Wooden column and steel beam joint structure

Abstract

To reduce a labor required for joining wooden columns and through steel beams while transmitting axial forces between the wooden columns and the through steel beams.SOLUTION: A wooden column-steel beam joint structure comprises: a through steel beam 10 having a steel pipe joint 20 filled with concrete 22 inside, a lower diaphragm 24 and an upper diaphragm 26 provided at upper and lower ends of the steel pipe joint 20, respectively, and a beam 30 extending out from the steel pipe joint 20; a lower joint tube 40L and an upper joint tube 40U provided in the lower diaphragm 24 and the upper diaphragm 26, respectively; and a lower wooden column 50L and an upper wooden column 50U whose ends are fitted into the lower joint tube 40L and the upper joint tube 40U. respectively.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] BACKGROUND ART Joint structures between wooden columns and steel beams are known (see, for example, Patent Documents 1 and 2).

[0003] In the joint structure disclosed in Patent Document 1, for example, a joint plate protruding from a steel joint member is inserted into a slit formed at the end of a wooden pillar and joined to the wooden pillar by a drift pin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-095768 [Patent Document 2] Japanese Patent Application Publication No. 8-284250 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is a demand for reducing the effort required to join a wooden column to a through steel beam while transmitting axial force between the wooden column and the steel beam.

[0006] Taking the above facts into consideration, the present invention aims to reduce the effort required for joining a wooden column to a through steel beam while transmitting axial force between the wooden column and the through steel beam. [Means for solving the problem]

[0007] The wooden column-to-steel beam connection structure described in claim 1 comprises a through steel beam having a steel pipe connection section filled with concrete inside, diaphragms provided at the upper and lower ends of the steel pipe connection section, and a beam section extending from the steel pipe connection section, a connecting pipe provided at at least one of the upper and lower diaphragms, and a wooden column whose end is fitted into the connecting pipe.

[0008] According to the wooden column to steel beam connection structure of claim 1, the through steel beam has a steel pipe connection part, diaphragms provided at the upper and lower ends of the steel pipe connection part, and a beam part extending from the steel pipe connection part. At least one of the upper and lower diaphragms is provided with a connection pipe.

[0009] The end of the wooden column is fitted into the connecting pipe, which connects the wooden column to the steel pipe joint of the through steel beam via the connecting pipe. This reduces the labor required to connect the wooden column to the through steel beam.

[0010] The inside of the steel pipe connection is filled with concrete, which allows the axial force to be transmitted between the concrete inside the steel pipe connection and the end of the wooden column fitted into the connecting pipe via the diaphragm.

[0011] In this way, the present invention can transmit axial force between the wooden column and the through steel beam while reducing the effort required to join the wooden column and the through steel beam.

[0012] The wooden column-to-steel beam connection structure according to claim 2 is the wooden column-to-steel beam connection structure according to claim 1, wherein an axial force transmission member is provided on the inner wall surface of the steel pipe connection portion.

[0013] According to the wooden column to steel beam connection structure of claim 2, an axial force transmission member is provided on the inner wall surface of the steel pipe connection, so that the axial force transmitted from the end of the wooden column to the concrete inside the steel pipe connection is efficiently transmitted to the steel pipe connection and the beam via the axial force transmission member.

[0014] In this way, the present invention allows the axial force of the wooden column to be efficiently transmitted to the steel beam.

[0015] The wooden column-steel beam connection structure described in claim 3 is the wooden column-steel beam connection structure described in claim 1 or claim 2, in which the wooden column has a wooden core whose end is fitted into the connection pipe, and a fire-resistant covering that provides a fire-resistant covering to the wooden core.

[0016] According to the wooden column-to-steel beam connection structure of claim 3, the wooden column has a wooden core and a fire-resistant coating. The end of the wooden core is fitted into the connecting pipe. This allows the wooden column to be connected to the steel pipe connection of the through steel beam via the connecting pipe. This reduces the effort required to connect the wooden column to the through steel beam.

[0017] The wood core is covered with a fire-resistant covering, which enhances the fire resistance of the wooden column.

[0018] In this way, the present invention can improve the fire resistance of wooden columns while reducing the effort required to join wooden columns to through steel beams. [Effects of the Invention]

[0019] As described above, according to the present invention, it is possible to transmit axial force between a wooden column and a through steel beam while reducing the effort required for joining the wooden column and the through steel beam. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is an elevation view showing a through steel beam, a lower wooden column, and an upper wooden column to which a wooden column-steel beam joint structure according to the first embodiment is applied. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 10 is an elevation view showing a through steel beam, a lower wooden column, and an upper wooden column to which a wooden column-steel beam joint structure according to a second embodiment is applied. [Figure 4]FIG. 10 is an elevation view showing a through steel beam, a lower wooden column, and an upper wooden column to which a modified example of a wooden column-steel beam joint structure according to the second embodiment is applied. [Figure 5] FIG. 10 is an elevation view showing a through steel beam, a lower wooden column, and an upper wooden column to which a wooden column-steel beam joint structure according to a third embodiment is applied. [Figure 6] FIG. 10 is an elevation view showing a through steel beam and an upper wooden column to which a modified example of a wooden column steel beam joint structure according to the third embodiment is applied. [Figure 7] FIG. 10 is an elevation view showing a through steel beam and an upper wooden column to which a modified example of a wooden column steel beam joint structure according to the third embodiment is applied. [Figure 8] FIG. 10 is an elevation view showing a through steel beam and a lower wooden column to which a modified example of a wooden column steel beam connection structure according to the third embodiment is applied. DETAILED DESCRIPTION OF THE INVENTION

[0021] (First embodiment) First, the first embodiment will be described.

[0022] (Wood column steel beam joint structure) 1 shows a through steel beam 10, a lower wooden column 50L, and an upper wooden column 50U to which the wooden column-steel beam connection structure according to the first embodiment is applied. The lower wooden column 50L and the upper wooden column 50U are examples of wooden columns.

[0023] (Through steel beam) The through steel beam 10 is arranged between the column capital of the lower wooden column 50L and the column base (end) of the upper wooden column 50U. The through steel beam 10 has a steel pipe connection portion 20, concrete 22, a lower diaphragm 24, an upper diaphragm 26, multiple beam portions 30, a lower connecting pipe 40L, and an upper connecting pipe 40U.

[0024] The lower diaphragm 24 and the upper diaphragm 26 are examples of upper and lower diaphragms. The lower connecting pipe 40L and the upper connecting pipe 40U are examples of connecting pipes.

[0025] The steel pipe connection 20 is the joint (connection) between the lower wooden column 50L and the upper wooden column 50U in the through steel beam 10, and is located between the capital (end) of the lower wooden column 50L and the base (end) of the upper wooden column 50U. The steel pipe connection 20 is formed into a cylindrical shape using a square steel pipe and is located with its axial direction in the up-down direction. Concrete 22 is filled inside the steel pipe connection 20.

[0026] A lower diaphragm 24 is provided at the lower end of the steel pipe connection portion 20. On the other hand, an upper diaphragm 26 is provided at the upper end of the steel pipe connection portion 20. The lower diaphragm 24 and the upper diaphragm 26 are formed from steel plates or the like, and face each other with the steel pipe connection portion 20 in between.

[0027] The lower end of the steel pipe connection portion 20 is joined by welding or the like while abutting against the upper surface of the lower diaphragm 24. As a result, the opening on the lower end side of the steel pipe connection portion 20 is closed by the lower diaphragm 24. A lower joining pipe 40L, which will be described later, is provided on the lower surface of the lower diaphragm 24.

[0028] The upper end of the steel pipe connection portion 20 is joined by welding or the like while abutting against the underside of the upper diaphragm 26. As a result, the opening on the upper end side of the steel pipe connection portion 20 is closed by the upper diaphragm 26. An upper joining pipe 40U, which will be described later, is provided on the upper surface of the upper diaphragm 26.

[0029] A filling hole 28 that leads to the inside of the steel pipe connection portion 20 is formed in the center of the upper diaphragm 26. The filling hole 28 is a circular through-hole that penetrates the upper diaphragm 26 in the thickness direction. The concrete 22 described above is filled into the inside of the steel pipe connection portion 20 through this filling hole 28. Note that the filling hole for the concrete 22 is not limited to being formed in the upper diaphragm 26, and may be formed in the steel pipe connection portion 20, for example.

[0030] The beams 30 are formed from H-shaped steel beams and extend outward from the side surfaces of the steel pipe connection 20. Each beam 30 has a pair of lower and upper flanges 32, 34 that face each other in the vertical direction, and a web 36 that connects the lower and upper flanges 32, 34.

[0031] The end of the lower flange portion 32 is joined by welding or the like in abutting relation to the end of the lower diaphragm 24. Similarly, the end of the upper flange portion 34 is joined by welding or the like in abutting relation to the end of the upper diaphragm 26. The end of the web portion 36 is joined by welding or the like in abutting relation to the side surface of the steel pipe connection portion 20.

[0032] The length of the beam portion 30 can be changed as appropriate. At least one beam portion 30 can be provided in the steel pipe connection portion 20.

[0033] (Lower joint pipe, upper joint pipe) The lower connecting pipe 40L and the upper connecting pipe 40U are cylindrically formed from square steel pipes and are arranged with their axial direction in the up-down direction. The lower connecting pipe 40L and the upper connecting pipe 40U are arranged coaxially with the steel pipe connection part 20, on both sides of the steel pipe connection part 20 in the axial direction.

[0034] The cross-sectional shape and size of the lower connecting pipe 40L and the upper connecting pipe 40U are the same as the cross-sectional shape and size of the steel pipe joint portion 20. The lower connecting pipe 40L, the steel pipe joint portion 20, and the upper connecting pipe 40U are arranged so as to be continuous in the axial direction.

[0035] The cross-sectional shapes and sizes of the steel pipe connection portion 20, the lower connecting pipe 40L, and the upper connecting pipe 40U may be different.

[0036] The upper end of the lower connecting pipe 40L is joined by welding or the like while abutting against the underside of the lower diaphragm 24. As shown in Fig. 2, the cross-sectional shape of the lower connecting pipe 40L is the same as that of the lower wooden column 50L, and the cross-sectional size of the lower connecting pipe 40L is slightly larger than that of the lower wooden column 50L. The column capital of the lower wooden column 50L, which will be described later, is fitted inside this lower connecting pipe 40L.

[0037] 1, the lower end of the upper connecting pipe 40U is joined by welding or the like while abutting against the upper surface of the upper diaphragm 26. The cross-sectional shape of the upper connecting pipe 40U is the same as that of the upper wooden column 50U, and the cross-sectional size of the upper connecting pipe 40U is slightly larger than that of the upper wooden column 50U. The column base of the upper wooden column 50U, which will be described later, is fitted inside this upper connecting pipe 40U.

[0038] The height (axial length) H1 of the lower connecting pipe 40L is, for example, 1 / 3 or less of the column width W1 of the column capital of the lower wooden column 50L. Similarly, the height (axial length) H2 of the upper connecting pipe 40U is, for example, 1 / 3 or less of the column width W2 of the column capital of the upper wooden column 50U.

[0039] (Lower wooden pillar, upper wooden pillar) The lower wooden column 50L and the upper wooden column 50U are formed into a rectangular column shape using wood or wood material. The lower wooden column 50L is disposed below the steel pipe connection portion 20.

[0040] The column capital of the lower wooden column 50L is fitted inside the lower connecting pipe 40L, and its upper end surface is in contact with the underside of the lower diaphragm 24. This allows the column capital of the lower wooden column 50L to be joined to the steel pipe connection portion 20 via the lower connecting pipe 40L.

[0041] As shown in Fig. 1, the upper wooden column 50U is disposed above the steel pipe connection portion 20. The upper wooden column 50U, the steel pipe connection portion 20, and the lower wooden column 50L are disposed coaxially.

[0042] The base of the upper wooden column 50U is fitted inside the upper connecting pipe 40U, and its lower end surface is in contact with the upper surface of the upper diaphragm 26. This allows the base of the upper wooden column 50U to be joined to the steel pipe connection portion 20 via the upper connecting pipe 40U. In addition, the upper wooden column 50U and the lower wooden column 50L are joined to each other via the steel pipe connection portion 20.

[0043] If a gap is formed between the inner peripheral surface of the lower connecting pipe 40L and the outer peripheral surface of the capital part of the lower wooden column 50L, a gap filler such as a filler plate or a wedge may be inserted into the gap. This allows the inner peripheral surface of the lower connecting pipe 40L and the outer peripheral surface of the capital part of the lower wooden column 50L to be tightly attached to each other via the gap filler.

[0044] Similarly, if a gap is formed between the inner peripheral surface of the upper connecting pipe 40U and the outer peripheral surface of the base of the upper wooden column 50U, a gap filler such as a filler plate or a wedge may be inserted into the gap, thereby bringing the inner peripheral surface of the upper connecting pipe 40U and the outer peripheral surface of the base of the upper wooden column 50U into tight contact with each other via the gap filler.

[0045] In this embodiment, the cross-sectional shapes and sizes of the lower wooden column 50L and the upper wooden column 50U are the same. However, the cross-sectional shapes and sizes of the lower wooden column 50L and the upper wooden column 50U may be different. In this case, the cross-sectional shapes and sizes of the lower connecting pipe 40L and the upper connecting pipe 40U are appropriately set according to the cross sections of the lower wooden column 50L and the upper wooden column 50U.

[0046] (action) Next, the operation of the first embodiment will be described.

[0047] 1, according to this embodiment, a through steel beam 10 has a steel pipe connection portion 20, a lower diaphragm 24 and an upper diaphragm 26 provided at the upper and lower ends of the steel pipe connection portion 20, respectively, and a beam portion 30 extending from the steel pipe connection portion 20. In addition, a lower connecting pipe 40L is provided in the lower diaphragm 24, and an upper connecting pipe 40U is provided in the upper diaphragm 26.

[0048] The column capital of the lower wooden column 50L is fitted into the lower connecting pipe 40L. This allows the lower wooden column 50L to be joined to the steel pipe connection portion 20 of the through steel beam 10 via the lower connecting pipe 40L. This reduces the effort required to join the lower wooden column 50L and the through steel beam 10.

[0049] Furthermore, fitting the column capital of the lower wooden column 50L into the lower connecting pipe 40L suppresses displacement of the lower wooden column 50L relative to the steel pipe connection portion 20. In other words, shear force is transmitted between the lower connecting pipe 40L and the column capital of the lower wooden column 50L.

[0050] Similarly, the column base of the upper wooden column 50U is fitted into the upper connecting pipe 40U. This allows the upper wooden column 50U to be joined to the steel pipe connection 20 of the through steel beam 10 via the upper connecting pipe 40U. This reduces the effort required to join the upper wooden column 50U and the through steel beam 10.

[0051] Furthermore, fitting the base of the upper wooden column 50U into the upper connecting pipe 40U suppresses displacement of the upper wooden column 50U relative to the steel pipe connection portion 20. In other words, shear force is transmitted between the upper connecting pipe 40U and the base of the upper wooden column 50U.

[0052] Furthermore, concrete 22 is filled inside the steel pipe connection part 20. As a result, the axial force N is transmitted from the column base of the upper wooden column 50U via the upper diaphragm 26 to the concrete 22 inside the steel pipe connection part 20. The axial force N transmitted to the concrete 22 is then transmitted to the lower wooden column 50L via the lower diaphragm 24.

[0053] In this way, in this embodiment, the axial force N can be transmitted between the lower wooden column 50L and the upper wooden column 50U and the through steel beam 10, while reducing the effort required for joining the lower wooden column 50L and the upper wooden column 50U to the through steel beam 10.

[0054] Furthermore, with the column head of the lower wooden column 50L fitted inside the lower connecting pipe 40L, the upper end surface of the lower wooden column 50L is brought into contact with the lower surface of the lower diaphragm 24, thereby transmitting a bending moment between the lower wooden column 50L and the lower diaphragm 24. Furthermore, a shear force is also transmitted by the frictional force generated between the upper end surface of the lower wooden column 50L and the lower surface of the lower diaphragm 24.

[0055] Similarly, with the column base of the upper wooden column 50U fitted inside the upper connecting pipe 40U, the lower end surface of the upper wooden column 50U is brought into contact with the upper surface of the upper diaphragm 26, whereby a bending moment is transmitted between the upper wooden column 50U and the upper diaphragm 26. Furthermore, a shear force is also transmitted by the frictional force generated between the lower end surface of the upper wooden column 50U and the upper surface of the upper diaphragm 26.

[0056] 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.

[0057] (Wood column steel beam joint structure) FIG. 3 shows a through steel beam 10, a lower wooden column 50L, and an upper wooden column 50U to which a wooden column-steel beam joint structure according to the second embodiment is applied.

[0058] (Through steel beam) A slab 60 is provided on top of the through steel beam 10. The slab 60 covers (fire-resistant covering) the upper surface of the through steel beam 10 and the upper surface of the upper diaphragm 26. The slab 60 also covers (fire-resistant covering) the outer peripheral surface of the upper connecting pipe 40U. In other words, the upper connecting pipe 40U is buried in the slab 60.

[0059] The through steel beam 10 is fire-resistant coated with a fire-resistant coating material 12. The fire-resistant coating material 12 is, for example, sprayed rock wool or wrapped fire-resistant coating material. This fire-resistant coating material 12 provides fire-resistant coating to the entire through steel beam 10 except for the upper surface. The fire-resistant coating material 12 also provides fire-resistant coating to the outer surface of the steel pipe connection portion 20, the lower surface of the lower diaphragm 24, and the outer surface of the lower connecting pipe 40L.

[0060] (Lower wooden pillar, upper wooden pillar) The lower wooden column 50L and the upper wooden column 50U have a fire-resistant structure. The lower wooden column 50L and the upper wooden column 50U have the same configuration. Therefore, the following description will focus on the configuration of the lower wooden column 50L, and will omit a description of the configuration of the upper wooden column 50U as appropriate.

[0061] The lower wooden column 50L has a wood core 52 that supports a load (vertical load) and a fire-resistant covering 54 that provides a fire-resistant covering to the wood core 52.

[0062] (woody heart) The wood core 52 is formed into a rectangular pillar shape using wood or a wood material, and is arranged along the material axis direction of the lower wooden column 50L. The wood core 52 is formed so as to be able to support the load (long-term load and short-term load) borne by the lower wooden column 50L.

[0063] The column capital of the lower wooden column 50L is not provided with a fire-resistant covering 54, which will be described later, and the column capital (end) of this wooden core 52 is exposed. The column capital (end) of this wooden core 52 is fitted into the lower connecting pipe 40L.

[0064] Similarly, the wood core 52 at the base of the upper wooden column 50U is not provided with a fire-resistant covering 54, and the wood core 52 is exposed. The base (end) of this wood core 52 is fitted into the upper connecting pipe 40U.

[0065] (Fire-resistant coating) The fire-resistant covering 54 provides a fire-resistant covering to the wood core 52, thereby enhancing the fire resistance of the wood core 52. The fire-resistant covering 54 has a fire-retardant layer 56 that covers the wood core 52, and a substitute fire layer 58 that covers the fire-retardant layer 56.

[0066] (Burning-stop layer) The fire-retardant layer 56 is formed in a cylindrical shape surrounding the woody core 52, and covers the entire side surface of the woody core 52. This fire-retardant layer 56 stops the combustion of the substitute fire layer 58 in the event of a fire (spontaneous extinguishing), and is a layer that suppresses the combustion of the woody core 52.

[0067] The fire-retardant layer 56 is a high-heat-capacity layer (heat-capacity type) with a larger heat capacity than the wood core 52. This fire-retardant layer 56 has hardened cement bodies and wood materials arranged alternately around the circumference of the wood core 52. The hardened cement bodies and wood materials are arranged along the material axis direction of the lower wooden column 50L and are joined to the side of the wood core 52 with an adhesive or the like.

[0068] The hardened cement material is made of, for example, hardened mortar, grout, or concrete, and has a larger heat capacity than wood material. By arranging this hardened cement material and wood material alternately, the heat capacity of the fire-retardant layer 56 as a whole is larger than the heat capacity of the wood core 52 and the substitute fire layer 58.

[0069] In the fire-retardant layer 56, instead of the hardened cement and wood material, for example, gypsum and wood material can be arranged alternately.

[0070] (Stolen layer) A wooden sub-combustible layer 58 is provided on the outside of the fire-retardant layer 56. The sub-combustible layer 58 is formed in a cylindrical shape that surrounds the fire-retardant layer 56 and covers the entire side surface of the fire-retardant layer 56. This sub-combustible layer 58 burns in the event of a fire and forms a carbonized layer (thermal insulating layer), thereby preventing the heat of the fire from penetrating into the woody core 52.

[0071] The sub-combustible layer 58 is formed from a wooden material such as laminated lumber, and is joined to the side of the fire-stopping layer 56 with an adhesive or the like. The thickness (layer thickness) of this sub-combustible layer 58 is set appropriately according to the required fire resistance performance (fire resistance time) required for the lower wooden column 50L, and the burning speed and heat-shielding performance of the sub-combustible layer 58.

[0072] The fire-resistant coating portion 54 can be configured with at least one of a fire-stopping layer 56 and a substitute layer 58.

[0073] (action) Next, the operation of the second embodiment will be described.

[0074] As shown in Fig. 3, in this embodiment, the lower wooden column 50L has a wood core 52 and a fire-resistant covering 54. The column capital (upper end) of the wood core 52 is fitted into the lower connecting pipe 40L. This allows the lower wooden column 50L to be joined to the steel pipe connection 20 of the through steel beam 10 via the lower connecting pipe 40L. This reduces the effort required to join the lower wooden column 50L and the through steel beam 10.

[0075] Similarly, the upper wooden column 50U has a wood core 52 and a fire-resistant covering 54. The column base (lower end) of the wood core 52 is fitted into the upper connecting pipe 40U. This allows the upper wooden column 50U to be joined to the steel pipe connection 20 of the through steel beam 10 via the upper connecting pipe 40U. This reduces the effort required to join the upper wooden column 50U and the through steel beam 10.

[0076] Furthermore, the wood cores 52 of the lower wooden columns 50L and the upper wooden columns 50U are fire-resistant covered with fire-resistant covering portions 54. This improves the fire resistance of the lower wooden columns 50L and the upper wooden columns 50U.

[0077] Furthermore, the lower connecting pipe 40L is fire-resistant coated by the fire-resistant coating material 12 of the through steel beam 10, and the upper connecting pipe 40U is fire-resistant coated by the slab 60. This further improves the fire resistance performance of the lower wooden column 50L and the upper wooden column 50U.

[0078] In this way, in this embodiment, the fire resistance of the lower wooden column 50L and the upper wooden column 50U can be improved while reducing the effort required for joining the lower wooden column 50L and the upper wooden column 50U to the through steel beam 10.

[0079] In this embodiment, the upper surfaces of the through steel beams 10 and the upper surfaces of the upper diaphragms 26 are covered (fire-resistant covered) by the slab 60. However, for example, when the slab 60 is not present, as in the modified example shown in Fig. 4, the upper surfaces of the through steel beams 10 and the upper surfaces of the upper diaphragms 26 may be fire-resistant covered by the fire-resistant covering material 12 of the through steel beams 10.

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

[0081] (Wood column steel beam joint structure) 5 shows a through steel beam 10 to which a wooden column-steel beam joint structure according to the third embodiment is applied, and an upper wooden column 50U. In this embodiment, the lower wooden column 50L is omitted, and the upper wooden column 50U is a so-called hill column.

[0082] (Through-joint steel beam) As described above, in this embodiment, the lower wooden column 50L is omitted. Therefore, the lower connecting pipe 40L of the through steel beam 10 is also omitted. Meanwhile, a plurality of reinforcing bars 70 are welded to the inner wall surface of the steel pipe connection portion 20. The reinforcing bars 70 are an example of an axial force transmission member.

[0083] A plurality of reinforcing bars 70 extend circumferentially around the steel pipe connection 20 and are spaced apart in the vertical direction on each inner wall surface of the steel pipe connection 20. Each reinforcing bar 70 is joined by welding or the like while abutting against the inner wall surface of the steel pipe connection 20, and is embedded in the concrete 22 filled inside the steel pipe connection 20. These reinforcing bars 70 increase the efficiency of transmission of the axial force N between the steel pipe connection 20 and the concrete 22.

[0084] (action) Next, the operation of the third embodiment will be described.

[0085] 5, in this embodiment, the upper wooden column 50U is a raised column. In this case, the axial force N of the upper wooden column 50U is transmitted to the concrete 22 via the upper diaphragm 26. The axial force N transmitted to the concrete 22 is then transmitted to the steel pipe connection 20 and the beam 30 via the multiple reinforcing bars 70 and the lower diaphragm 24.

[0086] In this manner, in this embodiment, by providing a plurality of reinforcing bars 70 on the inner wall surface of the steel pipe connection portion 20, the transmission efficiency of the axial force N between the upper wooden column 50U and the through steel beam 10 is improved. Therefore, the amount of deflection of the through steel beam 10 can be efficiently reduced.

[0087] In this embodiment, the axial force transmission member is a reinforcing bar 70. However, the axial force transmission member is not limited to the reinforcing bar 70, and may be, for example, a headed stud, a flat bar, or the like.

[0088] 6 and 7, it is also possible to fireproof cover the through steel beam 10 with a fireproof covering material 12 and a slab 60, and apply a fireproof structure to the upper wooden column 50U.

[0089] In addition, although the lower wooden column 50L is omitted in this embodiment, the upper wooden column 50U and upper connecting pipe 40U may be omitted on the top floor of the structure, for example, as in the modified example shown in Figure 8. In this case, for example, the load of the slab 80 installed on the through steel beam 10 is transmitted as an axial force N to the lower wooden column 50L via the concrete 22 inside the steel pipe connection part 20.

[0090] In this way, at least one of the lower connecting pipe 40L and the upper connecting pipe 40U can be provided at the steel pipe connection portion 20 of the through steel beam 10.

[0091] (Variation) Next, modified examples of the first to third 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 and third embodiments as appropriate.

[0092] In the first embodiment, the heights H1, H2 of the lower connecting pipe 40L and the upper connecting pipe 40U are low. However, for example, it is also possible to set the height H1 of the lower connecting pipe 40L equal to or greater than the column width W1 of the column capital of the lower wooden column 50L, thereby transmitting bending moments and shear forces between the lower connecting pipe 40L and the column capital of the lower wooden column 50L. Similarly, it is also possible to set the height H2 of the upper connecting pipe 40U equal to or greater than the column width W2 of the column base of the upper wooden column 50U, thereby transmitting bending moments and shear forces between the upper connecting pipe 40U and the column base of the upper wooden column 50U.

[0093] In the first embodiment, the steel pipe connection portion 20 is formed of a square steel pipe. However, the steel pipe connection portion 20 is not limited to a square steel pipe, and may be formed of, for example, a round steel pipe.

[0094] In the first embodiment, the lower connecting pipe 40L and the upper connecting pipe 40U are formed of square steel pipes. However, the cross-sectional shapes and sizes of the lower connecting pipe 40L and the upper connecting pipe 40U can be changed as appropriate depending on the cross-sectional shapes and sizes of the lower wooden column 50L and the upper wooden column 50U.

[0095] 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]

[0096] 10 through steel beams 20 Steel pipe connection 22 Concrete 24 Lower diaphragm (diaphragm) 26 Upper diaphragm (diaphragm) 30 Beam section 40L Lower joint pipe (joint pipe) 40U upper joint pipe (joint pipe) 50L Lower wooden pillar (wooden pillar) 50U upper wooden pillar (wooden pillar) 52 Woody heart 54 Fireproof coating section 70 Reinforcement bars (axial force transmission members)

Claims

1. a through steel beam having a steel pipe connection portion filled with concrete inside, diaphragms provided at the upper and lower ends of the steel pipe connection portion, and a beam portion extending from the steel pipe connection portion; a connecting pipe provided on at least one of the upper and lower diaphragms; a wooden pole whose end is fitted into the connecting pipe; A wooden column and steel beam joint structure.

2. An axial force transmission member is provided on the inner wall surface of the steel pipe connection portion. The wooden column steel beam joint structure according to claim 1.

3. The wooden pillar is a wood core portion whose end is fitted into the connecting pipe; a fire-resistant covering portion that fire-resistantly covers the wood core portion; having The wooden column steel beam joint structure according to claim 1 or 2.

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