resistance performance (fire resistance time) of the lower wooden column 10, the burning speed of the fuel layer 36, and the heat insulation performance.

[0035] In this embodiment, the fire-resistant coating layer 32 is composed of the fire-stopping layer 34 and the sub-burning layer 36, but one of the fire-stopping layer 34 and the sub-burning layer 36 may be omitted. The fire-resistant structure applied to the lower wooden column 10 is not limited to the one described above and can be changed as appropriate.

[0036] (joint) As shown in Figure 1, the lower wooden column 10 and the upper wooden column 20 are joined via a joint J. The joint J is interposed between the upper surface 10U of the lower wooden column 10 and the lower surface 20L of the upper wooden column 20. The joint J has a lower precast joint member 40, an upper precast joint member 50, and a cement-based filler 60.

[0037] (Lower precast joint member) A lower precast connection member 40 is provided on the upper surface 10U of the lower wooden column 10. The lower precast connection member 40 is a precast member that is manufactured in a factory, a construction site, or the like, and is attached to the upper surface 10U of the lower wooden column 10. The lower precast connection member 40 has a first steel connection member 42 and a first concrete portion 44.

[0038] The first steel connection member 42 is attached to the upper surface 10U of the lower wooden pillar 10. The first steel connection member 42 has a connection body 42A, a base plate 42B, and a plurality of connecting bars 42C. The connecting bars 42C are an example of the first steel connection member.

[0039] As shown in Fig. 3, the joint body 42A is formed, for example, from steel plates joined in a cross shape in a plan view. As shown in Fig. 1, a base plate 42B is provided at the lower end of the joint body 42A. The base plate 42B is formed from a rectangular steel plate or the like. This base plate 42B is placed on the upper surface of the wood core 30 of the lower wooden pillar 10.

[0040] The base plate 42B has a plurality of bolt holes (not shown) formed therein, and is fixed to a plurality of first lag screw bolts 12 by bolts 14, which are screwed into the wood core 30 of the lower wooden column 10.

[0041] The first lag screw bolt 12 is an example of a first screw member, and the bolt 14 is an example of a fastener fixed to the first screw member.

[0042] The base plate 42B is provided with a plurality of connecting bars 42C. The connecting bars 42C are, for example, made of reinforcing steel and are arranged in the vertical direction. The connecting bars 42C are also arranged at predetermined intervals.

[0043] The lower end (one end) of each connecting bar 42C is joined by welding or the like while abutting against the upper surface of base plate 42B. The upper end (the other end) of each connecting bar 42C protrudes upward from an upper surface 44U of a first concrete portion 44, which will be described later.

[0044] The shape and structure of the first steel connection member 42 can be changed as appropriate.

[0045] The first concrete portion 44 is made of covering concrete that covers the first steel connection member 42. The planar shape and size of this first concrete portion 44 are the same as the outer shapes of the lower wooden column 10 and the upper wooden column 20.

[0046] The first concrete portion 44 is formed, for example, by pouring concrete into a formwork that is temporarily set up around the first steel connection member 42 that is attached to the upper surface 10U of the lower wooden column 10. The upper surface 44U of the first concrete portion 44 is located at approximately the same position as the upper end of the first steel connection member 42.

[0047] Note that reinforcing bars or the like may be embedded in the first concrete portion 44. Furthermore, the shape of the first concrete portion 44 can be changed as appropriate depending on the shapes of the lower wooden pillar 10 and the upper wooden pillar 20.

[0048] (Upper precast joint member) An upper precast connection member 50 is provided on the underside 20L of the upper wooden column 20. The upper precast connection member 50 is a precast member that is manufactured in a factory, a construction site, or the like, and is attached to the underside 20L of the upper wooden column 20. The upper precast connection member 50 has a second steel connection member 52 and a second concrete section 54.

[0049] The second steel connection member 52 is attached to the underside 20L of the upper wooden pillar 20. The second steel connection member 52 has a connection body 52A, a base plate 52B, and a plurality of mechanical joints 52C. The mechanical joints 52C are an example of a second steel connecting member.

[0050] As shown in Fig. 4, the joint body 52A is formed, for example, from steel plates joined in a cross shape in a plan view. As shown in Fig. 1, a base plate 52B is provided at the upper end of the joint body 52A. The base plate 52B is formed from a rectangular steel plate or the like. This base plate 52B is placed on the underside of the wood core 30 of the upper wooden pillar 20.

[0051] The base plate 52B has a plurality of bolt holes (not shown) formed therein, and is fixed to a plurality of second lag screw bolts 22 by bolts 24, which are screwed into the wood core 30 of the upper wooden column 20.

[0052] The second lag screw bolt 22 is an example of a second screw member, and the bolt 24 is an example of a fastener fixed to the second screw member.

[0053] The base plate 52B is provided with a plurality of mechanical joints 52C. The plurality of mechanical joints 52C are formed, for example, in a cylindrical shape and are arranged in the up-down direction. The plurality of mechanical joints 52C are also arranged at predetermined intervals.

[0054] An upper end (one end) of each mechanical joint 52C is joined by welding or the like while being abutted against the lower surface of base plate 52B. In addition, a lower end (the other end) of each mechanical joint 52C is open to lower surface 54L of second concrete portion 54, which will be described later.

[0055] The upper portions of the multiple connecting bars 42C of the lower precast connection member 40 are inserted into the multiple mechanical joints 52C, respectively. Each mechanical joint 52C is filled with a cement-based filler 60 such as grout or mortar, thereby connecting the mechanical joints 52C and the connecting bars 42C.

[0056] The second concrete portion 54 is made of covering concrete that covers the second steel connection member 52. The planar shape and size of this second concrete portion 54 are the same as the outer shapes of the lower wooden column 10 and the upper wooden column 20.

[0057] The second concrete portion 54 is formed, for example, by pouring concrete into a formwork that is temporarily set up around the second steel connection member 52 that is attached to the underside 20L of the upper wooden column 20. The underside 54L of the second concrete portion 54 is located at approximately the same position as the lower end of the second steel connection member 52.

[0058] Note that reinforcing bars or the like may be embedded in the second concrete portion 54. Furthermore, the shape of the second concrete portion 54 can be changed as appropriate depending on the shapes of the lower wooden column 10 and the upper wooden column 20.

[0059] (cement-based filler) The lower surface of the upper precast connection member 50 is placed on the upper surface of the lower precast connection member 40 via a spacer 62. A cement-based filler 60 is filled in the joint (gap) between the upper surface 44U of the first concrete section 44 of the lower precast connection member 40 and the lower surface 54L of the second concrete section 54 of the upper precast connection member 50. In this way, the lower precast connection member 40 and the upper precast connection member 50 are integrated via the cement-based filler 60.

[0060] The spacers 62 are formed of, for example, steel plates or mortar, and are embedded in the cement-based filler 60.

[0061] (Construction method for wooden column joint structure) Next, an example of a construction method for a wooden column joint structure will be described.

[0062] 5 shows the erected lower wooden pillar 10. A lower precast joint member 40 is attached to the upper surface 10U of the lower wooden pillar 10. An upper precast joint member 50 is attached to the lower surface 20L of the upper wooden pillar 20.

[0063] From this state, first, the upper precast connection member 50 is lifted using a crane or the like (not shown), and as shown in Figure 6, the upper precast connection member 50 is placed on the upper surface 44U of the first concrete section 44 of the lower precast connection member 40 via spacers 62. At this time, the upper parts of the multiple connecting bars 42C protruding upward from the upper surface 44U of the first concrete section 44 are inserted into the lower ends of the multiple mechanical joints 52C embedded in the second concrete section 54 of the upper precast connection member 50.

[0064] Next, as shown in Fig. 1, cement-based filler 60 is filled into mechanical joint 52C through an injection hole (not shown) formed in upper precast connection member 50. This connects connecting bar 42C and mechanical joint 52C via mechanical joint 52C.

[0065] Next, cement-based filler 60 is filled into the joint between the first concrete portion 44 of the lower precast connection member 40 and the second concrete portion 54 of the upper precast connection member 50. This joins the lower precast connection member 40 and the upper precast connection member 50 via the cement-based filler 60.

[0066] The construction procedure of this embodiment is not limited to the above and can be modified as appropriate. For example, the cement-based filler 60 may be filled into the joint between the upper precast connection member 50 and the lower precast connection member 40, and then the cement-based filler 60 may be filled into the mechanical joint 52C.

[0067] (action) Next, the operation of the first embodiment will be described.

[0068] As shown in Figure 1, in the wooden column joint structure according to this embodiment, the lower precast connection member 40 has a first steel connection member 42 and a first concrete section 44 that covers the first steel connection member 42. The first steel connection member 42 is provided with a plurality of connecting bars 42C.

[0069] The multiple connecting bars 42C are attached to the upper surface 10U of the lower wooden column 10 via a base plate 42B. The multiple connecting bars 42C are embedded in the first concrete portion 44 and protrude upward from the upper surface 44U of the first concrete portion 44.

[0070] On the other hand, the upper precast connection member 50 has a second steel connection member 52 and a second concrete portion 54 that covers the second steel connection member 52. The second steel connection member 52 is provided with a plurality of mechanical joints 52C.

[0071] The multiple mechanical joints 52C are attached to the lower surface 20L of the upper wooden column 20 via a base plate 52B. The multiple mechanical joints 52C are also embedded in the second concrete portion 54, and are open to the lower surface 54L of the second concrete portion 54.

[0072] The mechanical joint 52C is filled with cement-based filler 60 with the upper part of the connecting bar 42C of the lower precast connection member 40 inserted therein, thereby connecting the connecting bar 42C and the mechanical joint 52C.

[0073] Additionally, the joint between the first concrete portion 44 of the lower precast connection member 40 and the second concrete portion 54 of the upper precast connection member 50 is filled with cement-based filler 60. As a result, the lower wooden column 10 and the upper wooden column 20 are joined via the lower precast connection member 40, the upper precast connection member 50, and the cement-based filler 60.

[0074] Here, the first steel connection member 42 is covered by the first concrete portion 44, and the second steel connection member 52 is covered by the second concrete portion 54. Therefore, the fire resistance performance of the first steel connection member 42 and the second steel connection member 52 is ensured.

[0075] Furthermore, since the lower precast joint member 40 is manufactured in a factory or the like and attached to the lower wooden pillar 10, there is no need to pour concrete on-site. Similarly, since the upper precast joint member 50 is manufactured in a factory or the like and attached to the lower wooden pillar 10, there is no need to pour concrete on-site. This reduces the effort required to join the lower wooden pillar 10 and the upper wooden pillar 20.

[0076] In this way, in this embodiment, the fire resistance of the joint J between the lower wooden pillar 10 and the upper wooden pillar 20 can be ensured while improving workability.

[0077] In this embodiment, the connecting bars 42C of the lower precast connection member 40 are inserted into the mechanical joints 52C of the upper precast connection member 50, and then the cement-based filler 60 is filled in, making it possible to easily connect the connecting bars 42C and the mechanical joints 52C. This further improves the workability of the joint J between the lower wooden column 10 and the upper wooden column 20.

[0078] Furthermore, the first steel connection member 42 of the lower precast connection member 40 is attached to the upper surface 10U of the lower wooden column 10 by a plurality of first lag screw bolts 12 and bolts 14. This makes it possible to easily attach the lower precast connection member 40 to the lower wooden column 10.

[0079] Similarly, the second steel connection member 52 of the upper precast connection member 50 is attached to the lower surface 20L of the upper wooden column 20 by a plurality of second lag screw bolts 22 and bolts 24. This makes it possible to easily attach the upper precast connection member 50 to the upper wooden column 20.

[0080] Second Embodiment Next, a second embodiment will be described. In the second embodiment, the same components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0081] (Wooden column joint structure) 7 shows a lower wooden column 10 and an upper wooden column 20 to which the wooden column joint structure according to this embodiment is applied. The lower wooden column 10 and the upper wooden column 20 are joined via a joint J.

[0082] (joint) The joint J is interposed between the upper surface 10U of the lower wooden column 10 and the lower surface 20L of the upper wooden column 20. The joint J has a lower precast joint member 40, an upper precast joint member 50, and a cement-based filler 60.

[0083] (Lower precast joint member) A lower precast connection member 40 is provided on the upper surface 10U of the lower wooden pillar 10. The lower precast connection member 40 has a first steel connection member 42 and a first concrete portion 44.

[0084] The first steel connection member 42 is attached to the upper surface 10U of the lower wooden pillar 10. The first steel connection member 42 has a connection body 42A, a base plate 42B, and a pair of first flange plates 42D.

[0085] 7 and 8, the pair of first flange plates 42D are formed of steel plates or the like. The pair of first flange plates 42D face each other in the width direction of the lower wooden pillar 10, and their lower portions are joined to the joint body 42A and the base plate 42B by welding or the like.

[0086] 7, the upper portions of the pair of first flange plates 42D protrude upward from upper surface 44U of first concrete portion 44. The lower portions of a pair of second flange plates 52D, which will be described later, are bolted to the upper portions of the pair of first flange plates 42D.

[0087] It is possible to appropriately change the shape and structure of the first steel connection member 42. The first flange plate 42D is an example of a first steel connection member.

[0088] (Upper precast joint member) An upper precast connection member 50 is provided on the lower surface 20L of the upper wooden column 20. The upper precast connection member 50 has a second steel connection member 52 and a second concrete portion 54.

[0089] The second steel connection member 52 is attached to the lower surface 20L of the upper wooden pillar 20. The second steel connection member 52 has a connection body 52A, a base plate 52B, a pair of second flange plates 52D, and a positioning plate 52E.

[0090] The pair of second flange plates 52D are formed of steel plates, etc. The pair of second flange plates 52D face each other in the width direction of the lower wooden pillar 10, and their upper portions are joined to the joint body 52A and the base plate 52B by welding, etc.

[0091] The lower portions of the pair of second flange plates 52D protrude downward from the lower surface 54L of the second concrete portion 54. The lower portions of the pair of second flange plates 52D are bolted to the upper portions of the pair of first flange plates 42D, respectively, in a state overlapping each other. In other words, the pair of first flange plates 42D and the pair of second flange plates 52D are bolted to the first concrete portion 44 of the lower precast connection member 40 and the second concrete portion 54 of the upper precast connection member 50.

[0092] Specifically, bolt holes are formed in the first flange plate 42D and the second flange plate 52D, respectively. The first flange plate 42D and the second flange plate 52D are joined together by bolts 70 inserted into the bolt holes and nuts 72. The nuts 72 are, for example, weld nuts.

[0093] The positioning plate 52E is formed of a steel plate or the like. The positioning plate 52E is disposed between the pair of second flange plates 52D, and its upper portion is joined to the joint body 52A and the base plate 52B by welding or the like. The positioning plate 52E is an example of a positioning member.

[0094] The lower part of positioning plate 52E protrudes downward from the lower surface 54L of second concrete portion 54. The lower end of this positioning plate 52E is placed via a spacer 62 on the upper surface 44U of first concrete portion 44 of lower precast connection member 40. The pair of first flange plates 42D and the pair of second flange plates 52D are positioned by this positioning plate 52E.

[0095] It is possible to appropriately change the shape and structure of the second steel connection member 52. The second flange plate 52D is an example of a second steel connection member.

[0096] (cement-based filler) The lower end of the positioning plate 52E of the upper precast connection member 50 is placed on the upper surface of the lower precast connection member 40 via a spacer 62. A cement-based filler 60 is filled in the joint (gap) between the upper surface 44U of the first concrete section 44 of the lower precast connection member 40 and the lower surface 54L of the second concrete section 54 of the upper precast connection member 50. In this way, the lower precast connection member 40 and the upper precast connection member 50 are integrated via the cement-based filler 60.

[0097] The upper part of first flange plate 42D and the bolt joints of the lower part of second flange plate 52D are embedded in cement-based filler 60. The lower part of positioning plate 52E and spacer 62 are also embedded in cement-based filler 60.

[0098] (Construction method for wooden column joint structure) Next, an example of a construction method for a wooden column joint structure will be described.

[0099] 9 shows the erected lower wooden pillar 10. A lower precast joint member 40 is attached to the upper surface 10U of the lower wooden pillar 10. An upper precast joint member 50 is attached to the lower surface 20L of the upper wooden pillar 20.

[0100] From this state, first, the upper precast joint member 50 is lifted using a crane or the like (not shown), and as shown in Figure 10, the positioning plate 52E of the upper precast joint member 50 is placed on the upper surface 44U of the first concrete portion 44 of the lower precast joint member 40 via a spacer 62.

[0101] Then, the upper portions of the pair of first flange plates 42D protruding upward from the upper surface 44U of the first concrete portion 44 are overlapped with the lower portions of the pair of second flange plates 52D protruding downward from the lower surface 54L of the second concrete portion 54 of the upper precast connection member 50. In this state, the upper portions of the pair of first flange plates 42D and the lower portions of the pair of second flange plates 52D are joined with bolts 70 and nuts 72.

[0102] Next, as shown in Figure 7, cement-based filler 60 is filled into the joint between the first concrete section 44 of the lower precast connection member 40 and the second concrete section 54 of the upper precast connection member 50. This joins the lower precast connection member 40 and the upper precast connection member 50 via the cement-based filler 60.

[0103] The construction procedure of this embodiment is not limited to the above, and can be modified as appropriate.

[0104] (action) Next, the operation of the second embodiment will be described.

[0105] 7, in the wooden column joint structure according to this embodiment, the lower precast connection member 40 has a first steel connection member 42 and a first concrete section 44 that covers the first steel connection member 42. The first steel connection member 42 is provided with a pair of first flange plates 42D.

[0106] The pair of first flange plates 42D are attached to the upper surface 10U of the lower wooden column 10 via the base plate 42B. The pair of first flange plates 42D also protrude upward from the upper surface 44U of the first concrete portion 44.

[0107] On the other hand, the upper precast connection member 50 has a second steel connection member 52 and a second concrete portion 54 that covers the second steel connection member 52. The second steel connection member 52 is provided with a pair of second flange plates 52D.

[0108] The pair of second flange plates 52D is attached to the lower surface 20L of the upper wooden column 20 via a base plate 52B. The second steel connection member 52 is covered with a second concrete portion 54. The pair of second flange plates 52D protrude downward from the lower surface 54L of the second concrete portion 54.

[0109] The pair of first flange plates 42D and the pair of second flange plates 52D are bolted between the first concrete portion 44 of the lower precast connection member 40 and the second concrete portion 54 of the upper precast connection member 50.

[0110] Additionally, the joint between the first concrete portion 44 of the lower precast connection member 40 and the second concrete portion 54 of the upper precast connection member 50 is filled with cement-based filler 60. As a result, the lower wooden column 10 and the upper wooden column 20 are joined via the lower precast connection member 40, the upper precast connection member 50, and the cement-based filler 60.

[0111] Here, the first steel connection member 42 is covered by the first concrete portion 44, and the second steel connection member 52 is covered by the second concrete portion 54. Therefore, the fire resistance of the first steel connection member 42 and the second concrete portion 54 is ensured.

[0112] Additionally, the upper portions of the pair of first flange plates 42D are covered with the first concrete portion 44 and the cement-based filler 60, and the lower portions of the pair of second flange plates 52D are covered with the second concrete portion 54 and the cement-based filler 60. Therefore, the fire resistance performance of the pair of first flange plates 42D and the pair of second flange plates 52D is also ensured.

[0113] Furthermore, since the lower precast joint member 40 is fabricated in a factory or the like and attached to the lower wooden column 10, there is no need to pour concrete on-site. Similarly, since the upper precast joint member 50 is fabricated in a factory or the like and attached to the lower wooden column 10, there is no need to pour concrete on-site. This reduces the effort required to join the lower wooden column 10 and the upper wooden column 20.

[0114] In this way, in this embodiment, the fire resistance of the joint J between the lower wooden pillar 10 and the upper wooden pillar 20 can be ensured while improving workability.

[0115] In this embodiment, as described above, the pair of first flange plates 42D and the pair of second flange plates 52D are bolted together between the first concrete portion 44 of the lower precast connection member 40 and the second concrete portion 54 of the upper precast connection member 50. This allows the pair of first flange plates 42D and the pair of second flange plates 52D to be easily joined together. This improves the workability of the connection portion J between the lower wooden column 10 and the upper wooden column 20.

[0116] Furthermore, in this embodiment, a positioning plate 52E is provided on the upper precast joint member 50. This positioning plate 52E makes it possible to easily position the pair of first flange plates 42D and the pair of second flange plates 52D, thereby further improving workability.

[0117] In this embodiment, the positioning plate 52E is provided in the upper precast connection member 50 (second steel connection member 52). However, the positioning plate is not limited to the upper precast connection member 50, and may also be provided in the lower precast connection member 40 (first steel connection member 42).

[0118] (Variation) Next, modified examples of the first and second embodiments will be described. Note that, although various modified examples will be described below using the first embodiment as an example, these modified examples can also be applied to the second embodiment as appropriate.

[0119] In the first embodiment described above, connector bar 42C serving as the first steel connector member is provided in lower precast connection member 40, and mechanical joint 52C serving as the second steel connector member is provided in upper precast connection member 50. However, conversely, a mechanical joint serving as the first steel connector member may be provided in lower precast connection member 40, and a connector bar serving as the second steel connector member may be provided in upper precast connection member 50. In other words, in the first embodiment described above, either the first steel connector member or the second steel connector member may be a connector bar, and the other of the first steel connector member or the second steel connector member may be a mechanical joint.

[0120] In the first embodiment, the first steel connection member 42 is attached to the lower wooden column 10 by the first lag screw bolt 12 and the bolt 14. However, the first steel connection member 42 is not limited to the first lag screw bolt 12 and the bolt 14, and may be attached to the lower wooden column 10 by, for example, a steel plate insertion drift pin joint.

[0121] Similarly, in the first embodiment, the second steel connection member 52 is attached to the upper wooden column 20 by the second lag screw bolt 22 and the bolt 24. However, the second steel connection member 52 is not limited to the second lag screw bolt 22 and the bolt 24, and may be attached to the upper wooden column 20 by, for example, a steel plate insertion drift pin joint.

[0122] In the first embodiment, a fire-resistant structure is applied to the lower wooden column 10 and the upper wooden column 20. However, the lower wooden column 10 and the upper wooden column 20 are not limited to a fire-resistant structure, and may be a semi-fire-resistant structure or a non-fire-resistant structure.

[0123] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0124] 10 Lower wooden pillar 10U top 12 First lag screw bolt (first screw member) 20 Upper wooden pillar 20L bottom 22 Second lag screw bolt (second screw member) 40 Lower precast joint member 42C Connecting bar (first steel connecting member) 42D First flange plate (first steel connecting member) 44 First Concrete Section 44U top 50 Upper precast joint member 52C Mechanical joint (secondary steel connecting member) 52D Second flange plate (second steel connecting member) 54 Second Concrete Section 54L bottom surface 60 Cement-based filler

Claims

1. The lower wooden pillar and a lower precast connection member having a first steel connection member attached to an upper surface of the lower wooden column and a first concrete portion covering the first steel connection member; an upper wooden pillar disposed above the lower wooden pillar; an upper precast connection member having a second steel connection member attached to the lower surface of the upper wooden column and connected to the first steel connection member, and a second concrete portion covering the second steel connection member; A cement-based filler filled between the first concrete portion and the second concrete portion; A wooden column joint structure with

2. Either the first steel connection member or the second steel connection member is a connecting reinforcement, The other of the first steel connecting member and the second steel connecting member is a mechanical joint into which the connecting bar is inserted. The wooden column joint structure according to claim 1.

3. the first steel connection member and the second steel connection member are bolted between the first concrete portion and the second concrete portion; The wooden column joint structure according to claim 2.

4. the first steel connecting member is attached to the upper surface of the lower wooden column by a first screw member; The second steel connecting member is attached to the lower surface of the upper wooden column by a second screw member; The wooden column joint structure according to any one of claims 1 to 3.

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