JP4411178B2 - Beam-column connection structure - Google Patents

Description

The present invention relates to a structure for joining a column and a beam in a wooden building, and particularly to a column-beam connection structure in which relative deformation is constrained at the joint between the column and the beam, and a bending moment is transmitted between the two. .

  In a wooden structure that has been widely used, a column and a beam have long been joined by inserting a tenon in which the end of the beam is processed into a tenon provided in the column. Such a connection structure allows deformation between the two and hardly transmits a bending moment. In other words, the shaft assembly that cannot resist the bending moment and is formed of a plurality of columns and a plurality of beams (including members that are installed in the lateral direction such as torso, eaves, and foundations) is deformed. easy. For this reason, braces are arranged in the walls between the columns to resist deformation when a horizontal force is applied during an earthquake or the like.

  Bracing is generally provided at a plurality of positions and is required in two directions in which the directions of inclination are opposite. Therefore, in a conventional wooden building, it is necessary to secure a wall body for providing braces, which may hinder the setting of the opening and the use of the indoor space. Under such circumstances, there has been proposed a so-called rigid connection between the column and the beam, that is, a connection that causes the transmission of a bending moment, and a ramen structure as the shaft assembly.

  In the connection structure described in Patent Document 1, fittings are attached to the end face of a beam and the side face of a column, and these fittings are joined to each other. The fitting is fixed to a steel bar having an external thread on the outer peripheral surface, or a steel bar screwed in the horizontal direction from the side surface of the column, screwed in the axial direction from the end face of the beam. Both fittings have protrusions with an I-shaped cross section, and are arranged so as to abut each other, abut against the mounting iron plate over both protrusions, and are coupled with bolts. .

In the connection structure described in Patent Document 2, a gusset plate is attached to a beam so as to cover the entire end face, and the gusset plate is fastened to the column using a lag screw bolt that is screwed horizontally from the side of the column. . The gusset plate is fixed to the beam using a number of drift pins.
Patent Publication No. 2798239 Japanese Patent Publication No. 2653414

However, the conventionally known connection structure as described above has the following unsolved problems.
Since all the connection structures described in the above-mentioned patent documents are joined by abutting the end face of the beam against the side surface of the column, a bending moment and a large shear force act on the joint surface. In order to resist this large shearing force, the connection structures of Patent Document 1 and Patent Document 2 use a large metal joining member that covers the entire area of the beam end face. When such a large joining member is used, the structure of the joining portion becomes complicated as shown in Patent Document 1, or the joining member is fixed to the wooden member as shown in Patent Document 2. Many pins are required. And the amount of work and cost of processing will increase.
Further, in the connection structure described in Patent Document 1, since a large fitting is used for the joint portion, the heat insulating property is lowered at this portion, which causes condensation and the like.

  The present invention has been made in view of the above circumstances, and its purpose is a structure for joining a wooden column and a beam so that a bending moment can be reliably transmitted, and a simple structure. Thus, it is to provide a column beam connection structure that can simplify the work at the site of joining.

In order to solve the above-mentioned problem, the invention according to claim 1 is a connection structure of a wooden beam laid in a lateral direction and a wooden column joined with an end face abutting against the upper or lower surface of the beam. And
A plurality of notches are provided at the end of the column, and a screw member is screwed in the axial direction of the column from within the notch, and a screw member screwed into the column is connected to the beam. A screw member is screwed in a vertical direction at an opposing position, a bolt is screwed into a screw hole provided in an axial direction from an end surface of the screw member screwed into the column and a screw member screwed into the beam, and the notch The joint fitting disposed inside is coupled to both the screw member screwed into the column by the bolt and the screw member screwed into the beam, and both screw members are connected via the joint fitting, The joining metal fittings are two horizontal plates that are brought into contact with each of a screw member screwed into the column and a screw member screwed into the beam, facing each other. And a side plate portion that joins the edges of these horizontal plate portions to each other, one side portion of the joint fitting is opened, and the opposite side of the opened portion has a uniform planar shape in the vertical direction. A column beam connection structure having a convex curved surface is provided.
In addition, the said beam contains the member generally constructed | installed in horizontal directions, such as a trunk difference, eaves, and a foundation.

  In this connection structure, the upper end surface or lower end surface of the column is brought into contact with the lower surface or upper surface of the beam, and the axial force acting on the column, that is, the vertical force, is a contact portion of the column end surface with the beam. To the beam. Moreover, the screw member screwed into the column at a plurality of positions and the screw member screwed into the beam are connected via a joint fitting, and a tensile force and a compressive force are transmitted. Therefore, the bending moment is transmitted at the joint between the column and the beam, and the wooden column and beam are integrated into a structure that can resist vertical loads and horizontal forces during earthquakes. Become.

  Further, the force transmitted through the screw member and the joint fitting is dispersed and acts on the wooden pillar or beam because the screw member is engaged with the wooden member in a wide range, and is locally large. Generation of stress is suppressed.

  On the other hand, when joining the column and beam using the above connection structure, the joint fitting is temporarily fixed in the notch of the column, and both are arranged so that the end surface of the column and the upper or lower surface of the beam are in contact with each other. The joint fitting and the beam are coupled by screwing a bolt into a screw hole of a screw member screwed into the beam. The joint fitting is temporarily fixed in the notch of the column with a bolt screwed into a screw hole provided on the end face of the screw member, and can be rotated around the bolt in the notch. At this time, the side opposite to the side where the opening of the joint fitting is provided is a convex curved surface, so even if the notch dimension of the column is small, the joint fitting is a vertical surface in the notch. It can be rotated without hitting. Therefore, the side opening can be directed in a direction that facilitates the work, and a tool can be inserted into the joint fitting from the opening to tighten the bolt.

  The invention according to claim 2 is the column-beam connection structure according to claim 1, wherein the column has a cross-sectional dimension in the axial direction of the beam larger than a cross-sectional dimension in the width direction of the beam, The notches are provided at both ends in the long side direction of the end surface at the lower end or the upper end of the column, and the center portion in the long side direction at the end surface of the column is in contact with the upper surface or the lower surface of the beam. .

  In this connection structure, the cross section of the column is a flat rectangle, and both ends in the long side direction are connected by the screw member and the joint bracket, so it is effective against bending moments acting in the long side direction. It becomes a structure that can resist. In addition, since the end face of the column is in contact with the upper or lower surface of the beam at the central portion in the long side direction and the joining bracket is provided only at both ends, the axial force and bending moment of the column can be achieved with a simple structure. It becomes the structure which transmits effectively.

  The invention according to claim 3 is the column beam connection structure according to claim 2, wherein one of the two horizontal plate portions of the joint fitting has a circular hole larger than a bolt hole provided in the other horizontal plate portion. A circular plate is engaged with the circular hole from the inside of the joint fitting so as to be rotatable in the circumferential direction, and a long hole having an axial line in the radial direction from the center is used as a bolt insertion hole in the circular plate. It shall be provided.

  The circular plate locked to the circular hole of the joint fitting has a long hole, and the bolt inserted into the long hole can be adjusted in position in the axial direction of the long hole, that is, in the radial direction of the circular hole. it can. Since the circular plate can be rotated in the circumferential direction while being locked in the circular hole, the bolt can be adjusted in a wide range within the circular hole by adjusting the position in the radial direction and the position in the rotational direction. Can be adjusted. Therefore, when trying to join the joint fitting to the screw member screwed into the beam, even if there is an error in the screwing position of the screw member, it is possible to easily join by adjusting the position within the circular hole. It becomes.

    The invention according to claim 4 is the column beam connection structure according to claim 1, claim 2 or claim 3, wherein a hard heat insulating material molded so as to cover the joint fitting is provided in the notch. It shall be fitted.

In this connection structure, the joint fitting in the notch provided on the pillar is covered with a heat insulating material, so that condensation can occur in the notch even when the interior is heated and the temperature rises. Can be prevented. In particular, since the metal fitting is formed of metal, condensation tends to occur on the surface, but it can be effectively prevented by attaching a heat insulating material. Further, the heat insulating material becomes a fireproof coating, and safety in a fire can be ensured.
On the other hand, at the time of construction, by using a hard material as the heat insulating material, it can be installed so as to be fitted into the notch, and the work efficiency can be improved.
It should be noted that the hard heat insulating material is not limited as long as it can be molded in accordance with the notch shape dimensions and can maintain the shape dimensions, and a synthetic resin foam material, foam mortar, or the like can be used. .

  As described above, in the column beam connection structure according to the present invention, the column end surface can be brought into contact with and joined to the upper or lower surface of the beam, and a bending moment can be reliably transmitted between them. . And, at the time of construction, it is possible to rotate the temporarily fixed joint metal fitting in the notch provided in the column and insert a tool or the like from a direction with good workability to easily fix the joint metal fitting. it can. Moreover, by installing a heat insulating material in the notch, it is possible to prevent condensation at the joint and to ensure fire resistance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing a structural frame of a wooden building in which the column beam connection structure of the present invention is suitably used.
In this structural housing, the lower layer portion constituting the first floor and the upper layer portion constituting the second floor are each formed by combining a plurality of ramen frame structures, and the entire structural housing is formed by laminating them. . Each of the ramen frames has a so-called beam winning structure in which wooden beams 2 and 4 are placed on and joined to the wooden columns 1 and 3. The columns 1 and 3 and the columns 1 and 3 constituting the ramen frame, respectively. The beams 2 and 4 are flat members having a large cross-sectional dimension in a direction parallel to the elevational plane including these axes, and a small cross-sectional dimension in a direction perpendicular thereto. Therefore, the joint portion of each frame structure has a structure that resists bending in one direction.

  These frames are joined so that the directions are perpendicular to each other on a plane, that is, the beams 2-1, 2-2, 4-1 and 4-2 of a plurality of frames are perpendicular to each other. Has been. Thus, a plurality of rigid frame structures that resist horizontal forces in different directions are combined with each other to form a structural frame that can resist horizontal forces in all directions. The upper column 3 is erected on the beam 2 of the lower frame structure, and the bending moment is transmitted also at these joints.

FIG. 2 is an exploded perspective view showing an embodiment of the invention according to the present application, which is a connection structure between a lower beam 2 and an upper column 3 used in the frame structure shown in FIG. FIG. 3 is a cross-sectional view of the same connection structure, showing a cross section parallel to the axis of the rigid frame structure.
In this connection structure, notches 3 b are provided at both ends in the long side direction on the lower end surface of the pillar 3, and the central portion 3 a is in contact with the upper surface of the beam 2. And two screw members 11 and 11 are screwed in from the notch 3b of the pillar 3 in the axial direction of this pillar. On the other hand, two screw members 12, 12 are screwed in the vertical direction at corresponding positions of the beam 2, and the screw member 11 screwed into the column 3 and the screw member 12 screwed into the beam face each other. Are coupled by a bolt 41 via a joint fitting 31. Thereby, the pillar 3 and the beam 2 are connected via the screw members 11 and 12 and the joint fitting 31.

  As shown in the plan view and the front view of FIG. 4, the screw member 11 is provided with a spiral projecting portion 11 a on the side surface of a rod-shaped steel member, and screw holes in the axial direction from the end surface at both ends. 11b is provided. As shown in FIG. 2, each screw member 11 is formed by providing a vertical hole in the beam 2 or the column 3 and further screwing in after cutting a spiral groove.

  As shown in FIG. 5, the joint fitting 31 includes two horizontal plate portions 31a facing each other and a side plate portion 31b that couples the edges of the horizontal plate portions 31a to each other. Bolt holes 31c are respectively provided. The two horizontal plate portions 31 a are in contact with the lower end surface of the screw member 11 screwed into the column 3 and the upper end surface of the screw member 12 screwed into the beam 2. Then, the bolt 41 inserted through the bolt hole 31c is screwed into a screw hole provided on the end face of the screw member, and the screw members 11 and 12 and the joint fitting 31 are joined. Therefore, the screw member 11 screwed into the column 3 and the screw member 12 screwed into the beam 2 are connected via the joint fitting 31.

Further, as shown in FIG. 5, one side portion of the joining metal fitting 31 is opened, and the opposite side of the opened portion is a cylindrical curved surface having an axis in the vertical direction. That is, the cross section is uniform in the vertical direction, and the back side of the planar shape is arcuate.
The dimensions of the joint fitting 31 are such that the horizontal width and depth are smaller than the width of the pillar 3, and the height is substantially equal to the vertical dimension of the notch 3 b provided at the end of the pillar 3. Yes.

Next, the process of joining the column 3 and the beam 2 will be described.
The pillar 3 is provided with a notch 3b having a predetermined dimension at an end portion at a processing stage in a factory or the like. Then, a hole is cut in the axial direction from the notch, and the screw member 11 is screwed. A bolt 41 is screwed into a screw hole 11b provided at an end portion of the screw member 11, and the joining fitting 31 is temporarily fixed in the notch. Further, the screw member 12 is screwed into a predetermined position by a work in a factory or the like.

  At the site where the column 3 and the beam 2 are assembled, the beam 2 is installed at a predetermined position, and the column 3 is built thereon. The column 3 has an end surface of the screw member 12 in which the end surface of the screw member 11 screwed in the axial direction is screwed into the beam 2 through the notch 3b with the central portion 3a in the long side direction of the end surface contacting the upper surface of the beam 2. It arranges so that it may face. Then, the bolt 41 is inserted into the bolt hole 31 c of the horizontal plate portion 31 a from the open portion of the side surface of the joint fitting 31 and screwed into the screw hole at the end of the screw member 12 screwed into the beam 2. At this time, by slightly loosening the bolt 41 temporarily fixed to the column 3, the joint fitting 31 can be rotated around the bolt 41. The back surface side of the open portion provided on the side of the joint fitting is a cylindrical curved surface and does not have an apex portion, so that it can freely rotate without hitting the vertical surface in the pillar notch 3b. Therefore, it is possible to efficiently perform the work of tightening the bolt 41 by inserting the tool from the open portion with the joining metal fitting 31 in the direction in which the work becomes easy. Thereby, the joining metal fitting 31 is firmly joined to both the screw member 11 screwed into the column 3 and the screw member 12 screwed into the beam 2.

  Instead of the bolt 41, a headless bolt (long screw bolt) in which a male screw is formed over the entire length and a nut can be used. When such a headless bolt and nut are used, the headless bolt is screwed into the screw hole of the screw member for a predetermined length, and the joint fitting 3 temporarily fixed to the column is attached thereto. Then, the nut can be screwed into the headless bolt from the open part of the side portion of the joint fitting 31 and tightened.

  When the joining metal fitting 31 and the screw members 11 and 12 are joined, the heat insulating material 51 molded in the notch provided in the pillar 3 is inserted as shown in FIG. The heat insulating material 51 is made of a synthetic resin foaming agent, foamed mortar, foamed glass, or the like, and has a U-shaped planar shape. Therefore, the fitting 31 can be accommodated inside and can be fitted so that the outer surface is continuous with the side surface of the column 3.

  When the column 3 and the beam 2 are joined as described above, the central portion 3a of the column 3 is pressed against the upper surface of the beam 2, and the screw member 11 is joined at both ends in the long side direction of the column cross section. It connects with the screw member 12 screwed in 2 beams via 31. Thereby, the vertical load acting on the column 3 is supported by the beam 2, and the tensile force and the compressive force generated by the bending moment are resisted by the screw members 11, 12 and the joint fitting 31. Therefore, even if a bending moment acts on the joint between the column 3 and the beam 2, a large deformation does not occur, and a rigid frame structure having great rigidity is formed.

  Moreover, by inserting the heat insulating material 51 into the notch of the pillar 3, heat insulation between the inside and outside of the building is improved, and condensation within the notch, in particular, condensation on the joint fitting 31 is effectively prevented. Can do. Furthermore, the joining metal fitting 31 is an important structural member for maintaining the frame structure, and the heat insulating material 51 acts as a fireproof coating for the joining metal fitting 31 and ensures the fire resistance performance of the structural housing.

FIG. 7 is a plan view, a bottom view, and a cross-sectional view showing another example of a joint fitting that can be used in place of the joint fitting 31 used in the column beam connection structure shown in FIGS. 2 and 3.
This joining metal fitting 32 has two horizontal plate parts 32a and a side part 32b for connecting these parts as shown in FIG. 5, and a part of the side part 32b is opened. One side of the plate portion 32a is provided with a circular hole 32d having a diameter larger than that of the bolt hole 32c provided on the other side. A circular plate 33 is engaged with the circular hole 32d from the inside, and a part of the circular plate 33 is fitted into the circular hole 32d so that it can rotate in the circumferential direction. The circular plate 33 is provided with a long hole 33a having an axial line in the radial direction from the center. The bolt 41 is inserted into the long hole 33a from the inside of the joint metal 32, and the joint metal 32 is screwed into the beam. The screw member 12 is coupled.

  The operation of screwing the screw members 11 and 12 into the pillar 3 or the beam 2 is performed with high accuracy in a factory or the like, but wood is not a completely homogeneous material, and because it expands and contracts in a dry state, the screw members 11 and 12 are screwed. An error may occur in the position. Even if there is an error in the position of the screw members 11 and 12, when the above-mentioned joining metal fitting 32 is used, the position of the bolt 41 can be adjusted in the radial direction of the circular hole 32d in the long hole 33a, and the circular plate By rotating 33, the position of the bolt 41 can be adjusted in any direction. Therefore, when assembling the pillar 3 and the beam 2 at the site, the position of the bolt 41 can be adjusted and construction can be easily performed. Moreover, the point which can perform the fastening operation | work of the volt | bolt 41 from the direction in which the joining metal fitting 32 is rotated before fastening and it becomes easy to construct is the same as the joining metal fitting shown in FIG.

  The embodiment described above is a connection structure between the beam 2 in the lower layer portion and the column 3 in the upper layer portion supported thereon, but the column 1 in the lower layer portion and the beam 2 supported thereon are provided. A similar configuration can be adopted for the joint portion by turning upside down. After the lower column 1 and the beam 2 are joined by the above structure, when the upper column 3 is erected at the same position, the screw member 12 screwed into the beam 2 is connected to the upper layer column 3 and the beam 2. It can also be used in common for bonding. Thereby, the lower pillar 1 and the upper pillar 3 are coupled by the screw member 12 and the joint fitting 31, and both pillars have rigidity close to that of the through pillar.

It is a schematic perspective view which shows the structural frame of the wooden building in which the column beam connection structure of this invention is used suitably. It is a disassembled perspective view which shows the column beam connection structure which is one Embodiment of the invention which concerns on this application. It is sectional drawing which shows the column beam connection structure which is one Embodiment of the invention which concerns on this application, and shows a cross section parallel to the axis line of a rigid frame structure. It is the top view and front view of a screw member which are used with the column beam connection structure shown in FIG.2 and FIG.3. FIG. 4 is a perspective view of a connection fitting used in the column beam connection structure shown in FIGS. 2 and 3. It is a schematic perspective view which shows the heat insulating material inserted in the circumference | surroundings of a joining metal fitting by the column beam connection structure shown in FIG.2 and FIG.3. FIG. 4 is a plan view, a bottom view, and a cross-sectional view of another joint fitting that can be used instead of the joint fitting of the column beam connection structure shown in FIGS. 2 and 3.

Explanation of symbols

1,3: pillar, 3a: center part of pillar end face, 3b: notch,
2, 4: Beam, 2a: Vertical hole,
11, 12: Screw member 31: Joining metal fitting, 31a: Horizontal plate portion, 31b: Side plate portion, 31c: Bolt hole,
32: Joining metal fitting, 32a: Horizontal plate portion, 32b: Side plate portion, 32c: Bolt hole, 32d: Circular hole,
33: Circular plate, 33a: Long hole,
41: bolt,
51: Insulation

Claims (4)

It is a connection structure between a wooden beam laid in the lateral direction and a wooden column joined with the end face abutting against the upper or lower surface of this beam,
A plurality of notches are provided at the end of the pillar,
A screw member is screwed in the axial direction of the pillar from the notch,
In the beam, a screw member is screwed in a vertical direction at a position facing the screw member screwed into the column,
A bolt is screwed into a screw hole provided in the axial direction from an end surface of the screw member screwed into the column and the screw member screwed into the beam,
The joint fitting arranged in the notch is coupled to both the screw member screwed into the column by the bolt and the screw member screwed into the beam, and both screw members are connected via the joint fitting. And
The joint fitting includes two horizontal plate portions that are brought into contact with each of a screw member screwed into the column and a screw member screwed into the beam so as to face each other, and edges of these horizontal plate portions are connected to each other. A side plate portion to be joined,
A column beam connection structure characterized in that one side portion of the joint fitting is open, and the opposite side of the open portion is a convex curved surface having a uniform planar shape in the vertical direction. The column has a larger cross-sectional dimension in the axial direction of the beam than the cross-sectional dimension in the width direction of the beam,
The notches are provided at both ends in the long side direction of the end surface at the lower end or the upper end of the column,
The column beam connection structure according to claim 1, wherein a central portion of the end surface of the column in a long side direction is in contact with an upper surface or a lower surface of the beam. One of the two horizontal plate portions of the joint metal fitting is provided with a circular hole larger than the bolt hole provided in the other horizontal plate portion,
A circular plate is locked to the circular hole from the inside of the joint fitting so as to be able to rotate in the circumferential direction,
The column beam connection structure according to claim 2, wherein the circular plate is provided with a long hole having an axis line in a radial direction from the center as a bolt insertion hole. The column beam connection structure according to claim 1, 2 or 3, wherein a hard heat insulating material molded so as to cover the joining metal fitting is fitted in the notch. .

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