Wooden column steel joint structure

Abstract

To suppress lowering of fire resistance of a wooden column while joining the wooden column to a steel joint member.SOLUTION: A joint structure of a wooden column and a steel joint member comprises: a wooden column 10; a precast concrete member 30 mounted on the wooden column 10; a steel joint member 40 mounted on the precast concrete member 30; a bolt member 20 penetrating the precast concrete member 30 and joining the wooden column 10 and the steel joint member 40; and a fire-resistant coating member 50 for applying a fire-resistant coating on the upper end side of the bolt member 20 upwardly protruding from the precast concrete member 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wooden column-to-steel connection member joining structure. [Background technology]

[0002] A joint structure between a wooden column and a steel joint member is known (for example, see Patent Document 1). In this joint structure, the steel joint member is placed on the wooden column via a fire-resistant material made of concrete. This reduces the heat of fire transferred from the steel joint member to the wooden column in the event of a fire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-048471 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology disclosed in Patent Document 1, the wooden column and the steel joint member are joined by PC steel rods that penetrate the fireproof material. Therefore, in the event of a fire, the heat of the fire is transferred to the wooden column through the PC steel rods. As a result, the fire resistance of the wooden column may be reduced.

[0005] In consideration of the above-mentioned facts, the present invention aims to suppress a decrease in the fire resistance of a wooden column while joining a wooden column to a steel joint member. [Means for solving the problem]

[0006] According to the first aspectThe wooden column-steel joint member connection structure comprises a wooden column, a precast concrete member placed on the wooden column, a steel joint member placed on the precast concrete member, a bolt member that penetrates the precast concrete member and joins the wooden column and the steel joint member, and a fire-resistant covering member that provides fire-resistant covering for the upper end side of the bolt member protruding upward from the precast concrete member.

[0007] First aspect According to the above-mentioned wooden column-steel joint structure, a precast concrete member is placed on the wooden column. A steel joint member is placed on the precast concrete member. The wooden column and the steel joint member are joined by a bolt member that penetrates the precast concrete member.

[0008] Here, by interposing a precast concrete member between the wooden column and the steel joint member, the heat of fire transmitted from the steel joint member to the wooden column during a fire is reduced. In addition, the upper end side of the bolt member protruding upward from the precast concrete member is fire-resistant coated with a fire-resistant coating member. This reduces the heat of fire transmitted to the wooden column via the bolt member during a fire. Therefore, the deterioration of the fire resistance of the wooden column is suppressed.

[0009] In this way, the present invention makes it possible to join a wooden column and a steel joint member using a bolt member while suppressing a decrease in the fire resistance of the wooden column.

[0010] According to the second aspect The wooden column steel joint structure is as follows: According to the first aspect In a wood column-to-steel joint member connection structure, the fire-resistant covering member provides fire-resistant covering to the upper end side of the bolt member and the steel joint member.

[0011] Second aspectAccording to the above-mentioned wooden column-steel joint structure, the upper end of the bolt member and the steel joint member are fire-resistant covered by the fire-resistant covering member. This further reduces the heat of fire transmitted to the wooden column through the upper end of the bolt member and the steel joint member in the event of a fire. This further suppresses the deterioration of the fire resistance of the wooden column.

[0012] According to the third aspect The wooden column steel joint structure is as follows: First aspect or According to the second aspect In the wood column-steel joint member connection structure, the fire-resistant covering member is grout, mortar, concrete, or a self-leveling material.

[0013] Third aspect According to the above-mentioned steel-to-wood joint structure, the fire-resistant covering material is grout, mortar, concrete, or a self-leveling material, so that the upper end side of the bolt member can be easily fire-resistant covered by the fire-resistant covering material. Effect of the Invention

[0014] As described above, according to the present invention, it is possible to join a wooden column and a steel joint member while suppressing a decrease in the fire resistance of the wooden column. [Brief description of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view taken along line 1-1 of FIG. 3 showing a wooden column and a steel joint member to which a wooden column-steel joint member joining structure according to one embodiment is applied. FIG. [Diagram 2] 2 is a cross-sectional view taken along line 2-2 of FIG. 1. [Diagram 3] FIG. 2 is a plan view (top view) showing the steel connection member shown in FIG. [Figure 4] 2 is a cross-sectional view corresponding to FIG. 1, showing the base of the wooden column shown in FIG. [Diagram 5] 5 is a cross-sectional view taken along line 5-5 of FIG. 4. [Figure 6] 6 is a cross-sectional view taken along line 6-6 in FIG. [Figure 7]5 is a cross-sectional view corresponding to FIG. 4 showing the construction procedure for the base of a wooden column. [Figure 8] 5 is a cross-sectional view corresponding to FIG. 4 showing the construction procedure for the base of a wooden column. [Figure 9] FIG. 2 is a cross-sectional view corresponding to FIG. 1 showing the construction procedure for the capital part of a wooden column. [Figure 10] FIG. 2 is a cross-sectional view corresponding to FIG. 1 showing the construction procedure for the capital part of a wooden column. [Figure 11] FIG. 2 is a cross-sectional view corresponding to FIG. 1 showing the construction procedure for the capital part of a wooden column. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a wooden column-to-steel joint member connection structure according to one embodiment will be described with reference to the drawings.

[0017] FIG. 1 shows a column capital part of a wooden column 10 to which a wooden column-steel connection member joining structure according to this embodiment is applied, a precast concrete member 30, and a steel connection member 40.

[0018] (wooden pillar) As shown in Fig. 2, the wooden column 10 is formed in a cylindrical shape. A fire-resistant structure is applied to the wooden column 10. The wooden column 10 has a wood core 12 that supports a load, a fire-resistant coating part 14 that provides a fire-resistant coating to the wood core 12, and a finish part 16 that covers the fire-resistant coating part 14.

[0019] The wooden core (load-bearing part) 12 is made of a wooden material such as laminated lumber or solid wood. The wooden core 12 extends in the axial direction of the wooden column 10 and has a circular cross-sectional shape. The wooden core 12 is formed to be capable of bearing (supporting) the load (long-term load and short-term load) borne by the wooden column 10.

[0020] As shown in Fig. 1, a steel connection member 40 (described later) is joined to the wood core 12 via a plurality of bolt members 20. The bolt members 20 are, for example, metal lag screws. The lower end of each bolt member 20 is inserted into a mounting hole formed in the upper end surface of the wood core 12. In this state, the bolt members 20 are fixed to the wood core 12 by filling the mounting holes with a filler such as grout.

[0021] The upper ends of the multiple bolt members 20 extend upward from the upper surface of the wood core portion 12 and penetrate in the vertical direction through a precast concrete member 30 described below.

[0022] The fire-resistant coating 14 is formed, for example, from a gypsum-based self-leveling material hardened into a cylindrical shape. The fire-resistant coating 14 is arranged along the outer periphery of the woody core 12, and completely covers the side surface (circumferential side surface) of the woody core 12. This fire-resistant coating 14 stops the combustion of the finish section 16 in the event of a fire (natural fire extinguishing) and functions as a fire-stopping section (fire-stopping layer) that suppresses the combustion of the woody core 12.

[0023] The fire-resistant covering portion 14 is not limited to a self-leveling material, and may be formed of, for example, grout, mortar, concrete, or the like.

[0024] The finishing part (decorative part) 16 is formed, for example, from a cylindrical piece of wood. This finishing part 16 is disposed along the outer periphery of the fire-resistant covering part 14, and covers the entire side surface (circumferential side surface) of the fire-resistant covering part 14. By covering and hiding the fire-resistant covering part 14 with this finishing part 16, the design of the wooden column 10 is improved.

[0025] (Precast concrete components) The precast concrete member 30 is, for example, made of reinforced concrete and is formed in a factory or the like. The precast concrete member 30 is formed in a plate shape. A plurality of through holes 32 are formed in the precast concrete member 30. The plurality of through holes 32 are circular holes that penetrate the precast concrete member 30 in the thickness direction.

[0026] The precast concrete member 30 is placed on the upper surface of the wooden column 10 with the upper ends of the multiple bolt members 20 protruding from the upper surface of the wood core 12 passing through the multiple through holes 32. In this state, the precast concrete member 30 is joined to the wood core 12 of the wooden column 10 via the multiple bolt members 20 by filling the through holes 32 with a filler such as grout. A steel connection member 40 is placed on top of this precast concrete member 30.

[0027] (Steel joint components) As shown in Fig. 3, the steel connection member 40 has a plurality of beams 42, a plurality of side plates 44, and a plurality of top plates 46. The plurality of beams 42 are formed of H-shaped steel. Moreover, the plurality of beams 42 are joined in a cross shape in a plan view. The intersections (joints) of these beams 42 form a connection portion 40S of the steel connection member 40. Moreover, the beam portion 40T of the steel connection member 40 is formed by the extensions of the beams 42 extending laterally from the connection portion 40S.

[0028] As shown in FIG. 1, the beam 42 has an upper flange portion 42A and a lower flange portion 42B that face each other in the vertical direction, and a web portion 42C that connects the upper flange portion 42A and the lower flange portion 42B.

[0029] The lower flange portion 42B of the beam 42 is formed with a plurality of mounting holes into which the bolt members 20 are inserted. The mounting holes are circular holes that penetrate the lower flange portion 42B in the thickness direction. The steel joint member 40 is joined to the wood core portion 12 of the wooden column 10 via the plurality of bolt members 20 by tightening nuts 22 on the upper ends of the bolt members 20 inserted into these mounting holes.

[0030] As shown in Fig. 3, the multiple side plates 44 function as a formwork for forming a filling chamber R for a fire-resistant covering member 50 (see Fig. 1), described below, around the joint portion 40S of the steel joint member 40. These side plates 44 are made of steel plates or the like, and are arranged in an octagonal shape in plan view so as to surround the joint portion 40S of the steel joint member 40. Each side plate 44 is arranged across the web portions 42C of adjacent beams 42, and is joined to the web portions 42C by welding or the like.

[0031] The multiple top plates 46 function as lids covering each of the filling chambers R from above. Each top plate 46 is disposed across the upper flange portions 42A of adjacent beam members 42 and is joined to the upper flange portions 42A by welding or the like. A filling hole 48 is formed in each of the top plates 46. The filling hole 48 is a circular hole that penetrates the top plate 46 in the thickness direction and communicates with the filling chamber R. Fire-resistant covering members 50 are filled into the filling chambers R through these filling holes 48.

[0032] In this embodiment, as shown in Figure 1, a side plate 44 is provided on the underside of the steel joint member 40, and a filling chamber R is also formed between the underside of the steel joint member 40 and the upper surface of the precast concrete member 30.

[0033] (Fire-resistant covering material) The fire-resistant covering member 50 is, for example, grout. The fire-resistant covering member 50 is filled into the filling chamber R through filling holes 48 (see FIG. 3) formed in the top plate 46, and provides fire-resistant covering for the joint portion 40S of the steel joint member 40. The fire-resistant covering member 50 also provides fire-resistant covering for the upper ends of the multiple bolt members 20 protruding upward from the precast concrete member 30, and the nuts 22.

[0034] (Joint structure of wooden column base) Next, the joint structure of the column base of the wooden column 10 will be described.

[0035] As shown in Fig. 4, the base of the wooden column 10 is joined to the lower column 60 via a bolt member 90 and a filler 76. The lower column 60 is a steel column formed from a round steel pipe. The joint 60S of the lower column 60 is reinforced by a pair of diaphragms 62 facing each other in the vertical direction.

[0036] 5, the joint portion 60S of the lower pillar 60 is reinforced by a rib 64. The rib 64 is joined in a cross shape in a plan view, and is provided inside the joint portion 60S.

[0037] 4, a beam 70 is joined to the joint portion 60S of the lower column 60. The beam 70 is a steel beam formed from an H-shaped steel, and has an upper flange portion and a lower flange portion that face each other in the vertical direction, and a web portion that connects the upper flange portion and the lower flange portion.

[0038] A slab 72 is provided on the beam 70. An opening 74 is formed in the slab 72. The opening 74 is formed, for example, in a circular shape, and is formed above the joint portion 60S of the lower column 60. The joint portion 60S of the lower column 60 is exposed from this opening 74. The opening 74 is filled with a filler material 76, which will be described later.

[0039] A steel bracket 80 is provided on the upper surface of the connection portion 60S of the lower column 60. The bracket 80 has a leg 82 and a flange 84. As shown in Fig. 6, the leg 82 is formed of H-shaped steel (cross H) joined in a cross shape in a plan view, and is joined to the upper surface of the connection portion 60S by welding or the like. The flange 84 is provided on the upper surface of the leg 82.

[0040] 4, the flange portion 84 is formed in a rectangular plate shape in a plan view and is disposed substantially horizontally. A plurality of through holes into which bolt members 90 are respectively inserted are formed in the flange portion 84. The plurality of through holes are circular holes that penetrate the flange portion 84 in the thickness direction. The bolt members 90 are inserted into these through holes.

[0041] The bolt member 90 is, for example, a metal lag screw. The lower end side of the bolt member 90 is inserted into a through hole of the flange portion 84. In this state, the bolt member 90 is fixed to the flange portion 84 by tightening a nut 92 onto the lower end side of the bolt member 90.

[0042] The multiple bolt members 90 extend upward from the flange portion 84 and are inserted into mounting holes 94 (see FIG. 7) formed in the underside of the wood core 12 of the wooden column 10. In this state, the bolt members 90 are fixed to the wood core 12 of the wooden column 10 by filling the mounting holes 94 with a filler such as grout. The underside of the wooden column 10 is located at a position spaced upward from the top surface of the joint portion 60S of the lower column 60.

[0043] The opening 74 of the slab 72 is filled with a filler 76. The filler 76 is, for example, grout, mortar, concrete, or a self-leveling material. The filler 76 fills the gap between the lower surface of the wooden column 10 and the upper surface of the joint portion 60S of the lower column 60.

[0044] The bracket 80, the lower end side of the bolt member 90, and the nut 92 are embedded in the filler 76. The filler 76 provides a fire-resistant coating to the bracket 80, the lower end side of the bolt member 90, and the nut 92.

[0045] (Wooden pillar construction method) Next, an example of a method for constructing a wooden pillar will be described.

[0046] First, a method for joining the lower column 60 and the wooden column 10 will be described. Fig. 7 shows the lower column 60 with a beam 70 joined to the joint portion 60S. A slab 72 is provided on the beam 70. Furthermore, a plurality of bolt members 90 are attached to the bracket 80 of the lower column 60.

[0047] From this state, first, the wooden pillar 10 is suspended above the lower pillar 60, and multiple bolt members 90 are inserted into multiple mounting holes 94 (see FIG. 7) formed in the lower surface of the wood core 12, as shown in FIG. 8. In this state, the multiple mounting holes 94 are filled with a filler material (not shown) and allowed to harden. As a result, the wooden pillar 10 is joined to the lower pillar via the multiple bolt members 90.

[0048] 4, the opening 74 of the slab 72 is filled with a filler 76 and allowed to harden. As a result, the gap between the joint 60S of the lower column 60 and the base of the wooden column 10 is filled with the filler 76, and the lower column 60 and the wooden column 10 are joined together. In addition, the bracket 80, the lower end side of the bolt member 90, and the nut 92 are embedded in the filler 76 and are fire-resistant coated with the filler 76.

[0049] Next, a method for joining the wooden pillar 10 and the steel joint member 40 will be described. Fig. 9 shows the wooden pillar 10 with multiple bolt members 20 attached. From this state, a precast concrete member 30 is suspended and lowered onto the wooden pillar 10. Then, as shown in Fig. 10, the precast concrete member 30 is placed on the upper surface of the wooden pillar 10 with the multiple bolt members 20 passing through the through holes 32 of the precast concrete member 30.

[0050] Next, a filler such as grout (not shown) is filled into the through hole 32. In this way, the precast concrete member 30 is joined to the wood core 12 of the wooden column 10 via the multiple bolt members 20.

[0051] Next, as shown in Fig. 11, the steel connection member 40 is suspended and lowered onto the precast concrete member 30. Then, with the upper ends of the bolt members 20 passing through the mounting holes in the lower flange portion 42B, the steel connection member 40 is placed on the precast concrete member 30. Next, nuts 22 are tightened onto the upper ends of the bolt members 20, respectively. This joins the steel connection member 40 to the wooden column 10 via the bolt members 20.

[0052] Next, as shown in Fig. 3, a fire-resistant covering member 50 is filled into the filling chamber R through a filling hole 48 formed in the top plate 46 of the steel connection member 40. As a result, the gap between the lower surface of the steel connection member 40 and the upper surface of the precast concrete member 30 is filled with the fire-resistant covering member 50, as shown in Fig. 1. In addition, the connection portion 40S of the steel connection member 40 is embedded in the fire-resistant covering member 50 and is fire-resistant covered by the fire-resistant covering member 50.

[0053] The above construction method can be modified as appropriate, and the construction procedures can be interchanged or performed in parallel.

[0054] (effect) Next, the effects of this embodiment will be described.

[0055] According to this embodiment, a precast concrete member 30 is placed on a wooden column 10. In addition, a steel connection member 40 is placed on the precast concrete member 30. The wooden column 10 and the steel connection member 40 are joined by a bolt member 20 that penetrates the precast concrete member 30.

[0056] Here, by interposing the precast concrete member 30 between the wooden column 10 and the steel connection member 40, the fire heat transferred from the steel connection member 40 to the wooden column 10 in the event of a fire is reduced. In addition, the upper end side of the bolt member 20 protruding upward from the precast concrete member 30 is fire-resistant coated with a fire-resistant coating member 50. This also reduces the fire heat transferred to the wooden column 10 via the bolt member 20 in the event of a fire. Therefore, the deterioration of the fire resistance of the wooden column 10 is suppressed.

[0057] In this manner, in this embodiment, the wooden column 10 and the steel joint member 40 are joined by the bolt member 20 while suppressing a decrease in the fire resistance of the wooden column 10.

[0058] In addition, the joint portion 40S of the steel joint member 40 is fire-resistant covered by the fire-resistant covering member 50. This reduces the heat of fire transmitted to the wooden column 10 via the joint portion 40S of the steel joint member 40 during a fire. This further prevents the fire resistance of the wooden column 10 from deteriorating.

[0059] Furthermore, the fire-resistant covering member 50 is made of grout. This makes it possible to easily provide fire-resistant covering to the upper end side of the bolt member 20 and the connection portion 40S of the steel connection member 40 by the fire-resistant covering member 50.

[0060] Moreover, the steel connection member 40 is placed on the upper surface of the wooden column 10 via the precast concrete member 30. As a result, in this embodiment, the level of the steel connection member 40 can be easily adjusted compared to when the steel connection member 40 is directly placed on the upper surface of the wooden column 10.

[0061] Furthermore, the precast concrete member 30 also functions as a bottom formwork for the filling chamber R. Therefore, the workability of the steel connection member 40 is improved.

[0062] Although not specifically described in the above embodiment, in order to ensure an approach for a tool for tightening the nut 22, a closable opening may be provided in the side plate 44.

[0063] (Modification) Next, a modification of the above embodiment will be described.

[0064] In the above embodiment, the joint portion 40S of the steel connection member 40 is fire-resistant coated with the fire-resistant coating member 50. However, the fire-resistant coating member 50 is not limited to the joint portion 40S of the steel connection member 40, and may be used to fire-resistant coat the joint portion of the steel connection member 40 with the bolt member 20, i.e., the lower flange portion 42B of the beam member 42. Also, the fire-resistant coating of the steel connection member 40 can be omitted.

[0065] In the above embodiment, the fire-resistant covering member 50 is grout. However, the fire-resistant covering member 50 is not limited to grout, and may be mortar, concrete, a self-leveling material, or the like.

[0066] In the above embodiment, four beam portions 40T are provided in the steel connection member 40. However, the number of beam portions 40T provided in the steel connection member 40 can be changed as appropriate, and the steel connection member 40 can be provided with one or more beam portions 40T. It is also possible to omit the beam portions 40T from the steel connection member 40 and join a beam to the connection portion 40S.

[0067] The steel joint member means a member formed of steel material such as steel frame, which constitutes a joint between a wooden column and a beam. As described above, the steel joint member may be formed integrally with at least a part of the beam, or may not be formed integrally with at least a part of the beam.

[0068] In the above embodiment, the wooden column 10 has a three-layer structure of the wooden core 12, the fireproof coating 14, and the finish 16. However, the structure of the wooden column 10 can be modified as appropriate. For example, the wooden column may be provided with a fireproof layer. The wooden column may also have a non-fireproof structure. Note that the wooden column refers to a column in which the core (wooden core) that supports the load is at least made of wood material.

[0069] In the above embodiment, the bolt members 20, 90 are lag screws. However, the bolt members 20, 90 are not limited to lag screws and may be, for example, stud bolts or anchor bolts.

[0070] 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 is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0071] 10 wood pillar 20 Bolt member 30 Precast concrete members 40 Steel joint components 50 Fire-resistant covering materials

Claims

1. Wooden pillars and A precast concrete member placed on the wooden column; A steel connection member placed on the precast concrete member; and a bolt member that is fixed to the wooden column, passes through a through hole formed in the precast concrete member and filled with a filler, and joins the wooden column and the steel joint member; a fire-resistant covering member for covering an upper end side of the bolt member protruding upward from the precast concrete member; A wooden column-steel joint member connection structure.

2. The fire-resistant coating member provides fire-resistant coating to the upper end side of the bolt member and the steel connection member. The wooden column-to-steel joint member connection structure according to claim 1.

3. The fire-resistant covering member is made of grout, mortar, concrete, or a self-leveling material. To be done, A wooden column-to-steel joint member connection structure according to claim 1 or 2.

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