Wooden column joint member joint structure, construction method of precast joint member, and precast joint member

Abstract

To improve workability while securing fire resistance performance of a steel joint member.SOLUTION: A wooden column joint member joint structure includes: a lower side wooden column 10 where a lag screw bolt 12 is provided on an upper end surface 10U; and a precast joint member 60 having a steel joint member 70 which is placed on the upper end surface 10U of the lower side wooden column 10, and which is joined to the lag screw bolt 12 by a bolt 84, and a precast concrete part 62 having a work hole 74H for storing the bolt 84 on an upper surface 62U, and for covering the steel joint member 70.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a wooden column-joint member joint structure, a construction method for a precast joint member, and a precast joint member. [Background technology]

[0002] A wooden column joint structure is known that includes a lower wooden column, a metal joint member joined to the upper end surface of the lower wooden column, and concrete as a fire-resistant covering material that provides a fire-resistant covering for the joint member (see, for example, Patent Document 1).

[0003] Also known is a beam-column joint structure in which a wooden column member and a steel beam member are joined via a joint member made of a material harder than wood (see, for example, Patent Document 2).

[0004] Furthermore, a beam-column frame is known in which a through steel beam is arranged between a lower wooden column and an upper wooden column (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-095768 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-133278 [Patent Document 3] Japanese Patent Publication No. 2023-009651 Summary of the Invention [Problem to be solved by the invention]

[0006] It is possible to join a wooden column and a steel connection member such as a steel frame placed on the wooden column with a lag screw bolt. From the viewpoint of fire resistance, it is also possible to cover the steel connection member with concrete or the like.

[0007] Specifically, the lower base plate of the steel connection element is bolted to a lag screw bolt installed on the upper end surface of the wooden column. In this state, a formwork is temporarily set up around the steel connection element, and concrete is poured into the formwork to cover the steel connection element with concrete.

[0008] However, applying fire-resistant covering materials such as concrete on-site is time-consuming.

[0009] In consideration of the above, the present invention aims to improve workability while ensuring the fire resistance of steel connection members. [Means for solving the problem]

[0010] The wooden column joint member connection structure described in claim 1 comprises a wooden column having a fixing member provided on its upper end surface, a steel joint member placed on the upper end surface of the wooden column and joined to the fixing member by a connector, and a precast joint member having a working hole on its upper surface to accommodate the connector and a fire-resistant covering portion that covers the steel joint member.

[0011] According to the wooden column joint member connection structure of claim 1, a fixing member is provided on the upper end surface of the wooden column. The precast joint member has a steel joint member and a fire-resistant covering. The steel joint member is placed on the upper end surface of the wooden column and joined to the fixing member with a connector. The fire-resistant covering has an access hole on its upper surface to accommodate the connector and covers the steel joint member.

[0012] By covering the steel joint member with the fire-resistant covering of the precast joint member in this way, the fire resistance performance of the steel joint member can be ensured while reducing the effort required to temporarily set up and remove formwork on site.

[0013] The fire-resistant coating of the precast joint member has a work hole on the top surface to accommodate a fastener. By attaching the fastener to the fixing member through this work hole, the steel joint member can be joined to the fixing member provided on the upper end surface of the wooden column.

[0014] Therefore, it is possible to improve workability while ensuring the fire resistance of the steel joint member.

[0015] The wooden column joint member connection structure described in claim 2 is the wooden column joint member connection structure described in claim 1, in which the steel joint member has a through hole in which the fixing member is placed in a planar view and has a lower base plate placed on the upper end surface of the wooden column, and a hollow member embedded in the fire-resistant covering part, connected to the through hole of the lower base plate, and forming the working hole.

[0016] According to the wooden column joint member joining structure of claim 2, the steel joint member has a lower base plate and a hollow member. The lower base plate has a through hole in which a fixing member is placed in a plan view and is placed on the upper end surface of the wooden column. The hollow member is embedded in the fire-resistant covering and is connected to the through hole of the lower base plate, and forms a working hole.

[0017] By embedding the hollow member in the fire-resistant covering in this manner, working holes for accommodating the connectors can be easily formed in the fire-resistant covering.

[0018] The wooden column joint member connection structure described in claim 3 is the wooden column joint member connection structure described in claim 1 or claim 2, in which the steel joint member has a through hole opposite the work hole and has an upper base plate placed on the upper surface of the fire-resistant covering part.

[0019] According to the wooden column connection member joining structure of claim 3, the steel connection member has an upper base plate. The upper base plate has a through hole facing the working hole of the fire-resistant covering part and is placed on the upper surface of the fire-resistant covering part.

[0020] Here, for example, a column that stands on the precast connection member can be joined to the upper base plate.

[0021] Furthermore, for example, a tool for operating the connector or an operating rod of the tool can be inserted into the working hole in the fire-resistant covering portion through the through-hole in the upper base plate, thereby improving workability.

[0022] The construction method of a precast joint member described in claim 4 comprises an installation step of placing a steel joint member covered with a fire-resistant coating portion of a precast joint member on the upper end surface of a wooden column and, in a plan view, arranging a fixing member provided on the upper end surface of the wooden column within a work hole on the upper surface of the fire-resistant coating portion; and a joining step of attaching a connector to the fixing member from above the upper surface of the fire-resistant coating portion through the work hole and joining the steel joint member to the fixing member.

[0023] According to the construction method of the precast connection member of claim 4, first, in the installation step, the steel connection member covered with the fire-resistant covering of the precast connection member is placed on the upper end surface of the wooden column, and the fixing member provided on the upper end surface of the wooden column is placed in the working hole in the upper surface of the fire-resistant covering in a plan view. Next, in the joining step, a connector is attached to the fixing member from above the upper surface of the fire-resistant covering through the working hole, and the steel connection member is joined to the fixing member.

[0024] By covering the steel joint member with the fire-resistant covering of the precast joint member in this way, the fire resistance performance of the steel joint member can be ensured while reducing the effort required to temporarily set up and remove formwork on site.

[0025] In addition, by attaching a connector to the fixing member through the working hole on the top surface of the fire-resistant covering portion, the steel joint member can be joined to the fixing member provided on the upper end surface of the wooden column.

[0026] Therefore, it is possible to improve workability while ensuring the fire resistance of the steel joint member.

[0027] The precast joint member described in claim 5 comprises a steel joint member that is placed on the upper end surface of a wooden column and joined to a fixing member provided on the upper end surface by a fastener, and a fire-resistant covering portion that has a working hole on its upper surface to accommodate the fastener and covers the steel joint member.

[0028] According to the precast connection member of claim 5, the steel connection member is placed on the upper end surface of the wooden column and joined to the fixing member provided on the upper end surface with a connector. The fire-resistant covering has an access hole on its upper surface for accommodating the connector and covers the steel connection member.

[0029] By covering the steel joint member with the fire-resistant covering in this manner, the fire resistance performance of the steel joint member can be ensured while reducing the effort required for temporary installation and removal of formwork on site.

[0030] The fire-resistant covering also has access holes on its top surface to accommodate fasteners. By attaching the fasteners to the fixing members through these access holes, the steel connection members can be joined to the fixing members provided on the upper end surfaces of the wooden columns.

[0031] Therefore, it is possible to improve workability while ensuring the fire resistance of the steel joint member. [Effects of the Invention]

[0032] As described above, according to the present invention, it is possible to improve workability while ensuring the fire resistance of steel connection members. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a lower wooden column, an upper wooden column, two steel beams, and a precast joint member to which a wooden column joint member connection structure according to one embodiment is applied. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] 2 is a vertical cross-sectional view showing the construction process of the precast joint member shown in FIG. 1. FIG. [Figure 4]FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. [Figure 5] FIG. 4 is a plan view (top view) of the precast connection member shown in FIG. 3. [Figure 6] 2 is a vertical cross-sectional view showing the construction process of the precast joint member shown in FIG. 1. FIG. [Figure 7] 2 is a vertical cross-sectional view showing the construction process of the precast joint member shown in FIG. 1. FIG. [Figure 8] 2 is a vertical cross-sectional view showing the construction process of the precast joint member shown in FIG. 1. FIG. [Figure 9] 2 is a vertical cross-sectional view showing the construction process of the precast joint member shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0034] Hereinafter, an embodiment will be described with reference to the drawings.

[0035] (Wooden column-joint structure) 1 shows a lower wooden column 10, an upper wooden column 20, two steel beams 40, and a precast connection member 60 to which the wooden column connection member joining structure according to this embodiment is applied. The lower wooden column 10 is an example of a wooden column. The upper wooden column 20 is an example of a column, and the steel beam 40 is an example of a beam.

[0036] (Lower wooden pillar, upper wooden pillar) The lower end of the upper wooden column 20 is joined to the upper end of the lower wooden column 10 via a precast joint member 60. The basic configurations of the lower wooden column 10 and the upper wooden column 20 are the same. Therefore, the following will describe the configuration of the lower wooden column 10, and will omit a description of the configuration of the upper wooden column 20.

[0037] As shown in Figure 2, the lower wooden column 10 is formed in a rectangular column shape. The lower wooden column 10 has a fire-resistant structure. The lower wooden column 10 has a wood core 30 that supports the load and a fire-resistant coating layer 32 that provides a fire-resistant coating to the wood core 30.

[0038] (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-sectional shape. 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.

[0039] (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.

[0040] (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.

[0041] 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 wood pieces 34A and hardened bodies 34B arranged alternately on the outer surface of the wood core 30. Each wood piece 34A and hardened body 34B is arranged along the material axis direction of the lower wooden column 10.

[0042] 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.

[0043] (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 and forms a carbonized layer (thermal insulating layer), thereby preventing the heat of the fire from reaching the woody core 30. It is considered to be a layer that suppresses infiltration.

[0044] 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.

[0045] The thickness (layer thickness) of the sub-combustible 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 sub-combustible layer 36, and the heat-shielding performance.

[0046] In this embodiment, the fire-resistant coating layer 32 is composed of the fire-stopping layer 34 and the sub-combustible layer 36, but one of the fire-stopping layer 34 and the sub-combustible 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 modified as appropriate.

[0047] (lag screw bolt) 3, a plurality of lag screw bolts 12 are provided on the upper end surface 10U of the lower wooden column 10 to which steel connection members 70 of the precast connection member 60 (described later) are joined. The plurality of lag screw bolts 12 transmit tensile force between the lower wooden column 10 and the steel connection member 70, for example.

[0048] Specifically, the upper end surface of the wood core 30 of the lower wooden column 10 is positioned lower than the upper end surface of the fire-resistant coating layer 32, and a step is formed between the upper end surfaces of the wood core 30 and the fire-resistant coating layer 32. In other words, the upper end of the fire-resistant coating layer 32 of the lower wooden column 10 protrudes above the upper end surface of the wood core 30 and forms a tubular portion with a rectangular cross section. The lower end of a precast joint member 60, which will be described later, is inserted into the inside of the upper end (tubular portion) of this fire-resistant coating layer 32.

[0049] In this embodiment, a step is formed between the upper end surface of the wood core 30 and the upper end surface of the fire-resistant coating layer 32. However, the upper end surfaces of the wood core 30 and the fire-resistant coating layer 32 may be, for example, substantially flush with each other.

[0050] A lag screw bolt 12 is provided at each corner of the wood core 30 of the lower wooden column 10. The lag screw bolt 12 is screwed into and fixed to the wood core 30 so that its head (upper end) does not protrude from the upper end surface 10U of the lower wooden column 10.

[0051] The head of the lag screw bolt 12 forms a joint 12A that is exposed from the upper end surface 10U of the lower wooden column 10. The joint 12A is shaped like a nut and has a female thread in the center into which a bolt 84 (described later) is fastened.

[0052] It is possible to appropriately change the arrangement and number of the lag screw bolts 12. The lag screw bolts 12 are an example of a fixing member, and the bolts 84 are an example of a connector.

[0053] As shown in Figure 1, a plurality of lag screw bolts 22 are provided on the lower end surface of the upper wooden column 20 to which the steel connection member 70 of the precast connection member 60 is joined. The plurality of lag screw bolts 22 transmit tensile force between the upper wooden column 20 and the steel connection member 70, for example.

[0054] Specifically, the lower end surface of the wood core 30 of the upper wooden column 20 is positioned at the same position as the lower end surface of the fire-resistant coating layer 32, and is approximately flush with it. Lag screw bolts 22 are provided at each corner of the lower end surface of this wood core 30.

[0055] The lag screw bolt 22 is screwed into and fixed to the wood core 30 so that its head (lower end) does not protrude from the lower end surface of the upper wooden column 20. The head of the lag screw bolt 22 forms a joint 22A that is exposed from the lower end surface 20L of the upper wooden column 20. The joint 22A is shaped like a nut and has a female thread (threaded hole) in its center into which a bolt 94, described later, is fastened.

[0056] It is possible to appropriately change the arrangement and number of the lag screw bolts 22. The lag screw bolts 22 are an example of a fixing member, and the bolts 94 are an example of a connector.

[0057] (steel beam) The two steel beams 40 are arranged on either side of the precast joint member 60 and are joined to the lower wooden column 10 and the upper wooden column 20 via the precast joint member 60. The steel beam 40 is also installed between the lower wooden column 10 and a column (not shown) and supports the slab 50.

[0058] The steel beam 40 is formed of, for example, an H-shaped steel beam. The steel beam 40 has a pair of flange portions 42 that face each other in the vertical direction, and a web portion 44 that connects the pair of flange portions 42.

[0059] The end of the steel beam 40 is joined to a gusset plate portion 72A of the precast connection member 60, which will be described later. Specifically, the web portion 44 at the end of the steel beam 40 is joined (bolted) to the gusset plate portion 72A with the web portion 44 overlapping the gusset plate portion 72A using a plurality of bolts 46 and nuts.

[0060] The steel beams 40 are fire-resistant coated with a fire-resistant coating material (not shown). In this embodiment, two steel beams 40 are joined to the precast connection member 60. However, at least one steel beam 40 can be joined to the precast connection member 60.

[0061] (Slab) The slab 50 is made of reinforced concrete and has a plurality of slab reinforcements (not shown) buried inside it. The slab 50 is provided on the steel beams 40 and is supported by the steel beams 40.

[0062] (Precast joint members) As shown in Figure 3, the precast connection member 60 is made of half-precast concrete. The precast connection member 60 is made of steel-reinforced concrete. The precast connection member 60 includes a steel connection member 70, a precast concrete section 62, and a cast-in-place concrete section 64 (see Figure 1).

[0063] In this embodiment, the finishing material 66 is provided around the precast connection member 60, but the finishing material 66 can be omitted as appropriate. The precast concrete portion 62 is an example of a fire-resistant covering portion.

[0064] (Steel connection components) The steel joint component 70 has a joint body 72, a lower base plate 80, and an upper base plate 90. As shown in Figures 4 and 5, the joint body 72 is formed, for example, from steel plates joined in a cross shape in a plan view. The joint body 72 also has four gusset plate portions 72A.

[0065] 3, each gusset plate portion 72A is formed from a steel plate or the like, and protrudes laterally (to both sides) from the joint body 72. Furthermore, each gusset plate portion 72A protrudes laterally (toward the steel beam 40) beyond a lower base plate 80 and an upper base plate 90, which will be described later, and an end of the steel beam 40 is joined to each gusset plate portion 72A.

[0066] 1, the tip end of the gusset plate portion 72A is joined to the web portion 44 of the steel beam 40 by a bolt 46 and a nut (not shown) while overlapping the web portion 44. Note that the joining of the gusset plate portion 72A and the steel beam 40 is not limited to bolt joining, and may also be done by welding, for example.

[0067] The shape of the joint body 72 is not limited to a cross shape in plan view, and may be, for example, a cylindrical shape in plan view, etc. The joint body 72 may be provided with at least one gusset plate portion 72A.

[0068] As shown in Figure 3, a lower base plate 80 is provided at the lower end of the joint body 72. The lower base plate 80 is formed from a rectangular steel plate or the like. This lower base plate 80 is placed on the upper end surface of the lower wooden column 10. More specifically, the lower base plate 80 is inserted inside the upper end (tubular portion) of the fire-resistant coating layer 32, which protrudes above the upper end surface of the wood core 30 of the lower wooden column 10, and is placed with its underside overlapping the upper end surface of the wood core 30.

[0069] At each corner of the lower base plate 80, a through-hole 82 is formed to expose the joint 12A of the lag screw bolt 12 provided on the upper end surface of the wood core 30 of the lower wooden column 10. Each through-hole 82 is a circular hole that penetrates the lower base plate 80 in the thickness direction.

[0070] 6, with the lower base plate 80 placed on the upper end surface of the lower wooden column 10, the joints 12A of the lag screw bolts 12 are positioned in each through-hole 82 in plan view. Then, as shown in Fig. 7, by screwing a bolt (middle bolt) 84 through the through-hole 82 into the joints 12A of the lag screw bolts 12, the lower base plate 80 is joined to the lag screw bolts 12 and the steel connection member 70 is joined to the lower wooden column 10.

[0071] As shown in Figure 8, an upper base plate 90 is provided at the upper end of the joint body 72. The upper base plate 90 is formed from a rectangular steel plate or the like. The lower end surface of the upper wooden post 20 is placed on the upper base plate 90. More specifically, the lower end surface of the wood core 30 of the upper wooden post 20 is placed on the top surface of the upper base plate 90.

[0072] At each corner of the upper base plate 90, a through-hole 92 is formed to expose the joint 22A of the lag screw bolt 22 provided on the lower end surface of the wood core 30 of the upper wooden column 20. Each through-hole 92 is a circular hole that penetrates the upper base plate 90 in the thickness direction.

[0073] Here, with the lower end surface of the upper wooden column 20 placed on the upper base plate 90, the joint portion 22A of the lag screw bolt 22 is arranged in each through-hole 92 in plan view. By screwing a bolt (middle bolt) 94 through this through-hole 92 into the joint portion 22A of the lag screw bolt 22, the upper base plate 90 is joined to the lag screw bolt 22 and the upper wooden column 20 is joined to the steel connection member 70.

[0074] (Precast concrete section) The precast concrete section 62 is formed into a rectangular parallelepiped shape using precast concrete. This precast concrete section 62 is formed, for example, by pouring concrete into a formwork that is temporarily installed along the outer periphery of the lower base plate 80 of the steel connection member 70.

[0075] The planar shape and size of the precast concrete section 62 are similar to those of the lower base plate 80 and upper base plate 90 of the steel connection member 70. This precast concrete section 62 rises from the upper surface of the lower base plate 80, and covers the lower end and middle section of the connection body 72. In addition, gusset plate sections 72A of the connection body 72 protrude from each side surface 62S of the precast concrete section 62.

[0076] The precast concrete section 62 is provided on the lower base plate 80 with a gap (space) between it and the underside of the upper base plate 90. In other words, the upper base plate 90 is disposed on the upper surface 62U of the precast concrete section 62 and faces the upper surface 62U of the precast concrete section 62. As a result, the upper end of the joint body 72 is not covered by the precast concrete section 62 and is exposed from the precast concrete section 62. The upper end of this joint body 72 is covered by a cast-in-place concrete section 64, which will be described later.

[0077] The shape of the precast concrete section 62 is not limited to a rectangular parallelepiped, and can be changed as appropriate depending on the shape of the steel connection member 70.

[0078] (Hollow member) As shown in Figure 7, a plurality of work holes 74H for operating bolts 84 are formed in the upper surface 62U of the precast concrete section 62. The plurality of work holes 74H are through holes that pass through the precast concrete section 62 in the vertical direction. Each work hole 74H is formed by embedding a hollow member 74 in the precast concrete section 62.

[0079] 4, the hollow member 74 is formed of a cylindrical tube (sleeve) or the like that can accommodate a bolt 84 therein. The hollow member 74 stands on the through-hole 82 of the lower base plate 80, and its lower end is joined to the periphery of the through-hole 82 by welding or the like. As a result, the working hole 74H of the hollow member 74 is connected to the through-hole 82.

[0080] As shown in Figure 7, the upper end of the hollow member 74 reaches the upper surface 62U of the precast concrete section 62. A through hole 92 in an upper base plate 90 is disposed above the upper end of this hollow member 74. The through hole 92 in the upper base plate 90 faces the work hole 74H in the vertical direction. This allows an operating rod 102 of a tool 100 that operates a bolt 84 to be inserted into the work hole 74H via the through hole 92 in the upper base plate 90, as shown in Figure 7.

[0081] In this embodiment, for example, the tool 100 and the operating rod 102 are detachable via a connector 104. This makes it easier to insert the operating rod 102 into the through-hole 92 of the upper base plate 90.

[0082] The configurations of the tool 100 and the operating rod 102 can be changed as appropriate. For example, the connector 104 may be omitted and the tool 100 and the operating rod 102 may be integrated.

[0083] (Cast-in-place concrete section) 1 and 8, the cast-in-place concrete section (top concrete section) 64 is formed of cast-in-place concrete. This cast-in-place concrete section 64 is formed, for example, by pouring cast-in-place concrete between the upper surface 62U of the precast concrete section 62 and the lower surface of the upper base plate 90.

[0084] When pouring in-place concrete onto the upper surface 62U of the precast concrete section 62, the gap between the upper surface 62U of the precast concrete section 62 and the upper surface of the steel beam 40 is sealed with a plate 52, as described below.

[0085] The planar shape and size of the cast-in-place concrete section 64 are the same as those of the precast concrete section 62. The cast-in-place concrete section 64 is provided across the upper surface 62U of the precast concrete section 62 and the lower surface of the upper base plate 90, and covers the upper end of the joint body 72.

[0086] Here, when pouring cast-in-place concrete onto the upper surface of the precast concrete section 62, the work holes 74H of the plurality of hollow members 74 may also be filled with cast-in-place concrete. This improves the fire resistance of the hollow members 74.

[0087] The working holes 74H of the hollow members 74 do not necessarily have to be filled with concrete, but may be filled with concrete as needed. Also, the working holes 74H of the hollow members 74 may be filled with mortar, grout, or the like, instead of concrete.

[0088] (Construction method for precast joint components) Next, an example of a construction method for precast joint members will be described.

[0089] (Installation process) First, the installation process will be explained. Figure 3 shows the lower wooden pillar 10 after it has been erected. In the installation process, the precast joint member 60 is lifted from this state using a crane or the like (not shown) and placed on the upper end surface of the lower wooden pillar 10.

[0090] Specifically, as shown in Figure 6, the lower end of the precast connection member 60 is inserted inside the upper end (tubular portion) of the fire-resistant coating layer 32 of the lower wooden column 10, and the lower base plate 80 of the precast connection member 60 is placed on the upper end surface of the wood core part 30 of the lower wooden column 10. At this time, in a plan view, the joint parts 12A of the lag screw bolts 12 provided on the upper end surface of the wood core part 30 are respectively positioned in the multiple through holes 82 of the lower base plate 80 and the multiple working holes 74H of the precast connection member 60.

[0091] (Joining process) Next, the joining process will be described. In the joining process, as shown in Figure 7, bolts 84 are inserted into each of the work holes 74H in the precast connection members 60. Next, the operating rod 102 of a tool 100 is inserted into the work holes 74H via the through-holes 92 in the upper base plate 90 of the precast connection members 60. Then, the bolts 84 are operated with the tool 100, and the bolts 84 are screwed into the joint portions 12A of the lag screw bolts 12 via the through-holes 82 in the lower base plate 80.

[0092] As a result, the lower base plate 80 is joined to the lag screw bolt 12 by the bolt 84, and the precast connection member 60 is joined to the lower wooden column 10.

[0093] (Beam installation process) Next, the beam installation process will be described. In the beam installation process, as shown in Fig. 8, the steel beam 40 is lifted by a crane or the like (not shown) and placed next to the precast connection member 60. Then, the web portion 44 at the end of the steel beam 40 is placed on the gusset plate portion 72A of the precast connection member 60, and joined with bolts 46 and nuts (not shown).

[0094] (Upper wooden pillar installation process) Next, the upper wooden column installation process will be described. In the upper wooden column installation process, the upper wooden column 20 is lifted up by a lifting machine or the like (not shown), and the lower end surface of the upper wooden column 20 is placed on the upper base plate 90 of the precast connection member 60.

[0095] Specifically, the lower end surface of the wood core 30 of the upper wooden column 20 is placed on the upper surface of the upper base plate 90 of the precast joint member 60. At this time, in a plan view, the joint portions 22A of the lag screw bolts 22 provided on the upper end surface of the upper wooden column 20 are placed inside the multiple through holes 92 of the upper base plate 92. In this state, bolts 94 are screwed into the joint portions 22A of the lag screw bolts 22 from below the upper base plate 90, through each through hole 92.

[0096] As a result, the bolts 94 join the upper base plate 90 to the lag screw bolts 22, and also join the upper wooden column 20 to the precast connection member 60. If the diameter of the through-hole 92 in the upper base plate 90 is increased to allow the tool 100 to be inserted into the through-hole 92, the bolts 94 are inserted into the through-hole 92 via a washer or the like, for example.

[0097] (Cast-in-place concrete pouring process) Next, the step of pouring the cast-in-place concrete will be described. In the step of pouring the cast-in-place concrete, the cast-in-place concrete portion 64 of the precast connection member 60 and the slab 50 are integrally constructed as shown in FIG.

[0098] Specifically, a closing plate 52 is erected between the upper surface 62U of the precast concrete portion 62 of the precast joint member 60 and the upper surface of the steel beam 40, thereby closing the gap between the upper surface 62U of the precast concrete portion 62 and the upper surface of the steel beam 40.

[0099] Furthermore, a bottom formwork such as a deck plate (not shown) is erected on the top surface of the steel beam 40, and slab reinforcement (not shown) is arranged on the bottom formwork. In this state, cast-in-place concrete is poured onto the top surface of the precast concrete section 62, the closing plate 52, and the bottom formwork. As a result, a cast-in-place concrete section 64 is formed on the precast concrete section 62, and the slab 50 is formed.

[0100] The cast-in-place concrete is poured onto the precast concrete section 62 so that it reaches the lower end surface 20L of the upper wooden column 20. As a result, the upper end of the joint body 72 of the steel connection member 70, the upper base plate 90, and the heads of the bolts 94 are embedded in the cast-in-place concrete section 64. In other words, the upper end of the joint body 72 of the steel connection member 70, the upper base plate 90, and the heads of the bolts 94 are covered (fire-resistant covered) by the cast-in-place concrete section 64.

[0101] (Finishing process) Next, the finishing process will be described. In the finishing process, as shown in Figure 1, finishing material 66 is placed around the precast concrete portion 62 of the precast connection member 60, and the precast concrete portion 62 is covered with the finishing material 66. Note that the finishing material 66 may be provided as needed, and can be omitted as appropriate.

[0102] (action) Next, the operation of this embodiment will be described.

[0103] As shown in Figure 1, the precast connection member 60 has a steel connection member 70, a precast concrete section 62, and a cast-in-place concrete section 64. The connection body 72 of the steel connection member 70 is covered by the precast concrete section 62. This ensures the fire resistance of the steel connection member 70 while reducing the effort required for temporary installation and removal of formwork.

[0104] Additionally, a plurality of work holes 74H for accommodating bolts 84 are formed in the upper surface 62U of the precast concrete section 62. Then, by attaching the bolts 84 to the joints 12A of the lag screw bolts 12 provided on the upper end surface 10U of the lower wooden column 10 via each work hole 74H and the through-holes 82 of the lower base plate 80, the steel connection member 70 can be joined to the lag screw bolts 12.

[0105] In this way, in this embodiment, the fire resistance of the steel connection component 70 can be ensured while improving workability.

[0106] Additionally, a plurality of hollow members 74 are embedded in the precast concrete section 62, and are connected to the plurality of through holes 82 in the lower base plate 80. These hollow members 74 form work holes 74H in the upper surface 62U of the precast concrete section 62.

[0107] By embedding a plurality of hollow members 74 in the precast concrete section 62 in this manner, a plurality of working holes 74H can be easily formed in the precast concrete section 62.

[0108] Furthermore, as shown in Figure 7, the upper base plate 90 of the steel connection member 70 has a plurality of through holes 92 that face the plurality of working holes 74H in the precast concrete section 62. An operating rod 102 of a tool 100 for operating the bolts 84 can be inserted from these through holes 92 into the working holes 74H in the precast concrete section 62. This further improves workability.

[0109] Furthermore, a bolt 94 is inserted into the through hole 92 of the upper base plate 90 to join the upper base plate 90 to the lag screw bolt 22 of the upper wooden column 20. That is, in this embodiment, the through hole 92 of the upper base plate 90 for the bolt 94 also serves as a work hole for inserting a tool 100 into the work hole 74H of the precast concrete section 62. Therefore, in this embodiment, cross-sectional loss of the upper base plate 90 can be reduced compared to when a work hole for the tool 100 is formed in the upper base plate 90 separately from the through hole 92.

[0110] (Variation) Next, a modification of the above embodiment will be described.

[0111] In the above embodiment, the fixing member is the lag screw bolt 12. However, the fixing member is not limited to the lag screw bolt 12, and may be, for example, an adhesive anchor or the like.

[0112] In addition, in the above embodiment, the fixing member is the lag screw bolt 12, and the connecting device is the bolt 94. However, the fixing member and connecting device are not limited to the lag screw bolt 12 and the bolt 94. For example, the fixing member may be a bolt member, and the connecting device may be a nut member.

[0113] Specifically, the male threaded portion of the bolt member protruding from the upper end surface 10U of the lower wooden column 10 may be passed through the through hole 82 of the lower base plate 80, and the nut member may be tightened onto the male threaded portion through the work hole 74H, thereby joining the lower base plate 80 to the upper end surface 10U of the lower wooden column 10.

[0114] In the above embodiment, the upper wooden column 20 is joined to the upper base plate 90 of the precast connection member 60 by the lag screw bolt 22 and the bolt 94. However, the joining structure between the precast connection member 60 and the upper wooden column 20 is not limited to the lag screw bolt 22 and the bolt 94, and may also be, for example, the above-mentioned adhesive anchor, or a bolt and nut member.

[0115] In addition, the joint structure between the precast joint member 60 and the upper wooden column 20 may be a steel plate insertion drift pin joint, in which a steel plate protruding from the upper base plate 90 is inserted into a slit formed on the lower end surface of the upper wooden column 20, and the steel plate and the upper wooden column are joined with multiple drift pins.

[0116] Furthermore, for example, in cases where the through holes 92 in the upper base plate 90 are not required, such as in steel plate insertion drift pin joints, the cast-in-place concrete portion 64 of the precast connection member 60 may be a precast concrete portion.

[0117] In the above embodiment, the upper wooden column 20 is joined to the precast connection member 60. However, for example, the upper wooden column 20 does not have to be joined to the precast connection member 60. In other words, the upper base plate 90 can be provided to the precast connection member 60 as needed and can be omitted as appropriate.

[0118] In the above embodiment, the precast connection member 60 is provided with the cast-in-place concrete portion 64. However, as described above, the cast-in-place concrete portion 64 may be provided in the precast connection member 60 as needed, and the cast-in-place concrete portion 64 may also be a precast concrete portion.

[0119] In the above embodiment, the fire-resistant covering portion is a hardened concrete (precast concrete). However, the fire-resistant covering portion is not limited to a hardened concrete, and may be a hardened material such as mortar, grout, or a self-leveling material applied in a factory, a construction site, or the like.

[0120] In the above embodiment, the beams are steel beams 40. However, the beams are not limited to steel beams 40, and may be wooden beams, reinforced concrete beams, steel-reinforced concrete beams, or the like.

[0121] 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]

[0122] 10 Lower wooden pillar (wooden pillar) 10U top end 12 Lag screw bolt (fixing member) 20 Upper wooden pillar (column) 60 Precast joint members 62 Precast concrete section (fireproof covering section) 62U top 70 Steel joint members 74 Hollow members 74H working hole 80 Lower base plate 82 Through hole 84 Bolts (connectors) 90 Upper base plate 92 Through hole

Claims

1. a wooden pole having a fixing member provided on an upper end surface; a precast joint member having a steel joint member that is placed on the upper end surface of the wooden column and joined to the fixing member by a jointing tool, and a fire-resistant covering portion that has a working hole on its upper surface to accommodate the jointing tool and covers the steel joint member; A wooden column and joint member joining structure.

2. The steel connection member is A lower base plate having a through hole in which the fixing member is arranged in a plan view and placed on the upper end surface of the wooden pole; a hollow member that is embedded in the fire-resistant covering portion, is connected to the through hole of the lower base plate, and forms the working hole; having The wooden column-joint member joining structure according to claim 1.

3. The steel connection member has a through hole facing the work hole and an upper base plate disposed on the upper surface of the fire-resistant covering portion. The wooden column-joint member joining structure according to claim 1 or 2.

4. an installation process in which a steel connection member covered with a fire-resistant covering portion of a precast connection member is placed on the upper end surface of a wooden column, and a fixing member provided on the upper end surface of the wooden column is placed in a work hole on the upper surface of the fire-resistant covering portion in a plan view; a joining process in which a connector is attached to the fixing member through the work hole from above the upper surface of the fire-resistant covering portion, and the steel connection member is joined to the fixing member; A construction method for precast joint members comprising:

5. A steel joint member is placed on the upper end surface of the wooden pole and joined to the fixing member provided on the upper end surface by a jointing tool; a fire-resistant covering portion that has an operation hole on an upper surface to accommodate the connector and covers the steel connection member; A precast connection member comprising:

Images