Mouthpiece structure

Abstract

To increase a permissible vertical load for a wooden beam joint.SOLUTION: A joint structure 102 includes a lower pillar 15B, a steel member 200 having a penetrating portion 202 provided at an upper end portion 15BC of the lower pillar 15B and penetrating in the lateral direction, an upper pillar 15A having a lower end portion 15AC supported by the steel member 200, and a first wooden beam 100 passed through a penetrating portion 202.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a joint structure.

Background Art

[0002] Patent Document 1 discloses a technique related to a column-beam joint structure and a column-beam framework in a glued laminated timber structure that forms a ramen structure from columns and beams of glued laminated timber.

[0003] Patent Document 2 discloses a technique related to a wooden beam joint structure and a wooden beam joining method that can secure the necessary strength at this joint portion with a simple configuration when joining a wooden beam to a column or a beam.

[0004] Patent Document 3 discloses a technique related to a column-beam joint structure in which a wooden column member and a wooden beam member are joined.

[0005] Patent Document 4 discloses a technique related to a column-beam joint structure between a wooden column and a wooden beam.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0007] When the end of a wooden beam is pinned to the joint, the bending stress cannot be borne at the beam end, so the stress becomes that of a simple beam, and the tensile stress is only processed at the lower end of the beam member. Therefore, for example, the maximum stress becomes larger and the span becomes smaller compared to a beam fixed at both ends.

[0008] In order to bear the bending stress at the end of a wooden beam, if the beam is made to win at the joint and a column is placed on the beam, the bending stress can be borne at the beam end. However, since the fiber direction of the wooden beam is horizontal, the allowable vertical load of the joint composed of the wooden beam is small. Therefore, for example, it becomes necessary to reduce the bearing pressure of the column, and there is a possibility that the cross-section of the column becomes excessive.

[0009] In view of the above facts, an object of the present invention is to reduce the cross-section of the column at the joint where the wooden beam wins.

Means for Solving the Problem

[0010] A first aspect is a joint structure including a lower column, a steel member provided at the upper end of the lower column and having a through portion formed therethrough in the horizontal direction, an upper column supported at the lower end by the steel member, and a wooden beam passed through the through portion.

[0011] In the joint structure of the first aspect, the lower end of the upper column is supported by the steel member provided at the upper end of the lower column. The wooden beam is passed through the through portion of the steel member. Therefore, the axial force of the upper column is transmitted to the lower column through the steel member and is not transmitted or hardly transmitted through the wooden beam. In this way, since the steel member bears the axial force of the column in the joint, there is no need to reduce the bearing pressure of the column. Therefore, in the joint where the wooden beam wins, the cross-section of the column can be reduced compared to the case where only the wooden beam transmits the axial force of the column.

[0012] A second aspect is the joint structure according to the first aspect, wherein the wooden beam is a cantilever beam on one side with the steel member interposed therebetween.

[0013] In the joint part structure of the second aspect, the wooden beam has a cantilever beam on one side with a steel member sandwiched therebetween. Therefore, for example, it is possible to form a projecting part without a column at the corner of a building using a wooden beam.

[0014] The third aspect is the joint part structure of the second aspect, in which the wooden beam has a Gerber beam on the other side with the steel member sandwiched therebetween. That is.

[0015] In the joint part structure of the third aspect, a Gerber beam is provided on the other side with a steel member sandwiched therebetween. Therefore, the vertical load acting on the wooden beam is reduced.

Effect of the Invention

[0016] According to the present invention, it is possible to reduce the cross-sectional area of the column of the joint part where the wooden beam is superior.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0018] <Embodiment> A joint structure of one embodiment of the present invention and a building to which this joint structure is applied will be described. Here, two orthogonal horizontal directions are defined as the X direction and the Y direction, which are indicated by arrow X and arrow Y respectively. Also, the vertical direction orthogonal to the X direction and the Y direction is defined as the Z direction, which is indicated by arrow Z.

[0019] [Structure] First, the structure of the building of this embodiment will be described.

[0020] As shown in FIG. 7, the building 10 has a column-beam framework 12 composed of wooden columns 15, a first wooden beam 100, a second wooden beam (not shown), and a third wooden beam 30. The wooden columns 15, the first wooden beam 100, the second wooden beam (not shown), and the third wooden beam 30 in this embodiment are composed of the fire-resistant laminated timber 50, 51 shown in FIG. 6.

[0021] The fire-resistant laminated timber 50, 51 shown in FIG. 6 is configured to have a load support portion 52 that supports a load, and a fire-resistant coating layer 70 provided around the load support portion 52. Further, the fire-resistant coating layer 70 is composed of a burnout layer 54 in which a mortar bar 60 is embedded and a charring layer 56.

[0022] The load support portion 52 is provided at the central portion of the fire-resistant laminated timber 50, 51. The burnout layer 54 is provided outside the load support portion 52 so as to surround the load support portion 52, and the charring layer 56 is provided outside the burnout layer 54 so as to surround the burnout layer 54.

[0023] Note that the fire-resistant laminated timber 51 used for the first wooden beam 100, the second wooden beam (not shown), and the third wooden beam 30 has the same configuration as the fire-resistant laminated timber 50 used for the wooden column 15, except that the fire-resistant coating layer 70 composed of the charring layer 56 and the burnout layer 54 is not provided on the upper side.

[0024] And in such fire-resistant laminated woods 50 and 51 with a three-layer structure, during a fire, the outer char layer 56 burns and carbonizes to form a carbonized layer, thereby exerting a heat insulation effect, and the mortar bars 60 that make up the charred layer 54 stop burning while absorbing heat, so that the load support part 52 that supports the load in the central part is protected from the fire.

[0025] Note that the main fiber direction of the wood that constitutes the load support part 52 of the fire-resistant laminated woods 50 and 51 is along the axial direction. That is, the main fiber direction of the wood that constitutes the load support part 52 of the wooden column 15 is along the vertical direction, and the main fiber direction of the wood that constitutes the load support part 52 of the first wooden beam 100, the second wooden beam (not shown), and the third wooden beam 30 is along the horizontal direction.

[0026] As shown in FIG. 7, the joint structure 102 of the present embodiment includes an upper column 15A and a lower column 15B obtained by dividing the wooden column 15, a steel member 200 (also refer to FIGS. 1 to 3) provided between the upper column 15A and the lower column 15B and constituting the joint part 104, and a first wooden beam 100 passing through the steel member 200. The joint part 104 is a beam-over joint part through which the first wooden beam 100 passes between the upper column 15A and the lower column 15B (also refer to FIGS. 1 to 3).

[0027] One side in the X direction of the first wooden beam 100 sandwiching the joint part 104 is a cantilever beam, that is, a projecting beam 106 that projects from the joint part 104. Also, the other side in the X direction of the first wooden beam 100 sandwiching the joint part 104 is a Gerber beam 130 joined by pins. Note that in the present embodiment, as shown in FIG. 7(A), a third wooden beam 30 along the Y direction is joined by pins to the joint part 104 (also refer to FIG. 1).

[0028] The beam end 100A of the jumping beam 106 that jumps out from the left end opening 104 in FIG. 7 is pin - joined to one beam end of a second wooden beam (not shown) provided along the Y direction. In this embodiment, the other beam end (not shown) of the second wooden beam is pin - joined to a steel column (not shown), but it is not limited to this. For example, the second wooden beam may also be a jumping beam that jumps out from the opening.

[0029] At the corner part 14 of the building 10, which is the joint part between the beam end 100A of the first wooden beam 100 at the left end in FIG. 7 and the beam end of the second wooden beam (not shown), there is a jumping - out part 16 where no column is provided.

[0030] As described above, the other beam end 100B of the first wooden beam 100 is pin - joined to the beam end 100A of the adjacent first wooden beam 100 on the right, forming a Gerber beam 130 (see also FIG. 8(A)). The pin - joint part is indicated by reference numeral 132.

[0031] Here, the pin - joint between the beam end 100A and the beam end 100B of the first wooden beam 100 will be described with reference to FIG. 5. Note that the joint configuration in FIG. 5 is an example and is not limited to this.

[0032] As shown in FIG. 5, the beam joint member 500 for joining the beam end 100A and the beam end 100B has a structure including a rectangular joint plate 510 arranged with the beam width direction (Y direction) as the plate thickness direction, and an upper plate 520 provided at half of the upper end part 510A of the joint plate 510 and arranged with the beam forming direction (Z direction) as the plate thickness direction. Also, a plurality of through - holes 512A, 512B penetrating in the plate thickness direction are formed in the joint plate 510.

[0033] In the load - supporting parts 52 of the beam end 100A and the beam end 100B, slits 505A, 505B into which the joint plate 510 of the beam joint member 500 is inserted are respectively formed. Also, at the upper end part of the load - supporting part 52 of the beam end 100A, a concave seat - carved part 530 in which the upper plate 520 of the beam joint member 500 fits is formed.

[0034] Also, at the beam end portions 100A and 100B, joining holes 532A and 532B that penetrate in the beam width direction are respectively drilled at positions corresponding to the through holes 512A and 512B of the joining plate 510 of the beam joining member 500.

[0035] Then, by press-fitting the drift pins 700 into the through holes 512A, 512B and the joining holes 532A, 532B, the beam end portion 100A and the beam end portion 100B are joined.

[0036] As shown in FIGS. 1, 2, and 9, the steel member 200 is configured to have a bottom portion 210 and a main body portion 220. Further, in the steel member 200 of the present embodiment, a gusset plate 150 extending in the Y direction is joined across the bottom portion 210 and the main body portion 220.

[0037] The bottom portion 210 is configured to have a column portion 212 made of an H-shaped steel and a bottom plate 214 joined to the lower end portion of the column portion 212. A lower insertion plate 216 with the X direction as the plate thickness direction is joined to the bottom plate 214.

[0038] The main body portion 220 is configured to have two main body plates 222 (also refer to FIG. 3) arranged at intervals in the Y direction, a top plate 230, and an intermediate plate 232. The intermediate plate 232 is joined to the lower end portions of the two main body plates 222. Further, the intermediate plate 232 is joined to the upper end portion of the column portion 212 of the bottom portion 210.

[0039] As shown in FIGS. 3 and 9, ribs 224 protruding in the Y direction are respectively formed on the two main body plates 222. In the present embodiment, the ribs 224 are provided at a plurality of positions, in this embodiment, two positions, at intervals in the X direction.

[0040] As shown in FIGS. 1, 2, and 9, a connecting portion 226 is joined to the outer side portion in the Y direction at the upper end portion of the main body plate 222. The top plate plate 230 is fastened to the connecting portion 226 with bolts and nuts. Further, an upper insertion plate 228 is joined to the top plate plate 230 with the X direction as the plate thickness direction.

[0041] In the steel member 200 shown in FIGS. 1, 3, and 9, a cylindrical portion penetrating in the X direction surrounded by the two main body plates 222, the intermediate plate 232, and the top plate plate 230 is the through portion 202.

[0042] As shown in FIG. 9, the lower part of the bottom 210 of the steel member 200 is fitted into the recess 17 formed in the upper end portion 15BC of the lower column 15B. Then, as shown in FIGS. 1, 2, and 9, the lower insertion plate 216 of the steel member 200 is inserted into the slit formed in the load support portion 52 of the upper end portion 15BC of the lower column 15B. Through holes are formed in the lower insertion plate 216, and joining holes are formed in the upper end portion 15BC of the lower column 15B. The drift pin 180 is press-fitted into these through holes and joining holes, whereby the upper end portion 15BC of the lower column 15B and the steel member 200 are joined.

[0043] Similarly, the upper insertion plate 228 of the steel member 200 is inserted into the slit formed in the load support portion 52 of the lower end portion 15AC (see FIGS. 1 and 2) of the upper column 15A. Through holes are formed in the upper insertion plate 228, and joining holes are formed in the lower end portion 15AC (see FIGS. 1 and 2) of the upper column 15A. The drift pin 180 is press-fitted into these through holes and joining holes, whereby the lower end portion 15AC of the upper column 15A and the steel member 200 are joined.

[0044] As shown in FIGS. 1 and 3, a gusset plate 150 (see also FIG. 9) of a steel member 200 is inserted into a slit formed in a load support portion 52 at a beam end portion 31 of a third wooden beam 30. A through hole is formed in the gusset plate 150, and a joining hole is formed in the beam end portion 31 of the third wooden beam 30. By press-fitting a drift pin 180 into these through holes and joining holes, the beam end portion 31 of the third wooden beam 30 and the steel member 200 are joined together.

[0045] Also, as shown in FIGS. 1 and 3, in the first wooden beam 100, in the central portion, in this embodiment, the central portion 110 of the load support portion 52 is passed through a through portion 202 of the steel member 200. Explaining from another perspective, as shown in FIG. 3, recesses 120 are formed on both sides of the first wooden beam 100 in the Y direction, the space between these recesses 120 is the central portion 110, and a main body plate 222 is disposed in the recesses 120.

[0046] As shown in FIGS. 1 and 3, through holes are formed in the main body plate 222 of the steel member 200, and joining holes are formed in the central portion 110 of the first wooden beam 100 (see also FIG. 9). All-thread bolts 190 are inserted through these through holes and joining holes and fastened.

[0047] In this way, the joint portion 104 has a beam-over joint portion structure 102 in which the first wooden beam 100 is passed between the upper column 15A and the lower column 15B.

[0048] As shown in FIGS. 1 and 2, a reinforced concrete slab 90 is provided on the first wooden beam 100 and the third wooden beam 30. In this embodiment, the first wooden beam 100 is located above the third wooden beam 30. Therefore, a step is formed in the slab 90.

[0049] Also, as shown in FIG. 1, an outer peripheral portion 92 made of reinforced concrete is formed on the outer side in the Y direction of the joint portion 104 (the non-joined side of the third wooden beam 30).

[0050] Here, the lengths of the aforementioned drift pins 180 and 700 in this embodiment are the same as or approximately the same as the beam width or column width. However, the lengths of the drift pins 180 and 700B may be made such that they do not extend into the combustion layer 56, and a wooden plug or the like (not shown) may be inserted to fill the hole and block it.

[0051] (Construction method of the joint part 104) Next, an example of the construction method of the joint part 104 will be described.

[0052] As shown in FIG. 4, the lower insertion plate 216 of the steel member 200 is inserted into the slit at the upper end portion 15BC of the lower column 15B, and the drift pin 180 is press-fitted. Note that the top plate 230 of the steel member 200 has been removed (see also FIG. 9).

[0053] The central portion 110 of the first wooden beam 100 is inserted into the through portion 202 of the steel member 200 from above, and the top plate 230 is bolted to the connecting portion 226 (see also FIG. 9).

[0054] As shown in FIG. 1, the upper insertion plate 228 of the steel member 200 is inserted into the slit at the lower end portion 15AC of the upper column 15A, and the drift pin 180 is press-fitted.

[0055] [Function and effect] Next, the function and effect of this embodiment will be described.

[0056] In the joint part structure 102, the lower end portion 15AC of the upper column 15A is supported by the steel member 200 provided at the upper end portion 15BC of the lower column 15B. Also, the central portion 110 of the first wooden beam 100 passes through the through portion 202 of the steel member 200. Therefore, the axial force of the upper column 15A is transmitted to the lower column 15B via the steel member 200 and is not transmitted or hardly transmitted via the first wooden beam 100. Thus, since the steel member 200 bears the axial force of the wooden column 15 in the joint part 104, even in the case of a joint part 104 with a wooden beam dominant, the cross-section of the wooden column 15 can be made smaller compared to the case where only the wooden beam bears the axial force of the wooden column 15.

[0057] Here, a joint structure of a comparative example in which the steel member 200 is not provided and the first wooden beam 100 transmits an axial force at the joint will be described.

[0058] The main fiber direction of the wood constituting the load support portion 52 of the wooden column 15 is along the vertical direction, and the main fiber direction of the wood constituting the load support portion 52 of the first wooden beam 100 is along the horizontal direction. Therefore, due to the relationship of the fiber direction of the wood, if the cross-sectional area is the same, the allowable vertical load of the wooden column 15 is greater than that of the first wooden beam 100. Therefore, it is necessary to reduce the surface pressure of the wooden column 15, and it is necessary to make the horizontal cross-section of the load support portion 52 of the wooden column 15 larger than necessary.

[0059] On the other hand, in the joint structure 102 of the present embodiment, as described above, the axial force of the upper column 15A is transmitted to the lower column 15B via the steel member 200 and is not transmitted or hardly transmitted via the first wooden beam 100. Therefore, the allowable vertical load of the joint portion 104 is increased. Therefore, it is not necessary to reduce the surface pressure of the wooden column 15, and the horizontal cross-section of the load support portion 52 of the wooden column 15 can be made the size necessary for bearing the axial force.

[0060] In addition, for the first wooden beam 100, a cantilever beam in which the central portion 110 passing through the steel member 200 of the joint portion 104 bears the bending stress is possible. Therefore, the beam end portion 100A of the first wooden beam 100 that jumps out from the joint portion 104 and the beam end portion of a second wooden beam (not shown) arranged orthogonally to the first wooden beam 100 can be joined to form a protruding portion 16 without a column at the corner portion 14 of the building 10.

[0061] In addition, for the first wooden beam 100, one side in the X direction sandwiching the joint portion 104 becomes a protruding beam 106 that jumps out from the joint portion 104, and the other side in the X direction becomes a Gerber beam 130 that is pin-jointed. Therefore, the span can be increased as compared with the case where both ends of the wooden beam are pin-jointed to columns.

[0062] Here, FIG. 8(A) is a stress diagram schematically showing the bending stress acting on the first wooden beam 100 of the present embodiment. Further, FIG. 8(B) is a stress diagram schematically showing the bending stress acting on the wooden beam 101 of the comparative example whose both ends are pinned to the wooden columns 15.

[0063] The bending stress M1 acting on the central portion 110 passing through the steel member 200 in the first wooden beam 100 of the present embodiment shown in FIG. 8(A) and the bending stress M2 acting on the central portion between the columns are M1 = WL 2 / 12 M2 = WL 2 / 24 That is. Also, the bending stress M3 acting on the central portion between the columns of the wooden beam 101 of the comparative example in FIG. 8(B) is M3 = WL 2 / 8 That is. Note that W is the vertical load acting on the beam, and L is the length between the columns.

[0064] As can be seen by comparing M1 and M3, the maximum stress acting on the beam is smaller in the first wooden beam 100 of the present embodiment than in the wooden beam 101 of the comparative example.

[0065] Also, as can be seen by comparing M2 and M3, the maximum stress acting between the columns of the beam is smaller in the first wooden beam 100 of the present embodiment than in the wooden beam 101 of the comparative example.

[0066] Therefore, if the beam cross-sections of both are the same, the first wooden beam 100 of the present embodiment can have a larger span than the wooden beam 101 of the comparative example.

[0067] <Others> Note that the present invention is not limited to the above embodiment.

[0068] For example, in the above embodiment, the wooden column 15, the first wooden beam 100, the second wooden beam (not shown), and the third wooden beam 30 were fire-resistant laminated woods 50 and 51 having the structure shown in FIG. 6, but the present invention is not limited thereto. Fire-resistant wood other than the structure shown in FIG. 6 may be used. Also, wooden columns and beams other than fire-resistant wood may be used. Note that the wooden column 15, the second wooden beam (not shown), and the third wooden beam 30 may be columns or beams made of, for example, steel frames or reinforced concrete, in addition to wood.

[0069] Further, for example, the structure of the steel member 200 described in the above embodiment is an example and is not limited thereto. The steel member may be provided at the upper end of the lower column to support the upper end of the upper column, and may be formed with a through portion that penetrates in the lateral direction and through which the wooden beam passes.

[0070] Furthermore, the present invention can be implemented in various modes without departing from the gist of the present invention.

Explanation of reference numerals

[0071] 10 Building 15 Wooden column 15A Upper column 15AC Lower end portion 15B Lower column 15BC Upper end portion 16 Protrusion portion 100 First wooden beam 100A Beam end portion 100B Beam end portion 102 Doorway structure 104 Doorway 106 Protrusion beam 200 Steel member 202 Through portion

Claims

1. A lower column, a steel member having its lower end joined to the upper end of the lower column, an upper column having its lower end joined to and supported by the upper end of the steel member, a wooden beam passed through a through portion provided between the upper and lower ends of the steel member and penetrating in the lateral direction, and comprising the axial force of the upper column being transmitted to the lower column through the steel member, a joint structure.

2. The wooden beam is a cantilever beam on one side with the steel member interposed therebetween, The joint structure according to Claim 1.

3. The wooden beam is a Gerber beam on the other side with the steel member interposed therebetween, The joint structure according to Claim 2.

4. A gusset plate protruding in a direction orthogonal to the wooden beam in a plan view is provided on the steel member, Another wooden beam along the orthogonal direction is joined to the gusset plate, The joint structure according to any one of Claims 1 to 3.

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